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Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu
|
From: |
Blue Swirl |
|
Subject: |
Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu |
|
Date: |
Fri, 27 Jul 2012 19:22:25 +0000 |
On Wed, Jul 25, 2012 at 5:03 PM, Alex Williamson
<address@hidden> wrote:
> This adds PCI based device assignment to Qemu using the Linux VFIO
> userspace driver interface. After setting up VFIO device access,
> devices can be added to Qemu guests using the vfio-pci device
> option:
>
> -device vfio-pci,host=1:10.1,id=net0
>
> or for hotplug:
>
> (qemu) device_add vfio-pci,host=1:10.1,id=net0
> (qemu) device_del net0
>
> This patch adds support for assigning host physical PCI devices,
> with or without KVM[1] for x86 hosts and guests. Support for
> POWER hosts and guests is working and expected to follow shortly.
> Other platforms wishing to make use of this need to do the following:
> - Add a VFIO IOMMU interface to the host kernel driver or make us of
> an existing one if possible (pre-req: linux host IOMMU support)
> - Add corresponding mapping calls for your IOMMU in qemu, see
> x86 and POWER for examples.
>
> And if you care about PCI legacy interrupts:
> - Add support for EOI notification (TBD for everyone)
>
> While not requiring KVM support, VFIO based device assignment still
> supports acceleration through KVM. MMIO regions with sufficient
> alignment are mapped directly into the guest addres space and
> platforms supporting direct interrupt injection through eventfds can
> bypass Qemu userspace. This support is included and automatically
> enabled when KVM and KVM irqchip is enabled. These allow VFIO
> based assignment to meet the same performance levels as KVM based
> assignment in the qemu-kvm tree.
>
> Sending this as an RFC for review as we're waiting on VFIO to be
> accepted into the Linux kernel. I'm hoping it will be accepted
> for Linux v3.6. Pending Linux VFIO acceptance, I'd like to get
> this support in for 1.2 and work on generic Qemu EOI infrastructure
> in-tree. This patch is based on current qemu.git merged with MST's
> latest pull request. Thanks,
>
> Alex
>
> [1] The proposed level IRQFD/EOIFD KVM interface is currently
> required to support legacy PCI INTx interrupts. Qemu support for
> this is included here. Qemu infrastructure for EOI notification
> is not yet in place to do this without KVM. Device which rely only
> on MSI/MSIX work in unaccelerated Qemu.
>
> Signed-off-by: Alex Williamson <address@hidden>
> ---
>
> MAINTAINERS | 5
> configure | 12
> hw/i386/Makefile.objs | 1
> hw/vfio_pci.c | 2030
> ++++++++++++++++++++++++++++++++++++++++++++
> hw/vfio_pci.h | 100 ++
> linux-headers/linux/kvm.h | 21
> linux-headers/linux/vfio.h | 445 ++++++++++
> 7 files changed, 2614 insertions(+)
> create mode 100644 hw/vfio_pci.c
> create mode 100644 hw/vfio_pci.h
> create mode 100644 linux-headers/linux/vfio.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 30ed56d..68406a3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -460,6 +460,11 @@ M: Gerd Hoffmann <address@hidden>
> S: Maintained
> F: hw/usb*
>
> +VFIO
> +M: Alex Williamson <address@hidden>
> +S: Supported
> +F: hw/vfio*
> +
> vhost
> M: Michael S. Tsirkin <address@hidden>
> S: Supported
> diff --git a/configure b/configure
> index cef0a71..62d921e 100755
> --- a/configure
> +++ b/configure
> @@ -143,6 +143,7 @@ attr=""
> libattr=""
> xfs=""
>
> +vfio_pci="no"
> vhost_net="no"
> kvm="no"
> gprof="no"
> @@ -489,6 +490,7 @@ Haiku)
> usb="linux"
> kvm="yes"
> vhost_net="yes"
> + vfio_pci="yes"
> if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
> audio_possible_drivers="$audio_possible_drivers fmod"
> fi
> @@ -824,6 +826,10 @@ for opt do
> ;;
> --disable-guest-agent) guest_agent="no"
> ;;
> + --disable-vfio-pci) vfio_pci="no"
> + ;;
> + --enable-vfio-pci) vfio_pci="yes"
> + ;;
> *) echo "ERROR: unknown option $opt"; show_help="yes"
> ;;
> esac
> @@ -1110,6 +1116,8 @@ echo " --disable-guest-agent disable building of
> the QEMU Guest Agent"
> echo " --enable-guest-agent enable building of the QEMU Guest Agent"
> echo " --with-coroutine=BACKEND coroutine backend. Supported options:"
> echo " gthread, ucontext, sigaltstack, windows"
> +echo " --disable-vfio-pci disable vfio pci device assignement support"
> +echo " --enable-vfio-pci enable vfio pci device assignment support"
> echo ""
> echo "NOTE: The object files are built at the place where configure is
> launched"
> exit 1
> @@ -3070,6 +3078,7 @@ echo "OpenGL support $opengl"
> echo "libiscsi support $libiscsi"
> echo "build guest agent $guest_agent"
> echo "coroutine backend $coroutine_backend"
> +echo "VFIO PCI support $vfio_pci"
>
> if test "$sdl_too_old" = "yes"; then
> echo "-> Your SDL version is too old - please upgrade to have SDL support"
> @@ -3747,6 +3756,9 @@ case "$target_arch2" in
> *)
> echo "CONFIG_NO_XEN=y" >> $config_target_mak
> esac
> +if test "$vfio_pci" = "yes" -a "$target_softmmu" = "yes" ; then
> + echo "CONFIG_VFIO_PCI=y" >> $config_target_mak
> +fi
> case "$target_arch2" in
> i386|x86_64|ppcemb|ppc|ppc64|s390x)
> # Make sure the target and host cpus are compatible
> diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
> index 8c764bb..a2783ef 100644
> --- a/hw/i386/Makefile.objs
> +++ b/hw/i386/Makefile.objs
> @@ -11,5 +11,6 @@ obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o
> xen_pt_msi.o
> obj-y += kvm/
> obj-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
> +obj-$(CONFIG_VFIO_PCI) += vfio_pci.o
>
> obj-y := $(addprefix ../,$(obj-y))
> diff --git a/hw/vfio_pci.c b/hw/vfio_pci.c
> new file mode 100644
> index 0000000..e9ae421
> --- /dev/null
> +++ b/hw/vfio_pci.c
> @@ -0,0 +1,2030 @@
> +/*
> + * vfio based device assignment support
> + *
> + * Copyright Red Hat, Inc. 2012
> + *
> + * Authors:
> + * Alex Williamson <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2. See
GPLv2only?
> + * the COPYING file in the top-level directory.
> + *
> + * Based on qemu-kvm device-assignment:
> + * Adapted for KVM by Qumranet.
> + * Copyright (c) 2007, Neocleus, Alex Novik (address@hidden)
> + * Copyright (c) 2007, Neocleus, Guy Zana (address@hidden)
> + * Copyright (C) 2008, Qumranet, Amit Shah (address@hidden)
> + * Copyright (C) 2008, Red Hat, Amit Shah (address@hidden)
> + * Copyright (C) 2008, IBM, Muli Ben-Yehuda (address@hidden)
> + */
> +
> +#include <dirent.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +#include <sys/io.h>
> +#include <sys/ioctl.h>
> +#include <sys/mman.h>
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <linux/vfio.h>
> +
> +#include "config.h"
> +#include "event_notifier.h"
> +#include "exec-memory.h"
> +#include "hw.h"
> +#include "kvm.h"
> +#include "memory.h"
> +#include "monitor.h"
> +#include "msi.h"
> +#include "msix.h"
> +#include "notify.h"
> +#include "pc.h"
> +#include "qemu-error.h"
> +#include "qemu-timer.h"
> +#include "range.h"
> +#include "vfio_pci.h"
> +
> +//#define DEBUG_VFIO
> +#ifdef DEBUG_VFIO
> +#define DPRINTF(fmt, ...) \
> + do { fprintf(stderr, "vfio: " fmt, ## __VA_ARGS__); } while (0)
> +#else
> +#define DPRINTF(fmt, ...) \
> + do { } while (0)
> +#endif
> +
> +#define MSIX_CAP_LENGTH 12
> +
> +static QLIST_HEAD(, VFIOContainer)
> + container_list = QLIST_HEAD_INITIALIZER(container_list);
> +
> +static QLIST_HEAD(, VFIOGroup)
> + group_list = QLIST_HEAD_INITIALIZER(group_list);
> +
> +static void vfio_disable_interrupts(VFIODevice *vdev);
> +static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int
> len);
> +
> +/*
> + * Common VFIO interrupt disable
> + */
> +static void vfio_disable_irqindex(VFIODevice *vdev, int index)
> +{
> + struct vfio_irq_set irq_set = {
> + .argsz = sizeof(irq_set),
> + .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
> + .index = index,
> + .start = 0,
> + .count = 0,
> + };
> +
> + ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
> +
> + vdev->interrupt = INT_NONE;
> +}
> +
> +/*
> + * INTx
> + */
> +static inline void vfio_unmask_intx(VFIODevice *vdev)
'inline' may be premature optimization.
> +{
> + struct vfio_irq_set irq_set = {
> + .argsz = sizeof(irq_set),
> + .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
> + .index = VFIO_PCI_INTX_IRQ_INDEX,
> + .start = 0,
> + .count = 1,
> + };
> +
> + ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
> +}
> +
> +static inline void vfio_mask_intx(VFIODevice *vdev)
> +{
> + struct vfio_irq_set irq_set = {
> + .argsz = sizeof(irq_set),
> + .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
> + .index = VFIO_PCI_INTX_IRQ_INDEX,
> + .start = 0,
> + .count = 1,
> + };
> +
> + ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
> +}
> +
> +static void vfio_intx_interrupt(void *opaque)
> +{
> + VFIODevice *vdev = opaque;
> +
> + if (!event_notifier_test_and_clear(&vdev->intx.interrupt)) {
> + return;
> + }
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) Pin %c\n", __FUNCTION__,
> vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function,
> + 'A' + vdev->intx.pin);
> +
> + vdev->intx.pending = true;
> + qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 1);
> +}
> +
> +static void vfio_eoi(VFIODevice *vdev)
> +{
> + if (!vdev->intx.pending) {
> + return;
> + }
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) EOI\n", __FUNCTION__, vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function);
> +
> + vdev->intx.pending = false;
> + qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
> + vfio_unmask_intx(vdev);
> +}
> +
> +struct vfio_irq_set_fd {
> + struct vfio_irq_set irq_set;
> + int32_t fd;
> +} QEMU_PACKED;
Why is this structure not defined in kernel headers?
> +
> +static void vfio_enable_intx_kvm(VFIODevice *vdev)
> +{
> +#ifdef CONFIG_KVM
These shouldn't be needed. The device will not be useful without KVM,
so the file shouldn't be compiled for non-KVM case at all.
> + struct vfio_irq_set_fd irq_set_fd = {
> + .irq_set = {
> + .argsz = sizeof(irq_set_fd),
> + .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_UNMASK,
> + .index = VFIO_PCI_INTX_IRQ_INDEX,
> + .start = 0,
> + .count = 1,
> + },
> + };
> + struct kvm_irqfd irqfd = {
> + .gsi = vdev->intx.route.irq,
> + .flags = KVM_IRQFD_FLAG_LEVEL,
> + };
> + struct kvm_eoifd eoifd = {
> + .flags = KVM_EOIFD_FLAG_LEVEL_IRQFD,
> + };
> + int key;
> +
> + if (vdev->intx.kvm_accel || !kvm_irqchip_in_kernel() ||
> + vdev->intx.route.mode == PCI_INTX_DISABLED ||
> + !kvm_check_extension(kvm_state, KVM_CAP_IRQFD_LEVEL) ||
> + !kvm_check_extension(kvm_state, KVM_CAP_EOIFD_LEVEL_IRQFD)) {
> + return;
> + }
> +
> + /*
> + * We've already got an eventfd for interrupt signals from VFIO
> + * into Qemu. Plumb it into an IRQFD.
> + */
> + irqfd.fd = event_notifier_get_fd(&vdev->intx.interrupt);
> +
> + /*
> + * Get to a known state, not listening for interrupts, hardware
> + * masked, Qemu IRQ de-asserted.
> + */
> + qemu_set_fd_handler(irqfd.fd, NULL, NULL, vdev);
> + /* TBD - Disable qemu eoi notifier */
> + vfio_mask_intx(vdev);
> + vdev->intx.pending = false;
> + qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
> +
> + /*
> + * Create a new eventfd to connect unmask signals from KVM EOIFD
> + * directly into VFIO.
> + */
> + if (event_notifier_init(&vdev->intx.unmask, 0)) {
> + error_report("vfio: Error: event_notifier_init failed eoi\n");
> + goto fail;
> + }
> +
> + /* Tell both KVM EOIFD and VFIO about this eventfd */
> + eoifd.fd = irq_set_fd.fd = event_notifier_get_fd(&vdev->intx.unmask);
> +
> + /* IRQFD first sets up the level interrupt */
> + key = kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd);
> + if (key < 0) {
> + error_report("vfio: Error: Failed to setup INTx irqfd: %s\n",
> + strerror(errno));
> + goto fail;
> + }
> +
> + /* Giving us a key that let's us configure the EOIFD */
> + eoifd.key = key;
> + if (kvm_vm_ioctl(kvm_state, KVM_EOIFD, &eoifd)) {
> + error_report("vfio: Error: Failed to setup INTx EOI: %s\n",
> + strerror(errno));
> + goto fail_eoifd;
> + }
> +
> + /* Finally configure the irqfd-like vfio mechanism for unmasks */
> + if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd)) {
> + error_report("vfio: Error: Failed to setup INTx unmask fd: %s\n",
> + strerror(errno));
> + goto fail_vfio;
> + }
> +
> + /* Let'em rip */
> + vfio_unmask_intx(vdev);
> +
> + vdev->intx.kvm_accel = true;
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) KVM INTx accel enabled\n",
> + __FUNCTION__, vdev->host.domain, vdev->host.bus,
> + vdev->host.slot, vdev->host.function);
> +
> + return;
> +
> +fail_vfio:
> + eoifd.flags |= KVM_EOIFD_FLAG_DEASSIGN;
> + kvm_vm_ioctl(kvm_state, KVM_EOIFD, &eoifd);
> +fail_eoifd:
> + irqfd.flags = KVM_IRQFD_FLAG_DEASSIGN;
> + kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd);
> +fail:
> + /* TBD - Enable qemu eoi notifier */
> + qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev);
> + vfio_unmask_intx(vdev);
> +#endif
> +}
> +
> +static void vfio_disable_intx_kvm(VFIODevice *vdev)
> +{
> +#ifdef CONFIG_KVM
> + struct kvm_irqfd irqfd = {
> + .gsi = vdev->intx.route.irq,
> + .flags = KVM_IRQFD_FLAG_DEASSIGN,
> + };
> +
> + if (!vdev->intx.kvm_accel) {
> + return;
> + }
> +
> + /*
> + * Get to a known state, hardware masked, Qemu ready to accept new
> + * interrupts, Qemu IRQ de-asserted.
> + */
> + vfio_mask_intx(vdev);
> + vdev->intx.pending = false;
> + qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
> +
> + /*
> + * Both ends of the unmask eventfd watch for POLLHUP, so this kills
> + * the eoifd and the vfio unmask handler in one shot.
> + */
> + event_notifier_cleanup(&vdev->intx.unmask);
> +
> + /*
> + * Tell the kernel to stop listening for interrupt events.
> + */
> + irqfd.fd = event_notifier_get_fd(&vdev->intx.interrupt);
> + if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) {
> + error_report("vfio: Error: Failed to disable INTx irqfd: %s\n",
> + strerror(errno));
> + }
> +
> + /*
> + * Qemu starts listening for interrupt events.
> + */
> + qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev);
> +
> + /* TBD - Enable qemu eoi notifier */
> +
> + vdev->intx.kvm_accel = false;
> +
> + /*
> + * If we've missed an event, let it re-fire through qemu.
> + */
> + vfio_unmask_intx(vdev);
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) KVM INTx accel disabled\n",
> + __FUNCTION__, vdev->host.domain, vdev->host.bus,
> + vdev->host.slot, vdev->host.function);
> +#endif
> +}
> +
> +static void vfio_update_irq(PCIDevice *pdev)
> +{
> + VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> + PCIINTxRoute route;
> +
> + if (vdev->interrupt != INT_INTx) {
> + return;
> + }
> +
> + route = pci_device_route_intx_to_irq(&vdev->pdev, vdev->intx.pin);
> + if (!memcmp(&route, &vdev->intx.route, sizeof(route))) {
> + return; /* Nothing changed */
> + }
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) IRQ moved %d -> %d\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, vdev->intx.route.irq, route.irq);
> +
> + vfio_disable_intx_kvm(vdev);
> + /* TBD - Disable qemu eoi notifier */
> +
> + vdev->intx.route = route;
> +
> + if (route.mode == PCI_INTX_DISABLED) {
> + return;
> + }
> +
> + /* TBD - Enable qemu eoi notifier */
> + vfio_enable_intx_kvm(vdev);
> +
> + /* Re-enable the interrupt in cased we missed an EOI */
> + vfio_eoi(vdev);
> +}
> +
> +static int vfio_enable_intx(VFIODevice *vdev)
> +{
> + struct vfio_irq_set_fd irq_set_fd = {
> + .irq_set = {
> + .argsz = sizeof(irq_set_fd),
> + .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER,
> + .index = VFIO_PCI_INTX_IRQ_INDEX,
> + .start = 0,
> + .count = 1,
> + },
> + };
> + uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1);
> +
> + if (!pin) {
> + return 0;
> + }
> +
> + vfio_disable_interrupts(vdev);
> +
> + vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */
> + vdev->intx.route = pci_device_route_intx_to_irq(&vdev->pdev,
> + vdev->intx.pin);
> + /* TBD - Enable qemu eoi notifier */
> +
> + if (event_notifier_init(&vdev->intx.interrupt, 0)) {
> + error_report("vfio: Error: event_notifier_init failed\n");
> + return -1;
> + }
> +
> + irq_set_fd.fd = event_notifier_get_fd(&vdev->intx.interrupt);
> + qemu_set_fd_handler(irq_set_fd.fd, vfio_intx_interrupt, NULL, vdev);
> +
> + if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd)) {
> + error_report("vfio: Error: Failed to setup INTx fd: %s\n",
> + strerror(errno));
> + return -1;
> + }
> +
> + vfio_enable_intx_kvm(vdev);
> +
> + vdev->interrupt = INT_INTx;
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x)\n", __FUNCTION__, vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function);
> +
> + return 0;
> +}
> +
> +static void vfio_disable_intx(VFIODevice *vdev)
> +{
> + int fd;
> +
> + vfio_disable_intx_kvm(vdev);
> + vfio_disable_irqindex(vdev, VFIO_PCI_INTX_IRQ_INDEX);
> +
> + /* TBD - Disable qemu eoi notifier */
> +
> + fd = event_notifier_get_fd(&vdev->intx.interrupt);
> + qemu_set_fd_handler(fd, NULL, NULL, vdev);
> + event_notifier_cleanup(&vdev->intx.interrupt);
> +
> + vdev->interrupt = INT_NONE;
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x)\n", __FUNCTION__, vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function);
> +}
> +
> +/*
> + * MSI/X
> + */
> +static void vfio_msi_interrupt(void *opaque)
> +{
> + MSIVector *vec = opaque;
> + VFIODevice *vdev = vec->vdev;
> +
> + if (!event_notifier_test_and_clear(&vec->interrupt)) {
> + return;
> + }
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) vector %d\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, vec->vector);
> +
> + if (vdev->interrupt == INT_MSIX) {
> + msix_notify(&vdev->pdev, vec->vector);
> + } else if (vdev->interrupt == INT_MSI) {
> + msi_notify(&vdev->pdev, vec->vector);
> + } else {
> + error_report("vfio: MSI interrupt receieved, but not enabled?\n");
> + }
> +}
> +
> +static int vfio_enable_vectors(VFIODevice *vdev, bool msix)
> +{
> + struct vfio_irq_set *irq_set;
> + int ret = 0, i, argsz;
> + int32_t *fds;
> +
> + argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds));
> +
> + irq_set = g_malloc0(argsz);
> + irq_set->argsz = argsz;
> + irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
> + irq_set->index = msix ? VFIO_PCI_MSIX_IRQ_INDEX : VFIO_PCI_MSI_IRQ_INDEX;
> + irq_set->start = 0;
> + irq_set->count = vdev->nr_vectors;
> + fds = (int32_t *)&irq_set->data;
> +
> + for (i = 0; i < vdev->nr_vectors; i++) {
> + if (!vdev->msi_vectors[i].use) {
> + fds[i] = -1;
> + continue;
> + }
> +
> + fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
> + }
> +
> + ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
> +
> + g_free(irq_set);
> +
> + if (!ret) {
> + vdev->interrupt = msix ? INT_MSIX : INT_MSI;
> + }
> +
> + return ret;
> +}
> +
> +static int vfio_msix_vector_use(PCIDevice *pdev,
> + unsigned int vector, MSIMessage msg)
> +{
> + VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> + int ret, fd;
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) vector %d used\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, vector);
> +
> + if (vdev->interrupt != INT_MSIX) {
> + vfio_disable_interrupts(vdev);
> + }
> +
> + if (!vdev->msi_vectors) {
> + vdev->msi_vectors = g_malloc0(vdev->msix->entries *
> sizeof(MSIVector));
> + }
> +
> + vdev->msi_vectors[vector].vdev = vdev;
> + vdev->msi_vectors[vector].vector = vector;
> + vdev->msi_vectors[vector].use = true;
> +
> + msix_vector_use(pdev, vector);
> +
> + if (event_notifier_init(&vdev->msi_vectors[vector].interrupt, 0)) {
> + error_report("vfio: Error: event_notifier_init failed\n");
> + }
> +
> + fd = event_notifier_get_fd(&vdev->msi_vectors[vector].interrupt);
> +
> + /*
> + * Attempt to enable route through KVM irqchip,
> + * default to userspace handling if unavailable.
> + */
> + vdev->msi_vectors[vector].virq = kvm_irqchip_add_msi_route(kvm_state,
> msg);
> + if (vdev->msi_vectors[vector].virq < 0 ||
> + kvm_irqchip_add_irqfd(kvm_state, fd,
> + vdev->msi_vectors[vector].virq) < 0) {
> + qemu_set_fd_handler(fd, vfio_msi_interrupt, NULL,
> + &vdev->msi_vectors[vector]);
> + }
> +
> + /*
> + * We don't want to have the host allocate all possible MSI vectors
> + * for a device if they're not in use, so we shutdown and incrementally
> + * increase them as needed.
> + */
> + if (vdev->nr_vectors < vector + 1) {
> + int i;
> +
> + vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX);
> + vdev->nr_vectors = vector + 1;
> + ret = vfio_enable_vectors(vdev, true);
> + if (ret) {
> + error_report("vfio: failed to enable vectors, %d\n", ret);
> + }
> +
> + /* We don't know if we've missed interrupts in the interim... */
> + for (i = 0; i < vdev->msix->entries; i++) {
> + if (vdev->msi_vectors[i].use) {
> + msix_notify(&vdev->pdev, i);
> + }
> + }
> + } else {
> + struct vfio_irq_set_fd irq_set_fd = {
> + .irq_set = {
> + .argsz = sizeof(irq_set_fd),
> + .flags = VFIO_IRQ_SET_DATA_EVENTFD |
> + VFIO_IRQ_SET_ACTION_TRIGGER,
> + .index = VFIO_PCI_MSIX_IRQ_INDEX,
> + .start = vector,
> + .count = 1,
> + },
> + .fd = fd,
> + };
> + ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd);
> + if (ret) {
> + error_report("vfio: failed to modify vector, %d\n", ret);
> + }
> + msix_notify(&vdev->pdev, vector);
> + }
> +
> + return 0;
> +}
> +
> +static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int vector)
> +{
> + VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> + struct vfio_irq_set_fd irq_set_fd = {
> + .irq_set = {
> + .argsz = sizeof(irq_set_fd),
> + .flags = VFIO_IRQ_SET_DATA_EVENTFD |
> + VFIO_IRQ_SET_ACTION_TRIGGER,
> + .index = VFIO_PCI_MSIX_IRQ_INDEX,
> + .start = vector,
> + .count = 1,
> + },
> + .fd = -1,
> + };
> + int fd;
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) vector %d released\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, vector);
> +
> + /*
> + * XXX What's the right thing to do here? This turns off the interrupt
> + * completely, but do we really just want to switch the interrupt to
> + * bouncing through userspace and let msix.c drop it? Not sure.
> + */
> + msix_vector_unuse(pdev, vector);
> + ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd);
> +
> + fd = event_notifier_get_fd(&vdev->msi_vectors[vector].interrupt);
> +
> + if (vdev->msi_vectors[vector].virq < 0) {
> + qemu_set_fd_handler(fd, NULL, NULL, NULL);
> + } else {
> + kvm_irqchip_remove_irqfd(kvm_state, fd,
> vdev->msi_vectors[vector].virq);
> + kvm_irqchip_release_virq(kvm_state, vdev->msi_vectors[vector].virq);
> + vdev->msi_vectors[vector].virq = -1;
> + }
> +
> + event_notifier_cleanup(&vdev->msi_vectors[vector].interrupt);
> + vdev->msi_vectors[vector].use = false;
> +}
> +
> +/* XXX This should move to msi.c */
> +static MSIMessage msi_get_msg(PCIDevice *pdev, unsigned int vector)
> +{
> + uint16_t flags = pci_get_word(pdev->config + pdev->msi_cap +
> PCI_MSI_FLAGS);
> + bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
> + MSIMessage msg;
> +
> + if (msi64bit) {
> + msg.address = pci_get_quad(pdev->config +
> + pdev->msi_cap + PCI_MSI_ADDRESS_LO);
> + } else {
> + msg.address = pci_get_long(pdev->config +
> + pdev->msi_cap + PCI_MSI_ADDRESS_LO);
> + }
> +
> + msg.data = pci_get_word(pdev->config + pdev->msi_cap +
> + (msi64bit ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32));
> + msg.data += vector;
> +
> + return msg;
> +}
> +
> +/* So should this */
> +static void msi_set_qsize(PCIDevice *pdev, uint8_t size)
> +{
> + uint8_t *config = pdev->config + pdev->msi_cap;
> + uint16_t flags;
> +
> + flags = pci_get_word(config + PCI_MSI_FLAGS);
> + flags = le16_to_cpu(flags);
> + flags &= ~PCI_MSI_FLAGS_QSIZE;
> + flags |= (size & 0x7) << 4;
> + flags = cpu_to_le16(flags);
> + pci_set_word(config + PCI_MSI_FLAGS, flags);
> +}
> +
> +static void vfio_enable_msi(VFIODevice *vdev)
> +{
> + int ret, i;
> +
> + vfio_disable_interrupts(vdev);
> +
> + vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev);
> +retry:
> + vdev->msi_vectors = g_malloc0(vdev->nr_vectors * sizeof(MSIVector));
> +
> + for (i = 0; i < vdev->nr_vectors; i++) {
> + MSIMessage msg;
> + int fd;
> +
> + vdev->msi_vectors[i].vdev = vdev;
> + vdev->msi_vectors[i].vector = i;
> + vdev->msi_vectors[i].use = true;
> +
> + if (event_notifier_init(&vdev->msi_vectors[i].interrupt, 0)) {
> + error_report("vfio: Error: event_notifier_init failed\n");
> + }
> +
> + fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
> +
> + msg = msi_get_msg(&vdev->pdev, i);
> +
> + /*
> + * Attempt to enable route through KVM irqchip,
> + * default to userspace handling if unavailable.
> + */
> + vdev->msi_vectors[i].virq = kvm_irqchip_add_msi_route(kvm_state,
> msg);
> + if (vdev->msi_vectors[i].virq < 0 ||
> + kvm_irqchip_add_irqfd(kvm_state, fd,
> + vdev->msi_vectors[i].virq) < 0) {
> + qemu_set_fd_handler(fd, vfio_msi_interrupt, NULL,
> + &vdev->msi_vectors[i]);
> + }
> + }
> +
> + ret = vfio_enable_vectors(vdev, false);
> + if (ret) {
> + if (ret < 0) {
> + error_report("vfio: Error: Failed to setup MSI fds: %s\n",
> + strerror(errno));
> + } else if (ret != vdev->nr_vectors) {
> + error_report("vfio: Error: Failed to enable %d "
> + "MSI vectors, retry with %d\n", vdev->nr_vectors,
> ret);
> + }
> +
> + for (i = 0; i < vdev->nr_vectors; i++) {
> + int fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
> + if (vdev->msi_vectors[i].virq >= 0) {
> + kvm_irqchip_remove_irqfd(kvm_state, fd,
> + vdev->msi_vectors[i].virq);
> + kvm_irqchip_release_virq(kvm_state,
> vdev->msi_vectors[i].virq);
> + vdev->msi_vectors[i].virq = -1;
> + } else {
> + qemu_set_fd_handler(fd, NULL, NULL, NULL);
> + }
> + event_notifier_cleanup(&vdev->msi_vectors[i].interrupt);
> + }
> +
> + g_free(vdev->msi_vectors);
> +
> + if (ret > 0 && ret != vdev->nr_vectors) {
> + vdev->nr_vectors = ret;
> + goto retry;
> + }
> + vdev->nr_vectors = 0;
> +
> + return;
> + }
> +
> + msi_set_qsize(&vdev->pdev, vdev->nr_vectors);
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) Enabled %d MSI vectors\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, vdev->nr_vectors);
> +}
> +
> +static void vfio_disable_msi_x(VFIODevice *vdev, bool msix)
> +{
> + int i;
> +
> + vfio_disable_irqindex(vdev, msix ? VFIO_PCI_MSIX_IRQ_INDEX :
> + VFIO_PCI_MSI_IRQ_INDEX);
> +
> + for (i = 0; i < vdev->nr_vectors; i++) {
> + int fd;
> +
> + if (!vdev->msi_vectors[i].use) {
> + continue;
> + }
> +
> + fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
> +
> + if (vdev->msi_vectors[i].virq >= 0) {
> + kvm_irqchip_remove_irqfd(kvm_state, fd,
> vdev->msi_vectors[i].virq);
> + kvm_irqchip_release_virq(kvm_state, vdev->msi_vectors[i].virq);
> + vdev->msi_vectors[i].virq = -1;
> + } else {
> + qemu_set_fd_handler(fd, NULL, NULL, NULL);
> + }
> +
> + if (msix) {
> + msix_vector_unuse(&vdev->pdev, i);
> + }
> +
> + event_notifier_cleanup(&vdev->msi_vectors[i].interrupt);
> + }
> +
> + g_free(vdev->msi_vectors);
> + vdev->msi_vectors = NULL;
> + vdev->nr_vectors = 0;
> +
> + if (!msix) {
> + msi_set_qsize(&vdev->pdev, 0); /* Actually still means 1 vector */
> + }
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x, msi%s)\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, msix ? "x" : "");
> +
> + vfio_enable_intx(vdev);
> +}
> +
> +/*
> + * IO Port/MMIO - Beware of the endians, VFIO is always little endian
> + */
> +static void vfio_bar_write(void *opaque, target_phys_addr_t addr,
> + uint64_t data, unsigned size)
> +{
> + VFIOBAR *bar = opaque;
> + uint8_t buf[8];
> +
> + switch (size) {
> + case 1:
> + *buf = data & 0xff;
> + break;
> + case 2:
> + *(uint16_t *)buf = cpu_to_le16(data);
> + break;
> + case 4:
> + *(uint32_t *)buf = cpu_to_le32(data);
> + break;
> + default:
> + hw_error("vfio: unsupported write size, %d bytes\n", size);
> + }
> +
> + if (pwrite(bar->fd, buf, size, bar->fd_offset + addr) != size) {
> + error_report("%s(,0x%"PRIx64", 0x%"PRIx64", %d) failed: %s\n",
> + __FUNCTION__, addr, data, size, strerror(errno));
> + }
> +
> + DPRINTF("%s(BAR%d+0x%"PRIx64", 0x%"PRIx64", %d)\n",
> + __FUNCTION__, bar->nr, addr, data, size);
> +}
> +
> +static uint64_t vfio_bar_read(void *opaque,
> + target_phys_addr_t addr, unsigned size)
> +{
> + VFIOBAR *bar = opaque;
> + uint8_t buf[8];
> + uint64_t data = 0;
> +
> + if (pread(bar->fd, buf, size, bar->fd_offset + addr) != size) {
> + error_report("%s(,0x%"PRIx64", %d) failed: %s\n",
> + __FUNCTION__, addr, size, strerror(errno));
> + return (uint64_t)-1;
> + }
> +
> + switch (size) {
> + case 1:
> + data = buf[0];
> + break;
> + case 2:
> + data = le16_to_cpu(*(uint16_t *)buf);
> + break;
> + case 4:
> + data = le32_to_cpu(*(uint32_t *)buf);
> + break;
> + default:
> + hw_error("vfio: unsupported read size, %d bytes\n", size);
> + }
> +
> + DPRINTF("%s(BAR%d+0x%"PRIx64", %d) = 0x%"PRIx64"\n",
> + __FUNCTION__, bar->nr, addr, size, data);
> +
> + return data;
> +}
> +
> +static const MemoryRegionOps vfio_bar_ops = {
> + .read = vfio_bar_read,
> + .write = vfio_bar_write,
> + .endianness = DEVICE_LITTLE_ENDIAN,
> +};
> +
> +/*
> + * PCI config space
> + */
> +static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len)
> +{
> + VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> + uint32_t val = 0;
> +
> + /*
> + * We only need Qemu PCI config support for the ROM BAR, the MSI and MSIX
> + * capabilities, and the multifunction bit below. We let VFIO handle
> + * virtualizing everything else. Performance is not a concern here.
> + */
> + if (ranges_overlap(addr, len, PCI_ROM_ADDRESS, 4) ||
> + (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
> + ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) ||
> + (pdev->cap_present & QEMU_PCI_CAP_MSI &&
> + ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size))) {
> +
> + val = pci_default_read_config(pdev, addr, len);
> + } else {
> + if (pread(vdev->fd, &val, len, vdev->config_offset + addr) != len) {
> + error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x) failed: %s\n",
> + __FUNCTION__, vdev->host.domain, vdev->host.bus,
> + vdev->host.slot, vdev->host.function, addr, len,
> + strerror(errno));
> + return -1;
> + }
> + val = le32_to_cpu(val);
> + }
> +
> + /* Multifunction bit is virualized in qemu */
> + if (unlikely(ranges_overlap(addr, len, PCI_HEADER_TYPE, 1))) {
> + uint32_t mask = PCI_HEADER_TYPE_MULTI_FUNCTION;
> +
> + if (len == 4) {
> + mask <<= 16;
> + }
> +
> + if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
> + val |= mask;
> + } else {
> + val &= ~mask;
> + }
> + }
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, addr, len, val);
> +
> + return val;
> +}
> +
> +static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
> + uint32_t val, int len)
> +{
> + VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> + uint32_t val_le = cpu_to_le32(val);
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, 0x%x, len=0x%x)\n", __FUNCTION__,
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, addr, val, len);
> +
> + /* Write everything to VFIO, let it filter out what we can't write */
> + if (pwrite(vdev->fd, &val_le, len, vdev->config_offset + addr) != len) {
> + error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x, 0x%x) failed: %s\n",
> + __FUNCTION__, vdev->host.domain, vdev->host.bus,
> + vdev->host.slot, vdev->host.function, addr, val, len,
> + strerror(errno));
> + }
> +
> + /* Write standard header bits to emulation */
> + if (addr < PCI_CONFIG_HEADER_SIZE) {
> + pci_default_write_config(pdev, addr, val, len);
> + return;
> + }
> +
> + /* MSI/MSI-X Enabling/Disabling */
> + if (pdev->cap_present & QEMU_PCI_CAP_MSI &&
> + ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) {
> + int is_enabled, was_enabled = msi_enabled(pdev);
> +
> + pci_default_write_config(pdev, addr, val, len);
> +
> + is_enabled = msi_enabled(pdev);
> +
> + if (!was_enabled && is_enabled) {
> + vfio_enable_msi(vdev);
> + } else if (was_enabled && !is_enabled) {
> + vfio_disable_msi_x(vdev, false);
> + }
> + }
> +
> + if (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
> + ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) {
> + int is_enabled, was_enabled = msix_enabled(pdev);
> +
> + pci_default_write_config(pdev, addr, val, len);
> +
> + is_enabled = msix_enabled(pdev);
> +
> + if (!was_enabled && is_enabled) {
> + /* vfio_msix_vector_use handles this automatically */
> + } else if (was_enabled && !is_enabled) {
> + vfio_disable_msi_x(vdev, true);
> + }
> + }
> +}
> +
> +/*
> + * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
> + */
> +static int vfio_dma_map(VFIOContainer *container, target_phys_addr_t iova,
> + ram_addr_t size, void* vaddr, bool readonly)
> +{
> + struct vfio_iommu_type1_dma_map map = {
> + .argsz = sizeof(map),
> + .flags = VFIO_DMA_MAP_FLAG_READ,
> + .vaddr = (__u64)vaddr,
> + .iova = iova,
> + .size = size,
> + };
> +
> + if (!readonly) {
> + map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
> + }
> +
> + if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map)) {
> + DPRINTF("VFIO_MAP_DMA: %d\n", -errno);
> + return -errno;
> + }
> +
> + return 0;
> +}
> +
> +static int vfio_dma_unmap(VFIOContainer *container,
> + target_phys_addr_t iova, ram_addr_t size)
> +{
> + struct vfio_iommu_type1_dma_unmap unmap = {
> + .argsz = sizeof(unmap),
> + .flags = 0,
> + .iova = iova,
> + .size = size,
> + };
> +
> + if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
> + DPRINTF("VFIO_UNMAP_DMA: %d\n", -errno);
> + return -errno;
> + }
> +
> + return 0;
> +}
> +
> +static void vfio_listener_dummy1(MemoryListener *listener)
> +{
> + /* We don't do batching (begin/commit) or care about logging */
> +}
> +
> +static void vfio_listener_dummy2(MemoryListener *listener,
> + MemoryRegionSection *section)
> +{
> + /* We don't do logging or care about nops */
> +}
> +
> +static void vfio_listener_dummy3(MemoryListener *listener,
> + MemoryRegionSection *section,
> + bool match_data, uint64_t data,
> + EventNotifier *e)
> +{
> + /* We don't care about eventfds */
> +}
> +
> +static bool vfio_listener_skipped_section(MemoryRegionSection *section)
> +{
> + return (section->address_space != get_system_memory() ||
> + !memory_region_is_ram(section->mr));
> +}
> +
> +static void vfio_listener_region_add(MemoryListener *listener,
> + MemoryRegionSection *section)
> +{
> + VFIOContainer *container = container_of(listener, VFIOContainer,
> + iommu_data.listener);
> + target_phys_addr_t iova, end;
> + void *vaddr;
> + int ret;
> +
> + if (vfio_listener_skipped_section(section)) {
> + DPRINTF("vfio: SKIPPING region_add %016lx - %016lx\n",
> + section->offset_within_address_space,
> + section->offset_within_address_space + section->size - 1);
> + return;
> + }
> +
> + if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK)
> !=
> + (section->offset_within_region & ~TARGET_PAGE_MASK))) {
> + error_report("%s received unaligned region\n", __FUNCTION__);
> + return;
> + }
> +
> + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
> + end = (section->offset_within_address_space + section->size) &
> + TARGET_PAGE_MASK;
> +
> + if (iova >= end) {
> + return;
> + }
> +
> + vaddr = memory_region_get_ram_ptr(section->mr) +
> + section->offset_within_region +
> + (iova - section->offset_within_address_space);
> +
> + DPRINTF("vfio: region_add %016lx - %016lx [%p]\n",
> + iova, end - 1, vaddr);
> +
> + ret = vfio_dma_map(container, iova, end - iova, vaddr,
> section->readonly);
> + if (ret) {
> + error_report("vfio_dma_map(%p, 0x%016lx, 0x%lx, %p) = %d (%s)\n",
> + container, iova, end - iova, vaddr, ret,
> strerror(errno));
> + }
> +}
> +
> +static void vfio_listener_region_del(MemoryListener *listener,
> + MemoryRegionSection *section)
> +{
> + VFIOContainer *container = container_of(listener, VFIOContainer,
> + iommu_data.listener);
> + target_phys_addr_t iova, end;
> + int ret;
> +
> + if (vfio_listener_skipped_section(section)) {
> + DPRINTF("vfio: SKIPPING region_del %016lx - %016lx\n",
> + section->offset_within_address_space,
> + section->offset_within_address_space + section->size - 1);
> + return;
> + }
> +
> + if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK)
> !=
> + (section->offset_within_region & ~TARGET_PAGE_MASK))) {
> + error_report("%s received unaligned region\n", __FUNCTION__);
> + return;
> + }
> +
> + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
> + end = (section->offset_within_address_space + section->size) &
> + TARGET_PAGE_MASK;
> +
> + if (iova >= end) {
> + return;
> + }
> +
> + DPRINTF("vfio: region_del %016lx - %016lx\n", iova, end - 1);
> +
> + ret = vfio_dma_unmap(container, iova, end - iova);
> + if (ret) {
> + error_report("vfio_dma_unmap(%p, 0x%016lx, 0x%lx) = %d (%s)\n",
> + container, iova, end - iova, ret, strerror(errno));
> + }
> +}
> +
> +static void vfio_listener_release(VFIOContainer *container)
> +{
> + memory_listener_unregister(&container->iommu_data.listener);
> +}
> +
> +/*
> + * Interrupt setup
> + */
> +static void vfio_disable_interrupts(VFIODevice *vdev)
> +{
> + switch (vdev->interrupt) {
> + case INT_INTx:
> + vfio_disable_intx(vdev);
> + break;
> + case INT_MSI:
> + vfio_disable_msi_x(vdev, false);
> + break;
> + case INT_MSIX:
> + vfio_disable_msi_x(vdev, true);
I'd add 'break' here, maybe also to default cases earlier. That way if
somebody adds code after this he won't introduce a fall through
accidentally.
> + }
> +}
> +
> +static int vfio_setup_msi(VFIODevice *vdev, int pos)
> +{
> + uint16_t ctrl;
> + bool msi_64bit, msi_maskbit;
> + int ret, entries;
> +
> + if (!msi_supported) {
> + return 0;
> + }
> +
> + if (pread(vdev->fd, &ctrl, sizeof(ctrl),
> + vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
> + return -1;
> + }
> + ctrl = le16_to_cpu(ctrl);
> +
> + msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT);
> + msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT);
> + entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1);
> +
> + DPRINTF("%04x:%02x:%02x.%x PCI MSI CAP @0x%x\n", vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function, pos);
> +
> + ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit);
> + if (ret < 0) {
> + error_report("vfio: msi_init failed\n");
> + return ret;
> + }
> + vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 :
> 0);
> +
> + return 0;
> +}
> +
> +/*
> + * We don't have any control over how pci_add_capability() inserts
> + * capabilities into the chain. In order to setup MSI-X we need a
> + * MemoryRegion for the BAR. In order to setup the BAR and not
> + * attempt to mmap the MSI-X table area, which VFIO won't allow, we
> + * need to first look for where the MSI-X table lives. So we
> + * unfortunately split MSI-X setup across two functions.
> + */
> +static int vfio_early_setup_msix(VFIODevice *vdev)
> +{
> + uint8_t pos;
> + uint16_t ctrl;
> + uint32_t table, pba;
> +
> + pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX);
> + if (!pos) {
> + return 0;
> + }
> +
> + if (pread(vdev->fd, &ctrl, sizeof(ctrl),
> + vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
> + return -1;
> + }
> +
> + if (pread(vdev->fd, &table, sizeof(table),
> + vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) {
> + return -1;
> + }
> +
> + if (pread(vdev->fd, &pba, sizeof(pba),
> + vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) {
> + return -1;
> + }
> +
> + ctrl = le16_to_cpu(ctrl);
> + table = le32_to_cpu(table);
> + pba = le32_to_cpu(pba);
> +
> + vdev->msix = g_malloc0(sizeof(*(vdev->msix)));
> + vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK;
> + vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK;
> + vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK;
> + vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
> + vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
> +
> + DPRINTF("%04x:%02x:%02x.%x "
> + "PCI MSI-X CAP @0x%x, BAR %d, offset 0x%x, entries %d\n",
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function, pos, vdev->msix->table_bar,
> + vdev->msix->table_offset, vdev->msix->entries);
> +
> + return 0;
> +}
> +
> +static int vfio_setup_msix(VFIODevice *vdev, int pos)
> +{
> + int ret;
> +
> + if (!msi_supported) {
> + return 0;
> + }
> +
> + ret = msix_init(&vdev->pdev, vdev->msix->entries,
> + &vdev->bars[vdev->msix->table_bar].mem,
> + vdev->msix->table_bar, vdev->msix->table_offset,
> + &vdev->bars[vdev->msix->pba_bar].mem,
> + vdev->msix->pba_bar, vdev->msix->pba_offset, pos);
> + if (ret < 0) {
> + error_report("vfio: msix_init failed\n");
> + return ret;
> + }
> +
> + ret = msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use,
> + vfio_msix_vector_release);
> + if (ret) {
> + error_report("vfio: msix_set_vector_notifiers failed %d\n", ret);
> + msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem,
> + &vdev->bars[vdev->msix->pba_bar].mem);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void vfio_teardown_msi(VFIODevice *vdev)
> +{
> + msi_uninit(&vdev->pdev);
> +
> + if (vdev->msix) {
> + /* FIXME: Why can't unset just silently do nothing?? */
> + if (vdev->pdev.msix_vector_use_notifier &&
> + vdev->pdev.msix_vector_release_notifier) {
> + msix_unset_vector_notifiers(&vdev->pdev);
> + }
> +
> + msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem,
> + &vdev->bars[vdev->msix->pba_bar].mem);
> + }
> +}
> +
> +/*
> + * Resource setup
> + */
> +static void vfio_unmap_bar(VFIODevice *vdev, int nr)
> +{
> + VFIOBAR *bar = &vdev->bars[nr];
> + uint64_t size;
> +
> + if (!memory_region_size(&bar->mem)) {
> + return;
> + }
> +
> + size = memory_region_size(&bar->mmap_mem);
> + if (size) {
> + memory_region_del_subregion(&bar->mem, &bar->mmap_mem);
> + munmap(bar->mmap, size);
> + }
> +
> + if (vdev->msix && vdev->msix->table_bar == nr) {
> + size = memory_region_size(&vdev->msix->mmap_mem);
> + if (size) {
> + memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem);
> + munmap(vdev->msix->mmap, size);
> + }
> + }
> +
> + memory_region_destroy(&bar->mem);
> +}
> +
> +static int vfio_mmap_bar(VFIOBAR *bar, MemoryRegion *mem, MemoryRegion
> *submem,
> + void **map, size_t size, off_t offset,
> + const char *name)
> +{
> + *map = mmap(NULL, size, PROT_READ | PROT_WRITE,
> + MAP_SHARED, bar->fd, bar->fd_offset + offset);
> + if (*map == MAP_FAILED) {
> + *map = NULL;
> + return -1;
> + }
> +
> + memory_region_init_ram_ptr(submem, name, size, *map);
> + memory_region_add_subregion(mem, offset, submem);
> +
> + return 0;
> +}
> +
> +static void vfio_map_bar(VFIODevice *vdev, int nr, uint8_t type)
> +{
> + VFIOBAR *bar = &vdev->bars[nr];
> + unsigned size = bar->size;
> + char name[64];
> +
> + sprintf(name, "VFIO %04x:%02x:%02x.%x BAR %d", vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function, nr);
snprintf, please.
> +
> + /* A "slow" read/write mapping underlies all BARs */
> + memory_region_init_io(&bar->mem, &vfio_bar_ops, bar, name, size);
> + pci_register_bar(&vdev->pdev, nr, type, &bar->mem);
> +
> + if (type & PCI_BASE_ADDRESS_SPACE_IO) {
> + return; /* IO space is only slow, don't expect high perf here */
> + }
> +
> + if (size & ~TARGET_PAGE_MASK) {
> + error_report("%s is too small to mmap, this may affect
> performance.\n",
> + name);
> + return;
> + }
> +
> + /*
> + * We can't mmap areas overlapping the MSIX vector table, so we
> + * potentially insert a direct-mapped subregion before and after it.
> + */
> + if (vdev->msix && vdev->msix->table_bar == nr) {
> + size = vdev->msix->table_offset & TARGET_PAGE_MASK;
> + }
> +
> + if (size) {
> + strcat(name, " mmap");
strncat + trailing NUL.
> + if (vfio_mmap_bar(bar, &bar->mem, &bar->mmap_mem, &bar->mmap,
> + size, 0, name)) {
> + error_report("%s Failed. Performance may be slow\n", name);
> + }
> + }
> +
> + if (vdev->msix && vdev->msix->table_bar == nr) {
> + unsigned start;
> +
> + start = TARGET_PAGE_ALIGN(vdev->msix->table_offset +
> + (vdev->msix->entries *
> PCI_MSIX_ENTRY_SIZE));
> +
> + if (start < bar->size) {
> + size = bar->size - start;
> + strcat(name, " msix-hi");
> + /* MSIXInfo contains another MemoryRegion for this mapping */
> + if (vfio_mmap_bar(bar, &bar->mem, &vdev->msix->mmap_mem,
> + &vdev->msix->mmap, size, start, name)) {
> + error_report("%s Failed. Performance may be slow\n", name);
> + }
> + }
> + }
> +
> + return;
> +}
> +
> +static int vfio_map_bars(VFIODevice *vdev)
> +{
> + int i;
> +
> + for (i = 0; i < VFIO_PCI_ROM_REGION_INDEX; i++) {
> + VFIOBAR *bar;
> + int ret;
> + uint32_t bar_val;
> + uint8_t bar_type;
> +
> + bar = &vdev->bars[i];
> + if (!bar->size) {
> + continue;
> + }
> +
> + ret = pread(vdev->fd, &bar_val, sizeof(bar_val),
> + vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * i));
> + if (ret != sizeof(bar_val)) {
> + error_report("vfio: Failed to read BAR %d (%s)\n", i,
> + strerror(errno));
> + return -1;
> + }
> +
> + bar_val = le32_to_cpu(bar_val);
> + bar_type = bar_val & (bar_val & PCI_BASE_ADDRESS_SPACE_IO ?
> + ~PCI_BASE_ADDRESS_IO_MASK : ~PCI_BASE_ADDRESS_MEM_MASK);
> +
> + vfio_map_bar(vdev, i, bar_type);
> +
> + if (!(bar_type & PCI_BASE_ADDRESS_SPACE_IO) &&
> + bar_type & PCI_BASE_ADDRESS_MEM_TYPE_64) {
> + i++;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void vfio_unmap_bars(VFIODevice *vdev)
> +{
> + int i;
> +
> + for (i = 0; i < PCI_ROM_SLOT; i++) {
> + vfio_unmap_bar(vdev, i);
> + }
> +}
> +
> +/*
> + * General setup
> + */
> +static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos)
> +{
> + uint8_t tmp, next = 0xff;
> +
> + for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp;
> + tmp = pdev->config[tmp + 1]) {
> + if (tmp > pos && tmp < next) {
> + next = tmp;
> + }
> + }
> +
> + return next - pos;
> +}
> +
> +static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos)
> +{
> + PCIDevice *pdev = &vdev->pdev;
> + uint8_t cap_id, next, size;
> + int ret;
> +
> + cap_id = pdev->config[pos];
> + next = pdev->config[pos + 1];
> +
> + /*
> + * If it becomes important to configure capabilities to their actual
> + * size, use this as the default when it's something we don't recognize.
> + * Since qemu doesn't actually handle many of the config accesses,
> + * exact size doesn't seem worthwhile.
> + */
> + size = vfio_std_cap_max_size(pdev, pos);
> +
> + /*
> + * pci_add_capability always inserts the new capability at the head
> + * of the chain. Therefore to end up with a chain that matches the
> + * physical device, we insert from the end by making this recursive.
> + * This is also why we pre-caclulate size above as cached config space
> + * will be changed as we unwind the stack.
> + */
> + if (next) {
> + ret = vfio_add_std_cap(vdev, next);
> + if (ret) {
> + return ret;
> + }
> + } else {
> + pdev->config[PCI_CAPABILITY_LIST] = 0; /* Begin the rebuild */
> + }
> +
> + switch (cap_id) {
> + case PCI_CAP_ID_MSI:
> + ret = vfio_setup_msi(vdev, pos);
> + break;
> + case PCI_CAP_ID_MSIX:
> + ret = vfio_setup_msix(vdev, pos);
> + break;
> + default:
> + ret = pci_add_capability(pdev, cap_id, pos, size);
> + }
> +
> + if (ret < 0) {
> + error_report("vfio: %04x:%02x:%02x.%x Error adding PCI capability "
> + "address@hidden: %d\n", vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function,
> + cap_id, size, pos, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int vfio_add_capabilities(VFIODevice *vdev)
> +{
> + PCIDevice *pdev = &vdev->pdev;
> +
> + if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) ||
> + !pdev->config[PCI_CAPABILITY_LIST]) {
> + return 0; /* Nothing to add */
> + }
> +
> + return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
> +}
> +
> +static int vfio_load_rom(VFIODevice *vdev)
> +{
> + uint64_t size = vdev->rom_size;
> + const VMStateDescription *vmsd;
> + char name[32];
> + off_t off = 0, voff = vdev->rom_offset;
> + ssize_t bytes;
> + void *ptr;
> +
> + /* If loading ROM from file, pci handles it */
> + if (vdev->pdev.romfile || !vdev->pdev.rom_bar || !size)
Braces.
> + return 0;
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x)\n", __FUNCTION__, vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function);
> +
> + vmsd = qdev_get_vmsd(DEVICE(&vdev->pdev));
> +
> + if (vmsd) {
> + snprintf(name, sizeof(name), "%s.rom", vmsd->name);
> + } else {
> + snprintf(name, sizeof(name), "%s.rom",
> + object_get_typename(OBJECT(&vdev->pdev)));
> + }
> + memory_region_init_ram(&vdev->pdev.rom, name, size);
> + ptr = memory_region_get_ram_ptr(&vdev->pdev.rom);
> + memset(ptr, 0xff, size);
> +
> + while (size) {
> + bytes = pread(vdev->fd, ptr + off, size, voff + off);
> + if (bytes == 0) {
> + break; /* expect that we could get back less than the ROM BAR */
> + } else if (bytes > 0) {
> + off += bytes;
> + size -= bytes;
> + } else {
> + if (errno == EINTR || errno == EAGAIN) {
> + continue;
> + }
> + error_report("vfio: Error reading device ROM: %s\n",
> + strerror(errno));
> + memory_region_destroy(&vdev->pdev.rom);
> + return -1;
> + }
> + }
> +
> + pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, 0, &vdev->pdev.rom);
> + vdev->pdev.has_rom = true;
> + return 0;
> +}
> +
> +static int vfio_connect_container(VFIOGroup *group)
> +{
> + VFIOContainer *container;
> + int ret, fd;
> +
> + if (group->container) {
> + return 0;
> + }
> +
> + QLIST_FOREACH(container, &container_list, next) {
> + if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
> + group->container = container;
> + QLIST_INSERT_HEAD(&container->group_list, group, container_next);
> + return 0;
> + }
> + }
> +
> + fd = qemu_open("/dev/vfio/vfio", O_RDWR);
> + if (fd < 0) {
> + error_report("vfio: failed to open /dev/vfio/vfio: %s\n",
> + strerror(errno));
> + return -1;
> + }
> +
> + ret = ioctl(fd, VFIO_GET_API_VERSION);
> + if (ret != VFIO_API_VERSION) {
> + error_report("vfio: supported vfio version: %d, "
> + "reported version: %d\n", VFIO_API_VERSION, ret);
> + close(fd);
> + return -1;
> + }
> +
> + container = g_malloc0(sizeof(*container));
> + container->fd = fd;
> +
> + if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) {
> + ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
> + if (ret) {
> + error_report("vfio: failed to set group container: %s\n",
> + strerror(errno));
> + g_free(container);
> + close(fd);
> + return -1;
> + }
> +
> + ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU);
> + if (ret) {
> + error_report("vfio: failed to set iommu for container: %s\n",
> + strerror(errno));
> + g_free(container);
> + close(fd);
> + return -1;
> + }
> +
> + container->iommu_data.listener = (MemoryListener) {
> + .begin = vfio_listener_dummy1,
> + .commit = vfio_listener_dummy1,
> + .region_add = vfio_listener_region_add,
> + .region_del = vfio_listener_region_del,
> + .region_nop = vfio_listener_dummy2,
> + .log_start = vfio_listener_dummy2,
> + .log_stop = vfio_listener_dummy2,
> + .log_sync = vfio_listener_dummy2,
> + .log_global_start = vfio_listener_dummy1,
> + .log_global_stop = vfio_listener_dummy1,
> + .eventfd_add = vfio_listener_dummy3,
> + .eventfd_del = vfio_listener_dummy3,
> + };
> + container->iommu_data.release = vfio_listener_release;
> +
> + memory_listener_register(&container->iommu_data.listener,
> + get_system_memory());
> + } else {
> + error_report("vfio: No available IOMMU models\n");
> + g_free(container);
> + close(fd);
> + return -1;
> + }
> +
> + QLIST_INIT(&container->group_list);
> + QLIST_INSERT_HEAD(&container_list, container, next);
> +
> + group->container = container;
> + QLIST_INSERT_HEAD(&container->group_list, group, container_next);
> +
> + return 0;
> +}
> +
> +static void vfio_disconnect_container(VFIOGroup *group)
> +{
> + VFIOContainer *container = group->container;
> +
> + if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
> + error_report("vfio: error disconnecting group %d from container\n",
> + group->groupid);
> + }
> +
> + QLIST_REMOVE(group, container_next);
> + group->container = NULL;
> +
> + if (QLIST_EMPTY(&container->group_list)) {
> + if (container->iommu_data.release) {
> + container->iommu_data.release(container);
> + }
> + QLIST_REMOVE(container, next);
> + DPRINTF("vfio_disconnect_container: close container->fd\n");
> + close(container->fd);
> + g_free(container);
> + }
> +}
> +
> +static VFIOGroup *vfio_get_group(int groupid)
> +{
> + VFIOGroup *group;
> + char path[32];
> + struct vfio_group_status status = { .argsz = sizeof(status) };
> +
> + QLIST_FOREACH(group, &group_list, next) {
> + if (group->groupid == groupid) {
> + return group;
> + }
> + }
> +
> + group = g_malloc0(sizeof(*group));
> +
> + sprintf(path, "/dev/vfio/%d", groupid);
snprintf
> + group->fd = qemu_open(path, O_RDWR);
> + if (group->fd < 0) {
> + error_report("vfio: error opening %s: %s", path, strerror(errno));
> + g_free(group);
> + return NULL;
> + }
> +
> + if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
> + error_report("vfio: error getting group status: %s\n",
> + strerror(errno));
> + close(group->fd);
> + g_free(group);
> + return NULL;
> + }
> +
> + if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
> + error_report("vfio: error, group %d is not viable, please ensure "
> + "all devices within the iommu_group are bound to their "
> + "vfio bus driver.\n", groupid);
> + close(group->fd);
> + g_free(group);
> + return NULL;
> + }
> +
> + group->groupid = groupid;
> + QLIST_INIT(&group->device_list);
> +
> + if (vfio_connect_container(group)) {
> + error_report("vfio: failed to setup container for group %d\n",
> groupid);
> + close(group->fd);
> + g_free(group);
> + return NULL;
> + }
> +
> + QLIST_INSERT_HEAD(&group_list, group, next);
> +
> + return group;
> +}
> +
> +static void vfio_put_group(VFIOGroup *group)
> +{
> + if (!QLIST_EMPTY(&group->device_list)) {
> + return;
> + }
> +
> + vfio_disconnect_container(group);
> + QLIST_REMOVE(group, next);
> + DPRINTF("vfio_put_group: close group->fd\n");
> + close(group->fd);
> + g_free(group);
> +}
> +
> +static int __vfio_get_device(VFIOGroup *group,
> + const char *name, VFIODevice *vdev)
Please remove leading underscores.
> +{
> + int ret;
> +
> + ret = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
> + if (ret < 0) {
> + error_report("vfio: error getting device %s from group %d: %s",
> + name, group->groupid, strerror(errno));
> + error_report("Verify all devices in group %d "
> + "are bound to vfio-pci or pci-stub and not already in
> use",
> + group->groupid);
> + return -1;
> + }
> +
> + vdev->group = group;
> + QLIST_INSERT_HEAD(&group->device_list, vdev, next);
> +
> + vdev->fd = ret;
> +
> + return 0;
> +}
> +
> +static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice
> *vdev)
> +{
> + struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
> + struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
> + int ret, i;
> +
> + ret = __vfio_get_device(group, name, vdev);
> + if (ret) {
> + return ret;
> + }
> +
> + /* Sanity check device */
> + ret = ioctl(vdev->fd, VFIO_DEVICE_GET_INFO, &dev_info);
> + if (ret) {
> + error_report("vfio: error getting device info: %s", strerror(errno));
> + goto error;
> + }
> +
> + DPRINTF("Device %s flags: %u, regions: %u, irgs: %u\n", name,
> + dev_info.flags, dev_info.num_regions, dev_info.num_irqs);
> +
> + if (!(dev_info.flags & VFIO_DEVICE_FLAGS_PCI)) {
> + error_report("vfio: Um, this isn't a PCI device");
> + goto error;
> + }
> +
> + vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
> + if (!vdev->reset_works) {
> + error_report("Warning, device %s does not support reset\n", name);
> + }
> +
> + if (dev_info.num_regions != VFIO_PCI_NUM_REGIONS) {
> + error_report("vfio: unexpected number of io regions %u",
> + dev_info.num_regions);
> + goto error;
> + }
> +
> + if (dev_info.num_irqs != VFIO_PCI_NUM_IRQS) {
> + error_report("vfio: unexpected number of irqs %u",
> dev_info.num_irqs);
> + goto error;
> + }
> +
> + for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++)
> {
> + reg_info.index = i;
> +
> + ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info);
> + if (ret) {
> + error_report("vfio: Error getting region %d info: %s", i,
> + strerror(errno));
> + goto error;
> + }
> +
> + DPRINTF("Device %s region %d:\n", name, i);
> + DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
> + (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
> + (unsigned long)reg_info.flags);
> +
> + vdev->bars[i].size = reg_info.size;
> + vdev->bars[i].fd_offset = reg_info.offset;
> + vdev->bars[i].fd = vdev->fd;
> + vdev->bars[i].nr = i;
> + }
> +
> + reg_info.index = VFIO_PCI_ROM_REGION_INDEX;
> +
> + ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info);
> + if (ret) {
> + error_report("vfio: Error getting ROM info: %s", strerror(errno));
> + goto error;
> + }
> +
> + DPRINTF("Device %s ROM:\n", name);
> + DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
> + (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
> + (unsigned long)reg_info.flags);
> +
> + vdev->rom_size = reg_info.size;
> + vdev->rom_offset = reg_info.offset;
> +
> + reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX;
> +
> + ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info);
> + if (ret) {
> + error_report("vfio: Error getting config info: %s", strerror(errno));
> + goto error;
> + }
> +
> + DPRINTF("Device %s config:\n", name);
> + DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
> + (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
> + (unsigned long)reg_info.flags);
> +
> + vdev->config_size = reg_info.size;
> + vdev->config_offset = reg_info.offset;
> +
> +error:
> + if (ret) {
> + QLIST_REMOVE(vdev, next);
> + vdev->group = NULL;
> + close(vdev->fd);
> + }
> + return ret;
> +}
> +
> +static void vfio_put_device(VFIODevice *vdev)
> +{
> + QLIST_REMOVE(vdev, next);
> + vdev->group = NULL;
> + DPRINTF("vfio_put_device: close vdev->fd\n");
> + close(vdev->fd);
> + if (vdev->msix) {
> + g_free(vdev->msix);
> + vdev->msix = NULL;
> + }
> +}
> +
> +static int vfio_initfn(struct PCIDevice *pdev)
> +{
> + VFIODevice *pvdev, *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> + VFIOGroup *group;
> + char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
> + ssize_t len;
> + struct stat st;
> + int groupid;
> + int ret;
> +
> + /* Check that the host device exists */
> + sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function);
snprintf
> + if (stat(path, &st) < 0) {
> + error_report("vfio: error: no such host device: %s", path);
> + return -1;
> + }
> +
> + strcat(path, "iommu_group");
strncat
> +
> + len = readlink(path, iommu_group_path, PATH_MAX);
> + if (len <= 0) {
> + error_report("vfio: error no iommu_group for device\n");
> + return -1;
> + }
> +
> + iommu_group_path[len] = 0;
> + group_name = basename(iommu_group_path);
> +
> + if (sscanf(group_name, "%d", &groupid) != 1) {
> + error_report("vfio: error reading %s: %s", path, strerror(errno));
> + return -1;
> + }
> +
> + DPRINTF("%s(%04x:%02x:%02x.%x) group %d\n", __FUNCTION__,
> vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function, groupid);
> +
> + group = vfio_get_group(groupid);
> + if (!group) {
> + error_report("vfio: failed to get group %d", groupid);
> + return -1;
> + }
> +
> + sprintf(path, "%04x:%02x:%02x.%01x",
> + vdev->host.domain, vdev->host.bus, vdev->host.slot,
> + vdev->host.function);
snprintf
> +
> + QLIST_FOREACH(pvdev, &group->device_list, next) {
> + if (pvdev->host.domain == vdev->host.domain &&
> + pvdev->host.bus == vdev->host.bus &&
> + pvdev->host.slot == vdev->host.slot &&
> + pvdev->host.function == vdev->host.function) {
> +
> + error_report("vfio: error: device %s is already attached\n",
> path);
> + vfio_put_group(group);
> + return -1;
> + }
> + }
> +
> + ret = vfio_get_device(group, path, vdev);
> + if (ret) {
> + error_report("vfio: failed to get device %s", path);
> + vfio_put_group(group);
> + return -1;
> + }
> +
> + /* Get a copy of config space */
> + assert(pci_config_size(&vdev->pdev) <= vdev->config_size);
> + ret = pread(vdev->fd, vdev->pdev.config,
> + pci_config_size(&vdev->pdev), vdev->config_offset);
> + if (ret < (int)pci_config_size(&vdev->pdev)) {
> + error_report("vfio: Failed to read device config space\n");
> + goto out_put;
> + }
> +
> + /*
> + * Clear host resource mapping info. If we choose not to register a
> + * BAR, such as might be the case with the option ROM, we can get
> + * confusing, unwritable, residual addresses from the host here.
> + */
> + memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24);
> + memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4);
> +
> + vfio_load_rom(vdev);
> +
> + if (vfio_early_setup_msix(vdev)) {
> + goto out_put;
> + }
> +
> + if (vfio_map_bars(vdev)) {
> + goto out_unmap_bars;
> + }
> +
> + if (vfio_add_capabilities(vdev)) {
> + goto out_teardown_msi;
> + }
> +
> + if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) {
> + pci_device_set_intx_routing_notifier(&vdev->pdev, vfio_update_irq);
> + }
> +
> + if (vfio_enable_intx(vdev)) {
> + goto out_teardown_msi;
> + }
> +
> + return 0;
> +
> +out_teardown_msi:
> + pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
> + vfio_teardown_msi(vdev);
> +out_unmap_bars:
> + vfio_unmap_bars(vdev);
> +out_put:
> + vfio_put_device(vdev);
> + vfio_put_group(group);
> + return -1;
> +}
> +
> +static void vfio_exitfn(struct PCIDevice *pdev)
> +{
> + VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> + VFIOGroup *group = vdev->group;
> +
> + pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
> + vfio_disable_interrupts(vdev);
> + vfio_teardown_msi(vdev);
> + vfio_unmap_bars(vdev);
> + vfio_put_device(vdev);
> + vfio_put_group(group);
> +}
> +
> +static void vfio_reset(DeviceState *dev)
> +{
> + PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev);
> + VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
> +
> + if (!vdev->reset_works) {
> + return;
> + }
> +
> + if (ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
> + error_report("vfio: Error unable to reset physical device "
> + "(%04x:%02x:%02x.%x): %s\n", vdev->host.domain,
> + vdev->host.bus, vdev->host.slot, vdev->host.function,
> + strerror(errno));
> + }
> +}
> +
> +static Property vfio_pci_dev_properties[] = {
> + DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIODevice, host),
> + //TODO - support passed fds... is this necessary?
> + //DEFINE_PROP_STRING("vfiofd", VFIODevice, vfiofd_name),
> + //DEFINE_PROP_STRING("vfiogroupfd, VFIODevice, vfiogroupfd_name),
> + DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +
> +static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
> +{
> + PCIDeviceClass *dc = PCI_DEVICE_CLASS(klass);
> +
> + dc->parent_class.reset = vfio_reset;
> + dc->init = vfio_initfn;
> + dc->exit = vfio_exitfn;
> + dc->config_read = vfio_pci_read_config;
> + dc->config_write = vfio_pci_write_config;
> + dc->parent_class.props = vfio_pci_dev_properties;
> +}
> +
> +static TypeInfo vfio_pci_dev_info = {
> + .name = "vfio-pci",
> + .parent = TYPE_PCI_DEVICE,
> + .instance_size = sizeof(VFIODevice),
> + .class_init = vfio_pci_dev_class_init,
> +};
> +
> +static void register_vfio_pci_dev_type(void)
> +{
> + type_register_static(&vfio_pci_dev_info);
> +}
> +
> +type_init(register_vfio_pci_dev_type)
> diff --git a/hw/vfio_pci.h b/hw/vfio_pci.h
> new file mode 100644
> index 0000000..9fb27ce
> --- /dev/null
> +++ b/hw/vfio_pci.h
> @@ -0,0 +1,100 @@
> +#ifndef __VFIO_H__
> +#define __VFIO_H__
HW_VFIO_PCI_H
> +
> +#include "qemu-common.h"
> +#include "qemu-queue.h"
> +#include "pci.h"
> +#include "event_notifier.h"
> +
> +typedef struct VFIOBAR {
> + off_t fd_offset; /* offset of BAR within device fd */
> + int fd; /* device fd, allows us to pass VFIOBAR as opaque data */
> + MemoryRegion mem; /* slow, read/write access */
> + MemoryRegion mmap_mem; /* direct mapped access */
> + void *mmap;
> + size_t size;
> + uint8_t nr; /* cache the BAR number for debug */
> +} VFIOBAR;
> +
> +typedef struct INTx {
> + bool pending; /* interrupt pending */
> + bool kvm_accel; /* set when Qemu bypass through KVM enabled */
> + uint8_t pin; /* which pin to pull for qemu_set_irq */
> + EventNotifier interrupt; /* eventfd triggered on interrupt */
> + EventNotifier unmask; /* eventfd for unmask on Qemu bypass */
> + PCIINTxRoute route; /* routing info for Qemu bypass */
> +} INTx;
> +
> +struct VFIODevice;
> +
> +typedef struct MSIVector {
> + EventNotifier interrupt; /* eventfd triggered on interrupt */
> + struct VFIODevice *vdev; /* back pointer to device */
> + int vector; /* the vector number for this element */
> + int virq; /* KVM irqchip route for Qemu bypass */
> + bool use;
> +} MSIVector;
> +
> +enum {
> + INT_NONE = 0,
> + INT_INTx = 1,
> + INT_MSI = 2,
> + INT_MSIX = 3,
> +};
> +
> +struct VFIOGroup;
> +
> +typedef struct VFIOContainer {
> + int fd; /* /dev/vfio/vfio, empowered by the attached groups */
> + struct {
> + /* enable abstraction to support various iommu backends */
> + union {
> + MemoryListener listener; /* Used by type1 iommu */
> + };
> + void (*release)(struct VFIOContainer *);
> + } iommu_data;
> + QLIST_HEAD(, VFIOGroup) group_list;
> + QLIST_ENTRY(VFIOContainer) next;
> +} VFIOContainer;
> +
> +/* Cache of MSI-X setup plus extra mmap and memory region for split BAR map
> */
> +typedef struct MSIXInfo {
> + uint8_t table_bar;
> + uint8_t pba_bar;
> + uint16_t entries;
> + uint32_t table_offset;
> + uint32_t pba_offset;
> + MemoryRegion mmap_mem;
> + void *mmap;
> +} MSIXInfo;
> +
> +typedef struct VFIODevice {
> + PCIDevice pdev;
> + int fd;
> + INTx intx;
> + unsigned int config_size;
> + off_t config_offset; /* Offset of config space region within device fd */
> + unsigned int rom_size;
> + off_t rom_offset; /* Offset of ROM region within device fd */
> + int msi_cap_size;
> + MSIVector *msi_vectors;
> + MSIXInfo *msix;
> + int nr_vectors; /* Number of MSI/MSIX vectors currently in use */
> + int interrupt; /* Current interrupt type */
> + VFIOBAR bars[PCI_NUM_REGIONS - 1]; /* No ROM */
> + PCIHostDeviceAddress host;
> + QLIST_ENTRY(VFIODevice) next;
> + struct VFIOGroup *group;
> + bool reset_works;
> +} VFIODevice;
> +
> +typedef struct VFIOGroup {
> + int fd;
> + int groupid;
> + VFIOContainer *container;
> + QLIST_HEAD(, VFIODevice) device_list;
> + QLIST_ENTRY(VFIOGroup) next;
> + QLIST_ENTRY(VFIOGroup) container_next;
> +} VFIOGroup;
> +
> +#endif /* __VFIO_H__ */
> diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
> index 5a9d4e3..bd1a76c 100644
> --- a/linux-headers/linux/kvm.h
> +++ b/linux-headers/linux/kvm.h
> @@ -617,6 +617,10 @@ struct kvm_ppc_smmu_info {
> #define KVM_CAP_SIGNAL_MSI 77
> #define KVM_CAP_PPC_GET_SMMU_INFO 78
> #define KVM_CAP_S390_COW 79
> +#define KVM_CAP_PPC_ALLOC_HTAB 80
> +#define KVM_CAP_IRQFD_LEVEL 81
> +#define KVM_CAP_EOIFD 82
> +#define KVM_CAP_EOIFD_LEVEL_IRQFD 83
>
> #ifdef KVM_CAP_IRQ_ROUTING
>
> @@ -682,6 +686,8 @@ struct kvm_xen_hvm_config {
> #endif
>
> #define KVM_IRQFD_FLAG_DEASSIGN (1 << 0)
> +/* Available with KVM_CAP_IRQFD_LEVEL */
> +#define KVM_IRQFD_FLAG_LEVEL (1 << 1)
>
> struct kvm_irqfd {
> __u32 fd;
> @@ -690,6 +696,17 @@ struct kvm_irqfd {
> __u8 pad[20];
> };
>
> +#define KVM_EOIFD_FLAG_DEASSIGN (1 << 0)
> +/* Available with KVM_CAP_EOIFD_LEVEL_IRQFD */
> +#define KVM_EOIFD_FLAG_LEVEL_IRQFD (1 << 1)
> +
> +struct kvm_eoifd {
> + __u32 fd;
> + __u32 flags;
> + __u32 key;
> + __u8 pad[20];
> +};
> +
> struct kvm_clock_data {
> __u64 clock;
> __u32 flags;
> @@ -828,6 +845,10 @@ struct kvm_s390_ucas_mapping {
> #define KVM_SIGNAL_MSI _IOW(KVMIO, 0xa5, struct kvm_msi)
> /* Available with KVM_CAP_PPC_GET_SMMU_INFO */
> #define KVM_PPC_GET_SMMU_INFO _IOR(KVMIO, 0xa6, struct kvm_ppc_smmu_info)
> +/* Available with KVM_CAP_PPC_ALLOC_HTAB */
> +#define KVM_PPC_ALLOCATE_HTAB _IOWR(KVMIO, 0xa7, __u32)
> +/* Available with KVM_CAP_EOIFD */
> +#define KVM_EOIFD _IOW(KVMIO, 0xa8, struct kvm_eoifd)
>
> /*
> * ioctls for vcpu fds
> diff --git a/linux-headers/linux/vfio.h b/linux-headers/linux/vfio.h
> new file mode 100644
> index 0000000..0a4f180
> --- /dev/null
> +++ b/linux-headers/linux/vfio.h
> @@ -0,0 +1,445 @@
> +/*
> + * VFIO API definition
> + *
> + * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
> + * Author: Alex Williamson <address@hidden>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +#ifndef VFIO_H
> +#define VFIO_H
> +
> +#include <linux/types.h>
> +#include <linux/ioctl.h>
> +
> +#define VFIO_API_VERSION 0
> +
> +#ifdef __KERNEL__ /* Internal VFIO-core/bus driver API */
> +
> +#include <linux/iommu.h>
> +#include <linux/mm.h>
> +
> +/**
> + * struct vfio_device_ops - VFIO bus driver device callbacks
> + *
> + * @open: Called when userspace creates new file descriptor for device
> + * @release: Called when userspace releases file descriptor for device
> + * @read: Perform read(2) on device file descriptor
> + * @write: Perform write(2) on device file descriptor
> + * @ioctl: Perform ioctl(2) on device file descriptor, supporting
> VFIO_DEVICE_*
> + * operations documented below
> + * @mmap: Perform mmap(2) on a region of the device file descriptor
> + */
> +struct vfio_device_ops {
> + char *name;
> + int (*open)(void *device_data);
> + void (*release)(void *device_data);
> + ssize_t (*read)(void *device_data, char __user *buf,
> + size_t count, loff_t *ppos);
> + ssize_t (*write)(void *device_data, const char __user *buf,
> + size_t count, loff_t *size);
> + long (*ioctl)(void *device_data, unsigned int cmd,
> + unsigned long arg);
> + int (*mmap)(void *device_data, struct vm_area_struct *vma);
> +};
> +
> +extern int vfio_add_group_dev(struct device *dev,
> + const struct vfio_device_ops *ops,
> + void *device_data);
> +
> +extern void *vfio_del_group_dev(struct device *dev);
> +
> +/**
> + * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
> + */
> +struct vfio_iommu_driver_ops {
> + char *name;
> + struct module *owner;
> + void *(*open)(unsigned long arg);
> + void (*release)(void *iommu_data);
> + ssize_t (*read)(void *iommu_data, char __user *buf,
> + size_t count, loff_t *ppos);
> + ssize_t (*write)(void *iommu_data, const char __user *buf,
> + size_t count, loff_t *size);
> + long (*ioctl)(void *iommu_data, unsigned int cmd,
> + unsigned long arg);
> + int (*mmap)(void *iommu_data, struct vm_area_struct *vma);
> + int (*attach_group)(void *iommu_data,
> + struct iommu_group *group);
> + void (*detach_group)(void *iommu_data,
> + struct iommu_group *group);
> +
> +};
> +
> +extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops
> *ops);
> +
> +extern void vfio_unregister_iommu_driver(
> + const struct vfio_iommu_driver_ops *ops);
> +
> +/**
> + * offsetofend(TYPE, MEMBER)
> + *
> + * @TYPE: The type of the structure
> + * @MEMBER: The member within the structure to get the end offset of
> + *
> + * Simple helper macro for dealing with variable sized structures passed
> + * from user space. This allows us to easily determine if the provided
> + * structure is sized to include various fields.
> + */
> +#define offsetofend(TYPE, MEMBER) ({ \
> + TYPE tmp; \
> + offsetof(TYPE, MEMBER) + sizeof(tmp.MEMBER); }) \
> +
> +#endif /* __KERNEL__ */
> +
> +/* Kernel & User level defines for VFIO IOCTLs. */
> +
> +/* Extensions */
> +
> +#define VFIO_TYPE1_IOMMU 1
> +
> +/*
> + * The IOCTL interface is designed for extensibility by embedding the
> + * structure length (argsz) and flags into structures passed between
> + * kernel and userspace. We therefore use the _IO() macro for these
> + * defines to avoid implicitly embedding a size into the ioctl request.
> + * As structure fields are added, argsz will increase to match and flag
> + * bits will be defined to indicate additional fields with valid data.
> + * It's *always* the caller's responsibility to indicate the size of
> + * the structure passed by setting argsz appropriately.
> + */
> +
> +#define VFIO_TYPE (';')
> +#define VFIO_BASE 100
> +
> +/* -------- IOCTLs for VFIO file descriptor (/dev/vfio/vfio) -------- */
> +
> +/**
> + * VFIO_GET_API_VERSION - _IO(VFIO_TYPE, VFIO_BASE + 0)
> + *
> + * Report the version of the VFIO API. This allows us to bump the entire
> + * API version should we later need to add or change features in incompatible
> + * ways.
> + * Return: VFIO_API_VERSION
> + * Availability: Always
> + */
> +#define VFIO_GET_API_VERSION _IO(VFIO_TYPE, VFIO_BASE + 0)
> +
> +/**
> + * VFIO_CHECK_EXTENSION - _IOW(VFIO_TYPE, VFIO_BASE + 1, __u32)
> + *
> + * Check whether an extension is supported.
> + * Return: 0 if not supported, 1 (or some other positive integer) if
> supported.
> + * Availability: Always
> + */
> +#define VFIO_CHECK_EXTENSION _IO(VFIO_TYPE, VFIO_BASE + 1)
> +
> +/**
> + * VFIO_SET_IOMMU - _IOW(VFIO_TYPE, VFIO_BASE + 2, __s32)
> + *
> + * Set the iommu to the given type. The type must be supported by an
> + * iommu driver as verified by calling CHECK_EXTENSION using the same
> + * type. A group must be set to this file descriptor before this
> + * ioctl is available. The IOMMU interfaces enabled by this call are
> + * specific to the value set.
> + * Return: 0 on success, -errno on failure
> + * Availability: When VFIO group attached
> + */
> +#define VFIO_SET_IOMMU _IO(VFIO_TYPE, VFIO_BASE + 2)
> +
> +/* -------- IOCTLs for GROUP file descriptors (/dev/vfio/$GROUP) -------- */
> +
> +/**
> + * VFIO_GROUP_GET_STATUS - _IOR(VFIO_TYPE, VFIO_BASE + 3,
> + * struct vfio_group_status)
> + *
> + * Retrieve information about the group. Fills in provided
> + * struct vfio_group_info. Caller sets argsz.
> + * Return: 0 on succes, -errno on failure.
> + * Availability: Always
> + */
> +struct vfio_group_status {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_GROUP_FLAGS_VIABLE (1 << 0)
> +#define VFIO_GROUP_FLAGS_CONTAINER_SET (1 << 1)
> +};
> +#define VFIO_GROUP_GET_STATUS _IO(VFIO_TYPE, VFIO_BASE + 3)
> +
> +/**
> + * VFIO_GROUP_SET_CONTAINER - _IOW(VFIO_TYPE, VFIO_BASE + 4, __s32)
> + *
> + * Set the container for the VFIO group to the open VFIO file
> + * descriptor provided. Groups may only belong to a single
> + * container. Containers may, at their discretion, support multiple
> + * groups. Only when a container is set are all of the interfaces
> + * of the VFIO file descriptor and the VFIO group file descriptor
> + * available to the user.
> + * Return: 0 on success, -errno on failure.
> + * Availability: Always
> + */
> +#define VFIO_GROUP_SET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 4)
> +
> +/**
> + * VFIO_GROUP_UNSET_CONTAINER - _IO(VFIO_TYPE, VFIO_BASE + 5)
> + *
> + * Remove the group from the attached container. This is the
> + * opposite of the SET_CONTAINER call and returns the group to
> + * an initial state. All device file descriptors must be released
> + * prior to calling this interface. When removing the last group
> + * from a container, the IOMMU will be disabled and all state lost,
> + * effectively also returning the VFIO file descriptor to an initial
> + * state.
> + * Return: 0 on success, -errno on failure.
> + * Availability: When attached to container
> + */
> +#define VFIO_GROUP_UNSET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 5)
> +
> +/**
> + * VFIO_GROUP_GET_DEVICE_FD - _IOW(VFIO_TYPE, VFIO_BASE + 6, char)
> + *
> + * Return a new file descriptor for the device object described by
> + * the provided string. The string should match a device listed in
> + * the devices subdirectory of the IOMMU group sysfs entry. The
> + * group containing the device must already be added to this context.
> + * Return: new file descriptor on success, -errno on failure.
> + * Availability: When attached to container
> + */
> +#define VFIO_GROUP_GET_DEVICE_FD _IO(VFIO_TYPE, VFIO_BASE + 6)
> +
> +/* --------------- IOCTLs for DEVICE file descriptors --------------- */
> +
> +/**
> + * VFIO_DEVICE_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 7,
> + * struct vfio_device_info)
> + *
> + * Retrieve information about the device. Fills in provided
> + * struct vfio_device_info. Caller sets argsz.
> + * Return: 0 on success, -errno on failure.
> + */
> +struct vfio_device_info {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports
> reset */
> +#define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
> + __u32 num_regions; /* Max region index + 1 */
> + __u32 num_irqs; /* Max IRQ index + 1 */
> +};
> +#define VFIO_DEVICE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 7)
> +
> +/**
> + * VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8,
> + * struct vfio_region_info)
> + *
> + * Retrieve information about a device region. Caller provides
> + * struct vfio_region_info with index value set. Caller sets argsz.
> + * Implementation of region mapping is bus driver specific. This is
> + * intended to describe MMIO, I/O port, as well as bus specific
> + * regions (ex. PCI config space). Zero sized regions may be used
> + * to describe unimplemented regions (ex. unimplemented PCI BARs).
> + * Return: 0 on success, -errno on failure.
> + */
> +struct vfio_region_info {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_REGION_INFO_FLAG_READ (1 << 0) /* Region supports read */
> +#define VFIO_REGION_INFO_FLAG_WRITE (1 << 1) /* Region supports write */
> +#define VFIO_REGION_INFO_FLAG_MMAP (1 << 2) /* Region supports mmap */
> + __u32 index; /* Region index */
> + __u32 resv; /* Reserved for alignment */
> + __u64 size; /* Region size (bytes) */
> + __u64 offset; /* Region offset from start of device fd */
> +};
> +#define VFIO_DEVICE_GET_REGION_INFO _IO(VFIO_TYPE, VFIO_BASE + 8)
> +
> +/**
> + * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9,
> + * struct vfio_irq_info)
> + *
> + * Retrieve information about a device IRQ. Caller provides
> + * struct vfio_irq_info with index value set. Caller sets argsz.
> + * Implementation of IRQ mapping is bus driver specific. Indexes
> + * using multiple IRQs are primarily intended to support MSI-like
> + * interrupt blocks. Zero count irq blocks may be used to describe
> + * unimplemented interrupt types.
> + *
> + * The EVENTFD flag indicates the interrupt index supports eventfd based
> + * signaling.
> + *
> + * The MASKABLE flags indicates the index supports MASK and UNMASK
> + * actions described below.
> + *
> + * AUTOMASKED indicates that after signaling, the interrupt line is
> + * automatically masked by VFIO and the user needs to unmask the line
> + * to receive new interrupts. This is primarily intended to distinguish
> + * level triggered interrupts.
> + *
> + * The NORESIZE flag indicates that the interrupt lines within the index
> + * are setup as a set and new subindexes cannot be enabled without first
> + * disabling the entire index. This is used for interrupts like PCI MSI
> + * and MSI-X where the driver may only use a subset of the available
> + * indexes, but VFIO needs to enable a specific number of vectors
> + * upfront. In the case of MSI-X, where the user can enable MSI-X and
> + * then add and unmask vectors, it's up to userspace to make the decision
> + * whether to allocate the maximum supported number of vectors or tear
> + * down setup and incrementally increase the vectors as each is enabled.
> + */
> +struct vfio_irq_info {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_IRQ_INFO_EVENTFD (1 << 0)
> +#define VFIO_IRQ_INFO_MASKABLE (1 << 1)
> +#define VFIO_IRQ_INFO_AUTOMASKED (1 << 2)
> +#define VFIO_IRQ_INFO_NORESIZE (1 << 3)
> + __u32 index; /* IRQ index */
> + __u32 count; /* Number of IRQs within this index */
> +};
> +#define VFIO_DEVICE_GET_IRQ_INFO _IO(VFIO_TYPE, VFIO_BASE + 9)
> +
> +/**
> + * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct
> vfio_irq_set)
> + *
> + * Set signaling, masking, and unmasking of interrupts. Caller provides
> + * struct vfio_irq_set with all fields set. 'start' and 'count' indicate
> + * the range of subindexes being specified.
> + *
> + * The DATA flags specify the type of data provided. If DATA_NONE, the
> + * operation performs the specified action immediately on the specified
> + * interrupt(s). For example, to unmask AUTOMASKED interrupt [0,0]:
> + * flags = (DATA_NONE|ACTION_UNMASK), index = 0, start = 0, count = 1.
> + *
> + * DATA_BOOL allows sparse support for the same on arrays of interrupts.
> + * For example, to mask interrupts [0,1] and [0,3] (but not [0,2]):
> + * flags = (DATA_BOOL|ACTION_MASK), index = 0, start = 1, count = 3,
> + * data = {1,0,1}
> + *
> + * DATA_EVENTFD binds the specified ACTION to the provided __s32 eventfd.
> + * A value of -1 can be used to either de-assign interrupts if already
> + * assigned or skip un-assigned interrupts. For example, to set an eventfd
> + * to be trigger for interrupts [0,0] and [0,2]:
> + * flags = (DATA_EVENTFD|ACTION_TRIGGER), index = 0, start = 0, count = 3,
> + * data = {fd1, -1, fd2}
> + * If index [0,1] is previously set, two count = 1 ioctls calls would be
> + * required to set [0,0] and [0,2] without changing [0,1].
> + *
> + * Once a signaling mechanism is set, DATA_BOOL or DATA_NONE can be used
> + * with ACTION_TRIGGER to perform kernel level interrupt loopback testing
> + * from userspace (ie. simulate hardware triggering).
> + *
> + * Setting of an event triggering mechanism to userspace for ACTION_TRIGGER
> + * enables the interrupt index for the device. Individual subindex
> interrupts
> + * can be disabled using the -1 value for DATA_EVENTFD or the index can be
> + * disabled as a whole with: flags = (DATA_NONE|ACTION_TRIGGER), count = 0.
> + *
> + * Note that ACTION_[UN]MASK specify user->kernel signaling (irqfds) while
> + * ACTION_TRIGGER specifies kernel->user signaling.
> + */
> +struct vfio_irq_set {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_IRQ_SET_DATA_NONE (1 << 0) /* Data not present */
> +#define VFIO_IRQ_SET_DATA_BOOL (1 << 1) /* Data is bool (u8) */
> +#define VFIO_IRQ_SET_DATA_EVENTFD (1 << 2) /* Data is eventfd (s32) */
> +#define VFIO_IRQ_SET_ACTION_MASK (1 << 3) /* Mask interrupt */
> +#define VFIO_IRQ_SET_ACTION_UNMASK (1 << 4) /* Unmask interrupt */
> +#define VFIO_IRQ_SET_ACTION_TRIGGER (1 << 5) /* Trigger interrupt */
> + __u32 index;
> + __u32 start;
> + __u32 count;
> + __u8 data[];
> +};
> +#define VFIO_DEVICE_SET_IRQS _IO(VFIO_TYPE, VFIO_BASE + 10)
> +
> +#define VFIO_IRQ_SET_DATA_TYPE_MASK (VFIO_IRQ_SET_DATA_NONE | \
> + VFIO_IRQ_SET_DATA_BOOL | \
> + VFIO_IRQ_SET_DATA_EVENTFD)
> +#define VFIO_IRQ_SET_ACTION_TYPE_MASK (VFIO_IRQ_SET_ACTION_MASK | \
> + VFIO_IRQ_SET_ACTION_UNMASK | \
> + VFIO_IRQ_SET_ACTION_TRIGGER)
> +/**
> + * VFIO_DEVICE_RESET - _IO(VFIO_TYPE, VFIO_BASE + 11)
> + *
> + * Reset a device.
> + */
> +#define VFIO_DEVICE_RESET _IO(VFIO_TYPE, VFIO_BASE + 11)
> +
> +/*
> + * The VFIO-PCI bus driver makes use of the following fixed region and
> + * IRQ index mapping. Unimplemented regions return a size of zero.
> + * Unimplemented IRQ types return a count of zero.
> + */
> +
> +enum {
> + VFIO_PCI_BAR0_REGION_INDEX,
> + VFIO_PCI_BAR1_REGION_INDEX,
> + VFIO_PCI_BAR2_REGION_INDEX,
> + VFIO_PCI_BAR3_REGION_INDEX,
> + VFIO_PCI_BAR4_REGION_INDEX,
> + VFIO_PCI_BAR5_REGION_INDEX,
> + VFIO_PCI_ROM_REGION_INDEX,
> + VFIO_PCI_CONFIG_REGION_INDEX,
> + VFIO_PCI_NUM_REGIONS
> +};
> +
> +enum {
> + VFIO_PCI_INTX_IRQ_INDEX,
> + VFIO_PCI_MSI_IRQ_INDEX,
> + VFIO_PCI_MSIX_IRQ_INDEX,
> + VFIO_PCI_NUM_IRQS
> +};
> +
> +/* -------- API for Type1 VFIO IOMMU -------- */
> +
> +/**
> + * VFIO_IOMMU_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 12, struct
> vfio_iommu_info)
> + *
> + * Retrieve information about the IOMMU object. Fills in provided
> + * struct vfio_iommu_info. Caller sets argsz.
> + *
> + * XXX Should we do these by CHECK_EXTENSION too?
> + */
> +struct vfio_iommu_type1_info {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info
> */
> + __u64 iova_pgsizes; /* Bitmap of supported page sizes */
> +};
> +
> +#define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
> +
> +/**
> + * VFIO_IOMMU_MAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 13, struct vfio_dma_map)
> + *
> + * Map process virtual addresses to IO virtual addresses using the
> + * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required.
> + */
> +struct vfio_iommu_type1_dma_map {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from
> device */
> +#define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */
> + __u64 vaddr; /* Process virtual address */
> + __u64 iova; /* IO virtual address */
> + __u64 size; /* Size of mapping (bytes) */
> +};
> +
> +#define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13)
> +
> +/**
> + * VFIO_IOMMU_UNMAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 14, struct
> vfio_dma_unmap)
> + *
> + * Unmap IO virtual addresses using the provided struct vfio_dma_unmap.
> + * Caller sets argsz.
> + */
> +struct vfio_iommu_type1_dma_unmap {
> + __u32 argsz;
> + __u32 flags;
> + __u64 iova; /* IO virtual address */
> + __u64 size; /* Size of mapping (bytes) */
> +};
> +
> +#define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14)
> +
> +#endif /* VFIO_H */
>
>
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, (continued)
Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/26
Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Avi Kivity, 2012/07/26
Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu,
Blue Swirl <=