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Re: [PATCH v3] xen: fix build without pci passthrough
From: |
Paolo Bonzini |
Subject: |
Re: [PATCH v3] xen: fix build without pci passthrough |
Date: |
Wed, 3 Jun 2020 19:08:56 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 |
On 03/06/20 18:04, Anthony PERARD wrote:
> From: Roger Pau Monne <roger.pau@citrix.com>
>
> Xen PCI passthrough support may not be available and thus the global
> variable "has_igd_gfx_passthru" might be compiled out. Common code
> should not access it in that case.
>
> Unfortunately, we can't use CONFIG_XEN_PCI_PASSTHROUGH directly in
> xen-common.c so this patch instead move access to the
> has_igd_gfx_passthru variable via function and those functions are
> also implemented as stubs. The stubs will be used when QEMU is built
> without passthrough support.
>
> Now, when one will want to enable igd-passthru via the -machine
> property, they will get an error message if QEMU is built without
> passthrough support.
>
> Fixes: 46472d82322d0 ('xen: convert "-machine igd-passthru" to an accelerator
> property')
> Reported-by: Roger Pau Monné <roger.pau@citrix.com>
> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
> ---
>
> Notes:
> Changes in v3:
> - reworked to use stubs instead of #ifdef CONFIG_XEN_PCI_PASSTHROUGH
> CONFIG_XEN_PCI_PASSTHROUGH isn't available in xen-common.c
>
> moving CONFIG_XEN_PCI_PASSTHROUGH to be in config_host_mak isn't
> really possible, or at least I didn't managed to make that work.
>
> hw/i386/pc_piix.c | 2 +-
> hw/xen/xen-common.c | 4 ++--
> hw/xen/xen_pt.c | 12 +++++++++++-
> hw/xen/xen_pt.h | 6 ++++--
> stubs/Makefile.objs | 1 +
> stubs/xen-pt.c | 22 ++++++++++++++++++++++
> 6 files changed, 41 insertions(+), 6 deletions(-)
> create mode 100644 stubs/xen-pt.c
>
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index f66e1d73ce0b..347fb8c6c807 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -375,7 +375,7 @@ static void pc_init_isa(MachineState *machine)
> #ifdef CONFIG_XEN
> static void pc_xen_hvm_init_pci(MachineState *machine)
> {
> - const char *pci_type = has_igd_gfx_passthru ?
> + const char *pci_type = xen_igd_gfx_pt_enabled() ?
> TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE :
> TYPE_I440FX_PCI_DEVICE;
>
> pc_init1(machine,
> diff --git a/hw/xen/xen-common.c b/hw/xen/xen-common.c
> index 70564cc952d5..dd2c22cc4c0b 100644
> --- a/hw/xen/xen-common.c
> +++ b/hw/xen/xen-common.c
> @@ -129,12 +129,12 @@ static void xen_change_state_handler(void *opaque, int
> running,
>
> static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp)
> {
> - return has_igd_gfx_passthru;
> + return xen_igd_gfx_pt_enabled();
> }
>
> static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp)
> {
> - has_igd_gfx_passthru = value;
> + xen_igd_gfx_pt_set(value, errp);
> }
>
> static void xen_setup_post(MachineState *ms, AccelState *accel)
> diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
> index 81d5ad8da7f0..ab84443d5ec8 100644
> --- a/hw/xen/xen_pt.c
> +++ b/hw/xen/xen_pt.c
> @@ -65,7 +65,17 @@
> #include "qemu/range.h"
> #include "exec/address-spaces.h"
>
> -bool has_igd_gfx_passthru;
> +static bool has_igd_gfx_passthru;
> +
> +bool xen_igd_gfx_pt_enabled(void)
> +{
> + return has_igd_gfx_passthru;
> +}
> +
> +void xen_igd_gfx_pt_set(bool value, Error **errp)
> +{
> + has_igd_gfx_passthru = value;
> +}
>
> #define XEN_PT_NR_IRQS (256)
> static uint8_t xen_pt_mapped_machine_irq[XEN_PT_NR_IRQS] = {0};
> diff --git a/hw/xen/xen_pt.h b/hw/xen/xen_pt.h
> index 179775db7b22..6e9cec95f3b7 100644
> --- a/hw/xen/xen_pt.h
> +++ b/hw/xen/xen_pt.h
> @@ -5,6 +5,9 @@
> #include "hw/pci/pci.h"
> #include "xen-host-pci-device.h"
>
> +bool xen_igd_gfx_pt_enabled(void);
> +void xen_igd_gfx_pt_set(bool value, Error **errp);
> +
> void xen_pt_log(const PCIDevice *d, const char *f, ...) GCC_FMT_ATTR(2, 3);
>
> #define XEN_PT_ERR(d, _f, _a...) xen_pt_log(d, "%s: Error: "_f, __func__,
> ##_a)
> @@ -322,10 +325,9 @@ extern void *pci_assign_dev_load_option_rom(PCIDevice
> *dev,
> unsigned int domain,
> unsigned int bus, unsigned int
> slot,
> unsigned int function);
> -extern bool has_igd_gfx_passthru;
> static inline bool is_igd_vga_passthrough(XenHostPCIDevice *dev)
> {
> - return (has_igd_gfx_passthru
> + return (xen_igd_gfx_pt_enabled()
> && ((dev->class_code >> 0x8) == PCI_CLASS_DISPLAY_VGA));
> }
> int xen_pt_register_vga_regions(XenHostPCIDevice *dev);
> diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
> index 6a9e3135e8f9..564527e00997 100644
> --- a/stubs/Makefile.objs
> +++ b/stubs/Makefile.objs
> @@ -40,6 +40,7 @@ stub-obj-y += target-get-monitor-def.o
> stub-obj-y += vmgenid.o
> stub-obj-y += xen-common.o
> stub-obj-y += xen-hvm.o
> +stub-obj-y += xen-pt.o
> stub-obj-y += pci-host-piix.o
> stub-obj-y += ram-block.o
> stub-obj-y += ramfb.o
> diff --git a/stubs/xen-pt.c b/stubs/xen-pt.c
> new file mode 100644
> index 000000000000..2d8cac8d54b9
> --- /dev/null
> +++ b/stubs/xen-pt.c
> @@ -0,0 +1,22 @@
> +/*
> + * Copyright (C) 2020 Citrix Systems UK Ltd.
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "hw/xen/xen_pt.h"
> +#include "qapi/error.h"
> +
> +bool xen_igd_gfx_pt_enabled(void)
> +{
> + return false;
> +}
> +
> +void xen_igd_gfx_pt_set(bool value, Error **errp)
> +{
> + if (value) {
> + error_setg(errp, "Xen PCI passthrough support not built in");
> + }
> +}
>
Queued, thanks (I have other conflicting patches in the queue).
Paolo