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Re: [PATCH v9 QEMU 07/15] vfio: Add migration region initialization and
From: |
Alex Williamson |
Subject: |
Re: [PATCH v9 QEMU 07/15] vfio: Add migration region initialization and finalize function |
Date: |
Wed, 13 Nov 2019 22:01:51 -0700 |
On Tue, 12 Nov 2019 22:35:16 +0530
Kirti Wankhede <address@hidden> wrote:
> - Migration functions are implemented for VFIO_DEVICE_TYPE_PCI device in this
> patch series.
> - VFIO device supports migration or not is decided based of migration region
> query. If migration region query is successful and migration region
> initialization is successful then migration is supported else migration is
> blocked.
>
> Signed-off-by: Kirti Wankhede <address@hidden>
> Reviewed-by: Neo Jia <address@hidden>
> ---
> hw/vfio/Makefile.objs | 2 +-
> hw/vfio/migration.c | 137
> ++++++++++++++++++++++++++++++++++++++++++
> hw/vfio/trace-events | 3 +
> include/hw/vfio/vfio-common.h | 10 +++
> 4 files changed, 151 insertions(+), 1 deletion(-)
> create mode 100644 hw/vfio/migration.c
>
> diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs
> index abad8b818c9b..36033d1437c5 100644
> --- a/hw/vfio/Makefile.objs
> +++ b/hw/vfio/Makefile.objs
> @@ -1,4 +1,4 @@
> -obj-y += common.o spapr.o
> +obj-y += common.o spapr.o migration.o
> obj-$(CONFIG_VFIO_PCI) += pci.o pci-quirks.o display.o
> obj-$(CONFIG_VFIO_CCW) += ccw.o
> obj-$(CONFIG_VFIO_PLATFORM) += platform.o
> diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
> new file mode 100644
> index 000000000000..c17bd1b0b934
> --- /dev/null
> +++ b/hw/vfio/migration.c
> @@ -0,0 +1,137 @@
> +/*
> + * Migration support for VFIO devices
> + *
> + * Copyright NVIDIA, Inc. 2019
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2. See
> + * the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include <linux/vfio.h>
> +
> +#include "hw/vfio/vfio-common.h"
> +#include "cpu.h"
> +#include "migration/migration.h"
> +#include "migration/qemu-file.h"
> +#include "migration/register.h"
> +#include "migration/blocker.h"
> +#include "migration/misc.h"
> +#include "qapi/error.h"
> +#include "exec/ramlist.h"
> +#include "exec/ram_addr.h"
> +#include "pci.h"
> +#include "trace.h"
> +
> +static void vfio_migration_region_exit(VFIODevice *vbasedev)
> +{
> + VFIOMigration *migration = vbasedev->migration;
> +
> + if (!migration) {
> + return;
> + }
> +
> + if (migration->region.size) {
> + vfio_region_exit(&migration->region);
> + vfio_region_finalize(&migration->region);
> + }
> +}
> +
> +static int vfio_migration_region_init(VFIODevice *vbasedev, int index)
> +{
> + VFIOMigration *migration = vbasedev->migration;
> + Object *obj = NULL;
> + int ret = -EINVAL;
> +
> + if (!vbasedev->ops || !vbasedev->ops->vfio_get_object) {
Is it possible not to have vbasedev->ops?
> + return ret;
> + }
> +
> + obj = vbasedev->ops->vfio_get_object(vbasedev);
> + if (!obj) {
> + return ret;
> + }
> +
> + ret = vfio_region_setup(obj, vbasedev, &migration->region, index,
> + "migration");
> + if (ret) {
> + error_report("%s: Failed to setup VFIO migration region %d: %s",
> + vbasedev->name, index, strerror(-ret));
> + goto err;
> + }
> +
> + if (!migration->region.size) {
> + ret = -EINVAL;
> + error_report("%s: Invalid region size of VFIO migration region %d:
> %s",
> + vbasedev->name, index, strerror(-ret));
> + goto err;
> + }
> +
> + return 0;
> +
> +err:
> + vfio_migration_region_exit(vbasedev);
> + return ret;
> +}
> +
> +static int vfio_migration_init(VFIODevice *vbasedev,
> + struct vfio_region_info *info)
> +{
> + int ret;
> +
> + vbasedev->migration = g_new0(VFIOMigration, 1);
> +
> + ret = vfio_migration_region_init(vbasedev, info->index);
> + if (ret) {
> + error_report("%s: Failed to initialise migration region",
> + vbasedev->name);
> + g_free(vbasedev->migration);
Note that vbasedev->migration is not NULL, so calling
vfio_migration_region_exit() at this point will be a use-after-free
error.
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/* ---------------------------------------------------------------------- */
> +
> +int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
> +{
> + struct vfio_region_info *info;
> + Error *local_err = NULL;
> + int ret;
> +
> + ret = vfio_get_dev_region_info(vbasedev, VFIO_REGION_TYPE_MIGRATION,
> + VFIO_REGION_SUBTYPE_MIGRATION, &info);
> + if (ret) {
> + goto add_blocker;
> + }
> +
> + ret = vfio_migration_init(vbasedev, info);
> + if (ret) {
> + goto add_blocker;
> + }
> +
> + trace_vfio_migration_probe(vbasedev->name, info->index);
> + return 0;
> +
> +add_blocker:
> + error_setg(&vbasedev->migration_blocker,
> + "VFIO device doesn't support migration");
> + ret = migrate_add_blocker(vbasedev->migration_blocker, &local_err);
> + if (local_err) {
> + error_propagate(errp, local_err);
> + error_free(vbasedev->migration_blocker);
> + }
This won't get along well with the failover code that's in QEMU master.
> + return ret;
> +}
> +
> +void vfio_migration_finalize(VFIODevice *vbasedev)
> +{
> + if (vbasedev->migration_blocker) {
> + migrate_del_blocker(vbasedev->migration_blocker);
> + error_free(vbasedev->migration_blocker);
> + }
> +
> + vfio_migration_region_exit(vbasedev);
> + g_free(vbasedev->migration);
This will do bad things if vfio_migration_init() failed as indicated
above.
> +}
> diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
> index 8cdc27946cb8..191a726a1312 100644
> --- a/hw/vfio/trace-events
> +++ b/hw/vfio/trace-events
> @@ -143,3 +143,6 @@ vfio_display_edid_link_up(void) ""
> vfio_display_edid_link_down(void) ""
> vfio_display_edid_update(uint32_t prefx, uint32_t prefy) "%ux%u"
> vfio_display_edid_write_error(void) ""
> +
> +# migration.c
> +vfio_migration_probe(char *name, uint32_t index) " (%s) Region %d"
> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
> index d69a7f3ae31e..927511897a44 100644
> --- a/include/hw/vfio/vfio-common.h
> +++ b/include/hw/vfio/vfio-common.h
> @@ -57,6 +57,11 @@ typedef struct VFIORegion {
> uint8_t nr; /* cache the region number for debug */
> } VFIORegion;
>
> +typedef struct VFIOMigration {
> + VFIORegion region;
> + uint64_t pending_bytes;
pending_bytes is not used here, let's add it when it's needed.
> +} VFIOMigration;
> +
> typedef struct VFIOAddressSpace {
> AddressSpace *as;
> QLIST_HEAD(, VFIOContainer) containers;
> @@ -113,6 +118,8 @@ typedef struct VFIODevice {
> unsigned int num_irqs;
> unsigned int num_regions;
> unsigned int flags;
> + VFIOMigration *migration;
> + Error *migration_blocker;
See:
f045a0104c8c ("vfio: unplug failover primary device before migration")
Edit: I see once I got to the last patch how you managed this.
> } VFIODevice;
>
> struct VFIODeviceOps {
> @@ -204,4 +211,7 @@ int vfio_spapr_create_window(VFIOContainer *container,
> int vfio_spapr_remove_window(VFIOContainer *container,
> hwaddr offset_within_address_space);
>
> +int vfio_migration_probe(VFIODevice *vbasedev, Error **errp);
> +void vfio_migration_finalize(VFIODevice *vbasedev);
> +
> #endif /* HW_VFIO_VFIO_COMMON_H */
- [PATCH v9 Qemu 00/15] Add migration support for VFIO devices, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 01/15] vfio: KABI for migration interface for device state, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 02/15] vfio iommu: Add ioctl defination to get dirty pages bitmap., Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 03/15] vfio iommu: Add ioctl defination to unmap IOVA and return dirty bitmap, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 04/15] vfio: Add function to unmap VFIO region, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 05/15] vfio: Add vfio_get_object callback to VFIODeviceOps, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 06/15] vfio: Add save and load functions for VFIO PCI devices, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 07/15] vfio: Add migration region initialization and finalize function, Kirti Wankhede, 2019/11/12
- Re: [PATCH v9 QEMU 07/15] vfio: Add migration region initialization and finalize function,
Alex Williamson <=
- [PATCH v9 QEMU 08/15] vfio: Add VM state change handler to know state of VM, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 09/15] vfio: Add migration state change notifier, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 10/15] vfio: Register SaveVMHandlers for VFIO device, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 11/15] vfio: Add save state functions to SaveVMHandlers, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 14/15] vfio: Add ioctl to get dirty pages bitmap during dma unmap., Kirti Wankhede, 2019/11/12