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Avihai Horon b051a3f640 vfio/migration: Allow migration without VFIO IOMMU dirty tracking support 
Currently, if IOMMU of a VFIO container doesn't support dirty page
tracking, migration is blocked. This is because a DMA-able VFIO device
can dirty RAM pages without updating QEMU about it, thus breaking the
migration.

However, this doesn't mean that migration can't be done at all.
In such case, allow migration and let QEMU VFIO code mark all pages
dirty.

This guarantees that all pages that might have gotten dirty are reported
back, and thus guarantees a valid migration even without VFIO IOMMU
dirty tracking support.

The motivation for this patch is the introduction of iommufd [1].
iommufd can directly implement the /dev/vfio/vfio container IOCTLs by
mapping them into its internal ops, allowing the usage of these IOCTLs
over iommufd. However, VFIO IOMMU dirty tracking is not supported by
this VFIO compatibility API.

This patch will allow migration by hosts that use the VFIO compatibility
API and prevent migration regressions caused by the lack of VFIO IOMMU
dirty tracking support.

[1]
https://lore.kernel.org/kvm/0-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com/

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Link: https://lore.kernel.org/r/20230216143630.25610-4-avihaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
 		2023-02-16 12:13:46 -07:00
..
9pfs Don't include headers already included by qemu/osdep.h 2023-02-08 07:28:05 +01:00
acpi Drop duplicate #include 2023-02-08 07:28:05 +01:00
adc hw/adc: Make adci[*] R/W in NPCM7XX ADC 2022-07-18 13:20:14 +01:00
alpha Drop duplicate #include 2023-02-08 07:28:05 +01:00
arm Drop duplicate #include 2023-02-08 07:28:05 +01:00
audio include/hw/pci: Split pci_device.h off pci.h 2023-01-08 01:54:22 -05:00
avr Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
block virtio-blk: add missing AioContext lock 2023-02-09 10:21:23 -05:00
char include/hw: Do not include "hw/registerfields.h" in headers that don't need it 2023-02-14 09:02:42 +01:00
core Drop duplicate #include 2023-02-08 07:28:05 +01:00
cpu hw/cpu: Mark arm11 and realview mpcore as target-independent code 2023-01-16 17:51:20 +01:00
cris Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
cxl hw/cxl/cxl-host: Fix an error message typo 2023-01-17 10:02:37 +01:00
display Do not include "qemu/error-report.h" in headers that do not need it 2023-02-14 09:11:27 +01:00
dma bulk: Rename TARGET_FMT_plx -> HWADDR_FMT_plx 2023-01-18 11:14:34 +01:00
gpio hw/gpio/omap_gpio: Use CamelCase for TYPE_OMAP2_GPIO type name 2023-01-12 17:15:09 +00:00
hppa Drop duplicate #include 2023-02-08 07:28:05 +01:00
hyperv Fix non-first inclusions of qemu/osdep.h 2023-02-08 07:28:05 +01:00
i2c Don't include headers already included by qemu/osdep.h 2023-02-08 07:28:05 +01:00
i386 hw/misc/sga: Remove the deprecated "sga" device 2023-02-14 09:02:42 +01:00
ide virtio,pc,pci: features, cleanups, fixes 2023-01-09 10:07:12 +00:00
input hw/input: Clean up includes 2023-02-08 07:16:23 +01:00
intc target/arm: Mark up sysregs for HFGRTR bits 36..63 2023-02-03 12:59:23 +00:00
ipack include/hw/pci: Split pci_device.h off pci.h 2023-01-08 01:54:22 -05:00
ipmi include/hw/pci: Split pci_device.h off pci.h 2023-01-08 01:54:22 -05:00
isa hw/isa/isa-bus: Turn isa_build_aml() into qbus_build_aml() 2023-01-27 11:47:02 -05:00
loongarch Drop duplicate #include 2023-02-08 07:28:05 +01:00
m68k hw: Add compat machines for 8.0 2022-12-21 06:35:28 -05:00
mem hw/cxl/device: Add Flex Bus Port DVSEC 2022-12-21 07:32:24 -05:00
microblaze hw/microblaze: pass random seed to fdt 2022-09-21 19:59:56 +02:00
mips hw/mips/boston: Rename MachineState 'mc' pointer to 'ms' 2023-01-13 16:22:57 +01:00
misc Do not include "qemu/error-report.h" in headers that do not need it 2023-02-14 09:11:27 +01:00
net Drop duplicate #include 2023-02-08 07:28:05 +01:00
nios2 hw/nios2: set machine->fdt in nios2_load_dtb() 2022-10-17 16:15:10 -03:00
nubus qbus: Rename qbus_create_inplace() to qbus_init() 2021-09-30 13:42:10 +01:00
nvme hw/nvme updates 2023-01-11 16:41:13 +00:00
nvram aspeed queue: 2023-02-07 20:13:38 +00:00
openrisc openrisc: re-randomize rng-seed on reboot 2022-10-27 11:34:31 +01:00
pci pci: make sure pci_bus_is_express() won't error out with "discards ‘const’ qualifier" 2023-01-28 06:21:29 -05:00
pci-bridge pci: acpi hotplug: rename x-native-hotplug to x-do-not-expose-native-hotplug-cap 2023-01-28 06:21:29 -05:00
pci-host ppc/pnv/pci: Fix PHB xscom registers memory region name 2023-02-05 06:40:28 -03:00
pcmcia hw/pcmcia: Do not register PCMCIA type if not required 2021-05-02 17:24:50 +02:00
ppc Drop duplicate #include 2023-02-08 07:28:05 +01:00
rdma Drop duplicate #include 2023-02-08 07:28:05 +01:00
remote Drop duplicate #include 2023-02-08 07:28:05 +01:00
riscv hw/riscv: virt: Simplify virt_{get,set}_aclint() 2023-02-07 08:21:32 +10:00
rtc Drop duplicate #include 2023-02-08 07:28:05 +01:00
rx rx: re-randomize rng-seed on reboot 2022-10-27 11:34:31 +01:00
s390x migration: Rename res_{postcopy,precopy}_only 2023-02-15 20:04:30 +01:00
scsi block: Convert bdrv_refresh_total_sectors() to co_wrapper_mixed 2023-02-01 16:52:32 +01:00
sd hw/arm/omap: Drop useless casts from void * to pointer 2023-01-12 17:15:09 +00:00
sensor Don't include headers already included by qemu/osdep.h 2023-02-08 07:28:05 +01:00
sh4 bulk: Rename TARGET_FMT_plx -> HWADDR_FMT_plx 2023-01-18 11:14:34 +01:00
smbios include/hw/pci: Split pci_device.h off pci.h 2023-01-08 01:54:22 -05:00
sparc machine: make memory-backend a link property 2022-05-12 12:29:44 +02:00
sparc64 hw/sparc64/niagara: Use blk_name() instead of open-coding it 2023-01-20 07:25:01 +01:00
ssi include/hw: Do not include "hw/registerfields.h" in headers that don't need it 2023-02-14 09:02:42 +01:00
timer bulk: Rename TARGET_FMT_plx -> HWADDR_FMT_plx 2023-01-18 11:14:34 +01:00
tpm hw/tpm: Move tpm_ppi.c out of target-specific source set 2023-01-16 17:51:20 +01:00
tricore hw/tricore: fix inclusion of tricore_testboard 2021-07-20 20:10:21 +02:00
usb Don't include headers already included by qemu/osdep.h 2023-02-08 07:28:05 +01:00
vfio vfio/migration: Allow migration without VFIO IOMMU dirty tracking support 2023-02-16 12:13:46 -07:00
virtio vhost-user-fs: Back up vqs before cleaning up vhost_dev 2023-02-09 10:21:11 -05:00
watchdog hw/watchdog/wdt_aspeed: Log unimplemented registers as UNIMP level 2023-02-07 09:02:05 +01:00
xen bulk: Rename TARGET_FMT_plx -> HWADDR_FMT_plx 2023-01-18 11:14:34 +01:00
xenpv Warn user if the vga flag is passed but no vga device is created 2022-05-09 08:21:14 +02:00
xtensa hw/xtensa: fix reset value of MIROUT register of MX PIC 2022-05-06 15:27:40 -07:00
Kconfig hw/loongarch: Add support loongson3 virt machine type. 2022-06-06 18:09:03 +00:00
meson.build hw/loongarch: Add support loongson3 virt machine type. 2022-06-06 18:09:03 +00:00