diff options
| -rw-r--r-- | hw/core/machine.c | 4 | ||||
| -rw-r--r-- | hw/virtio/virtio-mem.c | 51 | ||||
| -rw-r--r-- | include/hw/virtio/virtio-mem.h | 8 |
3 files changed, 60 insertions, 3 deletions
diff --git a/hw/core/machine.c b/hw/core/machine.c index f7761baab5..b5cd42cd8c 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -41,7 +41,9 @@ #include "hw/virtio/virtio-pci.h" #include "qom/object_interfaces.h" -GlobalProperty hw_compat_7_2[] = {}; +GlobalProperty hw_compat_7_2[] = { + { "virtio-mem", "x-early-migration", "false" }, +}; const size_t hw_compat_7_2_len = G_N_ELEMENTS(hw_compat_7_2); GlobalProperty hw_compat_7_1[] = { diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c index 02f7b5469a..ca37949df8 100644 --- a/hw/virtio/virtio-mem.c +++ b/hw/virtio/virtio-mem.c @@ -31,6 +31,8 @@ #include CONFIG_DEVICES #include "trace.h" +static const VMStateDescription vmstate_virtio_mem_device_early; + /* * We only had legacy x86 guests that did not support * VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE. Other targets don't have legacy guests. @@ -878,6 +880,10 @@ static void virtio_mem_device_realize(DeviceState *dev, Error **errp) host_memory_backend_set_mapped(vmem->memdev, true); vmstate_register_ram(&vmem->memdev->mr, DEVICE(vmem)); + if (vmem->early_migration) { + vmstate_register(VMSTATE_IF(vmem), VMSTATE_INSTANCE_ID_ANY, + &vmstate_virtio_mem_device_early, vmem); + } qemu_register_reset(virtio_mem_system_reset, vmem); /* @@ -899,6 +905,10 @@ static void virtio_mem_device_unrealize(DeviceState *dev) */ memory_region_set_ram_discard_manager(&vmem->memdev->mr, NULL); qemu_unregister_reset(virtio_mem_system_reset, vmem); + if (vmem->early_migration) { + vmstate_unregister(VMSTATE_IF(vmem), &vmstate_virtio_mem_device_early, + vmem); + } vmstate_unregister_ram(&vmem->memdev->mr, DEVICE(vmem)); host_memory_backend_set_mapped(vmem->memdev, false); virtio_del_queue(vdev, 0); @@ -1015,6 +1025,14 @@ static const VMStateDescription vmstate_virtio_mem_sanity_checks = { }, }; +static bool virtio_mem_vmstate_field_exists(void *opaque, int version_id) +{ + const VirtIOMEM *vmem = VIRTIO_MEM(opaque); + + /* With early migration, these fields were already migrated. */ + return !vmem->early_migration; +} + static const VMStateDescription vmstate_virtio_mem_device = { .name = "virtio-mem-device", .minimum_version_id = 1, @@ -1022,11 +1040,38 @@ static const VMStateDescription vmstate_virtio_mem_device = { .priority = MIG_PRI_VIRTIO_MEM, .post_load = virtio_mem_post_load, .fields = (VMStateField[]) { + VMSTATE_WITH_TMP_TEST(VirtIOMEM, virtio_mem_vmstate_field_exists, + VirtIOMEMMigSanityChecks, + vmstate_virtio_mem_sanity_checks), + VMSTATE_UINT64(usable_region_size, VirtIOMEM), + VMSTATE_UINT64_TEST(size, VirtIOMEM, virtio_mem_vmstate_field_exists), + VMSTATE_UINT64(requested_size, VirtIOMEM), + VMSTATE_BITMAP_TEST(bitmap, VirtIOMEM, virtio_mem_vmstate_field_exists, + 0, bitmap_size), + VMSTATE_END_OF_LIST() + }, +}; + +/* + * Transfer properties that are immutable while migration is active early, + * such that we have have this information around before migrating any RAM + * content. + * + * Note that virtio_mem_is_busy() makes sure these properties can no longer + * change on the migration source until migration completed. + * + * With QEMU compat machines, we transmit these properties later, via + * vmstate_virtio_mem_device instead -- see virtio_mem_vmstate_field_exists(). + */ +static const VMStateDescription vmstate_virtio_mem_device_early = { + .name = "virtio-mem-device-early", + .minimum_version_id = 1, + .version_id = 1, + .early_setup = true, + .fields = (VMStateField[]) { VMSTATE_WITH_TMP(VirtIOMEM, VirtIOMEMMigSanityChecks, vmstate_virtio_mem_sanity_checks), - VMSTATE_UINT64(usable_region_size, VirtIOMEM), VMSTATE_UINT64(size, VirtIOMEM), - VMSTATE_UINT64(requested_size, VirtIOMEM), VMSTATE_BITMAP(bitmap, VirtIOMEM, 0, bitmap_size), VMSTATE_END_OF_LIST() }, @@ -1211,6 +1256,8 @@ static Property virtio_mem_properties[] = { DEFINE_PROP_ON_OFF_AUTO(VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP, VirtIOMEM, unplugged_inaccessible, ON_OFF_AUTO_AUTO), #endif + DEFINE_PROP_BOOL(VIRTIO_MEM_EARLY_MIGRATION_PROP, VirtIOMEM, + early_migration, true), DEFINE_PROP_END_OF_LIST(), }; diff --git a/include/hw/virtio/virtio-mem.h b/include/hw/virtio/virtio-mem.h index 7745cfc1a3..f15e561785 100644 --- a/include/hw/virtio/virtio-mem.h +++ b/include/hw/virtio/virtio-mem.h @@ -31,6 +31,7 @@ OBJECT_DECLARE_TYPE(VirtIOMEM, VirtIOMEMClass, #define VIRTIO_MEM_BLOCK_SIZE_PROP "block-size" #define VIRTIO_MEM_ADDR_PROP "memaddr" #define VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP "unplugged-inaccessible" +#define VIRTIO_MEM_EARLY_MIGRATION_PROP "x-early-migration" #define VIRTIO_MEM_PREALLOC_PROP "prealloc" struct VirtIOMEM { @@ -74,6 +75,13 @@ struct VirtIOMEM { /* whether to prealloc memory when plugging new blocks */ bool prealloc; + /* + * Whether we migrate properties that are immutable while migration is + * active early, before state of other devices and especially, before + * migrating any RAM content. + */ + bool early_migration; + /* notifiers to notify when "size" changes */ NotifierList size_change_notifiers; |