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qemu-kvm/SOURCES/kvm-vfio-migration-Change-v...

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From 35c7d0d3b02d61d6f29afae74bd83edd70a6a1b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
Date: Wed, 12 Jul 2023 17:46:57 +0200
Subject: [PATCH 26/37] vfio/migration: Change vIOMMU blocker from global to
per device
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Cédric Le Goater <clg@redhat.com>
RH-MergeRequest: 179: vfio: live migration support
RH-Bugzilla: 2192818
RH-Acked-by: Eric Auger <eric.auger@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [24/28] 8fda1c82a81fadd4f38e6a5e878c9228a81c0f6e (clegoate/qemu-kvm-c9s)
Bugzilla: https://bugzilla.redhat.com/2192818
commit 3c26c80a0a26
Author: Zhenzhong Duan <zhenzhong.duan@intel.com>
Date: Mon Jul 3 15:15:07 2023 +0800
vfio/migration: Change vIOMMU blocker from global to per device
Contrary to multiple device blocker which needs to consider already-attached
devices to unblock/block dynamically, the vIOMMU migration blocker is a device
specific config. Meaning it only needs to know whether the device is bypassing
or not the vIOMMU (via machine property, or per pxb-pcie::bypass_iommu), and
does not need the state of currently present devices. For this reason, the
vIOMMU global migration blocker can be consolidated into the per-device
migration blocker, allowing us to remove some unnecessary code.
This change also makes vfio_mig_active() more accurate as it doesn't check for
global blocker.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
hw/vfio/common.c | 51 ++---------------------------------
hw/vfio/migration.c | 7 ++---
hw/vfio/pci.c | 1 -
include/hw/vfio/vfio-common.h | 3 +--
4 files changed, 7 insertions(+), 55 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 136d8243d6..e815f6ba30 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -362,7 +362,6 @@ bool vfio_mig_active(void)
}
static Error *multiple_devices_migration_blocker;
-static Error *giommu_migration_blocker;
static unsigned int vfio_migratable_device_num(void)
{
@@ -420,55 +419,9 @@ void vfio_unblock_multiple_devices_migration(void)
multiple_devices_migration_blocker = NULL;
}
-static bool vfio_viommu_preset(void)
+bool vfio_viommu_preset(VFIODevice *vbasedev)
{
- VFIOAddressSpace *space;
-
- QLIST_FOREACH(space, &vfio_address_spaces, list) {
- if (space->as != &address_space_memory) {
- return true;
- }
- }
-
- return false;
-}
-
-int vfio_block_giommu_migration(VFIODevice *vbasedev, Error **errp)
-{
- int ret;
-
- if (giommu_migration_blocker ||
- !vfio_viommu_preset()) {
- return 0;
- }
-
- if (vbasedev->enable_migration == ON_OFF_AUTO_ON) {
- error_setg(errp,
- "Migration is currently not supported with vIOMMU enabled");
- return -EINVAL;
- }
-
- error_setg(&giommu_migration_blocker,
- "Migration is currently not supported with vIOMMU enabled");
- ret = migrate_add_blocker(giommu_migration_blocker, errp);
- if (ret < 0) {
- error_free(giommu_migration_blocker);
- giommu_migration_blocker = NULL;
- }
-
- return ret;
-}
-
-void vfio_migration_finalize(void)
-{
- if (!giommu_migration_blocker ||
- vfio_viommu_preset()) {
- return;
- }
-
- migrate_del_blocker(giommu_migration_blocker);
- error_free(giommu_migration_blocker);
- giommu_migration_blocker = NULL;
+ return vbasedev->group->container->space->as != &address_space_memory;
}
static void vfio_set_migration_error(int err)
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 1db7d52ab2..e6e5e85f75 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -878,9 +878,10 @@ int vfio_migration_realize(VFIODevice *vbasedev, Error **errp)
return ret;
}
- ret = vfio_block_giommu_migration(vbasedev, errp);
- if (ret) {
- return ret;
+ if (vfio_viommu_preset(vbasedev)) {
+ error_setg(&err, "%s: Migration is currently not supported "
+ "with vIOMMU enabled", vbasedev->name);
+ return vfio_block_migration(vbasedev, err, errp);
}
trace_vfio_migration_realize(vbasedev->name);
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 2d059832a4..922c81872c 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3279,7 +3279,6 @@ static void vfio_instance_finalize(Object *obj)
*/
vfio_put_device(vdev);
vfio_put_group(group);
- vfio_migration_finalize();
}
static void vfio_exitfn(PCIDevice *pdev)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 93429b9abb..45167c8a8a 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -227,7 +227,7 @@ extern VFIOGroupList vfio_group_list;
bool vfio_mig_active(void);
int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp);
void vfio_unblock_multiple_devices_migration(void);
-int vfio_block_giommu_migration(VFIODevice *vbasedev, Error **errp);
+bool vfio_viommu_preset(VFIODevice *vbasedev);
int64_t vfio_mig_bytes_transferred(void);
void vfio_reset_bytes_transferred(void);
@@ -254,6 +254,5 @@ int vfio_spapr_remove_window(VFIOContainer *container,
int vfio_migration_realize(VFIODevice *vbasedev, Error **errp);
void vfio_migration_exit(VFIODevice *vbasedev);
-void vfio_migration_finalize(void);
#endif /* HW_VFIO_VFIO_COMMON_H */
--
2.39.3