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69 lines
2.5 KiB
69 lines
2.5 KiB
From 76208f7824d5139ac8d86140b0e01031b67638cc Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Wed, 12 Jul 2023 17:46:56 +0200
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Subject: [PATCH 04/37] vfio/migration: Skip log_sync during migration SETUP
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state
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 179: vfio: live migration support
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RH-Bugzilla: 2192818
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [2/28] 4c340992b472ac4627b57705f4e971f14bbb0846 (clegoate/qemu-kvm-c9s)
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Bugzilla: https://bugzilla.redhat.com/2192818
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commit ff180c6bd7a8
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Author: Avihai Horon <avihaih@nvidia.com>
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Date: Mon Apr 3 16:00:00 2023 +0300
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vfio/migration: Skip log_sync during migration SETUP state
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Currently, VFIO log_sync can be issued while migration is in SETUP
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state. However, doing this log_sync is at best redundant and at worst
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can fail.
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Redundant -- all RAM is marked dirty in migration SETUP state and is
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transferred only after migration is set to ACTIVE state, so doing
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log_sync during migration SETUP is pointless.
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Can fail -- there is a time window, between setting migration state to
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SETUP and starting dirty tracking by RAM save_live_setup handler, during
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which dirty tracking is still not started. Any VFIO log_sync call that
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is issued during this time window will fail. For example, this error can
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be triggered by migrating a VM when a GUI is active, which constantly
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calls log_sync.
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Fix it by skipping VFIO log_sync while migration is in SETUP state.
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Fixes: 758b96b61d5c ("vfio/migrate: Move switch of dirty tracking into vfio_memory_listener")
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Signed-off-by: Avihai Horon <avihaih@nvidia.com>
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Link: https://lore.kernel.org/r/20230403130000.6422-1-avihaih@nvidia.com
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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hw/vfio/common.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/hw/vfio/common.c b/hw/vfio/common.c
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index 4d01ea3515..78358ede27 100644
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--- a/hw/vfio/common.c
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+++ b/hw/vfio/common.c
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@@ -478,7 +478,8 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
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VFIODevice *vbasedev;
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MigrationState *ms = migrate_get_current();
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- if (!migration_is_setup_or_active(ms->state)) {
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+ if (ms->state != MIGRATION_STATUS_ACTIVE &&
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+ ms->state != MIGRATION_STATUS_DEVICE) {
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return false;
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}
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--
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2.39.3
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