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| author | Sean Christopherson <seanjc@google.com> | 2026-09-23 09:37:21 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2026-09-26 00:39:55 -0400 |
| commit | 93de2a6a4b91b72607136dd656edf03fb399d27f (patch) | |
| tree | 9220c76eb23cb39a146fac9692ee69afa4aa3135 /Documentation/ABI/testing/sysfs-driver-intel-xe-ras | |
| download | linux-stable-93de2a6a4b91b72607136dd656edf03fb399d27f.tar.gz linux-stable-93de2a6a4b91b72607136dd656edf03fb399d27f.zip | |
KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted
Manually perform cache maintenance on the source VM during intra-host
migration to ensure no stale data is left in CPU caches after the VM is
destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's
memory reclaim flows won't trigger cache maintenance, e.g. when all guest
memory is reclaimed in response to detaching from the mmu_notifier.
Note, relying on the destination VM to do cache maintenance isn't an option
as KVM doesn't require identical guest memory configurations, i.e. the
source VM may have access to memory that the destination VM does not.
Enforcing equivalent memory configurations is infeasible, as it would
require a *deep* comparison of memslots, e.g. to verify that not only are
the memslot identical, but what the memslots point at is also identical.
Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration")
Cc: stable@vger.kernel.org
Reported-by: Stefan Teodorescu <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-driver-intel-xe-ras')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-intel-xe-ras | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-intel-xe-ras b/Documentation/ABI/testing/sysfs-driver-intel-xe-ras new file mode 100644 index 000000000..3870e5a03 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intel-xe-ras @@ -0,0 +1,30 @@ +What: /sys/bus/pci/drivers/xe/.../gpu_health +Date: July 2026 +KernelVersion: 7.3 +Contact: intel-xe@lists.freedesktop.org +Description: + This file exposes the current gpu health state and allows the gpu + health state to be updated. + + This sysfs file is present only on Intel Xe platforms that support + the gpu health indicator interface for RAS. Reading the current + health state is available to all users, while updating the health + state is restricted to administrative users only. + + Read returns a single line containing one of the valid values for + the current gpu health state. Writing one of the valid values + updates the current gpu health state. + + The valid values for the gpu health state are: + + ok + The gpu is healthy and operating within normal + parameters. + + warning + The gpu is experiencing minor issues but remains + operational. + + critical + The gpu is in a critical state and may not be + operational. |