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KVM: SVM: Clear current_vmcb during vCPU free for all *possible* CPUs

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commit 1bee4838eb3a2c689f23c7170ea66ae87ea7d93a upstream.

When freeing a vCPU and thus its VMCB, clear current_vmcb for all possible
CPUs, not just online CPUs, as it's theoretically possible a CPU could go
offline and come back online in conjunction with KVM reusing the page for
a new VMCB.

Link: https://lore.kernel.org/all/20250320013759.3965869-1-yosry.ahmed@linux.dev
Fixes: fd65d3142f ("kvm: svm: Ensure an IBPB on all affected CPUs when freeing a vmcb")
Cc: stable@vger.kernel.org
Cc: Jim Mattson <jmattson@google.com>
Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
[sean: split to separate patch, write changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yosry Ahmed
2025-04-29 08:32:15 -07:00
committed by Greg Kroah-Hartman
parent 7775ab2d53
commit 0d7a2ea435
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/svm/svm.c
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@@ -1503,7 +1503,7 @@ static void svm_clear_current_vmcb(struct vmcb *vmcb)
{ {
int i; int i;
for_each_online_cpu(i) for_each_possible_cpu(i)
cmpxchg(per_cpu_ptr(&svm_data.current_vmcb, i), vmcb, NULL); cmpxchg(per_cpu_ptr(&svm_data.current_vmcb, i), vmcb, NULL);
} }