KVM: x86: Ensure vcpu->mode is loaded from memory in kvm_vcpu_exit_request()

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Wrap kvm_vcpu_exit_request()'s load of vcpu->mode with READ_ONCE() to
ensure the variable is re-loaded from memory, as there is no guarantee the
caller provides the necessary annotations to ensure KVM sees a fresh value,
e.g. the VM-Exit fastpath could theoretically reuse the pre-VM-Enter value.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20240828232013.768446-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2024-08-28 16:20:13 -07:00

parent 6e44d2427b

commit 3ffe874ea3

1 changed files with 3 additions and 2 deletions

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arch/x86/kvm/x86.c

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