KVM: SEV-ES: Disallow SEV-ES guests when X86_FEATURE_LBRV is absent

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[ Upstream commit d922056215 ]

As documented in APM[1], LBR Virtualization must be enabled for SEV-ES
guests. So, prevent SEV-ES guests when LBRV support is missing.

[1]: AMD64 Architecture Programmer's Manual Pub. 40332, Rev. 4.07 - June
     2023, Vol 2, 15.35.2 Enabling SEV-ES.
     https://bugzilla.kernel.org/attachment.cgi?id=304653

Fixes: 376c6d2850 ("KVM: SVM: Provide support for SEV-ES vCPU creation/loading")
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Message-ID: <20240531044644.768-3-ravi.bangoria@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Ravi Bangoria 2024-05-31 04:46:43 +00:00 • committed by Greg Kroah-Hartman

parent 91cff53136

commit 2128bae4ec

3 changed files with 14 additions and 9 deletions

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arch/x86/kvm/svm/sev.c

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16

arch/x86/kvm/svm/svm.c

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1

arch/x86/kvm/svm/svm.h

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