KVM: SVM: Add support for SEV-ES GHCB MSR protocol function 0x004

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The GHCB specification defines a GHCB MSR protocol using the lower
12-bits of the GHCB MSR (in the hypervisor this corresponds to the
GHCB GPA field in the VMCB).

Function 0x004 is a request for CPUID information. Only a single CPUID
result register can be sent per invocation, so the protocol defines the
register that is requested. The GHCB MSR value is set to the CPUID
register value as per the specification via the VMCB GHCB GPA field.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <fd7ee347d3936e484c06e9001e340bf6387092cd.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Tom Lendacky 2020-12-10 11:09:50 -06:00 • committed by Paolo Bonzini

parent 1edc14599e

commit d36946679e

2 changed files with 63 additions and 2 deletions

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56

arch/x86/kvm/svm/sev.c

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9

arch/x86/kvm/svm/svm.h

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