KVM: SVM: Add initial support for a VMGEXIT VMEXIT

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SEV-ES adds a new VMEXIT reason code, VMGEXIT. Initial support for a
VMGEXIT includes mapping the GHCB based on the guest GPA, which is
obtained from a new VMCB field, and then validating the required inputs
for the VMGEXIT exit reason.

Since many of the VMGEXIT exit reasons correspond to existing VMEXIT
reasons, the information from the GHCB is copied into the VMCB control
exit code areas and KVM register areas. The standard exit handlers are
invoked, similar to standard VMEXIT processing. Before restarting the
vCPU, the GHCB is updated with any registers that have been updated by
the hypervisor.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <c6a4ed4294a369bd75c44d03bd7ce0f0c3840e50.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Tom Lendacky 2020-12-10 11:09:47 -06:00 • committed by Paolo Bonzini

parent e9093fd492

commit 291bd20d5d

5 changed files with 292 additions and 3 deletions

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arch/x86/include/asm/svm.h

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arch/x86/include/uapi/asm/svm.h

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arch/x86/kvm/svm/sev.c

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arch/x86/kvm/svm/svm.c

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arch/x86/kvm/svm/svm.h

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