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Subject[PATCH v4 0/5] KVM: SVM: Add initial GHCB protocol version 2 support
From: Joerg Roedel <>


here is a small set of patches which I took from the pending SEV-SNP
patch-sets to enable basic support for GHCB protocol version 2.

When SEV-SNP is not supported, only two new MSR protocol VMGEXIT calls
need to be supported:

- MSR-based AP-reset-hold
- MSR-based HV-feature-request

These calls are implemented here and then the protocol is lifted to
version 2.

This is submitted separately because the MSR-based AP-reset-hold call
is required to support kexec/kdump in SEV-ES guests.

The previous version can be found here:



Changes v3->v4:

- Rebased to kvm/queue
- Addressed Sean's review comments on v3

Brijesh Singh (2):
KVM: SVM: Add support for Hypervisor Feature support MSR protocol
KVM: SVM: Increase supported GHCB protocol version

Joerg Roedel (1):
KVM: SVM: Get rid of set_ghcb_msr() and *ghcb_msr_bits() functions

Sean Christopherson (1):
KVM: SVM: Add helper to generate GHCB MSR version info, and drop macro

Tom Lendacky (1):
KVM: SVM: Add support to handle AP reset MSR protocol

arch/x86/include/asm/kvm_host.h | 10 ++-
arch/x86/include/asm/sev-common.h | 14 ++--
arch/x86/include/uapi/asm/svm.h | 1 +
arch/x86/kvm/svm/sev.c | 131 ++++++++++++++++++++----------
arch/x86/kvm/svm/svm.h | 5 --
arch/x86/kvm/x86.c | 5 +-
6 files changed, 112 insertions(+), 54 deletions(-)

base-commit: 8960bc57dfb78f5de088af800576d9096282dca2

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