Re: [PATCH Part2 RFC v4 02/40] KVM: SVM: Provide the Hypervisor Feature support VMGEXIT
From: Sean Christopherson <seanjc@google.com>
Date: 2021-07-14 20:37:15
Also in:
kvm, linux-coco, linux-efi, linux-mm, lkml, platform-driver-x86
On Wed, Jul 07, 2021, Brijesh Singh wrote:
Version 2 of the GHCB specification introduced advertisement of features that are supported by the Hypervisor. Now that KVM supports version 2 of the GHCB specification, bump the maximum supported protocol version.
Heh, the changelog doesn't actually state that it's adding support for said advertisement of features. It took me a few seconds to figure out what the patch was doing, even though it's quite trivial in the end.
quoted hunk ↗ jump to hunk
Signed-off-by: Brijesh Singh <redacted> --- arch/x86/include/uapi/asm/svm.h | 4 ++-- arch/x86/kvm/svm/sev.c | 14 ++++++++++++++ arch/x86/kvm/svm/svm.h | 3 ++- 3 files changed, 18 insertions(+), 3 deletions(-)diff --git a/arch/x86/include/uapi/asm/svm.h b/arch/x86/include/uapi/asm/svm.h index 9aaf0ab386ef..ba4137abf012 100644 --- a/arch/x86/include/uapi/asm/svm.h +++ b/arch/x86/include/uapi/asm/svm.h@@ -115,7 +115,7 @@ #define SVM_VMGEXIT_AP_CREATE_ON_INIT 0 #define SVM_VMGEXIT_AP_CREATE 1 #define SVM_VMGEXIT_AP_DESTROY 2 -#define SVM_VMGEXIT_HYPERVISOR_FEATURES 0x8000fffd +#define SVM_VMGEXIT_HV_FT 0x8000fffd
This is fixing up commit 3 from Part1, though I think it can and should be omitted from that patch entirely since it's not relevant to the guest, only to KVM. And FWIW, I like the verbose name, though it looks like Boris requested the shorter names for the guest. Can we keep the verbose form for KVM-only VMEGXIT name? Hyper-V has mostly laid claim to "HV", and feature is not the first thing that comes to mind for "FT".
#define SVM_VMGEXIT_UNSUPPORTED_EVENT 0x8000ffff