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    SubjectRe: [RFC PATCH v2 04/32] KVM: SVM: Add SEV feature definitions to KVM
    On Thu, Mar 02, 2017 at 10:12:48AM -0500, Brijesh Singh wrote:
    > From: Tom Lendacky <thomas.lendacky@amd.com>
    >
    > Define a new KVM CPU feature for Secure Encrypted Virtualization (SEV).
    > The kernel will check for the presence of this feature to determine if
    > it is running with SEV active.
    >
    > Define the SEV enable bit for the VMCB control structure. The hypervisor
    > will use this bit to enable SEV in the guest.
    >
    > Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
    > ---
    > arch/x86/include/asm/svm.h | 1 +
    > arch/x86/include/uapi/asm/kvm_para.h | 1 +
    > 2 files changed, 2 insertions(+)
    >
    > diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
    > index 2aca535..fba2a7b 100644
    > --- a/arch/x86/include/asm/svm.h
    > +++ b/arch/x86/include/asm/svm.h
    > @@ -137,6 +137,7 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
    > #define SVM_VM_CR_SVM_DIS_MASK 0x0010ULL
    >
    > #define SVM_NESTED_CTL_NP_ENABLE BIT(0)
    > +#define SVM_NESTED_CTL_SEV_ENABLE BIT(1)
    >
    > struct __attribute__ ((__packed__)) vmcb_seg {
    > u16 selector;
    > diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h
    > index 1421a65..bc2802f 100644
    > --- a/arch/x86/include/uapi/asm/kvm_para.h
    > +++ b/arch/x86/include/uapi/asm/kvm_para.h
    > @@ -24,6 +24,7 @@
    > #define KVM_FEATURE_STEAL_TIME 5
    > #define KVM_FEATURE_PV_EOI 6
    > #define KVM_FEATURE_PV_UNHALT 7
    > +#define KVM_FEATURE_SEV 8

    This looks like it needs documenting in Documentation/virtual/kvm/cpuid.txt

    --
    Regards/Gruss,
    Boris.

    SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
    --

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