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    Subject[PATCHv4 09/11] KVM: SVM: Add VNMI bit definition
    Date
    VNMI exposes 3 capability bits (V_NMI, V_NMI_MASK, and V_NMI_ENABLE) to
    virtualize NMI and NMI_MASK, Those capability bits are part of
    VMCB::intr_ctrl -
    V_NMI_PENDING_MASK(11) - Indicates whether a virtual NMI is pending in the
    guest.
    V_NMI_BLOCKING_MASK(12) - Indicates whether virtual NMI is masked in the
    guest.
    V_NMI_ENABLE_MASK(26) - Enables the NMI virtualization feature for the
    guest.

    When Hypervisor wants to inject NMI, it will set V_NMI bit, Processor
    will clear the V_NMI bit and Set the V_NMI_MASK which means the Guest is
    handling NMI, After the guest handled the NMI, The processor will clear
    the V_NMI_MASK on the successful completion of IRET instruction Or if
    VMEXIT occurs while delivering the virtual NMI.

    To enable the VNMI capability, Hypervisor need to program
    V_NMI_ENABLE_MASK bit 1.

    Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
    Signed-off-by: Santosh Shukla <santosh.shukla@amd.com>
    ---
    v3:
    - Renamed V_NMI bits per Sean's v2 comment for
    better readability.
    https://lore.kernel.org/all/66f93354-22b1-a2aa-f64c-6e70b9b8063c@amd.com/

    arch/x86/include/asm/svm.h | 9 +++++++++
    1 file changed, 9 insertions(+)

    diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
    index cb1ee53ad3b1..9691081d9231 100644
    --- a/arch/x86/include/asm/svm.h
    +++ b/arch/x86/include/asm/svm.h
    @@ -183,6 +183,12 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
    #define V_GIF_SHIFT 9
    #define V_GIF_MASK (1 << V_GIF_SHIFT)

    +#define V_NMI_PENDING_SHIFT 11
    +#define V_NMI_PENDING_MASK (1 << V_NMI_PENDING_SHIFT)
    +
    +#define V_NMI_BLOCKING_SHIFT 12
    +#define V_NMI_BLOCKING_MASK (1 << V_NMI_BLOCKING_SHIFT)
    +
    #define V_INTR_PRIO_SHIFT 16
    #define V_INTR_PRIO_MASK (0x0f << V_INTR_PRIO_SHIFT)

    @@ -197,6 +203,9 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
    #define V_GIF_ENABLE_SHIFT 25
    #define V_GIF_ENABLE_MASK (1 << V_GIF_ENABLE_SHIFT)

    +#define V_NMI_ENABLE_SHIFT 26
    +#define V_NMI_ENABLE_MASK (1 << V_NMI_ENABLE_SHIFT)
    +
    #define AVIC_ENABLE_SHIFT 31
    #define AVIC_ENABLE_MASK (1 << AVIC_ENABLE_SHIFT)

    --
    2.25.1
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