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