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    Subject[PATCH v12 05/29] KVM: x86: Define RMP page fault error bits for #NPF
    Date
    From: Brijesh Singh <brijesh.singh@amd.com>

    When SEV-SNP is enabled globally, the hardware places restrictions on
    all memory accesses based on the RMP entry, whether the hypervisor or a
    VM, performs the accesses. When hardware encounters an RMP access
    violation during a guest access, it will cause a #VMEXIT(NPF) with a
    number of additional bits set to indicate the reasons for the #NPF.
    Define those here.

    See APM2 section 16.36.10 for more details.

    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
    [mdr: add some additional details to commit message]
    Signed-off-by: Michael Roth <michael.roth@amd.com>
    ---
    arch/x86/include/asm/kvm_host.h | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index 90dc0ae9311a..a3f8eba8d8b6 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -262,9 +262,12 @@ enum x86_intercept_stage;
    #define PFERR_FETCH_BIT 4
    #define PFERR_PK_BIT 5
    #define PFERR_SGX_BIT 15
    +#define PFERR_GUEST_RMP_BIT 31
    #define PFERR_GUEST_FINAL_BIT 32
    #define PFERR_GUEST_PAGE_BIT 33
    #define PFERR_GUEST_ENC_BIT 34
    +#define PFERR_GUEST_SIZEM_BIT 35
    +#define PFERR_GUEST_VMPL_BIT 36
    #define PFERR_IMPLICIT_ACCESS_BIT 48

    #define PFERR_PRESENT_MASK BIT(PFERR_PRESENT_BIT)
    @@ -277,7 +280,10 @@ enum x86_intercept_stage;
    #define PFERR_GUEST_FINAL_MASK BIT_ULL(PFERR_GUEST_FINAL_BIT)
    #define PFERR_GUEST_PAGE_MASK BIT_ULL(PFERR_GUEST_PAGE_BIT)
    #define PFERR_GUEST_ENC_MASK BIT_ULL(PFERR_GUEST_ENC_BIT)
    +#define PFERR_GUEST_RMP_MASK BIT_ULL(PFERR_GUEST_RMP_BIT)
    +#define PFERR_GUEST_SIZEM_MASK BIT_ULL(PFERR_GUEST_SIZEM_BIT)
    #define PFERR_IMPLICIT_ACCESS BIT_ULL(PFERR_IMPLICIT_ACCESS_BIT)
    +#define PFERR_GUEST_VMPL_MASK BIT_ULL(PFERR_GUEST_VMPL_BIT)

    #define PFERR_NESTED_GUEST_PAGE (PFERR_GUEST_PAGE_MASK | \
    PFERR_WRITE_MASK | \
    --
    2.25.1

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