KVM: x86: Define more SEV+ page fault error bits/flags for #NPF

Define more #NPF error code flags that are relevant to SEV+ (mostly SNP)
guests, as specified by the APM:

 * Bit 31 (RMP):   Set to 1 if the fault was caused due to an RMP check or a
                   VMPL check failure, 0 otherwise.
 * Bit 34 (ENC):   Set to 1 if the guest’s effective C-bit was 1, 0 otherwise.
 * Bit 35 (SIZEM): Set to 1 if the fault was caused by a size mismatch between
                   PVALIDATE or RMPADJUST and the RMP, 0 otherwise.
 * Bit 36 (VMPL):  Set to 1 if the fault was caused by a VMPL permission
                   check failure, 0 otherwise.

Note, the APM is *extremely* misleading, and strongly implies that the
above flags can _only_ be set for #NPF exits from SNP guests.  That is a
lie, as bit 34 (C-bit=1, i.e. was encrypted) can be set when running _any_
flavor of SEV guest on SNP capable hardware.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20240228024147.41573-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 065beb3b35398fe41f20cca75ae3cddbda1b9e23..1be4608669ea9ee450bf9f4cd0e8fe17902ba428 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -261,8 +261,12 @@ enum x86_intercept_stage;
 #define PFERR_FETCH_MASK       BIT(4)
 #define PFERR_PK_MASK          BIT(5)
 #define PFERR_SGX_MASK         BIT(15)
+#define PFERR_GUEST_RMP_MASK   BIT_ULL(31)
 #define PFERR_GUEST_FINAL_MASK BIT_ULL(32)
 #define PFERR_GUEST_PAGE_MASK  BIT_ULL(33)
+#define PFERR_GUEST_ENC_MASK   BIT_ULL(34)
+#define PFERR_GUEST_SIZEM_MASK BIT_ULL(35)
+#define PFERR_GUEST_VMPL_MASK  BIT_ULL(36)
 #define PFERR_IMPLICIT_ACCESS  BIT_ULL(48)
 
 #define PFERR_NESTED_GUEST_PAGE (PFERR_GUEST_PAGE_MASK |       \