linux-kernel - [PATCH v11 08/35] KVM: x86: Define RMP page fault error bits for #NPF

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Date: Sat, 30 Dec 2023 11:23:24 -0600
From: Michael Roth <michael.roth@....com>
To: <kvm@...r.kernel.org>
CC: <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
	<linux-crypto@...r.kernel.org>, <x86@...nel.org>,
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	<pankaj.gupta@....com>, <liam.merwick@...cle.com>, <zhi.a.wang@...el.com>,
	Brijesh Singh <brijesh.singh@....com>
Subject: [PATCH v11 08/35] KVM: x86: Define RMP page fault error bits for #NPF

From: Brijesh Singh <brijesh.singh@....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@....com>
Signed-off-by: Ashish Kalra <ashish.kalra@....com>
[mdr: add some additional details to commit message]
Signed-off-by: Michael Roth <michael.roth@....com>
---
 arch/x86/include/asm/kvm_host.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e38cab5dccae..843695217b4b 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -262,9 +262,13 @@ 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_IMPLICIT_ACCESS_BIT 48
+#define PFERR_GUEST_ENC_BIT 34
+#define PFERR_GUEST_SIZEM_BIT 35
+#define PFERR_GUEST_VMPL_BIT 36
 
 #define PFERR_PRESENT_MASK	BIT(PFERR_PRESENT_BIT)
 #define PFERR_WRITE_MASK	BIT(PFERR_WRITE_BIT)
@@ -276,6 +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_IMPLICIT_ACCESS	BIT_ULL(PFERR_IMPLICIT_ACCESS_BIT)
+#define PFERR_GUEST_RMP_MASK	BIT_ULL(PFERR_GUEST_RMP_BIT)
+#define PFERR_GUEST_ENC_MASK	BIT_ULL(PFERR_GUEST_ENC_BIT)
+#define PFERR_GUEST_SIZEM_MASK	BIT_ULL(PFERR_GUEST_SIZEM_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