linux-kernel - [tip: x86/sev] x86/traps: Define RMP violation #PF error code

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Message-ID: <170663196817.398.3820994161857678840.tip-bot2@tip-bot2>
Date: Tue, 30 Jan 2024 16:26:08 -0000
From: "tip-bot2 for Brijesh Singh" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Brijesh Singh <brijesh.singh@....com>, Michael Roth <michael.roth@....com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, Dave Hansen <dave.hansen@...el.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/sev] x86/traps: Define RMP violation #PF error code

The following commit has been merged into the x86/sev branch of tip:

Commit-ID:     54055344b232c917a9e492a8bf5864fed99ad6b8
Gitweb:        https://git.kernel.org/tip/54055344b232c917a9e492a8bf5864fed99ad6b8
Author:        Brijesh Singh <brijesh.singh@....com>
AuthorDate:    Thu, 25 Jan 2024 22:11:08 -06:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 29 Jan 2024 17:26:56 +01:00

x86/traps: Define RMP violation #PF error code

Bit 31 in the page fault-error bit will be set when processor encounters
an RMP violation.

While at it, use the BIT() macro.

Signed-off-by: Brijesh Singh <brijesh.singh@....com>
Signed-off-by: Michael Roth <michael.roth@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Acked-by: Dave Hansen <dave.hansen@...el.com>
Link: https://lore.kernel.org/r/20240126041126.1927228-9-michael.roth@amd.com
---
 arch/x86/include/asm/trap_pf.h | 20 ++++++++++++--------
 arch/x86/mm/fault.c            |  1 +
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/trap_pf.h b/arch/x86/include/asm/trap_pf.h
index afa5243..a23a7b7 100644
--- a/arch/x86/include/asm/trap_pf.h
+++ b/arch/x86/include/asm/trap_pf.h
@@ -2,6 +2,8 @@
 #ifndef _ASM_X86_TRAP_PF_H
 #define _ASM_X86_TRAP_PF_H
 
+#include <linux/bits.h>
+
 /*
  * Page fault error code bits:
  *
@@ -13,16 +15,18 @@
  *   bit 5 ==				1: protection keys block access
  *   bit 6 ==				1: shadow stack access fault
  *   bit 15 ==				1: SGX MMU page-fault
+ *   bit 31 ==				1: fault was due to RMP violation
  */
 enum x86_pf_error_code {
-	X86_PF_PROT	=		1 << 0,
-	X86_PF_WRITE	=		1 << 1,
-	X86_PF_USER	=		1 << 2,
-	X86_PF_RSVD	=		1 << 3,
-	X86_PF_INSTR	=		1 << 4,
-	X86_PF_PK	=		1 << 5,
-	X86_PF_SHSTK	=		1 << 6,
-	X86_PF_SGX	=		1 << 15,
+	X86_PF_PROT	=		BIT(0),
+	X86_PF_WRITE	=		BIT(1),
+	X86_PF_USER	=		BIT(2),
+	X86_PF_RSVD	=		BIT(3),
+	X86_PF_INSTR	=		BIT(4),
+	X86_PF_PK	=		BIT(5),
+	X86_PF_SHSTK	=		BIT(6),
+	X86_PF_SGX	=		BIT(15),
+	X86_PF_RMP	=		BIT(31),
 };
 
 #endif /* _ASM_X86_TRAP_PF_H */
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 679b09c..8805e2e 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -547,6 +547,7 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code, unsigned long ad
 		 !(error_code & X86_PF_PROT) ? "not-present page" :
 		 (error_code & X86_PF_RSVD)  ? "reserved bit violation" :
 		 (error_code & X86_PF_PK)    ? "protection keys violation" :
+		 (error_code & X86_PF_RMP)   ? "RMP violation" :
 					       "permissions violation");
 
 	if (!(error_code & X86_PF_USER) && user_mode(regs)) {