linux-kernel - [PATCH v10 09/50] x86/traps: Define RMP violation #PF error code

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Message-ID: <20231016132819.1002933-10-michael.roth@amd.com>
Date:   Mon, 16 Oct 2023 08:27:38 -0500
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>,
        <linux-kernel@...r.kernel.org>, <tglx@...utronix.de>,
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        <nikunj.dadhania@....com>, <pankaj.gupta@....com>,
        <liam.merwick@...cle.com>, <zhi.a.wang@...el.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Dave Hansen <dave.hansen@...el.com>
Subject: [PATCH v10 09/50] x86/traps: Define RMP violation #PF error code

From: Brijesh Singh <brijesh.singh@....com>

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: Ashish Kalra <ashish.kalra@....com>
Acked-by: Dave Hansen <dave.hansen@...el.com>
Signed-off-by: Michael Roth <michael.roth@....com>
---
 arch/x86/include/asm/trap_pf.h | 4 ++++
 arch/x86/mm/fault.c            | 1 +
 2 files changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/trap_pf.h b/arch/x86/include/asm/trap_pf.h
index afa524325e55..136707d7a961 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>  /* BIT() macro */
+
 /*
  * Page fault error code bits:
  *
@@ -13,6 +15,7 @@
  *   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,
@@ -23,6 +26,7 @@ enum x86_pf_error_code {
 	X86_PF_PK	=		1 << 5,
 	X86_PF_SHSTK	=		1 << 6,
 	X86_PF_SGX	=		1 << 15,
+	X86_PF_RMP	=		1 << 31,
 };
 
 #endif /* _ASM_X86_TRAP_PF_H */
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index ab778eac1952..7858b9515d4a 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)) {
-- 
2.25.1