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@xxxxxxx>
AuthorDate: Thu, 25 Jan 2024 22:11:08 -06:00
Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx>
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@xxxxxxx>
Signed-off-by: Michael Roth <michael.roth@xxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240126041126.1927228-9-michael.roth@xxxxxxx
---
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)) {
|