[RFC Part2 PATCH 05/30] x86: define RMP violation #PF error code

[Brijesh Singh]

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

Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Joerg Roedel <jroe...@suse.de>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: Tony Luck <tony.l...@intel.com>
Cc: Dave Hansen <dave.han...@intel.com>
Cc: "Peter Zijlstra (Intel)" <pet...@infradead.org>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: David Rientjes <rient...@google.com>
Cc: Sean Christopherson <sea...@google.com>
Cc: x...@kernel.org
Cc: k...@vger.kernel.org
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
---
 arch/x86/include/asm/trap_pf.h | 2 ++
 arch/x86/mm/fault.c            | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/include/asm/trap_pf.h b/arch/x86/include/asm/trap_pf.h
index 10b1de500ab1..107f9d947e8d 100644
--- a/arch/x86/include/asm/trap_pf.h
+++ b/arch/x86/include/asm/trap_pf.h
@@ -12,6 +12,7 @@
  *   bit 4 ==                          1: fault was an instruction fetch
  *   bit 5 ==                          1: protection keys block access
  *   bit 15 ==                         1: SGX MMU page-fault
+ *   bit 31 ==                         1: fault was an RMP violation
  */
 enum x86_pf_error_code {
        X86_PF_PROT     =               1 << 0,
@@ -21,6 +22,7 @@ enum x86_pf_error_code {
        X86_PF_INSTR    =               1 << 4,
        X86_PF_PK       =               1 << 5,
        X86_PF_SGX      =               1 << 15,
+       X86_PF_RMP      =               1ull << 31,
 };
 
 #endif /* _ASM_X86_TRAP_PF_H */
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index f1f1b5a0956a..f39b551f89a6 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)) {
-- 
2.17.1