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    Subject[RFC Part2 PATCH 05/30] x86: define RMP violation #PF error code
    Date
    Bit 31 in the page fault-error bit will be set when processor encounters
    an RMP violation.

    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Joerg Roedel <jroedel@suse.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Tom Lendacky <thomas.lendacky@amd.com>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Sean Christopherson <seanjc@google.com>
    Cc: x86@kernel.org
    Cc: kvm@vger.kernel.org
    Signed-off-by: Brijesh Singh <brijesh.singh@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
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