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    Subject[PATCH v10 09/50] x86/traps: Define RMP violation #PF error code
    Date
    From: Brijesh Singh <brijesh.singh@amd.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@amd.com>
    Signed-off by: Ashish Kalra <ashish.kalra@amd.com>
    Acked-by: Dave Hansen <dave.hansen@intel.com>
    Signed-off-by: Michael Roth <michael.roth@amd.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
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