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    Subject[PATCH v11 4/4] arm64: handle NOTIFY_SEI notification by the APEI driver
    Date
    Add a helper to handle the NOTIFY_SEI notification, when kernel
    gets the NOTIFY_SEI notification, call this helper and let APEI
    driver to handle this notification.

    Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com>
    ---
    arch/arm64/include/asm/system_misc.h | 1 +
    arch/arm64/kernel/traps.c | 4 ++++
    arch/arm64/mm/fault.c | 10 ++++++++++
    3 files changed, 15 insertions(+)

    diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
    index 07aa8e3..9ee13ad 100644
    --- a/arch/arm64/include/asm/system_misc.h
    +++ b/arch/arm64/include/asm/system_misc.h
    @@ -57,6 +57,7 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
    })

    int handle_guest_sea(phys_addr_t addr, unsigned int esr);
    +int handle_guest_sei(void);

    #endif /* __ASSEMBLY__ */

    diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
    index bbb0fde..d888eb2 100644
    --- a/arch/arm64/kernel/traps.c
    +++ b/arch/arm64/kernel/traps.c
    @@ -681,6 +681,10 @@ bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr)
    {
    u32 aet = arm64_ras_serror_get_severity(esr);

    + /* The APEI driver may handle this RAS error. */
    + if (!handle_guest_sei())
    + return false;
    +
    switch (aet) {
    case ESR_ELx_AET_CE: /* corrected error */
    case ESR_ELx_AET_UEO: /* restartable, not yet consumed */
    diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
    index f76bb2c..8f29bd8 100644
    --- a/arch/arm64/mm/fault.c
    +++ b/arch/arm64/mm/fault.c
    @@ -683,6 +683,16 @@ int handle_guest_sea(phys_addr_t addr, unsigned int esr)
    return ret;
    }

    +int handle_guest_sei(void)
    +{
    + int ret = -ENOENT;
    +
    + if (IS_ENABLED(CONFIG_ACPI_APEI_SEI))
    + ret = ghes_notify_sei();
    +
    + return ret;
    +}
    +
    asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
    struct pt_regs *regs)
    {
    --
    1.9.1
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