From: Borislav Petkov <[email protected]> The MCA banks log error info into MCA_ADDR, MCA_MISC0, and MCA_SYND even if the corresponding valid bits are not set:
"Error handlers should save the values in MCA_ADDR, MCA_MISC0, and MCA_SYND even if MCA_STATUS[AddrV], MCA_STATUS[MiscV], and MCA_STATUS[SyndV] are zero." Do so by setting those bits so that code down the MCE processing path doesn't need to be changed. Signed-off-by: Borislav Petkov <[email protected]> --- arch/x86/kernel/cpu/mcheck/mce.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index b16b184d90c5..dd713335f5d9 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -437,6 +437,20 @@ static inline void mce_gather_info(struct mce *m, struct pt_regs *regs) if (mca_cfg.rip_msr) m->ip = mce_rdmsrl(mca_cfg.rip_msr); } + + /* + * Error handlers should save the values in MCA_ADDR, MCA_MISC0, and + * MCA_SYND even if MCA_STATUS[AddrV], MCA_STATUS[MiscV], and + * MCA_STATUS[SyndV] are zero. + */ + if (m->cpuvendor == X86_VENDOR_AMD) { + u64 status = MCI_STATUS_ADDRV | MCI_STATUS_MISCV; + + if (mce_flags.smca) + status |= MCI_STATUS_SYNDV; + + m->status |= status; + } } int mce_available(struct cpuinfo_x86 *c) -- 2.13.0
