From 4b1e84276a6172980c5bf39aa091ba13e90d6dad Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Wed, 21 Feb 2018 11:18:56 +0100 Subject: [PATCH] x86/mce/AMD: Collect error info even if valid bits are not set 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 Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Tony Luck Cc: linux-edac Link: http://lkml.kernel.org/r/20180221101900.10326-5-bp@alien8.de Signed-off-by: Ingo Molnar --- 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 d7dff234dd28..3c9a25b93538 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -441,6 +441,20 @@ 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) -- 2.11.0