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authorTony Luck <tony.luck@intel.com>2019-07-18 11:29:20 -0700
committerBorislav Petkov <bp@suse.de>2019-08-05 09:34:02 +0200
commitaaefca8e30d9df7a4ca13c9c8e135dd227b8ff19 (patch)
tree156b0df969b6694c513bc11ba6998ae95b66ecdd /drivers/ras
parente21a712a9685488f5ce80495b37b9fdbe96c230d (diff)
downloadlinux-aaefca8e30d9df7a4ca13c9c8e135dd227b8ff19.tar.bz2
x86/mce: Don't check for the overflow bit on action optional machine checks
We currently do not process SRAO (Software Recoverable Action Optional) machine checks if they are logged with the overflow bit set to 1 in the machine check bank status register. This is overly conservative. There are two cases where we could end up with an SRAO+OVER log based on the SDM volume 3 overwrite rules in "Table 15-8. Overwrite Rules for UC, CE, and UCR Errors" 1) First a corrected error is logged, then the SRAO error overwrites. The second error overwrites the first because uncorrected errors have a higher severity than corrected errors. 2) The SRAO error was logged first, followed by a correcetd error. In this case the first error is retained in the bank. So in either case the machine check bank will contain the address of the SRAO error. So we can process that even if the overflow bit was set. Reported-by: Yongkai Wu <yongkaiwu@tencent.com> Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-edac <linux-edac@vger.kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190718182920.32621-1-tony.luck@intel.com
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