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From: Tony Luck <>
To: Borislav Petkov <>
Cc: Tony Luck <>,,,
Subject: [PATCH] x86/mce: Include a MCi_MISC value in faked mce logs
Date: Thu, 27 May 2021 15:28:46 -0700	[thread overview]
Message-ID: <> (raw)

When BIOS reports memory errors to Linux using the ACPI/APEI
error reporting method Linux creates a "struct mce" to pass
to the normal reporting code path.

The constructed record doesn't include a value for the "misc"
field of the structure, and so mce_usable_address() says this
record doesn't include a valid address.

Net result is that functions like uc_decode_notifier() will
just ignore this record instead of taking action to offline
a page.

Signed-off-by: Tony Luck <>
 arch/x86/kernel/cpu/mce/apei.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mce/apei.c b/arch/x86/kernel/cpu/mce/apei.c
index b58b85380ddb..0e3ae64d3b76 100644
--- a/arch/x86/kernel/cpu/mce/apei.c
+++ b/arch/x86/kernel/cpu/mce/apei.c
@@ -36,7 +36,8 @@ void apei_mce_report_mem_error(int severity, struct cper_sec_mem_err *mem_err)
 	mce_setup(&m); = -1;
 	/* Fake a memory read error with unknown channel */
+	m.misc = (MCI_MISC_ADDR_PHYS << 6) | PAGE_SHIFT;
 	if (severity >= GHES_SEV_RECOVERABLE)
 		m.status |= MCI_STATUS_UC;

                 reply	other threads:[~2021-05-27 22:28 UTC|newest]

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