From: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
To: <x86@kernel.org>, <linux-edac@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Cc: Tony Luck <tony.luck@intel.com>,
"H . Peter Anvin" <hpa@zytor.com>, <yazen.ghannam@amd.com>,
<Smita.KoralahalliChannabasappa@amd.com>
Subject: [PATCH v2 2/5] x86/mce/inject: Warn the user on a not set valid bit in MCA_STATUS
Date: Tue, 19 Oct 2021 18:36:38 -0500 [thread overview]
Message-ID: <20211019233641.140275-3-Smita.KoralahalliChannabasappa@amd.com> (raw)
In-Reply-To: <20211019233641.140275-1-Smita.KoralahalliChannabasappa@amd.com>
MCA handlers check the valid bit in each status register (MCA_STATUS[Val])
and will likely ignore signatures if the valid bit is not set.
Warn the user if the valid bit is not set before doing error injection.
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
---
v2:
Added a warning statement instead of setting the valid bit.
---
arch/x86/kernel/cpu/mce/inject.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/cpu/mce/inject.c b/arch/x86/kernel/cpu/mce/inject.c
index 601efd104bb4..a993dc3d0333 100644
--- a/arch/x86/kernel/cpu/mce/inject.c
+++ b/arch/x86/kernel/cpu/mce/inject.c
@@ -487,6 +487,9 @@ static void do_inject(void)
i_mce.tsc = rdtsc_ordered();
+ if (!(i_mce.status & MCI_STATUS_VAL))
+ pr_warn("Handlers might ignore signatures with Val=0 in MCA_STATUS\n");
+
if (i_mce.misc)
i_mce.status |= MCI_STATUS_MISCV;
--
2.17.1
next prev parent reply other threads:[~2021-10-19 23:37 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-19 23:36 [PATCH v2 0/5] x86/mce: Handle error injection failures in mce-inject module Smita Koralahalli
2021-10-19 23:36 ` [PATCH v2 1/5] x86/mce/inject: Check if a bank is unpopulated before error injection Smita Koralahalli
2021-10-25 13:56 ` Borislav Petkov
2021-10-25 17:09 ` Koralahalli Channabasappa, Smita
2021-12-08 11:03 ` [tip: ras/core] x86/mce/inject: Check if a bank is populated before injecting tip-bot2 for Smita Koralahalli
2021-10-19 23:36 ` Smita Koralahalli [this message]
2021-10-20 15:06 ` [PATCH v2 2/5] x86/mce/inject: Warn the user on a not set valid bit in MCA_STATUS Luck, Tony
2021-10-26 10:02 ` Borislav Petkov
2021-10-26 16:58 ` Koralahalli Channabasappa, Smita
2021-10-26 17:15 ` Borislav Petkov
2021-10-26 18:53 ` Koralahalli Channabasappa, Smita
2021-10-26 20:25 ` Borislav Petkov
2021-10-19 23:36 ` [PATCH v2 3/5] x86/mce: Use mca_msr_reg() in prepare_msrs() Smita Koralahalli
2021-10-27 11:41 ` Borislav Petkov
2021-10-27 20:19 ` Koralahalli Channabasappa, Smita
2021-10-28 8:53 ` Borislav Petkov
2021-11-01 18:51 ` Koralahalli Channabasappa, Smita
2021-10-19 23:36 ` [PATCH v2 4/5] x86/mce/inject: Check for writes ignored in status registers Smita Koralahalli
2021-10-19 23:36 ` [PATCH v2 5/5] x86/mce/mce-inject: Return error code to userspace from mce-inject module Smita Koralahalli
2021-10-20 15:18 ` Luck, Tony
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