linux-kernel - [tip: ras/core] x86/mce/amd: Define threshold restart function for banks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <175758653133.709179.16801874345100038068.tip-bot2@tip-bot2>
Date: Thu, 11 Sep 2025 10:28:51 -0000
From: "tip-bot2 for Yazen Ghannam" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Yazen Ghannam <yazen.ghannam@....com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: ras/core] x86/mce/amd: Define threshold restart function for banks

The following commit has been merged into the ras/core branch of tip:

Commit-ID:     5a92e88ffc49c383472f4b686d1bbe89e7b33cf3
Gitweb:        https://git.kernel.org/tip/5a92e88ffc49c383472f4b686d1bbe89e7b33cf3
Author:        Yazen Ghannam <yazen.ghannam@....com>
AuthorDate:    Mon, 08 Sep 2025 15:40:42 
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Thu, 11 Sep 2025 12:23:49 +02:00

x86/mce/amd: Define threshold restart function for banks

Prepare for CMCI storm support by moving the common bank/block iterator code
to a helper function.

Include a parameter to switch the interrupt enable. This will be used by
the CMCI storm handling function.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/20250908-wip-mca-updates-v6-0-eef5d6c74b9c@amd.com
---
 arch/x86/kernel/cpu/mce/amd.c | 37 +++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 9ca4079..fbdb0ce 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -471,6 +471,24 @@ static void threshold_restart_block(void *_tr)
 	wrmsr(tr->b->address, lo, hi);
 }
 
+static void threshold_restart_bank(unsigned int bank, bool intr_en)
+{
+	struct threshold_bank **thr_banks = this_cpu_read(threshold_banks);
+	struct threshold_block *block, *tmp;
+	struct thresh_restart tr;
+
+	if (!thr_banks || !thr_banks[bank])
+		return;
+
+	memset(&tr, 0, sizeof(tr));
+
+	list_for_each_entry_safe(block, tmp, &thr_banks[bank]->miscj, miscj) {
+		tr.b = block;
+		tr.b->interrupt_enable = intr_en;
+		threshold_restart_block(&tr);
+	}
+}
+
 static void mce_threshold_block_init(struct threshold_block *b, int offset)
 {
 	struct thresh_restart tr = {
@@ -814,24 +832,7 @@ static void amd_deferred_error_interrupt(void)
 
 static void amd_reset_thr_limit(unsigned int bank)
 {
-	struct threshold_bank **bp = this_cpu_read(threshold_banks);
-	struct threshold_block *block, *tmp;
-	struct thresh_restart tr;
-
-	/*
-	 * Validate that the threshold bank has been initialized already. The
-	 * handler is installed at boot time, but on a hotplug event the
-	 * interrupt might fire before the data has been initialized.
-	 */
-	if (!bp || !bp[bank])
-		return;
-
-	memset(&tr, 0, sizeof(tr));
-
-	list_for_each_entry_safe(block, tmp, &bp[bank]->miscj, miscj) {
-		tr.b = block;
-		threshold_restart_block(&tr);
-	}
+	threshold_restart_bank(bank, true);
 }
 
 /*