linux-kernel - [PATCH v3 1/2] x86/mce: new Centaur CPU support MCE broadcasting

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

Date:   Wed, 25 Apr 2018 18:33:39 +0800
From:   David Wang <davidwang@...oxin.com>
To:     <bp@...en8.de>, <tony.luck@...el.com>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <hpa@...or.com>, <gregkh@...uxfoundation.org>,
        <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-edac@...r.kernel.org>
CC:     <brucechang@...-alliance.com>, <cooperyan@...oxin.com>,
        <qiyuanwang@...oxin.com>, <benjaminpan@...tech.com>,
        <lukelin@...cpu.com>, <timguo@...oxin.com>,
        David Wang <davidwang@...oxin.com>
Subject: [PATCH v3 1/2] x86/mce: new Centaur CPU support MCE broadcasting

Newer Centaur multi-core CPU also support MCE broadcasting to all cores. But
no Centaur special code tell this truth to kernel.  

Signed-off-by: David Wang <davidwang@...oxin.com>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 42cf288..38ccab8 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1727,6 +1727,22 @@ static void __mcheck_cpu_init_early(struct cpuinfo_x86 *c)
 	}
 }
 
+void mce_centaur_feature_init(struct cpuinfo_x86 *c)
+{
+	struct mca_config *cfg = &mca_cfg;
+
+	 /*
+	  * All newer Centaur CPUs support MCE broadcasting. Enable
+	  * synchronization with a one second timeout.
+	  */
+	if (cfg->monarch_timeout < 0) {
+		if ((c->x86 == 6 && c->x86_model == 0xf &&
+			c->x86_stepping >= 0xe) || c->x86 > 6)
+			cfg->monarch_timeout = USEC_PER_SEC;
+	}
+}
+
+
 static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 {
 	switch (c->x86_vendor) {
@@ -1739,6 +1755,9 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 		mce_amd_feature_init(c);
 		break;
 		}
+	case X86_VENDOR_CENTAUR:
+		mce_centaur_feature_init(c);
+		break;
 
 	default:
 		break;
-- 
1.9.1