linux-kernel - [PATCH] x86, amd: Make check_c1e

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-next>] [day] [month] [year] [list]

Message-ID: <20091210133232.GA5471@alberich.amd.com>
Date:	Thu, 10 Dec 2009 14:32:33 +0100
From:	Andreas Herrmann <herrmann.der.user@...glemail.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] x86, amd: Make check_c1e_idle explicit


CC: stable@...nel.org
Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
 arch/x86/kernel/process.c |   14 ++++++--------
 1 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ea54ce8..1bf98b1 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -494,21 +494,19 @@ static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
 }
 
 /*
- * Check for AMD CPUs, which have potentially C1E support
+ * Check for AMD CPUs, which potentially use SMI or hardware initiated C1E
  */
 static int __cpuinit check_c1e_idle(const struct cpuinfo_x86 *c)
 {
 	if (c->x86_vendor != X86_VENDOR_AMD)
 		return 0;
 
-	if (c->x86 < 0x0F)
-		return 0;
-
-	/* Family 0x0f models < rev F do not have C1E */
-	if (c->x86 == 0x0f && c->x86_model < 0x40)
-		return 0;
+	if ((c->x86 == 0x0F && c->x86_model >= 0x40) ||
+	    (c->x86 == 0x10) ||
+	    (c->x86 == 0x11))
+		return 1;
 
-	return 1;
+	return 0;
 }
 
 static cpumask_var_t c1e_mask;
-- 
1.6.4.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/