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From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: bp@alien8.de, hpa@zytor.com, tglx@linutronix.de,
	mingo@redhat.com, rusty@rustcorp.com.au
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	luto@amacapital.net, boris.ostrovsky@oracle.com,
	david.vrabel@citrix.com, konrad.wilk@oracle.com,
	xen-devel@lists.xensource.com, lguest@lists.ozlabs.org,
	andriy.shevchenko@linux.intel.com, jlee@suse.com, glin@suse.com,
	matt@codeblueprint.co.uk, andrew.cooper3@citrix.com,
	"Luis R. Rodriguez" <mcgrof@kernel.org>
Subject: [PATCH v4 10/14] x86/cpu/intel: remove not needed paravirt_enabled() for f00f work around
Date: Wed,  6 Apr 2016 17:06:30 -0700	[thread overview]
Message-ID: <1459987594-5434-11-git-send-email-mcgrof@kernel.org> (raw)
In-Reply-To: <1459987594-5434-1-git-send-email-mcgrof@kernel.org>

The X86_BUG_F00F work around is responsible for fixing up the error
generated on attempted F00F exploitation from an OOPS to a SIGILL.
There is no reason why this code should not be allowed to run on
PV guest on a F00F-affected CPU -- it would simply never trigger.
The pv_enabled() check was there only to avoid printing the f00f
workaround, so removing the check is purely a cosmetic change.

Suggested-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 arch/x86/kernel/cpu/intel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index f71a34944b56..66509285ffdd 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -233,7 +233,7 @@ static void intel_workarounds(struct cpuinfo_x86 *c)
 	 * The Quark is also family 5, but does not have the same bug.
 	 */
 	clear_cpu_bug(c, X86_BUG_F00F);
-	if (!paravirt_enabled() && c->x86 == 5 && c->x86_model < 9) {
+	if (c->x86 == 5 && c->x86_model < 9) {
 		static int f00f_workaround_enabled;
 
 		set_cpu_bug(c, X86_BUG_F00F);
-- 
2.7.2

WARNING: multiple messages have this Message-ID (diff)
From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: bp@alien8.de, hpa@zytor.com, tglx@linutronix.de,
	mingo@redhat.com, rusty@rustcorp.com.au
Cc: xen-devel@lists.xensource.com, matt@codeblueprint.co.uk,
	andrew.cooper3@citrix.com, x86@kernel.org,
	linux-kernel@vger.kernel.org, luto@amacapital.net, jlee@suse.com,
	"Luis R. Rodriguez" <mcgrof@kernel.org>,
	lguest@lists.ozlabs.org, glin@suse.com, david.vrabel@citrix.com,
	boris.ostrovsky@oracle.com, andriy.shevchenko@linux.intel.com
Subject: [PATCH v4 10/14] x86/cpu/intel: remove not needed paravirt_enabled() for f00f work around
Date: Wed,  6 Apr 2016 17:06:30 -0700	[thread overview]
Message-ID: <1459987594-5434-11-git-send-email-mcgrof@kernel.org> (raw)
In-Reply-To: <1459987594-5434-1-git-send-email-mcgrof@kernel.org>

The X86_BUG_F00F work around is responsible for fixing up the error
generated on attempted F00F exploitation from an OOPS to a SIGILL.
There is no reason why this code should not be allowed to run on
PV guest on a F00F-affected CPU -- it would simply never trigger.
The pv_enabled() check was there only to avoid printing the f00f
workaround, so removing the check is purely a cosmetic change.

Suggested-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 arch/x86/kernel/cpu/intel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index f71a34944b56..66509285ffdd 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -233,7 +233,7 @@ static void intel_workarounds(struct cpuinfo_x86 *c)
 	 * The Quark is also family 5, but does not have the same bug.
 	 */
 	clear_cpu_bug(c, X86_BUG_F00F);
-	if (!paravirt_enabled() && c->x86 == 5 && c->x86_model < 9) {
+	if (c->x86 == 5 && c->x86_model < 9) {
 		static int f00f_workaround_enabled;
 
 		set_cpu_bug(c, X86_BUG_F00F);
-- 
2.7.2


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  parent reply	other threads:[~2016-04-07  0:08 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-07  0:06 [PATCH v4 00/14] x86: remove paravirt_enabled Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 01/14] x86/boot: enumerate documentation for the x86 hardware_subarch Luis R. Rodriguez
2016-04-07 11:25   ` Andy Shevchenko
2016-04-07 22:36     ` Luis R. Rodriguez
2016-04-07 22:36       ` Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 02/14] x86/xen: use X86_SUBARCH_XEN for PV guest boots Luis R. Rodriguez
2016-04-07  0:06   ` Luis R. Rodriguez
2016-04-07  9:41   ` [Xen-devel] " David Vrabel
2016-04-07  9:41     ` David Vrabel
2016-04-07  0:06 ` [PATCH v4 03/14] tools/lguest: make lguest launcher use X86_SUBARCH_LGUEST explicitly Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 04/14] x86/rtc: replace paravirt rtc check with platform legacy quirk Luis R. Rodriguez
2016-04-07  0:06   ` Luis R. Rodriguez
2016-04-07  9:42   ` [Xen-devel] " David Vrabel
2016-04-07  9:42     ` David Vrabel
2016-04-13 23:08     ` Luis R. Rodriguez
2016-04-07 12:55   ` Boris Ostrovsky
2016-04-07 12:55     ` Boris Ostrovsky
2016-04-08  0:32     ` Luis R. Rodriguez
2016-04-08  5:18       ` Juergen Gross
2016-04-08  6:29         ` Luis R. Rodriguez
2016-04-08  6:29           ` Luis R. Rodriguez
2016-04-08  6:38           ` Juergen Gross
2016-04-08  6:38             ` Juergen Gross
2016-04-08  6:56             ` Luis R. Rodriguez
2016-04-08  6:56               ` Luis R. Rodriguez
2016-04-08  7:13               ` Juergen Gross
2016-04-08  7:13                 ` Juergen Gross
2016-04-08  7:36                 ` Luis R. Rodriguez
2016-04-08  7:36                   ` Luis R. Rodriguez
2016-04-08  7:59                   ` Juergen Gross
2016-04-08  7:59                     ` Juergen Gross
2016-04-08 12:37                     ` Boris Ostrovsky
2016-04-08 12:37                       ` Boris Ostrovsky
2016-04-08 18:45                       ` Luis R. Rodriguez
2016-04-08 18:45                         ` Luis R. Rodriguez
2016-04-08 12:25           ` Boris Ostrovsky
2016-04-08 12:25             ` Boris Ostrovsky
2016-04-07  0:06 ` [PATCH v4 05/14] x86, ACPI: move ACPI_FADT_NO_CMOS_RTC check to ACPI boot code Luis R. Rodriguez
2016-04-07  0:06   ` Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 06/14] x86/init: use a platform legacy quirk for ebda Luis R. Rodriguez
2016-04-07  0:06   ` Luis R. Rodriguez
2016-04-07  9:44   ` [Xen-devel] " David Vrabel
2016-04-07  9:44     ` David Vrabel
2016-04-07 21:07     ` Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 07/14] tools/lguest: force disable tboot and apm Luis R. Rodriguez
2016-04-11  3:32   ` Rusty Russell
2016-04-11  3:32     ` Rusty Russell
2016-04-07  0:06 ` [PATCH v4 08/14] apm32: remove paravirt_enabled() use Luis R. Rodriguez
2016-04-07  0:06   ` Luis R. Rodriguez
2016-04-07 13:08   ` Boris Ostrovsky
2016-04-07 22:31     ` Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 09/14] x86/tboot: remove paravirt_enabled() Luis R. Rodriguez
2016-04-07  0:06 ` Luis R. Rodriguez [this message]
2016-04-07  0:06   ` [PATCH v4 10/14] x86/cpu/intel: remove not needed paravirt_enabled() for f00f work around Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 11/14] pnpbios: replace paravirt_enabled() check with legacy device check Luis R. Rodriguez
2016-04-07  9:46   ` [Xen-devel] " David Vrabel
2016-04-07  9:46     ` David Vrabel
2016-04-07 21:42     ` Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 12/14] x86, ACPI: parse ACPI_FADT_LEGACY_DEVICES Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 13/14] x86/init: rename ebda code file Luis R. Rodriguez
2016-04-07  0:06   ` Luis R. Rodriguez
2016-04-07  0:06 ` [PATCH v4 14/14] x86/paravirt: remove paravirt_enabled() Luis R. Rodriguez
2016-04-07 13:24 ` [Xen-devel] [PATCH v4 00/14] x86: remove paravirt_enabled Juergen Gross
2016-04-07 21:31 ` [PATCH v4 13/14] x86/init: rename ebda code file Luis R. Rodriguez
2016-04-08  1:14 ` [PATCH v4 00/14] x86: remove paravirt_enabled Luis R. Rodriguez
2016-04-08 10:23   ` Borislav Petkov

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