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From: Thomas Gleixner <tglx@linutronix.de>
To: speck@linutronix.de
Subject: [patch V2 02/10] MDS basics+ 2
Date: Wed, 20 Feb 2019 16:07:55 +0100	[thread overview]
Message-ID: <20190220151400.114717276@linutronix.de> (raw)
In-Reply-To: 20190220150753.665964899@linutronix.de

From: Andi Kleen <ak@linux.intel.com>
Subject: [patch V2 02/10] x86/kvm: Expose X86_FEATURE_MD_CLEAR to guests

X86_FEATURE_MD_CLEAR is a new CPUID bit which is set when microcode
provides the mechanism to invoke a flush of various exploitable CPU buffers
by invoking the VERW instruction.

Hand it through to guests so they can adjust their mitigations.

This also requires corresponding qemu changes, which are available
seperately.

[ tglx: Massaged changelog ]

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 arch/x86/kvm/cpuid.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -409,7 +409,8 @@ static inline int __do_cpuid_ent(struct
 	/* cpuid 7.0.edx*/
 	const u32 kvm_cpuid_7_0_edx_x86_features =
 		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
-		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP);
+		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
+		F(MD_CLEAR);
 
 	/* all calls to cpuid_count() should be made on the same cpu */
 	get_cpu();

  parent reply	other threads:[~2019-02-20 15:18 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-20 15:07 [patch V2 00/10] MDS basics+ 0 Thomas Gleixner
2019-02-20 15:07 ` [patch V2 01/10] MDS basics+ 1 Thomas Gleixner
2019-02-20 16:27   ` [MODERATED] " Borislav Petkov
2019-02-20 16:46   ` Greg KH
2019-02-20 15:07 ` Thomas Gleixner [this message]
2019-02-20 16:47   ` [MODERATED] Re: [patch V2 02/10] MDS basics+ 2 Borislav Petkov
2019-02-20 16:48   ` Greg KH
2019-02-20 15:07 ` [patch V2 03/10] MDS basics+ 3 Thomas Gleixner
2019-02-20 16:54   ` [MODERATED] " mark gross
2019-02-20 16:57     ` Thomas Gleixner
2019-02-20 18:08       ` [MODERATED] " mark gross
2019-02-20 21:40         ` Thomas Gleixner
2019-02-20 17:14   ` [MODERATED] " Borislav Petkov
2019-02-20 21:31     ` Thomas Gleixner
2019-02-21  2:12   ` [MODERATED] " Andrew Cooper
2019-02-21  9:27     ` Peter Zijlstra
2019-02-21  9:33     ` [MODERATED] " Borislav Petkov
2019-02-21 10:04     ` Thomas Gleixner
2019-02-21 10:18       ` [MODERATED] Re: " Borislav Petkov
2019-02-20 15:07 ` [patch V2 04/10] MDS basics+ 4 Thomas Gleixner
2019-02-20 16:52   ` [MODERATED] " Greg KH
2019-02-20 17:10   ` mark gross
2019-02-21 19:26     ` [MODERATED] Encrypted Message Tim Chen
2019-02-21 20:32       ` Thomas Gleixner
2019-02-21 21:07       ` [MODERATED] " Jiri Kosina
2019-02-20 18:43   ` [MODERATED] Re: [patch V2 04/10] MDS basics+ 4 Borislav Petkov
2019-02-20 19:26   ` Jiri Kosina
2019-02-20 21:42     ` Thomas Gleixner
2019-02-20 15:07 ` [patch V2 05/10] MDS basics+ 5 Thomas Gleixner
2019-02-20 20:05   ` [MODERATED] " Borislav Petkov
2019-02-21  2:24   ` Andrew Cooper
2019-02-21 10:36     ` Thomas Gleixner
2019-02-21 11:22       ` Thomas Gleixner
2019-02-21 11:51       ` [MODERATED] Attack Surface [Was [patch V2 05/10] MDS basics+ 5] Andrew Cooper
2019-02-21 18:41         ` Thomas Gleixner
2019-02-20 15:07 ` [patch V2 06/10] MDS basics+ 6 Thomas Gleixner
2019-02-21 10:18   ` [MODERATED] " Borislav Petkov
2019-02-20 15:08 ` [patch V2 07/10] MDS basics+ 7 Thomas Gleixner
2019-02-21 12:47   ` [MODERATED] " Borislav Petkov
2019-02-21 13:48     ` Thomas Gleixner
2019-02-20 15:08 ` [patch V2 08/10] MDS basics+ 8 Thomas Gleixner
2019-02-21 14:04   ` [MODERATED] " Borislav Petkov
2019-02-21 14:11     ` Thomas Gleixner
2019-02-20 15:08 ` [patch V2 09/10] MDS basics+ 9 Thomas Gleixner
2019-02-20 16:21   ` [MODERATED] " Peter Zijlstra
2019-02-20 22:32     ` Thomas Gleixner
2019-02-20 22:50       ` [MODERATED] " Jiri Kosina
2019-02-20 23:22         ` Thomas Gleixner
2019-02-21 11:04   ` [MODERATED] " Peter Zijlstra
2019-02-21 11:50     ` Peter Zijlstra
2019-02-21 14:18   ` Borislav Petkov
2019-02-21 18:00   ` Kees Cook
2019-02-21 19:46     ` Thomas Gleixner
2019-02-21 20:56       ` Thomas Gleixner
2019-02-20 15:08 ` [patch V2 10/10] MDS basics+ 10 Thomas Gleixner
2019-02-22 16:05 ` [MODERATED] Re: [patch V2 00/10] MDS basics+ 0 mark gross
2019-02-22 17:12   ` Thomas Gleixner

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