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From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: rkrcmar@redhat.com, liran.alon@oracle.com, jmattson@google.com,
	aliguori@amazon.com, thomas.lendacky@amd.com, dwmw@amazon.co.uk,
	bp@alien8.de, x86@kernel.org
Subject: [PATCH 2/8] x86/msr: add definitions for indirect branch predictor MSRs
Date: Tue,  9 Jan 2018 13:03:04 +0100	[thread overview]
Message-ID: <20180109120311.27565-3-pbonzini@redhat.com> (raw)
In-Reply-To: <20180109120311.27565-1-pbonzini@redhat.com>

These MSRs are available if the CPU features SPEC_CTRL
(CPUID(EAX=7,ECX=0).EDX[26]) is present.  The PRED_CMD MSR
is also available if the CPU feature IBPB_SUPPORT
(CPUID(EAX=0x80000008).EBX[12]) is present.

KVM will soon start using PRED_CMD and will make SPEC_CTRL
available to guests.

Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/include/asm/msr-index.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 03ffde6217d0..828a03425571 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -464,8 +464,15 @@
 #define MSR_SMI_COUNT			0x00000034
 #define MSR_IA32_FEATURE_CONTROL        0x0000003a
 #define MSR_IA32_TSC_ADJUST             0x0000003b
-#define MSR_IA32_BNDCFGS		0x00000d90
 
+#define MSR_IA32_SPEC_CTRL		0x00000048
+#define SPEC_CTRL_FEATURE_DISABLE_IBRS	(0 << 0)
+#define SPEC_CTRL_FEATURE_ENABLE_IBRS	(1 << 0)
+
+#define MSR_IA32_PRED_CMD		0x00000049
+#define PRED_CMD_IBPB			(1UL << 0)
+
+#define MSR_IA32_BNDCFGS		0x00000d90
 #define MSR_IA32_BNDCFGS_RSVD		0x00000ffc
 
 #define MSR_IA32_XSS			0x00000da0
-- 
1.8.3.1

  parent reply	other threads:[~2018-01-09 12:03 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-09 12:03 [PATCH v2 0/8] KVM: x86: expose CVE-2017-5715 ("Spectre variant 2") mitigations to guest Paolo Bonzini
2018-01-09 12:03 ` [PATCH 1/8] KVM: x86: add SPEC_CTRL and IBPB_SUPPORT accessors Paolo Bonzini
2018-01-15  9:42   ` David Hildenbrand
2018-01-09 12:03 ` Paolo Bonzini [this message]
2018-01-09 12:03 ` [PATCH 3/8] kvm: vmx: pass MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD down to the guest Paolo Bonzini
2018-01-13 10:16   ` Longpeng (Mike)
2018-01-15  9:23     ` Paolo Bonzini
2018-01-15  9:34       ` Thomas Gleixner
     [not found]   ` <1515839272.22302.520.camel@amazon.co.uk>
2018-01-15  9:23     ` Paolo Bonzini
2018-01-09 12:03 ` [PATCH 4/8] kvm: vmx: Set IBPB when running a different VCPU Paolo Bonzini
2018-01-12  1:49   ` Wanpeng Li
2018-01-12 17:03     ` Jim Mattson
2018-01-13  9:29       ` Woodhouse, David
2018-01-15  9:21         ` Paolo Bonzini
2018-01-09 12:03 ` [PATCH 5/8] KVM: SVM: fix comment Paolo Bonzini
2018-01-15  9:53   ` David Hildenbrand
2018-01-09 12:03 ` [PATCH 6/8] kvm: svm: pass MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD down to guest Paolo Bonzini
2018-01-09 14:22   ` Konrad Rzeszutek Wilk
2018-01-09 16:05     ` Paolo Bonzini
2018-01-09 16:08     ` Paolo Bonzini
2018-01-11 10:45       ` Wanpeng Li
2018-01-10 20:13   ` Tom Lendacky
2018-01-11 10:33     ` Paolo Bonzini
2018-01-09 12:03 ` [PATCH 7/8] x86/svm: Set IBPB when running a different VCPU Paolo Bonzini
2018-01-09 14:23   ` Konrad Rzeszutek Wilk
2018-01-09 12:03 ` [PATCH 8/8] KVM: x86: add SPEC_CTRL and IBPB_SUPPORT to MSR and CPUID lists Paolo Bonzini
2018-01-13  1:25   ` Eric Wheeler
2018-01-13  8:00     ` Paolo Bonzini
2018-01-16  0:40       ` Eric Wheeler
2018-01-16  7:39         ` R: " Paolo Bonzini
2018-01-09 12:03 ` [PATCH 9/8] KVM: x86: limit MSR_IA32_SPEC_CTRL access based on CPUID availability Paolo Bonzini
2018-01-16  0:55   ` Eric Wheeler
2018-01-16 12:59     ` Paolo Bonzini
2018-01-30 13:21   ` [9/8] " Mihai Carabas
2018-01-30 16:33     ` Jim Mattson
2018-01-30 16:43       ` Mihai Carabas
2018-01-30 16:57         ` Jim Mattson
2018-01-30 17:14           ` David Woodhouse
2018-01-30 17:38             ` Jim Mattson
2018-01-30 17:45             ` Thomas Gleixner
2018-01-30 23:11               ` Paolo Bonzini
2018-01-30 23:47                 ` David Woodhouse
2018-01-31  1:06                   ` Paolo Bonzini
2018-02-05 11:10                 ` Ingo Molnar
2018-02-05 11:15                   ` David Woodhouse
2018-02-05 12:10                     ` Ingo Molnar

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