64 lines
2.1 KiB
Diff
64 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Wed, 20 Dec 2017 10:55:47 +0000
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Subject: [PATCH] KVM: x86: Add speculative control CPUID support for guests
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5753
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CVE-2017-5715
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Provide the guest with the speculative control CPUID related values.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit db7641e5f41cd517c4181ce90c4f9ecc93af4b2b)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/kvm/cpuid.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
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index 19adbb418443..f64502d21a89 100644
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--- a/arch/x86/kvm/cpuid.c
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+++ b/arch/x86/kvm/cpuid.c
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@@ -70,6 +70,7 @@ u64 kvm_supported_xcr0(void)
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/* These are scattered features in cpufeatures.h. */
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#define KVM_CPUID_BIT_AVX512_4VNNIW 2
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#define KVM_CPUID_BIT_AVX512_4FMAPS 3
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+#define KVM_CPUID_BIT_SPEC_CTRL 26
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#define KF(x) bit(KVM_CPUID_BIT_##x)
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int kvm_update_cpuid(struct kvm_vcpu *vcpu)
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@@ -387,7 +388,12 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
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/* cpuid 7.0.edx*/
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const u32 kvm_cpuid_7_0_edx_x86_features =
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- KF(AVX512_4VNNIW) | KF(AVX512_4FMAPS);
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+ KF(AVX512_4VNNIW) | KF(AVX512_4FMAPS) |
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+ KF(SPEC_CTRL);
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+
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+ /* cpuid 0x80000008.0.ebx */
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+ const u32 kvm_cpuid_80000008_0_ebx_x86_features =
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+ F(IBPB);
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/* all calls to cpuid_count() should be made on the same cpu */
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get_cpu();
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@@ -622,7 +628,9 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
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if (!g_phys_as)
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g_phys_as = phys_as;
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entry->eax = g_phys_as | (virt_as << 8);
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- entry->ebx = entry->edx = 0;
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+ entry->ebx &= kvm_cpuid_80000008_0_ebx_x86_features;
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+ cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX);
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+ entry->edx = 0;
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break;
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}
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case 0x80000019:
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--
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2.14.2
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