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authorPaolo Bonzini <pbonzini@redhat.com>2019-08-19 17:24:07 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-11-12 19:18:58 +0100
commitf570b657264ba55b336f65ab689eea096c0fef39 (patch)
treeebdc4424aacc8a037891c9f1cf1d76d7bd737675
parente78af200c633837b0ad98dd9d8612e0e5bbe83c7 (diff)
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KVM: x86: use Intel speculation bugs and features as derived in generic x86 code
commit 0c54914d0c52a15db9954a76ce80fee32cf318f4 upstream. Similar to AMD bits, set the Intel bits from the vendor-independent feature and bug flags, because KVM_GET_SUPPORTED_CPUID does not care about the vendor and they should be set on AMD processors as well. Suggested-by: Jim Mattson <jmattson@google.com> Reviewed-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/kvm/cpuid.c8
-rw-r--r--arch/x86/kvm/x86.c8
2 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 5c82b4bc4a68..33f87b696487 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -481,8 +481,16 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
/* PKU is not yet implemented for shadow paging. */
if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE))
entry->ecx &= ~F(PKU);
+
entry->edx &= kvm_cpuid_7_0_edx_x86_features;
cpuid_mask(&entry->edx, CPUID_7_EDX);
+ if (boot_cpu_has(X86_FEATURE_IBPB) &&
+ boot_cpu_has(X86_FEATURE_IBRS))
+ entry->edx |= F(SPEC_CTRL);
+ if (boot_cpu_has(X86_FEATURE_STIBP))
+ entry->edx |= F(INTEL_STIBP);
+ if (boot_cpu_has(X86_FEATURE_SSBD))
+ entry->edx |= F(SPEC_CTRL_SSBD);
/*
* We emulate ARCH_CAPABILITIES in software even
* if the host doesn't support it.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4927d0f5be13..b1e0969a4543 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1081,8 +1081,16 @@ u64 kvm_get_arch_capabilities(void)
if (l1tf_vmx_mitigation != VMENTER_L1D_FLUSH_NEVER)
data |= ARCH_CAP_SKIP_VMENTRY_L1DFLUSH;
+ if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
+ data |= ARCH_CAP_RDCL_NO;
+ if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS))
+ data |= ARCH_CAP_SSB_NO;
+ if (!boot_cpu_has_bug(X86_BUG_MDS))
+ data |= ARCH_CAP_MDS_NO;
+
return data;
}
+
EXPORT_SYMBOL_GPL(kvm_get_arch_capabilities);
static int kvm_get_msr_feature(struct kvm_msr_entry *msr)