KVM: x86: use general helpers for some cpuid manipulation

Add guest_cpuid_clear() and use it instead of kvm_find_cpuid_entry().
Also replace some uses of kvm_find_cpuid_entry() with guest_cpuid_has().

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index 4e9ac93..ac15193 100644 (file)
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -104,6 +104,15 @@ static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_
        return *reg & bit(x86_feature);
 }
 
+static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
+{
+       int *reg;
+
+       reg = guest_cpuid_get_register(vcpu, x86_feature);
+       if (reg)
+               *reg &= ~bit(x86_feature);
+}
+
 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
 {
        struct kvm_cpuid_entry2 *best;

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b8196ae..2432bb9 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5075,7 +5075,6 @@ static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
 static void svm_cpuid_update(struct kvm_vcpu *vcpu)
 {
        struct vcpu_svm *svm = to_svm(vcpu);
-       struct kvm_cpuid_entry2 *entry;
 
        /* Update nrips enabled cache */
        svm->nrips_enabled = !!guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);
@@ -5083,9 +5082,7 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu)
        if (!kvm_vcpu_apicv_active(vcpu))
                return;
 
-       entry = kvm_find_cpuid_entry(vcpu, 1, 0);
-       if (entry)
-               entry->ecx &= ~bit(X86_FEATURE_X2APIC);
+       guest_cpuid_clear(vcpu, X86_FEATURE_X2APIC);
 }
 
 static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 96d1f87..2c0f528 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -9636,15 +9636,13 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
 
        if (vmx_invpcid_supported()) {
                /* Exposing INVPCID only when PCID is exposed */
-               struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 0x7, 0);
                bool invpcid_enabled =
-                       best && best->ebx & bit(X86_FEATURE_INVPCID) &&
+                       guest_cpuid_has(vcpu, X86_FEATURE_INVPCID) &&
                        guest_cpuid_has(vcpu, X86_FEATURE_PCID);
 
                if (!invpcid_enabled) {
                        secondary_exec_ctl &= ~SECONDARY_EXEC_ENABLE_INVPCID;
-                       if (best)
-                               best->ebx &= ~bit(X86_FEATURE_INVPCID);
+                       guest_cpuid_clear(vcpu, X86_FEATURE_INVPCID);
                }
 
                if (nested) {

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ee4e251..33fd6b6 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1022,21 +1022,11 @@ bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
        if (efer & efer_reserved_bits)
                return false;
 
-       if (efer & EFER_FFXSR) {
-               struct kvm_cpuid_entry2 *feat;
-
-               feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
-               if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
+       if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT))
                        return false;
-       }
 
-       if (efer & EFER_SVME) {
-               struct kvm_cpuid_entry2 *feat;
-
-               feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
-               if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
+       if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM))
                        return false;
-       }
 
        return true;
 }