Merge tag 'kvm-x86-pvunhalt-6.9' of https://github.com/kvm-x86/linux into HEAD

Fix a bug in KVM_SET_CPUID{2,} where KVM looks at the wrong CPUID entries (old
vs. new) and ultimately neglects to clear PV_UNHALT from vCPUs with HLT-exiting
disabled.

1 files changed, 26 insertions, 16 deletions

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index adba49afb5fe..bfc0bfcb2bc6 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -189,15 +189,15 @@ static int kvm_cpuid_check_equal(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2
 	return 0;
 }
 
-static struct kvm_hypervisor_cpuid kvm_get_hypervisor_cpuid(struct kvm_vcpu *vcpu,
-							    const char *sig)
+static struct kvm_hypervisor_cpuid __kvm_get_hypervisor_cpuid(struct kvm_cpuid_entry2 *entries,
+							      int nent, const char *sig)
 {
 	struct kvm_hypervisor_cpuid cpuid = {};
 	struct kvm_cpuid_entry2 *entry;
 	u32 base;
 
 	for_each_possible_hypervisor_cpuid_base(base) {
-		entry = kvm_find_cpuid_entry(vcpu, base);
+		entry = cpuid_entry2_find(entries, nent, base, KVM_CPUID_INDEX_NOT_SIGNIFICANT);
 
 		if (entry) {
 			u32 signature[3];
@@ -217,22 +217,29 @@ static struct kvm_hypervisor_cpuid kvm_get_hypervisor_cpuid(struct kvm_vcpu *vcp
 	return cpuid;
 }
 
-static struct kvm_cpuid_entry2 *__kvm_find_kvm_cpuid_features(struct kvm_vcpu *vcpu,
-					      struct kvm_cpuid_entry2 *entries, int nent)
+static struct kvm_hypervisor_cpuid kvm_get_hypervisor_cpuid(struct kvm_vcpu *vcpu,
+							    const char *sig)
 {
-	u32 base = vcpu->arch.kvm_cpuid.base;
-
-	if (!base)
-		return NULL;
+	return __kvm_get_hypervisor_cpuid(vcpu->arch.cpuid_entries,
+					  vcpu->arch.cpuid_nent, sig);
+}
 
-	return cpuid_entry2_find(entries, nent, base | KVM_CPUID_FEATURES,
+static struct kvm_cpuid_entry2 *__kvm_find_kvm_cpuid_features(struct kvm_cpuid_entry2 *entries,
+							      int nent, u32 kvm_cpuid_base)
+{
+	return cpuid_entry2_find(entries, nent, kvm_cpuid_base | KVM_CPUID_FEATURES,
 				 KVM_CPUID_INDEX_NOT_SIGNIFICANT);
 }
 
 static struct kvm_cpuid_entry2 *kvm_find_kvm_cpuid_features(struct kvm_vcpu *vcpu)
 {
-	return __kvm_find_kvm_cpuid_features(vcpu, vcpu->arch.cpuid_entries,
-					     vcpu->arch.cpuid_nent);
+	u32 base = vcpu->arch.kvm_cpuid.base;
+
+	if (!base)
+		return NULL;
+
+	return __kvm_find_kvm_cpuid_features(vcpu->arch.cpuid_entries,
+					     vcpu->arch.cpuid_nent, base);
 }
 
 void kvm_update_pv_runtime(struct kvm_vcpu *vcpu)
@@ -266,6 +273,7 @@ static void __kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu, struct kvm_cpuid_e
 				       int nent)
 {
 	struct kvm_cpuid_entry2 *best;
+	struct kvm_hypervisor_cpuid kvm_cpuid;
 
 	best = cpuid_entry2_find(entries, nent, 1, KVM_CPUID_INDEX_NOT_SIGNIFICANT);
 	if (best) {
@@ -292,10 +300,12 @@ static void __kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu, struct kvm_cpuid_e
 		     cpuid_entry_has(best, X86_FEATURE_XSAVEC)))
 		best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
 
-	best = __kvm_find_kvm_cpuid_features(vcpu, entries, nent);
-	if (kvm_hlt_in_guest(vcpu->kvm) && best &&
-		(best->eax & (1 << KVM_FEATURE_PV_UNHALT)))
-		best->eax &= ~(1 << KVM_FEATURE_PV_UNHALT);
+	kvm_cpuid = __kvm_get_hypervisor_cpuid(entries, nent, KVM_SIGNATURE);
+	if (kvm_cpuid.base) {
+		best = __kvm_find_kvm_cpuid_features(entries, nent, kvm_cpuid.base);
+		if (kvm_hlt_in_guest(vcpu->kvm) && best)
+			best->eax &= ~(1 << KVM_FEATURE_PV_UNHALT);
+	}
 
 	if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT)) {
 		best = cpuid_entry2_find(entries, nent, 0x1, KVM_CPUID_INDEX_NOT_SIGNIFICANT);