KVM: x86: Drop explicit @func param from ->set_supported_cpuid()

Drop the explicit @func param from ->set_supported_cpuid() and instead
pull the CPUID function from the relevant entry.  This sets the stage
for hardening guest CPUID updates in future patches, e.g. allows adding
run-time assertions that the CPUID feature being changed is actually
a bit in the referenced CPUID entry.

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f817ddf..626cbe1 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1161,7 +1161,7 @@ struct kvm_x86_ops {
 
        void (*set_tdp_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 
-       void (*set_supported_cpuid)(u32 func, struct kvm_cpuid_entry2 *entry);
+       void (*set_supported_cpuid)(struct kvm_cpuid_entry2 *entry);
 
        bool (*has_wbinvd_exit)(void);
 

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index c194e49..ffcf647 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -784,7 +784,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
                break;
        }
 
-       kvm_x86_ops->set_supported_cpuid(function, entry);
+       kvm_x86_ops->set_supported_cpuid(entry);
 
        r = 0;
 

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 7521f72..46d9b8e 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6035,9 +6035,9 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu)
 
 #define F feature_bit
 
-static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
+static void svm_set_supported_cpuid(struct kvm_cpuid_entry2 *entry)
 {
-       switch (func) {
+       switch (entry->function) {
        case 0x80000001:
                if (nested)
                        entry->ecx |= (1 << 2); /* Set SVM bit */

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 59571cd..082ccef 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7128,9 +7128,9 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
        }
 }
 
-static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
+static void vmx_set_supported_cpuid(struct kvm_cpuid_entry2 *entry)
 {
-       if (func == 1 && nested)
+       if (entry->function == 1 && nested)
                entry->ecx |= feature_bit(VMX);
 }