KVM: x86: Hoist kvm_dirty_regs check out of sync_regs()

Move the kvm_dirty_regs vs. KVM_SYNC_X86_VALID_FIELDS check out of
sync_regs() and into its sole caller, kvm_arch_vcpu_ioctl_run().  This
allows a future patch to allow synchronizing select state for protected
VMs.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <889017a8d31cea46472e0c64b234ef5919278ed9.1625186503.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/x86.c

@@ -9980,7 +9980,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 		goto out;
 	}
 
-	if (kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) {
+	if ((kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) ||
+	    (kvm_run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS)) {
 		r = -EINVAL;
 		goto out;
 	}
@@ -10585,9 +10586,6 @@ static void store_regs(struct kvm_vcpu *vcpu)
 
 static int sync_regs(struct kvm_vcpu *vcpu)
 {
-	if (vcpu->run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS)
-		return -EINVAL;
-
 	if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_REGS) {
 		__set_regs(vcpu, &vcpu->run->s.regs.regs);
 		vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_REGS;