KVM: SVM: remove uneeded fields from host_save_users_msrs

Now that the set of host user MSRs that need to be individually
saved/restored are the same with/without SEV-ES, we can drop the
.sev_es_restored flag and just iterate through the list unconditionally
for both cases. A subsequent patch can then move these loops to a
common path.
Signed-off-by: Michael Roth <michael.roth@amd.com>
Message-Id: <20210202190126.2185715-3-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm/sev.c

@@ -2083,12 +2083,8 @@ void sev_es_vcpu_load(struct vcpu_svm *svm, int cpu)
 	 * Certain MSRs are restored on VMEXIT, only save ones that aren't
 	 * restored.
 	 */
-	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) {
-		if (host_save_user_msrs[i].sev_es_restored)
-			continue;
-
-		rdmsrl(host_save_user_msrs[i].index, svm->host_user_msrs[i]);
-	}
+	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
+		rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
 
 	/* XCR0 is restored on VMEXIT, save the current host value */
 	hostsa = (struct vmcb_save_area *)(page_address(sd->save_area) + 0x400);
@@ -2109,12 +2105,8 @@ void sev_es_vcpu_put(struct vcpu_svm *svm)
 	 * Certain MSRs are restored on VMEXIT and were saved with vmsave in
 	 * sev_es_vcpu_load() above. Only restore ones that weren't.
 	 */
-	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) {
-		if (host_save_user_msrs[i].sev_es_restored)
-			continue;
-
-		wrmsrl(host_save_user_msrs[i].index, svm->host_user_msrs[i]);
-	}
+	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
+		wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
 }
 
 void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)

arch/x86/kvm/svm/svm.c

@@ -1428,8 +1428,7 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		sev_es_vcpu_load(svm, cpu);
 	} else {
 		for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
-			rdmsrl(host_save_user_msrs[i].index,
-			       svm->host_user_msrs[i]);
+			rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
 
 		vmsave(__sme_page_pa(sd->save_area));
 	}
@@ -1464,8 +1463,7 @@ static void svm_vcpu_put(struct kvm_vcpu *vcpu)
 		sev_es_vcpu_put(svm);
 	} else {
 		for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
-			wrmsrl(host_save_user_msrs[i].index,
-			       svm->host_user_msrs[i]);
+			wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
 	}
 }
 

arch/x86/kvm/svm/svm.h

@@ -23,11 +23,8 @@
 
 #define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT)
 
-static const struct svm_host_save_msrs {
-	u32 index;		/* Index of the MSR */
-	bool sev_es_restored;	/* True if MSR is restored on SEV-ES VMEXIT */
-} host_save_user_msrs[] = {
-	{ .index = MSR_TSC_AUX,			.sev_es_restored = false },
+static const u32 host_save_user_msrs[] = {
+	MSR_TSC_AUX,
 };
 #define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)