linux-kernel - [PATCH 2/3] KVM: SVM: Use sev_es_host_save_area() helper when initializing tsc

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Message-ID: <20240617210432.1642542-3-seanjc@google.com>
Date: Mon, 17 Jun 2024 14:04:31 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Borislav Petkov <bp@...en8.de>
Subject: [PATCH 2/3] KVM: SVM: Use sev_es_host_save_area() helper when
 initializing tsc_aux

Use sev_es_host_save_area() instead of open coding an equivalent when
setting the MSR_TSC_AUX field during setup.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 0a36c82b316f..cf285472fea6 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -570,6 +570,11 @@ static void __svm_write_tsc_multiplier(u64 multiplier)
 	__this_cpu_write(current_tsc_ratio, multiplier);
 }
 
+static __always_inline struct sev_es_save_area *sev_es_host_save_area(struct svm_cpu_data *sd)
+{
+	return page_address(sd->save_area) + 0x400;
+}
+
 static inline void kvm_cpu_svm_disable(void)
 {
 	uint64_t efer;
@@ -674,12 +679,9 @@ static int svm_hardware_enable(void)
 	 * TSC_AUX field now to avoid a RDMSR on every vCPU run.
 	 */
 	if (boot_cpu_has(X86_FEATURE_V_TSC_AUX)) {
-		struct sev_es_save_area *hostsa;
 		u32 __maybe_unused msr_hi;
 
-		hostsa = (struct sev_es_save_area *)(page_address(sd->save_area) + 0x400);
-
-		rdmsr(MSR_TSC_AUX, hostsa->tsc_aux, msr_hi);
+		rdmsr(MSR_TSC_AUX, sev_es_host_save_area(sd)->tsc_aux, msr_hi);
 	}
 
 	return 0;
@@ -1504,11 +1506,6 @@ static void svm_vcpu_free(struct kvm_vcpu *vcpu)
 	__free_pages(virt_to_page(svm->msrpm), get_order(MSRPM_SIZE));
 }
 
-static __always_inline struct sev_es_save_area *sev_es_host_save_area(struct svm_cpu_data *sd)
-{
-	return page_address(sd->save_area) + 0x400;
-}
-
 static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
-- 
2.45.2.627.g7a2c4fd464-goog