KVM: x86: Rename kvm_{g,s}et_msr()* to show that they emulate guest accesses

Rename
	kvm_{g,s}et_msr_with_filter()
	kvm_{g,s}et_msr()
to
	kvm_emulate_msr_{read,write}
	__kvm_emulate_msr_{read,write}

to make it more obvious that KVM uses these helpers to emulate guest
behaviors, i.e., host_initiated == false in these helpers.

Suggested-by: Sean Christopherson <seanjc@google.com>
Suggested-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Tested-by: Mathias Krause <minipli@grsecurity.net>
Tested-by: John Allen <john.allen@amd.com>
Signed-off-by: Chao Gao <chao.gao@intel.com>
Tested-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Link: https://lore.kernel.org/r/20250812025606.74625-2-chao.gao@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

4 files changed, 27 insertions, 26 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 735b5d1e62dd..3f59554df6b1 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2154,11 +2154,11 @@ void kvm_prepare_event_vectoring_exit(struct kvm_vcpu *vcpu, gpa_t gpa);
 
 void kvm_enable_efer_bits(u64);
 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer);
-int kvm_get_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 *data);
-int kvm_set_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 data);
+int kvm_emulate_msr_read(struct kvm_vcpu *vcpu, u32 index, u64 *data);
+int kvm_emulate_msr_write(struct kvm_vcpu *vcpu, u32 index, u64 data);
 int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data, bool host_initiated);
-int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data);
-int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data);
+int __kvm_emulate_msr_read(struct kvm_vcpu *vcpu, u32 index, u64 *data);
+int __kvm_emulate_msr_write(struct kvm_vcpu *vcpu, u32 index, u64 data);
 int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu);
 int kvm_emulate_rdmsr_imm(struct kvm_vcpu *vcpu, u32 msr, int reg);
 int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index 9864c057187d..5dd8a1646800 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -529,7 +529,7 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
 
 	vcpu->arch.smbase =         smstate->smbase;
 
-	if (kvm_set_msr(vcpu, MSR_EFER, smstate->efer & ~EFER_LMA))
+	if (__kvm_emulate_msr_write(vcpu, MSR_EFER, smstate->efer & ~EFER_LMA))
 		return X86EMUL_UNHANDLEABLE;
 
 	rsm_load_seg_64(vcpu, &smstate->tr, VCPU_SREG_TR);
@@ -620,7 +620,7 @@ int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
 
 		/* And finally go back to 32-bit mode.  */
 		efer = 0;
-		kvm_set_msr(vcpu, MSR_EFER, efer);
+		__kvm_emulate_msr_write(vcpu, MSR_EFER, efer);
 	}
 #endif
 
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 798776dddd43..2156c9a854f4 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -997,7 +997,7 @@ static u32 nested_vmx_load_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
 				__func__, i, e.index, e.reserved);
 			goto fail;
 		}
-		if (kvm_set_msr_with_filter(vcpu, e.index, e.value)) {
+		if (kvm_emulate_msr_write(vcpu, e.index, e.value)) {
 			pr_debug_ratelimited(
 				"%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
 				__func__, i, e.index, e.value);
@@ -1033,7 +1033,7 @@ static bool nested_vmx_get_vmexit_msr_value(struct kvm_vcpu *vcpu,
 		}
 	}
 
-	if (kvm_get_msr_with_filter(vcpu, msr_index, data)) {
+	if (kvm_emulate_msr_read(vcpu, msr_index, data)) {
 		pr_debug_ratelimited("%s cannot read MSR (0x%x)\n", __func__,
 			msr_index);
 		return false;
@@ -2770,8 +2770,8 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
 
 	if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) &&
 	    kvm_pmu_has_perf_global_ctrl(vcpu_to_pmu(vcpu)) &&
-	    WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
-				     vmcs12->guest_ia32_perf_global_ctrl))) {
+	    WARN_ON_ONCE(__kvm_emulate_msr_write(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
+						 vmcs12->guest_ia32_perf_global_ctrl))) {
 		*entry_failure_code = ENTRY_FAIL_DEFAULT;
 		return -EINVAL;
 	}
@@ -4758,8 +4758,8 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
 	}
 	if ((vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) &&
 	    kvm_pmu_has_perf_global_ctrl(vcpu_to_pmu(vcpu)))
-		WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
-					 vmcs12->host_ia32_perf_global_ctrl));
+		WARN_ON_ONCE(__kvm_emulate_msr_write(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
+						     vmcs12->host_ia32_perf_global_ctrl));
 
 	/* Set L1 segment info according to Intel SDM
 	    27.5.2 Loading Host Segment and Descriptor-Table Registers */
@@ -4937,7 +4937,7 @@ static void nested_vmx_restore_host_state(struct kvm_vcpu *vcpu)
 				goto vmabort;
 			}
 
-			if (kvm_set_msr_with_filter(vcpu, h.index, h.value)) {
+			if (kvm_emulate_msr_write(vcpu, h.index, h.value)) {
 				pr_debug_ratelimited(
 					"%s WRMSR failed (%u, 0x%x, 0x%llx)\n",
 					__func__, j, h.index, h.value);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b47a6a4ced15..e1eff02f37c7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1933,33 +1933,33 @@ static int kvm_get_msr_ignored_check(struct kvm_vcpu *vcpu,
 				 __kvm_get_msr);
 }
 
-int kvm_get_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 *data)
+int kvm_emulate_msr_read(struct kvm_vcpu *vcpu, u32 index, u64 *data)
 {
 	if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ))
 		return KVM_MSR_RET_FILTERED;
 	return kvm_get_msr_ignored_check(vcpu, index, data, false);
 }
-EXPORT_SYMBOL_GPL(kvm_get_msr_with_filter);
+EXPORT_SYMBOL_GPL(kvm_emulate_msr_read);
 
-int kvm_set_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 data)
+int kvm_emulate_msr_write(struct kvm_vcpu *vcpu, u32 index, u64 data)
 {
 	if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE))
 		return KVM_MSR_RET_FILTERED;
 	return kvm_set_msr_ignored_check(vcpu, index, data, false);
 }
-EXPORT_SYMBOL_GPL(kvm_set_msr_with_filter);
+EXPORT_SYMBOL_GPL(kvm_emulate_msr_write);
 
-int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data)
+int __kvm_emulate_msr_read(struct kvm_vcpu *vcpu, u32 index, u64 *data)
 {
 	return kvm_get_msr_ignored_check(vcpu, index, data, false);
 }
-EXPORT_SYMBOL_GPL(kvm_get_msr);
+EXPORT_SYMBOL_GPL(__kvm_emulate_msr_read);
 
-int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data)
+int __kvm_emulate_msr_write(struct kvm_vcpu *vcpu, u32 index, u64 data)
 {
 	return kvm_set_msr_ignored_check(vcpu, index, data, false);
 }
-EXPORT_SYMBOL_GPL(kvm_set_msr);
+EXPORT_SYMBOL_GPL(__kvm_emulate_msr_write);
 
 static void complete_userspace_rdmsr(struct kvm_vcpu *vcpu)
 {
@@ -2040,7 +2040,8 @@ static int __kvm_emulate_rdmsr(struct kvm_vcpu *vcpu, u32 msr, int reg,
 	u64 data;
 	int r;
 
-	r = kvm_get_msr_with_filter(vcpu, msr, &data);
+	r = kvm_emulate_msr_read(vcpu, msr, &data);
+
 	if (!r) {
 		trace_kvm_msr_read(msr, data);
 
@@ -2080,7 +2081,7 @@ static int __kvm_emulate_wrmsr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 {
 	int r;
 
-	r = kvm_set_msr_with_filter(vcpu, msr, data);
+	r = kvm_emulate_msr_write(vcpu, msr, data);
 	if (!r) {
 		trace_kvm_msr_write(msr, data);
 	} else {
@@ -8366,7 +8367,7 @@ static int emulator_get_msr_with_filter(struct x86_emulate_ctxt *ctxt,
 	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
 	int r;
 
-	r = kvm_get_msr_with_filter(vcpu, msr_index, pdata);
+	r = kvm_emulate_msr_read(vcpu, msr_index, pdata);
 	if (r < 0)
 		return X86EMUL_UNHANDLEABLE;
 
@@ -8389,7 +8390,7 @@ static int emulator_set_msr_with_filter(struct x86_emulate_ctxt *ctxt,
 	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
 	int r;
 
-	r = kvm_set_msr_with_filter(vcpu, msr_index, data);
+	r = kvm_emulate_msr_write(vcpu, msr_index, data);
 	if (r < 0)
 		return X86EMUL_UNHANDLEABLE;
 
@@ -8409,7 +8410,7 @@ static int emulator_set_msr_with_filter(struct x86_emulate_ctxt *ctxt,
 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
 			    u32 msr_index, u64 *pdata)
 {
-	return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
+	return __kvm_emulate_msr_read(emul_to_vcpu(ctxt), msr_index, pdata);
 }
 
 static int emulator_check_rdpmc_early(struct x86_emulate_ctxt *ctxt, u32 pmc)