[PATCH v9 09/27] KVM: x86: Rename kvm_{g,s}et_msr() to menifest emulation operations

Yang Weijiang
2024-01-24T02:42:37Z

Rename kvm_{g,s}et_msr() to 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>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 4 ++--
arch/x86/kvm/smm.c | 4 ++--
arch/x86/kvm/vmx/nested.c | 13 +++++++------
arch/x86/kvm/x86.c | 10 +++++-----
4 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 7bc1daf68741..5c665165024c 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2013,8 +2013,8 @@ void kvm_prepare_emulation_failure_exit(struct kvm_vcpu *vcpu);
void kvm_enable_efer_bits(u64);
bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer);
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_wrmsr(struct kvm_vcpu *vcpu);
int kvm_emulate_as_nop(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index dc3d95fdca7d..45c855389ea7 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -535,7 +535,7 @@ 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);
@@ -626,7 +626,7 @@ 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 db0ad1e6ec4b..b2e9853584b8 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -958,7 +958,7 @@ 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(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);
@@ -994,7 +994,7 @@ static bool nested_vmx_get_vmexit_msr_value(struct kvm_vcpu *vcpu,
}
}

- if (kvm_get_msr(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;
@@ -2686,7 +2686,7 @@ 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,
+ 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;
@@ -4568,8 +4568,9 @@ 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 */
@@ -4744,7 +4745,7 @@ static void nested_vmx_restore_host_state(struct kvm_vcpu *vcpu)
goto vmabort;
}

- if (kvm_set_msr(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 27e23714e960..0e7dc3398293 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1976,17 +1976,17 @@ static int kvm_set_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 data)
return kvm_set_msr_ignored_check(vcpu, index, data, false);
}

-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)
{
@@ -8386,7 +8386,7 @@ 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_pmc(struct x86_emulate_ctxt *ctxt,
--
2.39.3