[PATCH v3 04/16] KVM: x86: Remove the KVM private read_msr() function

[Juergen Gross]

Instead of having a KVM private read_msr() function, just use rdmsrq().

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
---
V2:
- remove the helper and use rdmsrq() directly (Sean Christopherson)
---
 arch/x86/include/asm/kvm_host.h | 10 ----------
 arch/x86/kvm/vmx/tdx.c          |  2 +-
 arch/x86/kvm/vmx/vmx.c          |  6 +++---
 3 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index ff07c45e3c73..9034222a96e8 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2347,16 +2347,6 @@ static inline void kvm_load_ldt(u16 sel)
 	asm("lldt %0" : : "rm"(sel));
 }
 
-#ifdef CONFIG_X86_64
-static inline unsigned long read_msr(unsigned long msr)
-{
-	u64 value;
-
-	rdmsrq(msr, value);
-	return value;
-}
-#endif
-
 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
 {
 	kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 5df9d32d2058..d9e371e39853 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -801,7 +801,7 @@ void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
 	if (likely(is_64bit_mm(current->mm)))
 		vt->msr_host_kernel_gs_base = current->thread.gsbase;
 	else
-		vt->msr_host_kernel_gs_base = read_msr(MSR_KERNEL_GS_BASE);
+		rdmsrq(MSR_KERNEL_GS_BASE, vt->msr_host_kernel_gs_base);
 
 	vt->guest_state_loaded = true;
 
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 967b58a8ab9d..3799cbbb4577 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1403,8 +1403,8 @@ void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
 	} else {
 		savesegment(fs, fs_sel);
 		savesegment(gs, gs_sel);
-		fs_base = read_msr(MSR_FS_BASE);
-		vt->msr_host_kernel_gs_base = read_msr(MSR_KERNEL_GS_BASE);
+		rdmsrq(MSR_FS_BASE, fs_base);
+		rdmsrq(MSR_KERNEL_GS_BASE, vt->msr_host_kernel_gs_base);
 	}
 
 	wrmsrq(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
@@ -1463,7 +1463,7 @@ static u64 vmx_read_guest_host_msr(struct vcpu_vmx *vmx, u32 msr, u64 *cache)
 {
 	preempt_disable();
 	if (vmx->vt.guest_state_loaded)
-		*cache = read_msr(msr);
+		rdmsrq(msr, *cache);
 	preempt_enable();
 	return *cache;
 }
-- 
2.53.0