[PATCH v4 03/18] KVM: x86: Remove the KVM private read_msr() function

[Juergen Gross <jgross@suse.com>]

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

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Acked-by: Sean Christopherson <seanjc@google.com>
---
V2:
- remove the helper and use rdmsrq() directly (Sean Christopherson)
---
 arch/x86/include/asm/kvm_host.h | 7 -------
 arch/x86/kvm/vmx/tdx.c          | 2 +-
 arch/x86/kvm/vmx/vmx.c          | 6 +++---
 3 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c87545070347..b4473c4428cf 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2412,13 +2412,6 @@ 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)
-{
-	return rdmsrq(msr);
-}
-#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 989ab29b8c6f..cf4efca81fd4 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -793,7 +793,7 @@ 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);
+		vt->msr_host_kernel_gs_base = rdmsrq(MSR_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 3d53b5bb6914..729d4a0d0beb 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1375,8 +1375,8 @@ 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);
+		fs_base = rdmsrq(MSR_FS_BASE);
+		vt->msr_host_kernel_gs_base = rdmsrq(MSR_KERNEL_GS_BASE);
 	}
 
 	wrmsrq(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
@@ -1435,7 +1435,7 @@ 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);
+		*cache = rdmsrq(msr);
 	preempt_enable();
 	return *cache;
 }
-- 
2.54.0