[PATCH 04/26] KVM: x86: Add a kvm_x86_ops hook to query virtualized MSR support

[Sean Christopherson <sean.j.christopherson@intel.com>]

Add a hook, ->has_virtualized_msr(), to allow moving vendor specific
checks into SVM/VMX and ultimately facilitate the removal of the
piecemeal ->*_supported() hooks.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/svm.c              | 6 ++++++
 arch/x86/kvm/vmx/vmx.c          | 6 ++++++
 arch/x86/kvm/x86.c              | 2 ++
 4 files changed, 15 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5c2ad3fa0980..8fb32c27fa44 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1050,6 +1050,7 @@ struct kvm_x86_ops {
 	int (*hardware_setup)(void);               /* __init */
 	void (*hardware_unsetup)(void);            /* __exit */
 	bool (*cpu_has_accelerated_tpr)(void);
+	bool (*has_virtualized_msr)(u32 index);
 	bool (*has_emulated_msr)(u32 index);
 	void (*cpuid_update)(struct kvm_vcpu *vcpu);
 
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a7b944a3a0e2..1f9323fbad81 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5985,6 +5985,11 @@ static bool svm_cpu_has_accelerated_tpr(void)
 	return false;
 }
 
+static bool svm_has_virtualized_msr(u32 index)
+{
+	return true;
+}
+
 static bool svm_has_emulated_msr(u32 index)
 {
 	switch (index) {
@@ -7379,6 +7384,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
 	.hardware_enable = svm_hardware_enable,
 	.hardware_disable = svm_hardware_disable,
 	.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
+	.has_virtualized_msr = svm_has_virtualized_msr,
 	.has_emulated_msr = svm_has_emulated_msr,
 
 	.vcpu_create = svm_create_vcpu,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f5bb1ad2e9fa..3f2c094434e8 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6274,6 +6274,11 @@ static void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu,
 		*exit_fastpath = handle_fastpath_set_msr_irqoff(vcpu);
 }
 
+static bool vmx_has_virtualized_msr(u32 index)
+{
+	return true;
+}
+
 static bool vmx_has_emulated_msr(u32 index)
 {
 	switch (index) {
@@ -7754,6 +7759,7 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
 	.hardware_enable = hardware_enable,
 	.hardware_disable = hardware_disable,
 	.cpu_has_accelerated_tpr = report_flexpriority,
+	.has_virtualized_msr = vmx_has_virtualized_msr,
 	.has_emulated_msr = vmx_has_emulated_msr,
 
 	.vm_init = vmx_vm_init,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3d4a5326d84e..94f90fe1c0de 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5279,6 +5279,8 @@ static void kvm_init_msr_list(void)
 				continue;
 			break;
 		default:
+			if (!kvm_x86_ops->has_virtualized_msr(msr_index))
+				continue;
 			break;
 		}
 
-- 
2.24.1