KVM: x86: Move Intel Processor Trace interrupt handler to vmx.c

Now that all state needed for VMX's PT interrupt handler is exposed to
vmx.c (specifically the currently running vCPU), move the handler into
vmx.c where it belongs.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211111020738.2512932-14-seanjc@google.com

Author: sean-jc

arch/x86/include/asm/kvm_host.h

@@ -1517,7 +1517,7 @@ struct kvm_x86_init_ops {
 	int (*disabled_by_bios)(void);
 	int (*check_processor_compatibility)(void);
 	int (*hardware_setup)(void);
-	bool (*intel_pt_intr_in_guest)(void);
+	unsigned int (*handle_intel_pt_intr)(void);
 
 	struct kvm_x86_ops *runtime_ops;
 };

arch/x86/kvm/vmx/vmx.c

@@ -7655,6 +7655,20 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector,
 };
 
+static unsigned int vmx_handle_intel_pt_intr(void)
+{
+	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
+
+	/* '0' on failure so that the !PT case can use a RET0 static call. */
+	if (!kvm_arch_pmi_in_guest(vcpu))
+		return 0;
+
+	kvm_make_request(KVM_REQ_PMI, vcpu);
+	__set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT,
+		  (unsigned long *)&vcpu->arch.pmu.global_status);
+	return 1;
+}
+
 static __init void vmx_setup_user_return_msrs(void)
 {
 
@@ -7681,6 +7695,8 @@ static __init void vmx_setup_user_return_msrs(void)
 		kvm_add_user_return_msr(vmx_uret_msrs_list[i]);
 }
 
+static struct kvm_x86_init_ops vmx_init_ops __initdata;
+
 static __init int hardware_setup(void)
 {
 	unsigned long host_bndcfgs;
@@ -7839,6 +7855,10 @@ static __init int hardware_setup(void)
 		return -EINVAL;
 	if (!enable_ept || !cpu_has_vmx_intel_pt())
 		pt_mode = PT_MODE_SYSTEM;
+	if (pt_mode == PT_MODE_HOST_GUEST)
+		vmx_init_ops.handle_intel_pt_intr = vmx_handle_intel_pt_intr;
+	else
+		vmx_init_ops.handle_intel_pt_intr = NULL;
 
 	setup_default_sgx_lepubkeyhash();
 
@@ -7867,7 +7887,7 @@ static struct kvm_x86_init_ops vmx_init_ops __initdata = {
 	.disabled_by_bios = vmx_disabled_by_bios,
 	.check_processor_compatibility = vmx_check_processor_compat,
 	.hardware_setup = hardware_setup,
-	.intel_pt_intr_in_guest = vmx_pt_mode_is_host_guest,
+	.handle_intel_pt_intr = NULL,
 
 	.runtime_ops = &vmx_x86_ops,
 };

arch/x86/kvm/x86.c

@@ -8469,20 +8469,6 @@ static void kvm_timer_init(void)
 			  kvmclock_cpu_online, kvmclock_cpu_down_prep);
 }
 
-static unsigned int kvm_handle_intel_pt_intr(void)
-{
-	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
-
-	/* '0' on failure so that the !PT case can use a RET0 static call. */
-	if (!kvm_arch_pmi_in_guest(vcpu))
-		return 0;
-
-	kvm_make_request(KVM_REQ_PMI, vcpu);
-	__set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT,
-			(unsigned long *)&vcpu->arch.pmu.global_status);
-	return 1;
-}
-
 #ifdef CONFIG_X86_64
 static void pvclock_gtod_update_fn(struct work_struct *work)
 {
@@ -11192,11 +11178,7 @@ int kvm_arch_hardware_setup(void *opaque)
 	memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops));
 	kvm_ops_static_call_update();
 
-	/* Temporary ugliness. */
-	if (ops->intel_pt_intr_in_guest && ops->intel_pt_intr_in_guest())
-		kvm_register_perf_callbacks(kvm_handle_intel_pt_intr);
-	else
-		kvm_register_perf_callbacks(NULL);
+	kvm_register_perf_callbacks(ops->handle_intel_pt_intr);
 
 	if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES))
 		supported_xss = 0;