diff mbox series

[v5,1/3] KVM: x86: add more information to the kvm_entry tracepoint

Message ID 20240910200350.264245-2-mlevitsk@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: tracepoint updates | expand

Commit Message

Maxim Levitsky Sept. 10, 2024, 8:03 p.m. UTC 
Add VMX/SVM specific interrupt injection info to vm entry tracepoint.
Also add a flag showing that immediate vm exit is set to happen after
the entry.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 arch/x86/include/asm/kvm-x86-ops.h |  1 +
 arch/x86/include/asm/kvm_host.h    |  5 ++++-
 arch/x86/kvm/svm/svm.c             | 17 +++++++++++++++++
 arch/x86/kvm/trace.h               | 17 ++++++++++++++---
 arch/x86/kvm/vmx/main.c            |  1 +
 arch/x86/kvm/vmx/vmx.c             | 11 +++++++++++
 arch/x86/kvm/vmx/x86_ops.h         |  4 ++++
 7 files changed, 52 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index 03b7e13f15bbd..af5c4d55d47bc 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -99,6 +99,7 @@  KVM_X86_OP(get_l2_tsc_multiplier)
 KVM_X86_OP(write_tsc_offset)
 KVM_X86_OP(write_tsc_multiplier)
 KVM_X86_OP(get_exit_info)
+KVM_X86_OP(get_entry_info)
 KVM_X86_OP(check_intercept)
 KVM_X86_OP(handle_exit_irqoff)
 KVM_X86_OP_OPTIONAL(update_cpu_dirty_logging)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 52443ccda320f..8118f75a8a35d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1756,13 +1756,16 @@  struct kvm_x86_ops {
 	void (*write_tsc_multiplier)(struct kvm_vcpu *vcpu);
 
 	/*
-	 * Retrieve somewhat arbitrary exit information.  Intended to
+	 * Retrieve somewhat arbitrary exit/entry information.  Intended to
 	 * be used only from within tracepoints or error paths.
 	 */
 	void (*get_exit_info)(struct kvm_vcpu *vcpu, u32 *reason,
 			      u64 *info1, u64 *info2,
 			      u32 *exit_int_info, u32 *exit_int_info_err_code);
 
+	void (*get_entry_info)(struct kvm_vcpu *vcpu,
+				u32 *inj_info, u32 *inj_info_error_code);
+
 	int (*check_intercept)(struct kvm_vcpu *vcpu,
 			       struct x86_instruction_info *info,
 			       enum x86_intercept_stage stage,
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 9a0506ef87dfb..485f3c2826312 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3525,6 +3525,22 @@  static void svm_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
 		*error_code = 0;
 }
 
+static void svm_get_entry_info(struct kvm_vcpu *vcpu,
+			u32 *inj_info,
+			u32 *inj_info_error_code)
+{
+	struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
+
+	*inj_info = control->event_inj;
+
+	if ((*inj_info & SVM_EXITINTINFO_VALID) &&
+	    (*inj_info & SVM_EXITINTINFO_VALID_ERR))
+		*inj_info_error_code = control->event_inj_err;
+	else
+		*inj_info_error_code = 0;
+
+}
+
 static int svm_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
@@ -5057,6 +5073,7 @@  static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.required_apicv_inhibits = AVIC_REQUIRED_APICV_INHIBITS,
 
 	.get_exit_info = svm_get_exit_info,
+	.get_entry_info = svm_get_entry_info,
 
 	.vcpu_after_set_cpuid = svm_vcpu_after_set_cpuid,
 
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index d3aeffd6ae753..b4c014b1aa9a1 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -22,16 +22,27 @@  TRACE_EVENT(kvm_entry,
 		__field(	unsigned int,	vcpu_id		)
 		__field(	unsigned long,	rip		)
 		__field(	bool,		immediate_exit	)
+		__field(	u32,		inj_info	)
+		__field(	u32,		inj_info_err	)
+		__field(	bool,		guest_mode	)
 	),
 
 	TP_fast_assign(
 		__entry->vcpu_id        = vcpu->vcpu_id;
 		__entry->rip		= kvm_rip_read(vcpu);
-		__entry->immediate_exit	= force_immediate_exit;
+		__entry->immediate_exit = force_immediate_exit;
+		__entry->guest_mode     = is_guest_mode(vcpu);
+
+		static_call(kvm_x86_get_entry_info)(vcpu,
+					  &__entry->inj_info,
+					  &__entry->inj_info_err);
 	),
 
-	TP_printk("vcpu %u, rip 0x%lx%s", __entry->vcpu_id, __entry->rip,
-		  __entry->immediate_exit ? "[immediate exit]" : "")
+	TP_printk("vcpu %u, rip 0x%lx inj 0x%08x inj_error_code 0x%08x%s%s",
+		  __entry->vcpu_id, __entry->rip,
+		  __entry->inj_info, __entry->inj_info_err,
+		  __entry->immediate_exit ? "[immediate exit]" : "",
+		  __entry->guest_mode ? "[guest]" : "")
 );
 
 /*
diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index 7e2e78a142574..769a7ca06f59b 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -108,6 +108,7 @@  struct kvm_x86_ops vt_x86_ops __initdata = {
 	.get_mt_mask = vmx_get_mt_mask,
 
 	.get_exit_info = vmx_get_exit_info,
+	.get_entry_info = vmx_get_entry_info,
 
 	.vcpu_after_set_cpuid = vmx_vcpu_after_set_cpuid,
 
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 89682832dded7..af18174cc4a20 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6180,6 +6180,17 @@  void vmx_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
 	}
 }
 
+void vmx_get_entry_info(struct kvm_vcpu *vcpu,
+			      u32 *inj_info,
+			      u32 *inj_info_error_code)
+{
+	*inj_info = vmcs_read32(VM_ENTRY_INTR_INFO_FIELD);
+	if (is_exception_with_error_code(*inj_info))
+		*inj_info_error_code = vmcs_read32(VM_ENTRY_EXCEPTION_ERROR_CODE);
+	else
+		*inj_info_error_code = 0;
+}
+
 static void vmx_destroy_pml_buffer(struct vcpu_vmx *vmx)
 {
 	if (vmx->pml_pg) {
diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h
index b6a7cfc6ae317..124425997ec15 100644
--- a/arch/x86/kvm/vmx/x86_ops.h
+++ b/arch/x86/kvm/vmx/x86_ops.h
@@ -104,8 +104,12 @@  void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
 int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
 int vmx_set_identity_map_addr(struct kvm *kvm, u64 ident_addr);
 u8 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
+
 void vmx_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
 		       u64 *info1, u64 *info2, u32 *intr_info, u32 *error_code);
+void vmx_get_entry_info(struct kvm_vcpu *vcpu, u32 *inj_info,
+			   u32 *inj_info_error_code);
+
 u64 vmx_get_l2_tsc_offset(struct kvm_vcpu *vcpu);
 u64 vmx_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu);
 void vmx_write_tsc_offset(struct kvm_vcpu *vcpu);