KVM: x86/PVM: Add PVM hypercalls exit reason handling

Add PVM exit reasons for various hypercall scenarios. The
new exit reasons cover various PVM hypercall types, including IRQ_WIN,
IRQ_HALT, LOAD_PGTBL, TLB_FLUSH, TLB_FLUSH_CURRENT, TLB_INVLPG,
LOAD_GS, RDMSR, WRMSR, and LOAD_TLS.

Improve the handling of exit reasons for PVM by adding PVM hypercall
exit reasons. This change benefits performance analysis tools, such as
perf, by allowing them to provide more detailed information about the
execution of PVM hypercalls.

Suggested-by: Like Xu <likexu@tencent.com>
Signed-off-by: Jinrong Liang <cloudliang@tencent.com>

Author: Jinrong Liang

arch/x86/kvm/pvm/pvm.c

@@ -2441,6 +2441,34 @@ static u32 pvm_get_syscall_exit_reason(struct kvm_vcpu *vcpu)
 	return PVM_EXIT_REASONS_SYSCALL;
 }
 
+static u64 pvm_get_hypercall_exit_reason(struct kvm_vcpu *vcpu)
+{
+	switch (kvm_rax_read(vcpu)) {
+	case PVM_HC_IRQ_WIN:
+		return PVM_EXIT_REASONS_HC_IRQ_WIN;
+	case PVM_HC_IRQ_HALT:
+		return PVM_EXIT_REASONS_HC_IRQ_HALT;
+	case PVM_HC_LOAD_PGTBL:
+		return PVM_EXIT_REASONS_HC_LOAD_PGTBL;
+	case PVM_HC_TLB_FLUSH:
+		return PVM_EXIT_REASONS_HC_TLB_FLUSH;
+	case PVM_HC_TLB_FLUSH_CURRENT:
+		return PVM_EXIT_REASONS_HC_TLB_FLUSH_CURRENT;
+	case PVM_HC_TLB_INVLPG:
+		return PVM_EXIT_REASONS_HC_TLB_INVLPG;
+	case PVM_HC_LOAD_GS:
+		return PVM_EXIT_REASONS_HC_LOAD_GS;
+	case PVM_HC_RDMSR:
+		return PVM_EXIT_REASONS_HC_RDMSR;
+	case PVM_HC_WRMSR:
+		return PVM_EXIT_REASONS_HC_WRMSR;
+	case PVM_HC_LOAD_TLS:
+		return PVM_EXIT_REASONS_HC_LOAD_TLS;
+	default:
+		return 0;
+	}
+}
+
 static void pvm_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, u64 *info1, u64 *info2,
 			      u32 *intr_info, u32 *error_code)
 {
@@ -2459,6 +2487,9 @@ static void pvm_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason, u64 *info1, u6
 	*info2 = pvm->exit_error_code;
 	*intr_info = pvm->exit_vector;
 	*error_code = pvm->exit_error_code;
+
+	if (*reason == PVM_EXIT_REASONS_HYPERCALL)
+		*info2 = pvm_get_hypercall_exit_reason(vcpu);
 }
 
 static void pvm_handle_exit_irqoff(struct kvm_vcpu *vcpu)

arch/x86/kvm/pvm/pvm.h

@@ -36,6 +36,17 @@
 #define PVM_EXIT_REASONS_INTERRUPT	(5UL << PVM_EXIT_REASONS_SHIFT)
 #define PVM_EXIT_REASONS_INT80		(6UL << PVM_EXIT_REASONS_SHIFT)
 
+#define PVM_EXIT_REASONS_HC_IRQ_WIN		(PVM_EXIT_REASONS_HYPERCALL + 1)
+#define PVM_EXIT_REASONS_HC_IRQ_HALT		(PVM_EXIT_REASONS_HYPERCALL + 2)
+#define PVM_EXIT_REASONS_HC_LOAD_PGTBL		(PVM_EXIT_REASONS_HYPERCALL + 3)
+#define PVM_EXIT_REASONS_HC_TLB_FLUSH		(PVM_EXIT_REASONS_HYPERCALL + 4)
+#define PVM_EXIT_REASONS_HC_TLB_FLUSH_CURRENT	(PVM_EXIT_REASONS_HYPERCALL + 5)
+#define PVM_EXIT_REASONS_HC_TLB_INVLPG		(PVM_EXIT_REASONS_HYPERCALL + 6)
+#define PVM_EXIT_REASONS_HC_LOAD_GS		(PVM_EXIT_REASONS_HYPERCALL + 7)
+#define PVM_EXIT_REASONS_HC_RDMSR		(PVM_EXIT_REASONS_HYPERCALL + 8)
+#define PVM_EXIT_REASONS_HC_WRMSR		(PVM_EXIT_REASONS_HYPERCALL + 9)
+#define PVM_EXIT_REASONS_HC_LOAD_TLS		(PVM_EXIT_REASONS_HYPERCALL + 10)
+
 #define PVM_EXIT_REASONS		\
 	{ DE_VECTOR, "DE excp" },	\
 	{ DB_VECTOR, "DB excp" },	\
@@ -61,6 +72,16 @@
 	{ PVM_EXIT_REASONS_ERETS, "ERETS" },		\
 	{ PVM_EXIT_REASONS_INTERRUPT, "INTERRUPT" },	\
 	{ PVM_EXIT_REASONS_INT80, "INT80" },		\
+	{ PVM_EXIT_REASONS_HC_IRQ_WIN, "HC_IRQ_WIN" },		\
+	{ PVM_EXIT_REASONS_HC_IRQ_HALT, "HC_IRQ_HALT" },	\
+	{ PVM_EXIT_REASONS_HC_LOAD_PGTBL, "HC_LOAD_PGTBL" },	\
+	{ PVM_EXIT_REASONS_HC_TLB_FLUSH, "HC_TLB_FLUSH" },	\
+	{ PVM_EXIT_REASONS_HC_TLB_FLUSH_CURRENT, "HC_TLB_FLUSH_CURRENT" },\
+	{ PVM_EXIT_REASONS_HC_TLB_INVLPG, "HC_TLB_INVLPG" },	\
+	{ PVM_EXIT_REASONS_HC_LOAD_GS, "HC_LOAD_GS" },		\
+	{ PVM_EXIT_REASONS_HC_RDMSR, "HC_RDMSR" },		\
+	{ PVM_EXIT_REASONS_HC_WRMSR, "HC_WRMSR" },		\
+	{ PVM_EXIT_REASONS_HC_LOAD_TLS, "HC_LOAD_TLS" },	\
 	{ PVM_FAILED_VMENTRY_VECTOR, "FAILED_VMENTRY" }
 
 #define PT_L4_SHIFT		39