KVM: Add trace markers

Trace markers allow userspace to trace execution of a virtual machine
in order to monitor its performance.

Signed-off-by: Feng (Eric) Liu <eric.e.liu@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

2 files changed, 60 insertions, 1 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6249810b215..8e5d6645b90 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1843,6 +1843,8 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
 {
         struct vcpu_vmx *vmx = to_vmx(vcpu);
 
+        KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
+
         if (vcpu->arch.rmode.active) {
                 vmx->rmode.irq.pending = true;
                 vmx->rmode.irq.vector = irq;
@@ -1993,6 +1995,8 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
         if (is_page_fault(intr_info)) {
                 cr2 = vmcs_readl(EXIT_QUALIFICATION);
+                KVMTRACE_3D(PAGE_FAULT, vcpu, error_code, (u32)cr2,
+                            (u32)((u64)cr2 >> 32), handler);
                 return kvm_mmu_page_fault(vcpu, cr2, error_code);
         }
 
@@ -2021,6 +2025,7 @@ static int handle_external_interrupt(struct kvm_vcpu *vcpu,
                                      struct kvm_run *kvm_run)
 {
         ++vcpu->stat.irq_exits;
+        KVMTRACE_1D(INTR, vcpu, vmcs_read32(VM_EXIT_INTR_INFO), handler);
         return 1;
 }
 
@@ -2078,6 +2083,8 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
         reg = (exit_qualification >> 8) & 15;
         switch ((exit_qualification >> 4) & 3) {
         case 0: /* mov to cr */
+                KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)vcpu->arch.regs[reg],
+                            (u32)((u64)vcpu->arch.regs[reg] >> 32), handler);
                 switch (cr) {
                 case 0:
                         vcpu_load_rsp_rip(vcpu);
@@ -2110,6 +2117,7 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                 vcpu->arch.cr0 &= ~X86_CR0_TS;
                 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
                 vmx_fpu_activate(vcpu);
+                KVMTRACE_0D(CLTS, vcpu, handler);
                 skip_emulated_instruction(vcpu);
                 return 1;
         case 1: /*mov from cr*/
@@ -2118,12 +2126,18 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                         vcpu_load_rsp_rip(vcpu);
                         vcpu->arch.regs[reg] = vcpu->arch.cr3;
                         vcpu_put_rsp_rip(vcpu);
+                        KVMTRACE_3D(CR_READ, vcpu, (u32)cr,
+                                    (u32)vcpu->arch.regs[reg],
+                                    (u32)((u64)vcpu->arch.regs[reg] >> 32),
+                                    handler);
                         skip_emulated_instruction(vcpu);
                         return 1;
                 case 8:
                         vcpu_load_rsp_rip(vcpu);
                         vcpu->arch.regs[reg] = kvm_get_cr8(vcpu);
                         vcpu_put_rsp_rip(vcpu);
+                        KVMTRACE_2D(CR_READ, vcpu, (u32)cr,
+                                    (u32)vcpu->arch.regs[reg], handler);
                         skip_emulated_instruction(vcpu);
                         return 1;
                 }
@@ -2169,6 +2183,7 @@ static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                         val = 0;
                 }
                 vcpu->arch.regs[reg] = val;
+                KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
         } else {
                 /* mov to dr */
         }
@@ -2193,6 +2208,9 @@ static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                 return 1;
         }
 
+        KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
+                    handler);
+
         /* FIXME: handling of bits 32:63 of rax, rdx */
         vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
         vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
@@ -2206,6 +2224,9 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
         u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
                 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
 
+        KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
+                    handler);
+
         if (vmx_set_msr(vcpu, ecx, data) != 0) {
                 kvm_inject_gp(vcpu, 0);
                 return 1;
@@ -2230,6 +2251,9 @@ static int handle_interrupt_window(struct kvm_vcpu *vcpu,
         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
+
+        KVMTRACE_0D(PEND_INTR, vcpu, handler);
+
         /*
          * If the user space waits to inject interrupts, exit as soon as
          * possible
@@ -2272,6 +2296,8 @@ static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
         exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
         offset = exit_qualification & 0xffful;
 
+        KVMTRACE_1D(APIC_ACCESS, vcpu, (u32)offset, handler);
+
         er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
 
         if (er !=  EMULATE_DONE) {
@@ -2335,6 +2361,9 @@ static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
         struct vcpu_vmx *vmx = to_vmx(vcpu);
         u32 vectoring_info = vmx->idt_vectoring_info;
 
+        KVMTRACE_3D(VMEXIT, vcpu, exit_reason, (u32)vmcs_readl(GUEST_RIP),
+                    (u32)((u64)vmcs_readl(GUEST_RIP) >> 32), entryexit);
+
         if (unlikely(vmx->fail)) {
                 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
                 kvm_run->fail_entry.hardware_entry_failure_reason
@@ -2416,6 +2445,8 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
                         return;
                 }
 
+                KVMTRACE_1D(REDELIVER_EVT, vcpu, idtv_info_field, handler);
+
                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, idtv_info_field);
                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
                                 vmcs_read32(VM_EXIT_INSTRUCTION_LEN));
@@ -2601,8 +2632,10 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
         intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
 
         /* We need to handle NMIs before interrupts are enabled */
-        if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) /* nmi */
+        if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
+                KVMTRACE_0D(NMI, vcpu, handler);
                 asm("int $2");
+        }
 }
 
 static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c7ad2352227..f070f0a9ade 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -303,6 +303,9 @@ EXPORT_SYMBOL_GPL(kvm_set_cr0);
 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 {
         kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
+        KVMTRACE_1D(LMSW, vcpu,
+                    (u32)((vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f)),
+                    handler);
 }
 EXPORT_SYMBOL_GPL(kvm_lmsw);
 
@@ -2269,6 +2272,13 @@ int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
         vcpu->arch.pio.guest_page_offset = 0;
         vcpu->arch.pio.rep = 0;
 
+        if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
+                KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
+                            handler);
+        else
+                KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
+                            handler);
+
         kvm_x86_ops->cache_regs(vcpu);
         memcpy(vcpu->arch.pio_data, &vcpu->arch.regs[VCPU_REGS_RAX], 4);
         kvm_x86_ops->decache_regs(vcpu);
@@ -2307,6 +2317,13 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
         vcpu->arch.pio.guest_page_offset = offset_in_page(address);
         vcpu->arch.pio.rep = rep;
 
+        if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
+                KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
+                            handler);
+        else
+                KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
+                            handler);
+
         if (!count) {
                 kvm_x86_ops->skip_emulated_instruction(vcpu);
                 return 1;
@@ -2414,6 +2431,7 @@ void kvm_arch_exit(void)
 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
 {
         ++vcpu->stat.halt_exits;
+        KVMTRACE_0D(HLT, vcpu, handler);
         if (irqchip_in_kernel(vcpu->kvm)) {
                 vcpu->arch.mp_state = VCPU_MP_STATE_HALTED;
                 up_read(&vcpu->kvm->slots_lock);
@@ -2451,6 +2469,8 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
         a2 = vcpu->arch.regs[VCPU_REGS_RDX];
         a3 = vcpu->arch.regs[VCPU_REGS_RSI];
 
+        KVMTRACE_1D(VMMCALL, vcpu, (u32)nr, handler);
+
         if (!is_long_mode(vcpu)) {
                 nr &= 0xFFFFFFFF;
                 a0 &= 0xFFFFFFFF;
@@ -2639,6 +2659,11 @@ void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
         }
         kvm_x86_ops->decache_regs(vcpu);
         kvm_x86_ops->skip_emulated_instruction(vcpu);
+        KVMTRACE_5D(CPUID, vcpu, function,
+                    (u32)vcpu->arch.regs[VCPU_REGS_RAX],
+                    (u32)vcpu->arch.regs[VCPU_REGS_RBX],
+                    (u32)vcpu->arch.regs[VCPU_REGS_RCX],
+                    (u32)vcpu->arch.regs[VCPU_REGS_RDX], handler);
 }
 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
 
@@ -2794,6 +2819,7 @@ again:
                 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
                         kvm_x86_ops->tlb_flush(vcpu);
 
+        KVMTRACE_0D(VMENTRY, vcpu, entryexit);
         kvm_x86_ops->run(vcpu, kvm_run);
 
         vcpu->guest_mode = 0;