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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>
This commit is contained in:
Feng (Eric) Liu 2008-04-10 15:31:10 -04:00 committed by Avi Kivity
parent 53371b5098
commit 2714d1d3d6
5 changed files with 147 additions and 2 deletions
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35
arch/x86/kvm/vmx.c
View File

@ -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)

26
arch/x86/kvm/x86.c
View File

@ -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;

20
include/asm-x86/kvm.h
View File

@ -209,4 +209,24 @@ struct kvm_pit_state {
struct kvm_pit_channel_state channels[3];
};
#define KVM_TRC_INJ_VIRQ (KVM_TRC_HANDLER + 0x02)
#define KVM_TRC_REDELIVER_EVT (KVM_TRC_HANDLER + 0x03)
#define KVM_TRC_PEND_INTR (KVM_TRC_HANDLER + 0x04)
#define KVM_TRC_IO_READ (KVM_TRC_HANDLER + 0x05)
#define KVM_TRC_IO_WRITE (KVM_TRC_HANDLER + 0x06)
#define KVM_TRC_CR_READ (KVM_TRC_HANDLER + 0x07)
#define KVM_TRC_CR_WRITE (KVM_TRC_HANDLER + 0x08)
#define KVM_TRC_DR_READ (KVM_TRC_HANDLER + 0x09)
#define KVM_TRC_DR_WRITE (KVM_TRC_HANDLER + 0x0A)
#define KVM_TRC_MSR_READ (KVM_TRC_HANDLER + 0x0B)
#define KVM_TRC_MSR_WRITE (KVM_TRC_HANDLER + 0x0C)
#define KVM_TRC_CPUID (KVM_TRC_HANDLER + 0x0D)
#define KVM_TRC_INTR (KVM_TRC_HANDLER + 0x0E)
#define KVM_TRC_NMI (KVM_TRC_HANDLER + 0x0F)
#define KVM_TRC_VMMCALL (KVM_TRC_HANDLER + 0x10)
#define KVM_TRC_HLT (KVM_TRC_HANDLER + 0x11)
#define KVM_TRC_CLTS (KVM_TRC_HANDLER + 0x12)
#define KVM_TRC_LMSW (KVM_TRC_HANDLER + 0x13)
#define KVM_TRC_APIC_ACCESS (KVM_TRC_HANDLER + 0x14)
#endif

19
include/asm-x86/kvm_host.h
View File

@ -667,4 +667,23 @@ enum {
TASK_SWITCH_GATE = 3,
};
#define KVMTRACE_5D(evt, vcpu, d1, d2, d3, d4, d5, name) \
trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
vcpu, 5, d1, d2, d3, d4, d5)
#define KVMTRACE_4D(evt, vcpu, d1, d2, d3, d4, name) \
trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
vcpu, 4, d1, d2, d3, d4, 0)
#define KVMTRACE_3D(evt, vcpu, d1, d2, d3, name) \
trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
vcpu, 3, d1, d2, d3, 0, 0)
#define KVMTRACE_2D(evt, vcpu, d1, d2, name) \
trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
vcpu, 2, d1, d2, 0, 0, 0)
#define KVMTRACE_1D(evt, vcpu, d1, name) \
trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
vcpu, 1, d1, 0, 0, 0, 0)
#define KVMTRACE_0D(evt, vcpu, name) \
trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
vcpu, 0, 0, 0, 0, 0, 0)
#endif

49
include/linux/kvm.h
View File

@ -14,6 +14,12 @@
#define KVM_API_VERSION 12
/* for KVM_TRACE_ENABLE */
struct kvm_user_trace_setup {
__u32 buf_size; /* sub_buffer size of each per-cpu */
__u32 buf_nr; /* the number of sub_buffers of each per-cpu */
};
/* for KVM_CREATE_MEMORY_REGION */
struct kvm_memory_region {
__u32 slot;
@ -242,6 +248,42 @@ struct kvm_s390_interrupt {
__u64 parm64;
};
#define KVM_TRC_SHIFT 16
/*
* kvm trace categories
*/
#define KVM_TRC_ENTRYEXIT (1 << KVM_TRC_SHIFT)
#define KVM_TRC_HANDLER (1 << (KVM_TRC_SHIFT + 1)) /* only 12 bits */
/*
* kvm trace action
*/
#define KVM_TRC_VMENTRY (KVM_TRC_ENTRYEXIT + 0x01)
#define KVM_TRC_VMEXIT (KVM_TRC_ENTRYEXIT + 0x02)
#define KVM_TRC_PAGE_FAULT (KVM_TRC_HANDLER + 0x01)
#define KVM_TRC_HEAD_SIZE 12
#define KVM_TRC_CYCLE_SIZE 8
#define KVM_TRC_EXTRA_MAX 7
/* This structure represents a single trace buffer record. */
struct kvm_trace_rec {
__u32 event:28;
__u32 extra_u32:3;
__u32 cycle_in:1;
__u32 pid;
__u32 vcpu_id;
union {
struct {
__u32 cycle_lo, cycle_hi;
__u32 extra_u32[KVM_TRC_EXTRA_MAX];
} cycle;
struct {
__u32 extra_u32[KVM_TRC_EXTRA_MAX];
} nocycle;
} u;
};
#define KVMIO 0xAE
/*
@ -262,7 +304,12 @@ struct kvm_s390_interrupt {
*/
#define KVM_GET_VCPU_MMAP_SIZE _IO(KVMIO, 0x04) /* in bytes */
#define KVM_GET_SUPPORTED_CPUID _IOWR(KVMIO, 0x05, struct kvm_cpuid2)
/*
* ioctls for kvm trace
*/
#define KVM_TRACE_ENABLE _IOW(KVMIO, 0x06, struct kvm_user_trace_setup)
#define KVM_TRACE_PAUSE _IO(KVMIO, 0x07)
#define KVM_TRACE_DISABLE _IO(KVMIO, 0x08)
/*
* Extension capability list.
*/