The vmexit tracepoints format the exit_reason to make it human-readable.
Since the exit_reason depends on the instruction set (vmx or svm),
formatting is handled with ftrace_print_symbols_seq() by referring to
the appropriate exit reason table.
However, the ftrace_print_symbols_seq() function is not meant to be used
directly in tracepoints since it does not export the formatting table
which userspace tools like trace-cmd and perf use to format traces.
In practice perf dies when formatting vmexit-related events and
trace-cmd falls back to printing the numeric value (with extra
formatting code in the kvm plugin to paper over this limitation). Other
userspace consumers of vmexit-related tracepoints would be in similar
trouble.
To avoid significant changes to the kvm_exit tracepoint, this patch
moves the vmx and svm exit reason tables into arch/x86/kvm/trace.h and
selects the right table with __print_symbolic() depending on the
instruction set. Note that __print_symbolic() is designed for exporting
the formatting table to userspace and allows trace-cmd and perf to work.
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 -
arch/x86/kvm/svm.c | 55 --------------------
arch/x86/kvm/trace.h | 106 ++++++++++++++++++++++++++++++++++++--
arch/x86/kvm/vmx.c | 44 ----------------
4 files changed, 100 insertions(+), 107 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index dd51c83..582c3b7 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -634,8 +634,6 @@ struct kvm_x86_ops {
int (*check_intercept)(struct kvm_vcpu *vcpu,
struct x86_instruction_info *info,
enum x86_intercept_stage stage);
-
- const struct trace_print_flags *exit_reasons_str;
};
struct kvm_arch_async_pf {
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 6adb7ba..2b24a88 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3899,60 +3899,6 @@ static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
}
}
-static const struct trace_print_flags svm_exit_reasons_str[] = {
- { SVM_EXIT_READ_CR0, "read_cr0" },
- { SVM_EXIT_READ_CR3, "read_cr3" },
- { SVM_EXIT_READ_CR4, "read_cr4" },
- { SVM_EXIT_READ_CR8, "read_cr8" },
- { SVM_EXIT_WRITE_CR0, "write_cr0" },
- { SVM_EXIT_WRITE_CR3, "write_cr3" },
- { SVM_EXIT_WRITE_CR4, "write_cr4" },
- { SVM_EXIT_WRITE_CR8, "write_cr8" },
- { SVM_EXIT_READ_DR0, "read_dr0" },
- { SVM_EXIT_READ_DR1, "read_dr1" },
- { SVM_EXIT_READ_DR2, "read_dr2" },
- { SVM_EXIT_READ_DR3, "read_dr3" },
- { SVM_EXIT_WRITE_DR0, "write_dr0" },
- { SVM_EXIT_WRITE_DR1, "write_dr1" },
- { SVM_EXIT_WRITE_DR2, "write_dr2" },
- { SVM_EXIT_WRITE_DR3, "write_dr3" },
- { SVM_EXIT_WRITE_DR5, "write_dr5" },
- { SVM_EXIT_WRITE_DR7, "write_dr7" },
- { SVM_EXIT_EXCP_BASE + DB_VECTOR, "DB excp" },
- { SVM_EXIT_EXCP_BASE + BP_VECTOR, "BP excp" },
- { SVM_EXIT_EXCP_BASE + UD_VECTOR, "UD excp" },
- { SVM_EXIT_EXCP_BASE + PF_VECTOR, "PF excp" },
- { SVM_EXIT_EXCP_BASE + NM_VECTOR, "NM excp" },
- { SVM_EXIT_EXCP_BASE + MC_VECTOR, "MC excp" },
- { SVM_EXIT_INTR, "interrupt" },
- { SVM_EXIT_NMI, "nmi" },
- { SVM_EXIT_SMI, "smi" },
- { SVM_EXIT_INIT, "init" },
- { SVM_EXIT_VINTR, "vintr" },
- { SVM_EXIT_CPUID, "cpuid" },
- { SVM_EXIT_INVD, "invd" },
- { SVM_EXIT_HLT, "hlt" },
- { SVM_EXIT_INVLPG, "invlpg" },
- { SVM_EXIT_INVLPGA, "invlpga" },
- { SVM_EXIT_IOIO, "io" },
- { SVM_EXIT_MSR, "msr" },
- { SVM_EXIT_TASK_SWITCH, "task_switch" },
- { SVM_EXIT_SHUTDOWN, "shutdown" },
- { SVM_EXIT_VMRUN, "vmrun" },
- { SVM_EXIT_VMMCALL, "hypercall" },
- { SVM_EXIT_VMLOAD, "vmload" },
- { SVM_EXIT_VMSAVE, "vmsave" },
- { SVM_EXIT_STGI, "stgi" },
- { SVM_EXIT_CLGI, "clgi" },
- { SVM_EXIT_SKINIT, "skinit" },
- { SVM_EXIT_WBINVD, "wbinvd" },
- { SVM_EXIT_MONITOR, "monitor" },
- { SVM_EXIT_MWAIT, "mwait" },
- { SVM_EXIT_XSETBV, "xsetbv" },
- { SVM_EXIT_NPF, "npf" },
- { -1, NULL }
-};
-
static int svm_get_lpage_level(void)
{
return PT_PDPE_LEVEL;
@@ -4225,7 +4171,6 @@ static struct kvm_x86_ops svm_x86_ops = {
.get_mt_mask = svm_get_mt_mask,
.get_exit_info = svm_get_exit_info,
- .exit_reasons_str = svm_exit_reasons_str,
.get_lpage_level = svm_get_lpage_level,
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 4e1716b..911d264 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -2,6 +2,8 @@
#define _TRACE_KVM_H
#include <linux/tracepoint.h>
+#include <asm/vmx.h>
+#include <asm/svm.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvm
@@ -181,6 +183,95 @@ TRACE_EVENT(kvm_apic,
#define KVM_ISA_VMX 1
#define KVM_ISA_SVM 2
+#define VMX_EXIT_REASONS \
+ { EXIT_REASON_EXCEPTION_NMI, "EXCEPTION_NMI" }, \
+ { EXIT_REASON_EXTERNAL_INTERRUPT, "EXTERNAL_INTERRUPT" }, \
+ { EXIT_REASON_TRIPLE_FAULT, "TRIPLE_FAULT" }, \
+ { EXIT_REASON_PENDING_INTERRUPT, "PENDING_INTERRUPT" }, \
+ { EXIT_REASON_NMI_WINDOW, "NMI_WINDOW" }, \
+ { EXIT_REASON_TASK_SWITCH, "TASK_SWITCH" }, \
+ { EXIT_REASON_CPUID, "CPUID" }, \
+ { EXIT_REASON_HLT, "HLT" }, \
+ { EXIT_REASON_INVLPG, "INVLPG" }, \
+ { EXIT_REASON_RDPMC, "RDPMC" }, \
+ { EXIT_REASON_RDTSC, "RDTSC" }, \
+ { EXIT_REASON_VMCALL, "VMCALL" }, \
+ { EXIT_REASON_VMCLEAR, "VMCLEAR" }, \
+ { EXIT_REASON_VMLAUNCH, "VMLAUNCH" }, \
+ { EXIT_REASON_VMPTRLD, "VMPTRLD" }, \
+ { EXIT_REASON_VMPTRST, "VMPTRST" }, \
+ { EXIT_REASON_VMREAD, "VMREAD" }, \
+ { EXIT_REASON_VMRESUME, "VMRESUME" }, \
+ { EXIT_REASON_VMWRITE, "VMWRITE" }, \
+ { EXIT_REASON_VMOFF, "VMOFF" }, \
+ { EXIT_REASON_VMON, "VMON" }, \
+ { EXIT_REASON_CR_ACCESS, "CR_ACCESS" }, \
+ { EXIT_REASON_DR_ACCESS, "DR_ACCESS" }, \
+ { EXIT_REASON_IO_INSTRUCTION, "IO_INSTRUCTION" }, \
+ { EXIT_REASON_MSR_READ, "MSR_READ" }, \
+ { EXIT_REASON_MSR_WRITE, "MSR_WRITE" }, \
+ { EXIT_REASON_MWAIT_INSTRUCTION, "MWAIT_INSTRUCTION" }, \
+ { EXIT_REASON_MONITOR_INSTRUCTION, "MONITOR_INSTRUCTION" }, \
+ { EXIT_REASON_PAUSE_INSTRUCTION, "PAUSE_INSTRUCTION" }, \
+ { EXIT_REASON_MCE_DURING_VMENTRY, "MCE_DURING_VMENTRY" }, \
+ { EXIT_REASON_TPR_BELOW_THRESHOLD, "TPR_BELOW_THRESHOLD" }, \
+ { EXIT_REASON_APIC_ACCESS, "APIC_ACCESS" }, \
+ { EXIT_REASON_EPT_VIOLATION, "EPT_VIOLATION" }, \
+ { EXIT_REASON_EPT_MISCONFIG, "EPT_MISCONFIG" }, \
+ { EXIT_REASON_WBINVD, "WBINVD" }
+
+#define SVM_EXIT_REASONS \
+ { SVM_EXIT_READ_CR0, "read_cr0" }, \
+ { SVM_EXIT_READ_CR3, "read_cr3" }, \
+ { SVM_EXIT_READ_CR4, "read_cr4" }, \
+ { SVM_EXIT_READ_CR8, "read_cr8" }, \
+ { SVM_EXIT_WRITE_CR0, "write_cr0" }, \
+ { SVM_EXIT_WRITE_CR3, "write_cr3" }, \
+ { SVM_EXIT_WRITE_CR4, "write_cr4" }, \
+ { SVM_EXIT_WRITE_CR8, "write_cr8" }, \
+ { SVM_EXIT_READ_DR0, "read_dr0" }, \
+ { SVM_EXIT_READ_DR1, "read_dr1" }, \
+ { SVM_EXIT_READ_DR2, "read_dr2" }, \
+ { SVM_EXIT_READ_DR3, "read_dr3" }, \
+ { SVM_EXIT_WRITE_DR0, "write_dr0" }, \
+ { SVM_EXIT_WRITE_DR1, "write_dr1" }, \
+ { SVM_EXIT_WRITE_DR2, "write_dr2" }, \
+ { SVM_EXIT_WRITE_DR3, "write_dr3" }, \
+ { SVM_EXIT_WRITE_DR5, "write_dr5" }, \
+ { SVM_EXIT_WRITE_DR7, "write_dr7" }, \
+ { SVM_EXIT_EXCP_BASE + DB_VECTOR, "DB excp" }, \
+ { SVM_EXIT_EXCP_BASE + BP_VECTOR, "BP excp" }, \
+ { SVM_EXIT_EXCP_BASE + UD_VECTOR, "UD excp" }, \
+ { SVM_EXIT_EXCP_BASE + PF_VECTOR, "PF excp" }, \
+ { SVM_EXIT_EXCP_BASE + NM_VECTOR, "NM excp" }, \
+ { SVM_EXIT_EXCP_BASE + MC_VECTOR, "MC excp" }, \
+ { SVM_EXIT_INTR, "interrupt" }, \
+ { SVM_EXIT_NMI, "nmi" }, \
+ { SVM_EXIT_SMI, "smi" }, \
+ { SVM_EXIT_INIT, "init" }, \
+ { SVM_EXIT_VINTR, "vintr" }, \
+ { SVM_EXIT_CPUID, "cpuid" }, \
+ { SVM_EXIT_INVD, "invd" }, \
+ { SVM_EXIT_HLT, "hlt" }, \
+ { SVM_EXIT_INVLPG, "invlpg" }, \
+ { SVM_EXIT_INVLPGA, "invlpga" }, \
+ { SVM_EXIT_IOIO, "io" }, \
+ { SVM_EXIT_MSR, "msr" }, \
+ { SVM_EXIT_TASK_SWITCH, "task_switch" }, \
+ { SVM_EXIT_SHUTDOWN, "shutdown" }, \
+ { SVM_EXIT_VMRUN, "vmrun" }, \
+ { SVM_EXIT_VMMCALL, "hypercall" }, \
+ { SVM_EXIT_VMLOAD, "vmload" }, \
+ { SVM_EXIT_VMSAVE, "vmsave" }, \
+ { SVM_EXIT_STGI, "stgi" }, \
+ { SVM_EXIT_CLGI, "clgi" }, \
+ { SVM_EXIT_SKINIT, "skinit" }, \
+ { SVM_EXIT_WBINVD, "wbinvd" }, \
+ { SVM_EXIT_MONITOR, "monitor" }, \
+ { SVM_EXIT_MWAIT, "mwait" }, \
+ { SVM_EXIT_XSETBV, "xsetbv" }, \
+ { SVM_EXIT_NPF, "npf" }
+
/*
* Tracepoint for kvm guest exit:
*/
@@ -205,8 +296,9 @@ TRACE_EVENT(kvm_exit,
),
TP_printk("reason %s rip 0x%lx info %llx %llx",
- ftrace_print_symbols_seq(p, __entry->exit_reason,
- kvm_x86_ops->exit_reasons_str),
+ (__entry->isa == KVM_ISA_VMX) ?
+ __print_symbolic(__entry->exit_reason, VMX_EXIT_REASONS) :
+ __print_symbolic(__entry->exit_reason, SVM_EXIT_REASONS),
__entry->guest_rip, __entry->info1, __entry->info2)
);
@@ -512,8 +604,9 @@ TRACE_EVENT(kvm_nested_vmexit,
TP_printk("rip: 0x%016llx reason: %s ext_inf1: 0x%016llx "
"ext_inf2: 0x%016llx ext_int: 0x%08x ext_int_err: 0x%08x",
__entry->rip,
- ftrace_print_symbols_seq(p, __entry->exit_code,
- kvm_x86_ops->exit_reasons_str),
+ (__entry->isa == KVM_ISA_VMX) ?
+ __print_symbolic(__entry->exit_code, VMX_EXIT_REASONS) :
+ __print_symbolic(__entry->exit_code, SVM_EXIT_REASONS),
__entry->exit_info1, __entry->exit_info2,
__entry->exit_int_info, __entry->exit_int_info_err)
);
@@ -548,8 +641,9 @@ TRACE_EVENT(kvm_nested_vmexit_inject,
TP_printk("reason: %s ext_inf1: 0x%016llx "
"ext_inf2: 0x%016llx ext_int: 0x%08x ext_int_err: 0x%08x",
- ftrace_print_symbols_seq(p, __entry->exit_code,
- kvm_x86_ops->exit_reasons_str),
+ (__entry->isa == KVM_ISA_VMX) ?
+ __print_symbolic(__entry->exit_code, VMX_EXIT_REASONS) :
+ __print_symbolic(__entry->exit_code, SVM_EXIT_REASONS),
__entry->exit_info1, __entry->exit_info2,
__entry->exit_int_info, __entry->exit_int_info_err)
);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e65a158..e26629f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6241,49 +6241,6 @@ static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
return ret;
}
-#define _ER(x) { EXIT_REASON_##x, #x }
-
-static const struct trace_print_flags vmx_exit_reasons_str[] = {
- _ER(EXCEPTION_NMI),
- _ER(EXTERNAL_INTERRUPT),
- _ER(TRIPLE_FAULT),
- _ER(PENDING_INTERRUPT),
- _ER(NMI_WINDOW),
- _ER(TASK_SWITCH),
- _ER(CPUID),
- _ER(HLT),
- _ER(INVLPG),
- _ER(RDPMC),
- _ER(RDTSC),
- _ER(VMCALL),
- _ER(VMCLEAR),
- _ER(VMLAUNCH),
- _ER(VMPTRLD),
- _ER(VMPTRST),
- _ER(VMREAD),
- _ER(VMRESUME),
- _ER(VMWRITE),
- _ER(VMOFF),
- _ER(VMON),
- _ER(CR_ACCESS),
- _ER(DR_ACCESS),
- _ER(IO_INSTRUCTION),
- _ER(MSR_READ),
- _ER(MSR_WRITE),
- _ER(MWAIT_INSTRUCTION),
- _ER(MONITOR_INSTRUCTION),
- _ER(PAUSE_INSTRUCTION),
- _ER(MCE_DURING_VMENTRY),
- _ER(TPR_BELOW_THRESHOLD),
- _ER(APIC_ACCESS),
- _ER(EPT_VIOLATION),
- _ER(EPT_MISCONFIG),
- _ER(WBINVD),
- { -1, NULL }
-};
-
-#undef _ER
-
static int vmx_get_lpage_level(void)
{
if (enable_ept && !cpu_has_vmx_ept_1g_page())
@@ -7039,7 +6996,6 @@ static struct kvm_x86_ops vmx_x86_ops = {
.get_mt_mask = vmx_get_mt_mask,
.get_exit_info = vmx_get_exit_info,
- .exit_reasons_str = vmx_exit_reasons_str,
.get_lpage_level = vmx_get_lpage_level,
--
1.7.5.4
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