Commit 0d460ffc authored by Stefan Hajnoczi's avatar Stefan Hajnoczi Committed by Avi Kivity
Browse files

KVM: Use __print_symbolic() for vmexit tracepoints 



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: default avatarStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent e097e5ff

arch/x86/include/asm/kvm_host.h

+0 −2
Original line number Diff line number Diff line
@@ -635,8 +635,6 @@ 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 {

arch/x86/kvm/svm.c

+0 −55
Original line number Diff line number Diff line
@@ -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,

arch/x86/kvm/trace.h

+100 −6
Original line number Diff line number Diff line
@@ -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)

);

arch/x86/kvm/vmx.c

+0 −44
Original line number Diff line number Diff line
@@ -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,

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