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linux-pinenote/tools/lib/traceevent/plugin_kvm.c
Namhyung Kim 354a2bd031 tools lib traceevent: Unregister handler when kvm plugin is unloaded 
The kvm handlers should be unregistered when the plugin is unloaded
otherwise they'll try to access invalid memory.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1389839478-5887-7-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-01-16 16:26:24 -03:00

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/*
* Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "event-parse.h"
#ifdef HAVE_UDIS86
#include <udis86.h>
static ud_t ud;
static void init_disassembler(void)
{
ud_init(&ud);
ud_set_syntax(&ud, UD_SYN_ATT);
}
static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
int cr0_pe, int eflags_vm,
int cs_d, int cs_l)
{
int mode;
if (!cr0_pe)
mode = 16;
else if (eflags_vm)
mode = 16;
else if (cs_l)
mode = 64;
else if (cs_d)
mode = 32;
else
mode = 16;
ud_set_pc(&ud, rip);
ud_set_mode(&ud, mode);
ud_set_input_buffer(&ud, insn, len);
ud_disassemble(&ud);
return ud_insn_asm(&ud);
}
#else
static void init_disassembler(void)
{
}
static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
int cr0_pe, int eflags_vm,
int cs_d, int cs_l)
{
static char out[15*3+1];
int i;
for (i = 0; i < len; ++i)
sprintf(out + i * 3, "%02x ", insn[i]);
out[len*3-1] = '\0';
return out;
}
#endif
#define VMX_EXIT_REASONS \
_ER(EXCEPTION_NMI, 0) \
_ER(EXTERNAL_INTERRUPT, 1) \
_ER(TRIPLE_FAULT, 2) \
_ER(PENDING_INTERRUPT, 7) \
_ER(NMI_WINDOW, 8) \
_ER(TASK_SWITCH, 9) \
_ER(CPUID, 10) \
_ER(HLT, 12) \
_ER(INVD, 13) \
_ER(INVLPG, 14) \
_ER(RDPMC, 15) \
_ER(RDTSC, 16) \
_ER(VMCALL, 18) \
_ER(VMCLEAR, 19) \
_ER(VMLAUNCH, 20) \
_ER(VMPTRLD, 21) \
_ER(VMPTRST, 22) \
_ER(VMREAD, 23) \
_ER(VMRESUME, 24) \
_ER(VMWRITE, 25) \
_ER(VMOFF, 26) \
_ER(VMON, 27) \
_ER(CR_ACCESS, 28) \
_ER(DR_ACCESS, 29) \
_ER(IO_INSTRUCTION, 30) \
_ER(MSR_READ, 31) \
_ER(MSR_WRITE, 32) \
_ER(MWAIT_INSTRUCTION, 36) \
_ER(MONITOR_INSTRUCTION, 39) \
_ER(PAUSE_INSTRUCTION, 40) \
_ER(MCE_DURING_VMENTRY, 41) \
_ER(TPR_BELOW_THRESHOLD, 43) \
_ER(APIC_ACCESS, 44) \
_ER(EOI_INDUCED, 45) \
_ER(EPT_VIOLATION, 48) \
_ER(EPT_MISCONFIG, 49) \
_ER(INVEPT, 50) \
_ER(PREEMPTION_TIMER, 52) \
_ER(WBINVD, 54) \
_ER(XSETBV, 55) \
_ER(APIC_WRITE, 56) \
_ER(INVPCID, 58)
#define SVM_EXIT_REASONS \
_ER(EXIT_READ_CR0, 0x000) \
_ER(EXIT_READ_CR3, 0x003) \
_ER(EXIT_READ_CR4, 0x004) \
_ER(EXIT_READ_CR8, 0x008) \
_ER(EXIT_WRITE_CR0, 0x010) \
_ER(EXIT_WRITE_CR3, 0x013) \
_ER(EXIT_WRITE_CR4, 0x014) \
_ER(EXIT_WRITE_CR8, 0x018) \
_ER(EXIT_READ_DR0, 0x020) \
_ER(EXIT_READ_DR1, 0x021) \
_ER(EXIT_READ_DR2, 0x022) \
_ER(EXIT_READ_DR3, 0x023) \
_ER(EXIT_READ_DR4, 0x024) \
_ER(EXIT_READ_DR5, 0x025) \
_ER(EXIT_READ_DR6, 0x026) \
_ER(EXIT_READ_DR7, 0x027) \
_ER(EXIT_WRITE_DR0, 0x030) \
_ER(EXIT_WRITE_DR1, 0x031) \
_ER(EXIT_WRITE_DR2, 0x032) \
_ER(EXIT_WRITE_DR3, 0x033) \
_ER(EXIT_WRITE_DR4, 0x034) \
_ER(EXIT_WRITE_DR5, 0x035) \
_ER(EXIT_WRITE_DR6, 0x036) \
_ER(EXIT_WRITE_DR7, 0x037) \
_ER(EXIT_EXCP_BASE, 0x040) \
_ER(EXIT_INTR, 0x060) \
_ER(EXIT_NMI, 0x061) \
_ER(EXIT_SMI, 0x062) \
_ER(EXIT_INIT, 0x063) \
_ER(EXIT_VINTR, 0x064) \
_ER(EXIT_CR0_SEL_WRITE, 0x065) \
_ER(EXIT_IDTR_READ, 0x066) \
_ER(EXIT_GDTR_READ, 0x067) \
_ER(EXIT_LDTR_READ, 0x068) \
_ER(EXIT_TR_READ, 0x069) \
_ER(EXIT_IDTR_WRITE, 0x06a) \
_ER(EXIT_GDTR_WRITE, 0x06b) \
_ER(EXIT_LDTR_WRITE, 0x06c) \
_ER(EXIT_TR_WRITE, 0x06d) \
_ER(EXIT_RDTSC, 0x06e) \
_ER(EXIT_RDPMC, 0x06f) \
_ER(EXIT_PUSHF, 0x070) \
_ER(EXIT_POPF, 0x071) \
_ER(EXIT_CPUID, 0x072) \
_ER(EXIT_RSM, 0x073) \
_ER(EXIT_IRET, 0x074) \
_ER(EXIT_SWINT, 0x075) \
_ER(EXIT_INVD, 0x076) \
_ER(EXIT_PAUSE, 0x077) \
_ER(EXIT_HLT, 0x078) \
_ER(EXIT_INVLPG, 0x079) \
_ER(EXIT_INVLPGA, 0x07a) \
_ER(EXIT_IOIO, 0x07b) \
_ER(EXIT_MSR, 0x07c) \
_ER(EXIT_TASK_SWITCH, 0x07d) \
_ER(EXIT_FERR_FREEZE, 0x07e) \
_ER(EXIT_SHUTDOWN, 0x07f) \
_ER(EXIT_VMRUN, 0x080) \
_ER(EXIT_VMMCALL, 0x081) \
_ER(EXIT_VMLOAD, 0x082) \
_ER(EXIT_VMSAVE, 0x083) \
_ER(EXIT_STGI, 0x084) \
_ER(EXIT_CLGI, 0x085) \
_ER(EXIT_SKINIT, 0x086) \
_ER(EXIT_RDTSCP, 0x087) \
_ER(EXIT_ICEBP, 0x088) \
_ER(EXIT_WBINVD, 0x089) \
_ER(EXIT_MONITOR, 0x08a) \
_ER(EXIT_MWAIT, 0x08b) \
_ER(EXIT_MWAIT_COND, 0x08c) \
_ER(EXIT_NPF, 0x400) \
_ER(EXIT_ERR, -1)
#define _ER(reason, val) { #reason, val },
struct str_values {
const char *str;
int val;
};
static struct str_values vmx_exit_reasons[] = {
VMX_EXIT_REASONS
{ NULL, -1}
};
static struct str_values svm_exit_reasons[] = {
SVM_EXIT_REASONS
{ NULL, -1}
};
static struct isa_exit_reasons {
unsigned isa;
struct str_values *strings;
} isa_exit_reasons[] = {
{ .isa = 1, .strings = vmx_exit_reasons },
{ .isa = 2, .strings = svm_exit_reasons },
{ }
};
static const char *find_exit_reason(unsigned isa, int val)
{
struct str_values *strings = NULL;
int i;
for (i = 0; isa_exit_reasons[i].strings; ++i)
if (isa_exit_reasons[i].isa == isa) {
strings = isa_exit_reasons[i].strings;
break;
}
if (!strings)
return "UNKNOWN-ISA";
for (i = 0; strings[i].val >= 0; i++)
if (strings[i].val == val)
break;
if (strings[i].str)
return strings[i].str;
return "UNKNOWN";
}
static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
struct event_format *event, void *context)
{
unsigned long long isa;
unsigned long long val;
unsigned long long info1 = 0, info2 = 0;
if (pevent_get_field_val(s, event, "exit_reason", record, &val, 1) < 0)
return -1;
if (pevent_get_field_val(s, event, "isa", record, &isa, 0) < 0)
isa = 1;
trace_seq_printf(s, "reason %s", find_exit_reason(isa, val));
pevent_print_num_field(s, " rip 0x%lx", event, "guest_rip", record, 1);
if (pevent_get_field_val(s, event, "info1", record, &info1, 0) >= 0
&& pevent_get_field_val(s, event, "info2", record, &info2, 0) >= 0)
trace_seq_printf(s, " info %llx %llx", info1, info2);
return 0;
}
#define KVM_EMUL_INSN_F_CR0_PE (1 << 0)
#define KVM_EMUL_INSN_F_EFL_VM (1 << 1)
#define KVM_EMUL_INSN_F_CS_D (1 << 2)
#define KVM_EMUL_INSN_F_CS_L (1 << 3)
static int kvm_emulate_insn_handler(struct trace_seq *s,
struct pevent_record *record,
struct event_format *event, void *context)
{
unsigned long long rip, csbase, len, flags, failed;
int llen;
uint8_t *insn;
const char *disasm;
if (pevent_get_field_val(s, event, "rip", record, &rip, 1) < 0)
return -1;
if (pevent_get_field_val(s, event, "csbase", record, &csbase, 1) < 0)
return -1;
if (pevent_get_field_val(s, event, "len", record, &len, 1) < 0)
return -1;
if (pevent_get_field_val(s, event, "flags", record, &flags, 1) < 0)
return -1;
if (pevent_get_field_val(s, event, "failed", record, &failed, 1) < 0)
return -1;
insn = pevent_get_field_raw(s, event, "insn", record, &llen, 1);
if (!insn)
return -1;
disasm = disassemble(insn, len, rip,
flags & KVM_EMUL_INSN_F_CR0_PE,
flags & KVM_EMUL_INSN_F_EFL_VM,
flags & KVM_EMUL_INSN_F_CS_D,
flags & KVM_EMUL_INSN_F_CS_L);
trace_seq_printf(s, "%llx:%llx: %s%s", csbase, rip, disasm,
failed ? " FAIL" : "");
return 0;
}
union kvm_mmu_page_role {
unsigned word;
struct {
unsigned glevels:4;
unsigned level:4;
unsigned quadrant:2;
unsigned pad_for_nice_hex_output:6;
unsigned direct:1;
unsigned access:3;
unsigned invalid:1;
unsigned cr4_pge:1;
unsigned nxe:1;
};
};
static int kvm_mmu_print_role(struct trace_seq *s, struct pevent_record *record,
struct event_format *event, void *context)
{
unsigned long long val;
static const char *access_str[] = {
"---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"
};
union kvm_mmu_page_role role;
if (pevent_get_field_val(s, event, "role", record, &val, 1) < 0)
return -1;
role.word = (int)val;
/*
* We can only use the structure if file is of the same
* endianess.
*/
if (pevent_is_file_bigendian(event->pevent) ==
pevent_is_host_bigendian(event->pevent)) {
trace_seq_printf(s, "%u/%u q%u%s %s%s %spge %snxe",
role.level,
role.glevels,
role.quadrant,
role.direct ? " direct" : "",
access_str[role.access],
role.invalid ? " invalid" : "",
role.cr4_pge ? "" : "!",
role.nxe ? "" : "!");
} else
trace_seq_printf(s, "WORD: %08x", role.word);
pevent_print_num_field(s, " root %u ", event,
"root_count", record, 1);
if (pevent_get_field_val(s, event, "unsync", record, &val, 1) < 0)
return -1;
trace_seq_printf(s, "%s%c", val ? "unsync" : "sync", 0);
return 0;
}
static int kvm_mmu_get_page_handler(struct trace_seq *s,
struct pevent_record *record,
struct event_format *event, void *context)
{
unsigned long long val;
if (pevent_get_field_val(s, event, "created", record, &val, 1) < 0)
return -1;
trace_seq_printf(s, "%s ", val ? "new" : "existing");
if (pevent_get_field_val(s, event, "gfn", record, &val, 1) < 0)
return -1;
trace_seq_printf(s, "sp gfn %llx ", val);
return kvm_mmu_print_role(s, record, event, context);
}
#define PT_WRITABLE_SHIFT 1
#define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)
static unsigned long long
process_is_writable_pte(struct trace_seq *s, unsigned long long *args)
{
unsigned long pte = args[0];
return pte & PT_WRITABLE_MASK;
}
int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
{
init_disassembler();
pevent_register_event_handler(pevent, -1, "kvm", "kvm_exit",
kvm_exit_handler, NULL);
pevent_register_event_handler(pevent, -1, "kvm", "kvm_emulate_insn",
kvm_emulate_insn_handler, NULL);
pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_get_page",
kvm_mmu_get_page_handler, NULL);
pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_sync_page",
kvm_mmu_print_role, NULL);
pevent_register_event_handler(pevent, -1,
"kvmmmu", "kvm_mmu_unsync_page",
kvm_mmu_print_role, NULL);
pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_zap_page",
kvm_mmu_print_role, NULL);
pevent_register_event_handler(pevent, -1, "kvmmmu",
"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
NULL);
pevent_register_print_function(pevent,
process_is_writable_pte,
PEVENT_FUNC_ARG_INT,
"is_writable_pte",
PEVENT_FUNC_ARG_LONG,
PEVENT_FUNC_ARG_VOID);
return 0;
}
void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
{
pevent_unregister_event_handler(pevent, -1, "kvm", "kvm_exit",
kvm_exit_handler, NULL);
pevent_unregister_event_handler(pevent, -1, "kvm", "kvm_emulate_insn",
kvm_emulate_insn_handler, NULL);
pevent_unregister_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_get_page",
kvm_mmu_get_page_handler, NULL);
pevent_unregister_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_sync_page",
kvm_mmu_print_role, NULL);
pevent_unregister_event_handler(pevent, -1,
"kvmmmu", "kvm_mmu_unsync_page",
kvm_mmu_print_role, NULL);
pevent_unregister_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_zap_page",
kvm_mmu_print_role, NULL);
pevent_unregister_event_handler(pevent, -1, "kvmmmu",
"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
NULL);
pevent_unregister_print_function(pevent, process_is_writable_pte,
"is_writable_pte");
}
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