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linux/tools/lib/traceevent/plugins/plugin_kvm.c
Sean Christopherson 167f8a5cae KVM: x86/mmu: Rename "nxe" role bit to "efer_nx" for macro shenanigans 
Rename "nxe" to "efer_nx" so that future macro magic can use the pattern
<reg>_<bit> for all CR0, CR4, and EFER bits that included in the role.
Using "efer_nx" also makes it clear that the role bit reflects EFER.NX,
not the NX bit in the corresponding PTE.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-25-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-06-24 18:00:41 -04:00

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// SPDX-License-Identifier: LGPL-2.1
/*
* Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "event-parse.h"
#include "trace-seq.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) \
_ER(PML_FULL, 62) \
_ER(XSAVES, 63) \
_ER(XRSTORS, 64)
#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_DE, 0x040) \
_ER(EXIT_EXCP_DB, 0x041) \
_ER(EXIT_EXCP_BP, 0x043) \
_ER(EXIT_EXCP_OF, 0x044) \
_ER(EXIT_EXCP_BR, 0x045) \
_ER(EXIT_EXCP_UD, 0x046) \
_ER(EXIT_EXCP_NM, 0x047) \
_ER(EXIT_EXCP_DF, 0x048) \
_ER(EXIT_EXCP_TS, 0x04a) \
_ER(EXIT_EXCP_NP, 0x04b) \
_ER(EXIT_EXCP_SS, 0x04c) \
_ER(EXIT_EXCP_GP, 0x04d) \
_ER(EXIT_EXCP_PF, 0x04e) \
_ER(EXIT_EXCP_MF, 0x050) \
_ER(EXIT_EXCP_AC, 0x051) \
_ER(EXIT_EXCP_MC, 0x052) \
_ER(EXIT_EXCP_XF, 0x053) \
_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_XSETBV, 0x08d) \
_ER(EXIT_NPF, 0x400) \
_ER(EXIT_AVIC_INCOMPLETE_IPI, 0x401) \
_ER(EXIT_AVIC_UNACCELERATED_ACCESS, 0x402) \
_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].str; i++)
if (strings[i].val == val)
break;
return strings[i].str;
}
static int print_exit_reason(struct trace_seq *s, struct tep_record *record,
struct tep_event *event, const char *field)
{
unsigned long long isa;
unsigned long long val;
const char *reason;
if (tep_get_field_val(s, event, field, record, &val, 1) < 0)
return -1;
if (tep_get_field_val(s, event, "isa", record, &isa, 0) < 0)
isa = 1;
reason = find_exit_reason(isa, val);
if (reason)
trace_seq_printf(s, "reason %s", reason);
else
trace_seq_printf(s, "reason UNKNOWN (%llu)", val);
return 0;
}
static int kvm_exit_handler(struct trace_seq *s, struct tep_record *record,
struct tep_event *event, void *context)
{
unsigned long long info1 = 0, info2 = 0;
if (print_exit_reason(s, record, event, "exit_reason") < 0)
return -1;
tep_print_num_field(s, " rip 0x%lx", event, "guest_rip", record, 1);
if (tep_get_field_val(s, event, "info1", record, &info1, 0) >= 0
&& tep_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 tep_record *record,
struct tep_event *event, void *context)
{
unsigned long long rip, csbase, len, flags, failed;
int llen;
uint8_t *insn;
const char *disasm;
if (tep_get_field_val(s, event, "rip", record, &rip, 1) < 0)
return -1;
if (tep_get_field_val(s, event, "csbase", record, &csbase, 1) < 0)
return -1;
if (tep_get_field_val(s, event, "len", record, &len, 1) < 0)
return -1;
if (tep_get_field_val(s, event, "flags", record, &flags, 1) < 0)
return -1;
if (tep_get_field_val(s, event, "failed", record, &failed, 1) < 0)
return -1;
insn = tep_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;
}
static int kvm_nested_vmexit_inject_handler(struct trace_seq *s, struct tep_record *record,
struct tep_event *event, void *context)
{
if (print_exit_reason(s, record, event, "exit_code") < 0)
return -1;
tep_print_num_field(s, " info1 %llx", event, "exit_info1", record, 1);
tep_print_num_field(s, " info2 %llx", event, "exit_info2", record, 1);
tep_print_num_field(s, " int_info %llx", event, "exit_int_info", record, 1);
tep_print_num_field(s, " int_info_err %llx", event, "exit_int_info_err", record, 1);
return 0;
}
static int kvm_nested_vmexit_handler(struct trace_seq *s, struct tep_record *record,
struct tep_event *event, void *context)
{
tep_print_num_field(s, "rip %llx ", event, "rip", record, 1);
return kvm_nested_vmexit_inject_handler(s, record, event, context);
}
union kvm_mmu_page_role {
unsigned word;
struct {
unsigned level:4;
unsigned cr4_pae:1;
unsigned quadrant:2;
unsigned direct:1;
unsigned access:3;
unsigned invalid:1;
unsigned efer_nx:1;
unsigned cr0_wp:1;
unsigned smep_and_not_wp:1;
unsigned smap_and_not_wp:1;
unsigned pad_for_nice_hex_output:8;
unsigned smm:8;
};
};
static int kvm_mmu_print_role(struct trace_seq *s, struct tep_record *record,
struct tep_event *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 (tep_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
* endianness.
*/
if (tep_is_file_bigendian(event->tep) ==
tep_is_local_bigendian(event->tep)) {
trace_seq_printf(s, "%u q%u%s %s%s %spae %snxe %swp%s%s%s",
role.level,
role.quadrant,
role.direct ? " direct" : "",
access_str[role.access],
role.invalid ? " invalid" : "",
role.cr4_pae ? "" : "!",
role.efer_nx ? "" : "!",
role.cr0_wp ? "" : "!",
role.smep_and_not_wp ? " smep" : "",
role.smap_and_not_wp ? " smap" : "",
role.smm ? " smm" : "");
} else
trace_seq_printf(s, "WORD: %08x", role.word);
tep_print_num_field(s, " root %u ", event,
"root_count", record, 1);
if (tep_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 tep_record *record,
struct tep_event *event, void *context)
{
unsigned long long val;
if (tep_get_field_val(s, event, "created", record, &val, 1) < 0)
return -1;
trace_seq_printf(s, "%s ", val ? "new" : "existing");
if (tep_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 TEP_PLUGIN_LOADER(struct tep_handle *tep)
{
init_disassembler();
tep_register_event_handler(tep, -1, "kvm", "kvm_exit",
kvm_exit_handler, NULL);
tep_register_event_handler(tep, -1, "kvm", "kvm_emulate_insn",
kvm_emulate_insn_handler, NULL);
tep_register_event_handler(tep, -1, "kvm", "kvm_nested_vmexit",
kvm_nested_vmexit_handler, NULL);
tep_register_event_handler(tep, -1, "kvm", "kvm_nested_vmexit_inject",
kvm_nested_vmexit_inject_handler, NULL);
tep_register_event_handler(tep, -1, "kvmmmu", "kvm_mmu_get_page",
kvm_mmu_get_page_handler, NULL);
tep_register_event_handler(tep, -1, "kvmmmu", "kvm_mmu_sync_page",
kvm_mmu_print_role, NULL);
tep_register_event_handler(tep, -1,
"kvmmmu", "kvm_mmu_unsync_page",
kvm_mmu_print_role, NULL);
tep_register_event_handler(tep, -1, "kvmmmu", "kvm_mmu_zap_page",
kvm_mmu_print_role, NULL);
tep_register_event_handler(tep, -1, "kvmmmu",
"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
NULL);
tep_register_print_function(tep,
process_is_writable_pte,
TEP_FUNC_ARG_INT,
"is_writable_pte",
TEP_FUNC_ARG_LONG,
TEP_FUNC_ARG_VOID);
return 0;
}
void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
{
tep_unregister_event_handler(tep, -1, "kvm", "kvm_exit",
kvm_exit_handler, NULL);
tep_unregister_event_handler(tep, -1, "kvm", "kvm_emulate_insn",
kvm_emulate_insn_handler, NULL);
tep_unregister_event_handler(tep, -1, "kvm", "kvm_nested_vmexit",
kvm_nested_vmexit_handler, NULL);
tep_unregister_event_handler(tep, -1, "kvm", "kvm_nested_vmexit_inject",
kvm_nested_vmexit_inject_handler, NULL);
tep_unregister_event_handler(tep, -1, "kvmmmu", "kvm_mmu_get_page",
kvm_mmu_get_page_handler, NULL);
tep_unregister_event_handler(tep, -1, "kvmmmu", "kvm_mmu_sync_page",
kvm_mmu_print_role, NULL);
tep_unregister_event_handler(tep, -1,
"kvmmmu", "kvm_mmu_unsync_page",
kvm_mmu_print_role, NULL);
tep_unregister_event_handler(tep, -1, "kvmmmu", "kvm_mmu_zap_page",
kvm_mmu_print_role, NULL);
tep_unregister_event_handler(tep, -1, "kvmmmu",
"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
NULL);
tep_unregister_print_function(tep, process_is_writable_pte,
"is_writable_pte");
}
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