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#define _GNU_SOURCE
#include "cachepc/uapi.h"
#include <linux/psp-sev.h>
#include <linux/kvm.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <sys/user.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <dirent.h>
#include <assert.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <sched.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>
#define ARRLEN(x) (sizeof(x) / sizeof((x)[0]))
#define MIN(a,b) ((a) > (b) ? (b) : (a))
#define TARGET_CORE 2
#define SECONDARY_CORE 3
#define TARGET_SET 15
/* ioctl dev fds */
static int kvm_dev;
static int faultcnt;
void
hexdump(void *data, int len)
{
int i;
for (i = 0; i < len; i++) {
if (i % 16 == 0 && i)
printf("\n");
printf("%02X ", *(uint8_t *)(data + i));
}
printf("\n");
}
bool
pin_process(pid_t pid, int cpu, bool assert)
{
cpu_set_t cpuset;
int ret;
CPU_ZERO(&cpuset);
CPU_SET(cpu, &cpuset);
ret = sched_setaffinity(pid, sizeof(cpu_set_t), &cpuset);
if (ret < 0) {
if (assert) err(1, "sched_setaffinity");
return false;
}
return true;
}
cpc_msrmt_t *
read_counts()
{
cpc_msrmt_t *counts;
int i, ret;
counts = malloc(L1_SETS * sizeof(cpc_msrmt_t));
if (!counts) err(1, "malloc");
ret = ioctl(kvm_dev, KVM_CPC_READ_COUNTS, counts);
if (ret == -1) err(1, "ioctl READ_COUNTS");
for (i = 0; i < L1_SETS; i++) {
if (counts[i] > 8)
errx(1, "Invalid counts set %i", i);
}
return counts;
}
void
print_counts(cpc_msrmt_t *counts)
{
int i;
for (i = 0; i < 64; i++) {
if (i % 16 == 0 && i)
printf("\n");
if (counts[i] == 1)
printf("\x1b[38;5;88m");
else if (counts[i] > 1)
printf("\x1b[38;5;196m");
printf("%2i ", i);
if (counts[i] > 0)
printf("\x1b[0m");
}
printf("\n");
}
void
print_counts_raw(cpc_msrmt_t *counts)
{
int i;
for (i = 0; i < 64; i++) {
if (i % 16 == 0 && i)
printf("\n");
if (counts[i] == 1)
printf("\x1b[38;5;88m");
else if (counts[i] > 1)
printf("\x1b[38;5;196m");
printf("%02X ", (uint8_t) counts[i]);
if (counts[i] > 0)
printf("\x1b[0m");
}
printf("\n");
}
int
monitor(bool baseline)
{
struct cpc_event event;
cpc_msrmt_t counts[64];
uint64_t track_mode;
uint32_t arg;
int ret, i;
/* Get page fault info */
ret = ioctl(kvm_dev, KVM_CPC_POLL_EVENT, &event);
if (!ret) {
if (event.type == CPC_EVENT_CPUID) {
printf("CPUID EVENT\n");
if (event.guest.type == CPC_CPUID_START_TRACK) {
arg = CPC_TRACK_DATA_ACCESS;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_MODE, &arg);
if (ret == -1) err(1, "ioctl TRACK_MODE");
track_mode = KVM_PAGE_TRACK_ACCESS;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_ALL, &track_mode);
if (ret) err(1, "ioctl TRACK_ALL");
} else if (event.guest.type == CPC_CPUID_STOP_TRACK) {
arg = CPC_TRACK_NONE;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_MODE, &arg);
if (ret == -1) err(1, "ioctl TRACK_MODE");
track_mode = KVM_PAGE_TRACK_ACCESS;
ret = ioctl(kvm_dev, KVM_CPC_UNTRACK_ALL, &track_mode);
if (ret) err(1, "ioctl UNTRACK_ALL");
}
ret = ioctl(kvm_dev, KVM_CPC_ACK_EVENT, &event.id);
if (ret == -1) err(1, "ioctl ACK_EVENT");
return 0;
} else if (event.type != CPC_EVENT_TRACK) {
return 0;
}
printf("EVENT\n");
ret = ioctl(kvm_dev, KVM_CPC_READ_COUNTS, counts);
if (ret == -1) err(1, "ioctl READ_COUNTS");
if (!baseline) {
printf("Event: inst:%llu data:%llu retired:%llu\n",
event.track.inst_fault_gfn,
event.track.data_fault_gfn,
event.track.retinst);
print_counts(counts);
printf("\n");
}
for (i = 0; i < 64; i++) {
if (counts[i] > 8) {
errx(1, "Invalid count for set %i (%llu)",
i, counts[i]);
}
}
ret = ioctl(kvm_dev, KVM_CPC_ACK_EVENT, &event.id);
if (ret == -1) err(1, "ioctl ACK_EVENT");
faultcnt++;
} else if (errno != EAGAIN) {
perror("ioctl POLL_EVENT");
return 1;
}
return 0;
}
int
main(int argc, const char **argv)
{
pid_t pid;
uint32_t arg;
struct cpc_event event;
cpc_msrmt_t baseline[64];
int ret, i;
if (argc <= 1 || !atoi(argv[1])) {
printf("Specify qemu process to pin\n");
return 0;
}
kvm_dev = open("/dev/kvm", O_RDWR);
if (!kvm_dev) err(1, "open /dev/kvm");
setvbuf(stdout, NULL, _IONBF, 0);
pid = atoi(argv[1]);
pin_process(pid, TARGET_CORE, true);
pin_process(0, TARGET_CORE, true);
/* Setup needed performance counters */
ret = ioctl(kvm_dev, KVM_CPC_SETUP_PMC, NULL);
if (ret < 0) err(1, "ioctl SETUP_PMC");
/* Reset previous tracking */
ret = ioctl(kvm_dev, KVM_CPC_RESET_TRACKING, NULL);
if (ret == -1) err(1, "ioctl RESET_TRACKING");
pin_process(0, SECONDARY_CORE, true);
printf("PINNED\n");
arg = false;
ret = ioctl(kvm_dev, KVM_CPC_SUB_BASELINE, &arg);
if (ret == -1) err(1, "ioctl SUB_BASELINE");
arg = true;
ret = ioctl(kvm_dev, KVM_CPC_MEASURE_BASELINE, &arg);
if (ret == -1) err(1, "ioctl MEASURE_BASELINE");
arg = KVM_PAGE_TRACK_ACCESS;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_ALL, &arg);
if (ret) err(1, "ioctl TRACK_ALL");
arg = CPC_TRACK_DATA_ACCESS;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_MODE, &arg);
if (ret == -1) err(1, "ioctl TRACK_MODE");
faultcnt = 0;
while (faultcnt < 100) {
if (monitor(true)) break;
}
do {
ret = ioctl(kvm_dev, KVM_CPC_POLL_EVENT, &event);
if (ret == -1 && errno != EAGAIN)
err(1, "ioctl POLL_EVENT");
} while (ret == -1 && errno == EAGAIN);
arg = CPC_TRACK_NONE;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_MODE, &arg);
if (ret == -1) err(1, "ioctl TRACK_MODE");
arg = KVM_PAGE_TRACK_ACCESS;
ret = ioctl(kvm_dev, KVM_CPC_UNTRACK_ALL, &arg);
if (ret) err(1, "ioctl TRACK_ALL");
arg = false;
ret = ioctl(kvm_dev, KVM_CPC_MEASURE_BASELINE, &arg);
if (ret == -1) err(1, "ioctl MEASURE_BASELINE");
ret = ioctl(kvm_dev, KVM_CPC_READ_BASELINE, baseline);
if (ret == -1) err(1, "ioctl READ_BASELINE");
printf("\n>>> BASELINE:\n");
print_counts(baseline);
printf("\n");
print_counts_raw(baseline);
printf("\n");
/* Check baseline for saturated sets */
for (i = 0; i < 64; i++) {
if (baseline[i] >= 8)
errx(1, "!!! Baseline set %i full\n", i);
}
arg = true;
ret = ioctl(kvm_dev, KVM_CPC_SUB_BASELINE, &arg);
if (ret == -1) err(1, "ioctl SUB_BASELINE");
ret = ioctl(kvm_dev, KVM_CPC_ACK_EVENT, &event.id);
if (ret == -1) err(1, "ioctl ACK_EVENT");
faultcnt = 0;
while (faultcnt < 10) {
if (monitor(false)) break;
}
}
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