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#include "test/kvm-eviction.h"
#include "test/kvm.h"
#include "test/util.h"
#include "cachepc/uapi.h"
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#define SAMPLE_COUNT 64
void
collect(struct kvm *kvm, uint8_t *counts)
{
int ret;
ret = ioctl(kvm->vcpufd, KVM_RUN, NULL);
if (ret == -1) err(1, "KVM_RUN");
if (kvm->run->exit_reason == KVM_EXIT_MMIO) {
errx(1, "KVM died from OOB access! rip:%lu addr:%lu",
vm_get_rip(), kvm->run->mmio.phys_addr);
} else if (kvm->run->exit_reason != KVM_EXIT_HLT) {
errx(1, "KVM died! rip:%lu code:%i",
vm_get_rip(), kvm->run->exit_reason);
}
ret = ioctl(kvm_dev, KVM_CPC_READ_COUNTS, counts);
if (ret == -1) err(1, "KVM_CPC_READ_COUNTS");
}
int
main(int argc, const char **argv)
{
struct kvm vms[2];
struct guest guests[2];
uint8_t counts[2][SAMPLE_COUNT][L1_SETS];
uint8_t baseline[L1_SETS];
struct cpc_track_cfg cfg;
int i, k, ret, exitcode;
setvbuf(stdout, NULL, _IONBF, 0);
parse_vmtype(argc, argv);
pin_process(0, TARGET_CORE, true);
kvm_setup_init();
guest_init(&guests[WITH], "test/kvm-eviction-with_guest");
vm_init(&vms[WITH], &guests[WITH]);
guest_deinit(&guests[WITH]);
guest_init(&guests[WITHOUT], "test/kvm-eviction-without_guest");
vm_init(&vms[WITHOUT], &guests[WITHOUT]);
guest_deinit(&guests[WITHOUT]);
/* reset kernel module state */
ret = ioctl(kvm_dev, KVM_CPC_RESET);
if (ret == -1) err(1, "KVM_CPC_RESET");
memset(&cfg, 0, sizeof(cfg));
cfg.mode = CPC_TRACK_EXIT_EVICTIONS;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_MODE, &cfg);
if (ret == -1) err(1, "KVM_CPC_TRACK_MODE");
/* resolve page faults in advance (code only covers 1 page)..
* we want the read counts to apply between KVM_RUN and KVM_EXIT_HLT,
* any exits through PFs inbetween will influence our measurement */
collect(&vms[WITH], counts[WITH][0]);
collect(&vms[WITHOUT], counts[WITHOUT][0]);
/* collect samples */
for (i = 0; i < SAMPLE_COUNT; i++) {
collect(&vms[WITH], counts[WITH][i]);
collect(&vms[WITHOUT], counts[WITHOUT][i]);
}
/* calculate measurement baseline */
memset(baseline, 0xff, L1_SETS);
for (i = 0; i < SAMPLE_COUNT; i++) {
for (k = 0; k < L1_SETS; k++) {
if (counts[WITH][i][k] < baseline[k])
baseline[k] = counts[WITH][i][k];
if (counts[WITHOUT][i][k] < baseline[k])
baseline[k] = counts[WITHOUT][i][k];
}
}
printf("=== Baseline ===\n\n", i);
print_counts(baseline);
printf("\n");
print_counts_raw(baseline);
printf("\n");
/* apply baseline and output samples */
for (i = 0; i < SAMPLE_COUNT; i++) {
for (k = 0; k < L1_SETS; k++) {
counts[WITH][i][k] -= baseline[k];
counts[WITHOUT][i][k] -= baseline[k];
}
printf("=== Sample %2i ===\n", i);
printf("\nWith eviction:\n\n");
print_counts(counts[WITH][i]);
printf("\n");
print_counts_raw(counts[WITH][i]);
printf("\nWithout eviction:\n\n");
print_counts(counts[WITHOUT][i]);
printf("\n");
print_counts_raw(counts[WITHOUT][i]);
printf("\n");
}
/* check for measurment errors */
exitcode = 0;
for (i = 0; i < SAMPLE_COUNT; i++) {
for (k = 0; k < L1_SETS; k++) {
if (counts[WITH][i][k] + baseline[k] > L1_ASSOC) {
warnx("sample %i: With count OOB for set %i (=%i)",
i, k, counts[WITH][i][k] + baseline[k]);
exitcode = 1;
}
if (counts[WITHOUT][i][k] + baseline[k] > L1_ASSOC) {
warnx("sample %i: Without count OOB for set %i (=%i)",
i, k, counts[WITHOUT][i][k] + baseline[k]);
exitcode = 1;
}
}
if (!counts[WITH][i][TARGET_SET]) {
warnx("sample %i: Missing eviction in target set %i (=%i,%i)",
i, TARGET_SET, counts[WITH][i][TARGET_SET],
counts[WITH][i][TARGET_SET] + baseline[TARGET_SET]);
exitcode = 1;
}
}
vm_deinit(&vms[WITH]);
vm_deinit(&vms[WITHOUT]);
ret = ioctl(kvm_dev, KVM_CPC_DEINIT);
if (ret == -1) err(1, "KVM_CPC_DEINIT");
kvm_setup_deinit();
return exitcode;
}
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