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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
#define TARGET_CORE 2
#define SECONDARY_CORE 3
extern uint8_t guest_with_start[];
extern uint8_t guest_with_stop[];
extern uint8_t guest_without_start[];
extern uint8_t guest_without_stop[];
static const char *vmtype;
uint64_t
vm_get_rip(struct kvm *kvm)
{
struct kvm_regs regs;
uint64_t rip;
int ret;
if (!strcmp(vmtype, "sev-snp")) {
rip = snp_dbg_decrypt_rip(kvm->vmfd);
} else if (!strcmp(vmtype, "sev-es")) {
rip = sev_dbg_decrypt_rip(kvm->vmfd);
} else {
ret = ioctl(kvm->vcpufd, KVM_GET_REGS, ®s);
if (ret == -1) err(1, "KVM_GET_REGS");
rip = regs.rip;
}
return rip;
}
void
vm_init(struct kvm *kvm, void *code_start, void *code_end)
{
size_t ramsize;
ramsize = L1_SIZE * 2;
if (!strcmp(vmtype, "kvm")) {
kvm_init(kvm, ramsize, code_start, code_end);
} else if (!strcmp(vmtype, "sev")) {
sev_kvm_init(kvm, ramsize, code_start, code_end);
} else if (!strcmp(vmtype, "sev-es")) {
sev_es_kvm_init(kvm, ramsize, code_start, code_end);
} else if (!strcmp(vmtype, "sev-snp")) {
sev_snp_kvm_init(kvm, ramsize, code_start, code_end);
} else {
errx(1, "invalid version");
}
}
void
vm_deinit(struct kvm *kvm)
{
kvm_deinit(kvm);
}
void
collect(struct kvm *kvm, uint8_t *counts)
{
int ret;
ret = ioctl(kvm->vcpufd, KVM_RUN, NULL);
if (ret == -1) err(1, "KVM_RUN");
// warnx("rip:%lu code:%i", vm_get_rip(kvm), kvm->run->exit_reason);
if (kvm->run->exit_reason != KVM_EXIT_HLT) {
errx(1, "KVM died! rip:%lu code:%i",
vm_get_rip(kvm), kvm->run->exit_reason);
}
ret = ioctl(kvm_dev, KVM_CPC_READ_COUNTS, counts);
if (ret == -1) err(1, "ioctl KVM_CPC_READ_COUNTS");
}
int
main(int argc, const char **argv)
{
struct kvm vms[2];
uint8_t counts[2][SAMPLE_COUNT][L1_SETS];
uint8_t baseline[L1_SETS];
int i, k, ret;
vmtype = "kvm";
if (argc > 1) vmtype = argv[1];
if (strcmp(vmtype, "kvm") && strcmp(vmtype, "sev")
&& strcmp(vmtype, "sev-es")
&& strcmp(vmtype, "sev-snp"))
errx(1, "invalid vm mode: %s", vmtype);
setvbuf(stdout, NULL, _IONBF, 0);
pin_process(0, TARGET_CORE, true);
kvm_setup_init();
vm_init(&vms[WITH], guest_with_start, guest_with_stop);
vm_init(&vms[WITHOUT], guest_without_start, guest_without_stop);
/* reset kernel module state */
ret = ioctl(kvm_dev, KVM_CPC_RESET);
if (ret == -1) err(1, "ioctl KVM_CPC_RESET");
/* 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 */
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]);
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]);
}
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]);
}
vm_deinit(&vms[WITH]);
vm_deinit(&vms[WITHOUT]);
kvm_setup_deinit();
}
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