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#define _GNU_SOURCE
#include "test/kvm.h"
#include "test/util.h"
#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 TARGET_CORE 2
#define SECONDARY_CORE 3
extern uint8_t guest_start[];
extern uint8_t guest_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_dev, KVM_CPC_GET_REGS, ®s);
if (ret == -1) err(1, "KVM_CPC_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);
}
uint64_t
monitor(struct kvm *kvm, bool baseline)
{
struct cpc_event event;
uint8_t counts[64];
int ret;
/* Get page fault info */
ret = ioctl(kvm_dev, KVM_CPC_POLL_EVENT, &event);
if (ret && errno == EAGAIN) return 0;
if (ret) err(1, "ioctl KVM_CPC_POLL_EVENT");
if (event.type != CPC_EVENT_TRACK_STEP)
errx(1, "unexpected event type %i", event.type);
ret = ioctl(kvm_dev, KVM_CPC_READ_COUNTS, counts);
if (ret) err(1, "ioctl KVM_CPC_READ_COUNTS");
printf("Event: rip:%llu cnt:%llu inst:%llu data:%llu ret:%llu\n",
vm_get_rip(kvm), event.step.fault_count,
event.step.fault_gfns[0], event.step.fault_gfns[1],
event.step.retinst);
print_counts(counts);
printf("\n");
ret = ioctl(kvm_dev, KVM_CPC_ACK_EVENT, &event.id);
if (ret) err(1, "ioctl KVM_CPC_ACK_EVENT");
return 1;
}
int
main(int argc, const char **argv)
{
struct kvm kvm;
uint8_t baseline[L1_SETS];
struct cpc_event event;
uint64_t eventcnt;
pid_t ppid, pid;
uint32_t arg;
int 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(&kvm, guest_start, guest_stop);
/* reset kernel module state */
ret = ioctl(kvm_dev, KVM_CPC_RESET, NULL);
if (ret < 0) err(1, "ioctl KVM_CPC_RESET");
ppid = getpid();
if ((pid = fork())) {
if (pid < 0) err(1, "fork");
sleep(1); /* give time for child to pin other core */
printf("VM start\n");
do {
ret = ioctl(kvm.vcpufd, KVM_RUN, NULL);
if (ret < 0) err(1, "KVM_RUN");
if (kvm.run->exit_reason == KVM_EXIT_HLT)
printf("VM halt\n");
} while (kvm.run->exit_reason == KVM_EXIT_HLT);
printf("VM exit\n");
} else {
pin_process(0, SECONDARY_CORE, true);
/* capture baseline by just letting it fault over and over */
arg = CPC_TRACK_FAULT_NO_RUN;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_MODE, &arg);
if (ret) err(1, "ioctl KVM_CPC_TRACK_MODE");
/* calculate baseline while running vm */
arg = true;
ret = ioctl(kvm_dev, KVM_CPC_CALC_BASELINE, &arg);
if (ret) err(1, "ioctl KVM_CPC_CALC_BASELINE");
printf("Monitor ready\n");
/* run vm while baseline is calculated */
eventcnt = 0;
while (eventcnt < 50) {
eventcnt += monitor(&kvm, true);
}
printf("Baseline done\n");
ret = ioctl(kvm_dev, KVM_CPC_VM_REQ_PAUSE);
if (ret) err(1, "ioctl KVM_CPC_VM_REQ_PAUSE");
while (1) {
ret = ioctl(kvm_dev, KVM_CPC_POLL_EVENT, &event);
if (ret && errno == EAGAIN) continue;
if (ret) err(1, "ioctl KVM_CPC_POLL_EVENT");
if (event.type == CPC_EVENT_PAUSE) break;
printf("Skipping non-pause event..\n");
ret = ioctl(kvm_dev, KVM_CPC_ACK_EVENT, &event.id);
if (ret) err(1, "ioctl KVM_CPC_ACK_EVENT");
}
arg = false;
ret = ioctl(kvm_dev, KVM_CPC_CALC_BASELINE, &arg);
if (ret) err(1, "ioctl KVM_CPC_CALC_BASELINE");
ret = ioctl(kvm_dev, KVM_CPC_READ_BASELINE, baseline);
if (ret) err(1, "ioctl KVM_CPC_READ_BASELINE");
printf("\nBaseline:\n");
print_counts(baseline);
printf("\n");
print_counts_raw(baseline);
printf("\n\n");
arg = true;
ret = ioctl(kvm_dev, KVM_CPC_APPLY_BASELINE, &arg);
if (ret) err(1, "ioctl KMV_CPC_APPLY_BASELINE");
/* single step and log all accessed pages */
arg = CPC_TRACK_FULL;
ret = ioctl(kvm_dev, KVM_CPC_TRACK_MODE, &arg);
if (ret) err(1, "ioctl KVM_CPC_TRACK_MODE");
ret = ioctl(kvm_dev, KVM_CPC_ACK_EVENT, &event.id);
if (ret) err(1, "ioctl KVM_CPC_ACK_EVENT");
eventcnt = 0;
while (eventcnt < 50) {
eventcnt += monitor(&kvm, false);
}
kill(ppid, SIGINT);
exit(0);
}
vm_deinit(&kvm);
kvm_setup_deinit();
}
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