71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/perf_event.h>
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#include <cpuid.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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int main(void)
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{
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struct perf_event_attr ret_attr, mret_attr;
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long long count_rets, count_rets_mispred;
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int rrets_fd, mrrets_fd;
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unsigned int cpuid1_eax, b, c, d;
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__cpuid(1, cpuid1_eax, b, c, d);
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if (cpuid1_eax < 0x00800f00 ||
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cpuid1_eax > 0x00afffff) {
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fprintf(stderr, "This needs to run on a Zen[1-4] machine (CPUID(1).EAX: 0x%x). Exiting...\n", cpuid1_eax);
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exit(EXIT_FAILURE);
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}
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memset(&ret_attr, 0, sizeof(struct perf_event_attr));
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memset(&mret_attr, 0, sizeof(struct perf_event_attr));
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ret_attr.type = mret_attr.type = PERF_TYPE_RAW;
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ret_attr.size = mret_attr.size = sizeof(struct perf_event_attr);
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ret_attr.config = 0xc8;
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mret_attr.config = 0xc9;
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ret_attr.disabled = mret_attr.disabled = 1;
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ret_attr.exclude_user = mret_attr.exclude_user = 1;
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ret_attr.exclude_hv = mret_attr.exclude_hv = 1;
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rrets_fd = syscall(SYS_perf_event_open, &ret_attr, 0, -1, -1, 0);
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if (rrets_fd == -1) {
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perror("opening retired RETs fd");
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exit(EXIT_FAILURE);
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}
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mrrets_fd = syscall(SYS_perf_event_open, &mret_attr, 0, -1, -1, 0);
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if (mrrets_fd == -1) {
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perror("opening retired mispredicted RETs fd");
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exit(EXIT_FAILURE);
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}
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ioctl(rrets_fd, PERF_EVENT_IOC_RESET, 0);
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ioctl(mrrets_fd, PERF_EVENT_IOC_RESET, 0);
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ioctl(rrets_fd, PERF_EVENT_IOC_ENABLE, 0);
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ioctl(mrrets_fd, PERF_EVENT_IOC_ENABLE, 0);
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printf("Sleeping for 10 seconds\n");
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sleep(10);
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ioctl(rrets_fd, PERF_EVENT_IOC_DISABLE, 0);
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ioctl(mrrets_fd, PERF_EVENT_IOC_DISABLE, 0);
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read(rrets_fd, &count_rets, sizeof(long long));
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read(mrrets_fd, &count_rets_mispred, sizeof(long long));
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printf("RETs: (%lld retired <-> %lld mispredicted)\n",
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count_rets, count_rets_mispred);
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printf("SRSO Safe-RET mitigation works correctly if both counts are almost equal.\n");
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return 0;
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}
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