cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mmcr2_fcs_fch_test.c (1882B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2022, Madhavan Srinivasan, IBM Corp.
      4 */
      5
      6#include <signal.h>
      7#include <stdio.h>
      8#include <stdlib.h>
      9#include <sys/types.h>
     10
     11#include "../event.h"
     12#include "misc.h"
     13#include "utils.h"
     14
     15extern void thirty_two_instruction_loop(int loops);
     16
     17static bool is_hv;
     18
     19static void sig_usr2_handler(int signum, siginfo_t *info, void *data)
     20{
     21	ucontext_t *uctx = data;
     22
     23	is_hv = !!(uctx->uc_mcontext.gp_regs[PT_MSR] & MSR_HV);
     24}
     25
     26/*
     27 * A perf sampling test for mmcr2
     28 * fields : fcs, fch.
     29 */
     30static int mmcr2_fcs_fch(void)
     31{
     32	struct sigaction sigact = {
     33		.sa_sigaction = sig_usr2_handler,
     34		.sa_flags = SA_SIGINFO
     35	};
     36	struct event event;
     37	u64 *intr_regs;
     38
     39	FAIL_IF(sigaction(SIGUSR2, &sigact, NULL));
     40	FAIL_IF(kill(getpid(), SIGUSR2));
     41
     42	/* Check for platform support for the test */
     43	SKIP_IF(check_pvr_for_sampling_tests());
     44
     45	/* Init the event for the sampling test */
     46	event_init_sampling(&event, 0x1001e);
     47	event.attr.sample_regs_intr = platform_extended_mask;
     48	event.attr.exclude_kernel = 1;
     49	FAIL_IF(event_open(&event));
     50	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
     51
     52	FAIL_IF(event_enable(&event));
     53
     54	/* workload to make the event overflow */
     55	thirty_two_instruction_loop(10000);
     56
     57	FAIL_IF(event_disable(&event));
     58
     59	/* Check for sample count */
     60	FAIL_IF(!collect_samples(event.mmap_buffer));
     61
     62	intr_regs = get_intr_regs(&event, event.mmap_buffer);
     63
     64	/* Check for intr_regs */
     65	FAIL_IF(!intr_regs);
     66
     67	/*
     68	 * Verify that fcs and fch field of MMCR2 match
     69	 * with corresponding modifier fields.
     70	 */
     71	if (is_hv)
     72		FAIL_IF(event.attr.exclude_kernel !=
     73			get_mmcr2_fch(get_reg_value(intr_regs, "MMCR2"), 1));
     74	else
     75		FAIL_IF(event.attr.exclude_kernel !=
     76			get_mmcr2_fcs(get_reg_value(intr_regs, "MMCR2"), 1));
     77
     78	event_close(&event);
     79	return 0;
     80}
     81
     82int main(void)
     83{
     84	return test_harness(mmcr2_fcs_fch, "mmcr2_fcs_fch");
     85}