1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2017, Michael Neuling, IBM Corp.
4 * Original: Breno Leitao <brenohl@br.ibm.com> &
5 *           Gustavo Bueno Romero <gromero@br.ibm.com>
6 * Edited: Michael Neuling
7 *
8 * Force VMX unavailable during a transaction and see if it corrupts
9 * the checkpointed VMX register state after the abort.
10 */
11
12#include <inttypes.h>
13#include <htmintrin.h>
14#include <string.h>
15#include <stdlib.h>
16#include <stdio.h>
17#include <pthread.h>
18#include <sys/mman.h>
19#include <unistd.h>
20
21#include "tm.h"
22#include "utils.h"
23
24int passed;
25
26void *worker(void *unused)
27{
28	__int128 vmx0;
29	uint64_t texasr;
30
31	asm goto (
32		"li       3, 1;"  /* Stick non-zero value in VMX0 */
33		"std      3, 0(%[vmx0_ptr]);"
34		"lvx      0, 0, %[vmx0_ptr];"
35
36		/* Wait here a bit so we get scheduled out 255 times */
37		"lis      3, 0x3fff;"
38		"1: ;"
39		"addi     3, 3, -1;"
40		"cmpdi    3, 0;"
41		"bne      1b;"
42
43		/* Kernel will hopefully turn VMX off now */
44
45		"tbegin. ;"
46		"beq      failure;"
47
48		/* Cause VMX unavail. Any VMX instruction */
49		"vaddcuw  0,0,0;"
50
51		"tend. ;"
52		"b        %l[success];"
53
54		/* Check VMX0 sanity after abort */
55		"failure: ;"
56		"lvx       1,  0, %[vmx0_ptr];"
57		"vcmpequb. 2,  0, 1;"
58		"bc        4, 24, %l[value_mismatch];"
59		"b        %l[value_match];"
60		:
61		: [vmx0_ptr] "r"(&vmx0)
62		: "r3"
63		: success, value_match, value_mismatch
64		);
65
66	/* HTM aborted and VMX0 is corrupted */
67value_mismatch:
68	texasr = __builtin_get_texasr();
69
70	printf("\n\n==============\n\n");
71	printf("Failure with error: %lx\n",   _TEXASR_FAILURE_CODE(texasr));
72	printf("Summary error     : %lx\n",   _TEXASR_FAILURE_SUMMARY(texasr));
73	printf("TFIAR exact       : %lx\n\n", _TEXASR_TFIAR_EXACT(texasr));
74
75	passed = 0;
76	return NULL;
77
78	/* HTM aborted but VMX0 is correct */
79value_match:
80//	printf("!");
81	return NULL;
82
83success:
84//	printf(".");
85	return NULL;
86}
87
88int tm_vmx_unavail_test()
89{
90	int threads;
91	pthread_t *thread;
92
93	SKIP_IF(!have_htm());
94	SKIP_IF(htm_is_synthetic());
95
96	passed = 1;
97
98	threads = sysconf(_SC_NPROCESSORS_ONLN) * 4;
99	thread = malloc(sizeof(pthread_t)*threads);
100	if (!thread)
101		return EXIT_FAILURE;
102
103	for (uint64_t i = 0; i < threads; i++)
104		pthread_create(&thread[i], NULL, &worker, NULL);
105
106	for (uint64_t i = 0; i < threads; i++)
107		pthread_join(thread[i], NULL);
108
109	free(thread);
110
111	return passed ? EXIT_SUCCESS : EXIT_FAILURE;
112}
113
114
115int main(int argc, char **argv)
116{
117	return test_harness(tm_vmx_unavail_test, "tm_vmx_unavail_test");
118}
119