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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2017, Michael Neuling, IBM Corp.
* Original: Breno Leitao <brenohl@br.ibm.com> &
* Gustavo Bueno Romero <gromero@br.ibm.com>
* Edited: Michael Neuling
*
* Force VMX unavailable during a transaction and see if it corrupts
* the checkpointed VMX register state after the abort.
*/
#include <inttypes.h>
#include <htmintrin.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <sys/mman.h>
#include <unistd.h>
#include "tm.h"
#include "utils.h"
int passed;
void *worker(void *unused)
{
__int128 vmx0;
uint64_t texasr;
asm goto (
"li 3, 1;" /* Stick non-zero value in VMX0 */
"std 3, 0(%[vmx0_ptr]);"
"lvx 0, 0, %[vmx0_ptr];"
/* Wait here a bit so we get scheduled out 255 times */
"lis 3, 0x3fff;"
"1: ;"
"addi 3, 3, -1;"
"cmpdi 3, 0;"
"bne 1b;"
/* Kernel will hopefully turn VMX off now */
"tbegin. ;"
"beq failure;"
/* Cause VMX unavail. Any VMX instruction */
"vaddcuw 0,0,0;"
"tend. ;"
"b %l[success];"
/* Check VMX0 sanity after abort */
"failure: ;"
"lvx 1, 0, %[vmx0_ptr];"
"vcmpequb. 2, 0, 1;"
"bc 4, 24, %l[value_mismatch];"
"b %l[value_match];"
:
: [vmx0_ptr] "r"(&vmx0)
: "r3"
: success, value_match, value_mismatch
);
/* HTM aborted and VMX0 is corrupted */
value_mismatch:
texasr = __builtin_get_texasr();
printf("\n\n==============\n\n");
printf("Failure with error: %lx\n", _TEXASR_FAILURE_CODE(texasr));
printf("Summary error : %lx\n", _TEXASR_FAILURE_SUMMARY(texasr));
printf("TFIAR exact : %lx\n\n", _TEXASR_TFIAR_EXACT(texasr));
passed = 0;
return NULL;
/* HTM aborted but VMX0 is correct */
value_match:
// printf("!");
return NULL;
success:
// printf(".");
return NULL;
}
int tm_vmx_unavail_test()
{
int threads;
pthread_t *thread;
SKIP_IF(!have_htm());
passed = 1;
threads = sysconf(_SC_NPROCESSORS_ONLN) * 4;
thread = malloc(sizeof(pthread_t)*threads);
if (!thread)
return EXIT_FAILURE;
for (uint64_t i = 0; i < threads; i++)
pthread_create(&thread[i], NULL, &worker, NULL);
for (uint64_t i = 0; i < threads; i++)
pthread_join(thread[i], NULL);
free(thread);
return passed ? EXIT_SUCCESS : EXIT_FAILURE;
}
int main(int argc, char **argv)
{
return test_harness(tm_vmx_unavail_test, "tm_vmx_unavail_test");
}
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