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