// 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()); SKIP_IF(htm_is_synthetic()); 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"); }