Currently, when the preallocating guest memory process fails, a not so helpful error message is printed out: # virsh start migt10 error: Failed to start domain migt10 error: internal error: process exited while connecting to monitor: os_mem_prealloc: failed to preallocate pages From the error message it's not clear at the first glance where the problem lies. However, changing the error message might give users a clue. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
415 lines
9.7 KiB
C
415 lines
9.7 KiB
C
/*
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* os-posix-lib.c
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2010 Red Hat, Inc.
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*
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* QEMU library functions on POSIX which are shared between QEMU and
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* the QEMU tools.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* The following block of code temporarily renames the daemon() function so the
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compiler does not see the warning associated with it in stdlib.h on OSX */
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#ifdef __APPLE__
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#define daemon qemu_fake_daemon_function
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#include <stdlib.h>
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#undef daemon
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extern int daemon(int, int);
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#endif
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#if defined(__linux__) && (defined(__x86_64__) || defined(__arm__))
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/* Use 2 MiB alignment so transparent hugepages can be used by KVM.
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Valgrind does not support alignments larger than 1 MiB,
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therefore we need special code which handles running on Valgrind. */
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# define QEMU_VMALLOC_ALIGN (512 * 4096)
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#elif defined(__linux__) && defined(__s390x__)
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/* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
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# define QEMU_VMALLOC_ALIGN (256 * 4096)
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#else
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# define QEMU_VMALLOC_ALIGN getpagesize()
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#endif
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#define HUGETLBFS_MAGIC 0x958458f6
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#include <termios.h>
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#include <unistd.h>
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#include <glib/gprintf.h>
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#include "config-host.h"
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#include "sysemu/sysemu.h"
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#include "trace.h"
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#include "qemu/sockets.h"
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#include <sys/mman.h>
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#include <libgen.h>
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#include <setjmp.h>
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#include <sys/signal.h>
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#ifdef CONFIG_LINUX
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#include <sys/syscall.h>
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#include <sys/vfs.h>
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#endif
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#ifdef __FreeBSD__
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#include <sys/sysctl.h>
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#endif
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int qemu_get_thread_id(void)
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{
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#if defined(__linux__)
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return syscall(SYS_gettid);
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#else
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return getpid();
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#endif
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}
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int qemu_daemon(int nochdir, int noclose)
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{
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return daemon(nochdir, noclose);
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}
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void *qemu_oom_check(void *ptr)
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{
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if (ptr == NULL) {
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fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
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abort();
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}
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return ptr;
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}
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void *qemu_try_memalign(size_t alignment, size_t size)
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{
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void *ptr;
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if (alignment < sizeof(void*)) {
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alignment = sizeof(void*);
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}
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#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
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int ret;
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ret = posix_memalign(&ptr, alignment, size);
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if (ret != 0) {
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errno = ret;
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ptr = NULL;
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}
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#elif defined(CONFIG_BSD)
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ptr = valloc(size);
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#else
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ptr = memalign(alignment, size);
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#endif
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trace_qemu_memalign(alignment, size, ptr);
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return ptr;
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}
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void *qemu_memalign(size_t alignment, size_t size)
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{
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return qemu_oom_check(qemu_try_memalign(alignment, size));
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}
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/* alloc shared memory pages */
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void *qemu_anon_ram_alloc(size_t size)
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{
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size_t align = QEMU_VMALLOC_ALIGN;
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size_t total = size + align - getpagesize();
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void *ptr = mmap(0, total, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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size_t offset = QEMU_ALIGN_UP((uintptr_t)ptr, align) - (uintptr_t)ptr;
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if (ptr == MAP_FAILED) {
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return NULL;
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}
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ptr += offset;
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total -= offset;
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if (offset > 0) {
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munmap(ptr - offset, offset);
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}
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if (total > size) {
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munmap(ptr + size, total - size);
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}
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trace_qemu_anon_ram_alloc(size, ptr);
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return ptr;
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}
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void qemu_vfree(void *ptr)
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{
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trace_qemu_vfree(ptr);
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free(ptr);
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}
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void qemu_anon_ram_free(void *ptr, size_t size)
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{
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trace_qemu_anon_ram_free(ptr, size);
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if (ptr) {
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munmap(ptr, size);
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}
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}
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void qemu_set_block(int fd)
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{
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int f;
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f = fcntl(fd, F_GETFL);
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fcntl(fd, F_SETFL, f & ~O_NONBLOCK);
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}
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void qemu_set_nonblock(int fd)
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{
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int f;
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f = fcntl(fd, F_GETFL);
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fcntl(fd, F_SETFL, f | O_NONBLOCK);
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}
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int socket_set_fast_reuse(int fd)
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{
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int val = 1, ret;
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ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
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(const char *)&val, sizeof(val));
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assert(ret == 0);
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return ret;
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}
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void qemu_set_cloexec(int fd)
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{
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int f;
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f = fcntl(fd, F_GETFD);
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fcntl(fd, F_SETFD, f | FD_CLOEXEC);
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}
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/*
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* Creates a pipe with FD_CLOEXEC set on both file descriptors
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*/
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int qemu_pipe(int pipefd[2])
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{
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int ret;
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#ifdef CONFIG_PIPE2
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ret = pipe2(pipefd, O_CLOEXEC);
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if (ret != -1 || errno != ENOSYS) {
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return ret;
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}
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#endif
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ret = pipe(pipefd);
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if (ret == 0) {
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qemu_set_cloexec(pipefd[0]);
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qemu_set_cloexec(pipefd[1]);
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}
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return ret;
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}
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int qemu_utimens(const char *path, const struct timespec *times)
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{
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struct timeval tv[2], tv_now;
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struct stat st;
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int i;
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#ifdef CONFIG_UTIMENSAT
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int ret;
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ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW);
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if (ret != -1 || errno != ENOSYS) {
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return ret;
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}
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#endif
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/* Fallback: use utimes() instead of utimensat() */
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/* happy if special cases */
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if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
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return 0;
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}
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if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
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return utimes(path, NULL);
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}
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/* prepare for hard cases */
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if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
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gettimeofday(&tv_now, NULL);
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}
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if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
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stat(path, &st);
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}
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for (i = 0; i < 2; i++) {
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if (times[i].tv_nsec == UTIME_NOW) {
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tv[i].tv_sec = tv_now.tv_sec;
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tv[i].tv_usec = tv_now.tv_usec;
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} else if (times[i].tv_nsec == UTIME_OMIT) {
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tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
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tv[i].tv_usec = 0;
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} else {
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tv[i].tv_sec = times[i].tv_sec;
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tv[i].tv_usec = times[i].tv_nsec / 1000;
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}
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}
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return utimes(path, &tv[0]);
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}
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char *
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qemu_get_local_state_pathname(const char *relative_pathname)
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{
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return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR,
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relative_pathname);
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}
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void qemu_set_tty_echo(int fd, bool echo)
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{
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struct termios tty;
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tcgetattr(fd, &tty);
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if (echo) {
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tty.c_lflag |= ECHO | ECHONL | ICANON | IEXTEN;
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} else {
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tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN);
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}
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tcsetattr(fd, TCSANOW, &tty);
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}
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static char exec_dir[PATH_MAX];
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void qemu_init_exec_dir(const char *argv0)
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{
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char *dir;
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char *p = NULL;
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char buf[PATH_MAX];
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assert(!exec_dir[0]);
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#if defined(__linux__)
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{
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int len;
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len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
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if (len > 0) {
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buf[len] = 0;
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p = buf;
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}
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}
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#elif defined(__FreeBSD__)
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{
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static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
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size_t len = sizeof(buf) - 1;
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*buf = '\0';
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if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) &&
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*buf) {
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buf[sizeof(buf) - 1] = '\0';
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p = buf;
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}
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}
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#endif
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/* If we don't have any way of figuring out the actual executable
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location then try argv[0]. */
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if (!p) {
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if (!argv0) {
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return;
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}
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p = realpath(argv0, buf);
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if (!p) {
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return;
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}
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}
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dir = dirname(p);
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pstrcpy(exec_dir, sizeof(exec_dir), dir);
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}
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char *qemu_get_exec_dir(void)
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{
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return g_strdup(exec_dir);
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}
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static sigjmp_buf sigjump;
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static void sigbus_handler(int signal)
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{
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siglongjmp(sigjump, 1);
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}
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static size_t fd_getpagesize(int fd)
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{
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#ifdef CONFIG_LINUX
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struct statfs fs;
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int ret;
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if (fd != -1) {
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do {
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ret = fstatfs(fd, &fs);
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} while (ret != 0 && errno == EINTR);
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if (ret == 0 && fs.f_type == HUGETLBFS_MAGIC) {
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return fs.f_bsize;
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}
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}
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#endif
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return getpagesize();
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}
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void os_mem_prealloc(int fd, char *area, size_t memory)
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{
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int ret;
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struct sigaction act, oldact;
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sigset_t set, oldset;
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memset(&act, 0, sizeof(act));
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act.sa_handler = &sigbus_handler;
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act.sa_flags = 0;
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ret = sigaction(SIGBUS, &act, &oldact);
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if (ret) {
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perror("os_mem_prealloc: failed to install signal handler");
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exit(1);
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}
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/* unblock SIGBUS */
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sigemptyset(&set);
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sigaddset(&set, SIGBUS);
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pthread_sigmask(SIG_UNBLOCK, &set, &oldset);
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if (sigsetjmp(sigjump, 1)) {
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fprintf(stderr, "os_mem_prealloc: Insufficient free host memory "
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"pages available to allocate guest RAM\n");
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exit(1);
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} else {
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int i;
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size_t hpagesize = fd_getpagesize(fd);
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/* MAP_POPULATE silently ignores failures */
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memory = (memory + hpagesize - 1) & -hpagesize;
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for (i = 0; i < (memory / hpagesize); i++) {
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memset(area + (hpagesize * i), 0, 1);
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}
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ret = sigaction(SIGBUS, &oldact, NULL);
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if (ret) {
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perror("os_mem_prealloc: failed to reinstall signal handler");
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exit(1);
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}
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pthread_sigmask(SIG_SETMASK, &oldset, NULL);
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}
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}
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