diff options
| -rw-r--r-- | hw/virtio/vhost.c | 8 | ||||
| -rw-r--r-- | include/qemu/memfd.h | 5 | ||||
| -rw-r--r-- | util/memfd.c | 57 |
3 files changed, 40 insertions, 30 deletions
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index d16c0c813d..338e4395b7 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -330,6 +330,7 @@ static uint64_t vhost_get_log_size(struct vhost_dev *dev) static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) { + Error *err = NULL; struct vhost_log *log; uint64_t logsize = size * sizeof(*(log->log)); int fd = -1; @@ -338,7 +339,12 @@ static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) if (share) { log->log = qemu_memfd_alloc("vhost-log", logsize, F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, - &fd); + &fd, &err); + if (err) { + error_report_err(err); + g_free(log); + return NULL; + } memset(log->log, 0, logsize); } else { log->log = g_malloc0(logsize); diff --git a/include/qemu/memfd.h b/include/qemu/memfd.h index 41c24d807c..b9d09873b5 100644 --- a/include/qemu/memfd.h +++ b/include/qemu/memfd.h @@ -16,9 +16,10 @@ #define F_SEAL_WRITE 0x0008 /* prevent writes */ #endif -int qemu_memfd_create(const char *name, size_t size, unsigned int seals); +int qemu_memfd_create(const char *name, size_t size, unsigned int seals, + Error **errp); void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals, - int *fd); + int *fd, Error **errp); void qemu_memfd_free(void *ptr, size_t size, int fd); bool qemu_memfd_check(void); diff --git a/util/memfd.c b/util/memfd.c index dce61f9d21..8d27307137 100644 --- a/util/memfd.c +++ b/util/memfd.c @@ -27,6 +27,7 @@ #include "qemu/osdep.h" +#include "qapi/error.h" #include "qemu/memfd.h" #if defined CONFIG_LINUX && !defined CONFIG_MEMFD @@ -51,11 +52,11 @@ static int memfd_create(const char *name, unsigned int flags) #define MFD_ALLOW_SEALING 0x0002U #endif -int qemu_memfd_create(const char *name, size_t size, unsigned int seals) +int qemu_memfd_create(const char *name, size_t size, + unsigned int seals, Error **errp) { - int mfd = -1; - #ifdef CONFIG_LINUX + int mfd = -1; unsigned int flags = MFD_CLOEXEC; if (seals) { @@ -64,23 +65,26 @@ int qemu_memfd_create(const char *name, size_t size, unsigned int seals) mfd = memfd_create(name, flags); if (mfd < 0) { - return -1; + goto err; } if (ftruncate(mfd, size) == -1) { - perror("ftruncate"); - close(mfd); - return -1; + goto err; } if (seals && fcntl(mfd, F_ADD_SEALS, seals) == -1) { - perror("fcntl"); - close(mfd); - return -1; + goto err; } -#endif return mfd; + +err: + if (mfd >= 0) { + close(mfd); + } +#endif + error_setg_errno(errp, errno, "failed to create memfd"); + return -1; } /* @@ -90,14 +94,14 @@ int qemu_memfd_create(const char *name, size_t size, unsigned int seals) * sealing. */ void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals, - int *fd) + int *fd, Error **errp) { void *ptr; - int mfd = qemu_memfd_create(name, size, seals); + int mfd = qemu_memfd_create(name, size, seals, NULL); /* some systems have memfd without sealing */ if (mfd == -1) { - mfd = qemu_memfd_create(name, size, 0); + mfd = qemu_memfd_create(name, size, 0, NULL); } if (mfd == -1) { @@ -109,27 +113,26 @@ void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals, unlink(fname); g_free(fname); - if (mfd == -1) { - perror("mkstemp"); - return NULL; - } - - if (ftruncate(mfd, size) == -1) { - perror("ftruncate"); - close(mfd); - return NULL; + if (mfd == -1 || + ftruncate(mfd, size) == -1) { + goto err; } } ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0); if (ptr == MAP_FAILED) { - perror("mmap"); - close(mfd); - return NULL; + goto err; } *fd = mfd; return ptr; + +err: + error_setg_errno(errp, errno, "failed to allocate shared memory"); + if (mfd >= 0) { + close(mfd); + } + return NULL; } void qemu_memfd_free(void *ptr, size_t size, int fd) @@ -157,7 +160,7 @@ bool qemu_memfd_check(void) int fd; void *ptr; - ptr = qemu_memfd_alloc("test", 4096, 0, &fd); + ptr = qemu_memfd_alloc("test", 4096, 0, &fd, NULL); memfd_check = ptr ? MEMFD_OK : MEMFD_KO; qemu_memfd_free(ptr, 4096, fd); } |