diff options
| -rw-r--r-- | hw/virtio/vhost.c | 3 | ||||
| -rw-r--r-- | include/qemu/memfd.h | 2 | ||||
| -rw-r--r-- | util/memfd.c | 22 |
3 files changed, 27 insertions, 0 deletions
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 2e78e4b706..feeaaa4186 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -1019,6 +1019,9 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque, if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { error_setg(&hdev->migration_blocker, "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); + } else if (!qemu_memfd_check()) { + error_setg(&hdev->migration_blocker, + "Migration disabled: failed to allocate shared memory"); } } diff --git a/include/qemu/memfd.h b/include/qemu/memfd.h index 950fb882a6..53858ed43c 100644 --- a/include/qemu/memfd.h +++ b/include/qemu/memfd.h @@ -2,6 +2,7 @@ #define QEMU_MEMFD_H #include "config-host.h" +#include <stdbool.h> #ifndef F_LINUX_SPECIFIC_BASE #define F_LINUX_SPECIFIC_BASE 1024 @@ -20,5 +21,6 @@ void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals, int *fd); void qemu_memfd_free(void *ptr, size_t size, int fd); +bool qemu_memfd_check(void); #endif /* QEMU_MEMFD_H */ diff --git a/util/memfd.c b/util/memfd.c index 4b23765b4a..7c406914c5 100644 --- a/util/memfd.c +++ b/util/memfd.c @@ -138,3 +138,25 @@ void qemu_memfd_free(void *ptr, size_t size, int fd) close(fd); } } + +enum { + MEMFD_KO, + MEMFD_OK, + MEMFD_TODO +}; + +bool qemu_memfd_check(void) +{ + static int memfd_check = MEMFD_TODO; + + if (memfd_check == MEMFD_TODO) { + int fd; + void *ptr; + + ptr = qemu_memfd_alloc("test", 4096, 0, &fd); + memfd_check = ptr ? MEMFD_OK : MEMFD_KO; + qemu_memfd_free(ptr, 4096, fd); + } + + return memfd_check == MEMFD_OK; +} |