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Diffstat (limited to 'hw/virtio/vhost-backend.c')
| -rw-r--r-- | hw/virtio/vhost-backend.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c index 72d1392..910d8e0 100644 --- a/hw/virtio/vhost-backend.c +++ b/hw/virtio/vhost-backend.c @@ -11,6 +11,7 @@ #include "hw/virtio/vhost.h" #include "hw/virtio/vhost-backend.h" #include "qemu/error-report.h" +#include "linux/vhost.h" #include <sys/ioctl.h> @@ -49,12 +50,30 @@ static int vhost_kernel_get_vq_index(struct vhost_dev *dev, int idx) return idx - dev->vq_index; } +static int vhost_kernel_memslots_limit(struct vhost_dev *dev) +{ + int limit = 64; + char *s; + + if (g_file_get_contents("/sys/module/vhost/parameters/max_mem_regions", + &s, NULL, NULL)) { + uint64_t val = g_ascii_strtoull(s, NULL, 10); + if (!((val == G_MAXUINT64 || !val) && errno)) { + return val; + } + error_report("ignoring invalid max_mem_regions value in vhost module:" + " %s", s); + } + return limit; +} + static const VhostOps kernel_ops = { .backend_type = VHOST_BACKEND_TYPE_KERNEL, .vhost_call = vhost_kernel_call, .vhost_backend_init = vhost_kernel_init, .vhost_backend_cleanup = vhost_kernel_cleanup, .vhost_backend_get_vq_index = vhost_kernel_get_vq_index, + .vhost_backend_memslots_limit = vhost_kernel_memslots_limit, }; int vhost_set_backend_type(struct vhost_dev *dev, VhostBackendType backend_type) |
