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virtio: assert and ERRLOG for virtio-user dynamic mem allocations

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We do not support dynamic memory allocation with the virtio-user
library - it results in SET_MEM_TABLE vhost messages for every
change which is not supported by the vhost target.

Add '-s 256' to vhost fuzz script, to ensure it does not
violate the new restriction.

This is a follow-on patch for issue #2596.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: If851f53d7d670ac8443f0d9c8f4e3cbe82e0df7c
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/14249
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Dong Yi <yidong0635@126.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
This commit is contained in:
Jim Harris 2022-08-29 19:59:31 +00:00 committed by Tomasz Zawadzki
parent 9ffb0497c1
commit f869197b76
3 changed files with 25 additions and 1 deletions
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10
CHANGELOG.md
View File

@ -85,6 +85,16 @@ AEN.
Added new functions: `spdk_hexlify` and `spdk_unhexlify`.
### virtio
virtio-vhost-user no longer tries to support dynamic memory allocation. The vhost target does
not support the high rate of SET_MEM_TABLE vhost messages that result from dynamic memory
allocation, so a virtio-vhost-user device will now present an ERRLOG, assert, and skip the
SET_MEM_TABLE vhost message if a memory notification is received outside of the normal device
start/stop. Applications using the virtio library in vhost-user mode should now pre-allocate
the application's memory using the -s/--mem-size option and use single shared memory file
segments using the -g/--single-file-segments option.
## v22.05
### sock

14
lib/virtio/virtio_vhost_user.c
View File

@ -29,6 +29,7 @@ struct virtio_user_dev {
uint32_t queue_size;
uint8_t status;
bool is_stopping;
char path[PATH_MAX];
uint64_t protocol_features;
struct vring vrings[SPDK_VIRTIO_MAX_VIRTQUEUES];
@ -586,6 +587,18 @@ virtio_user_map_notify(void *cb_ctx, struct spdk_mem_map *map,
uint64_t features;
int ret;
/* We do not support dynamic memory allocation with virtio-user. If this is the
* initial notification when the device is started, dev->mem_map will be NULL. If
* this is the final notification when the device is stopped, dev->is_stopping will
* be true. All other cases are unsupported.
*/
if (dev->mem_map != NULL && !dev->is_stopping) {
assert(false);
SPDK_ERRLOG("Memory map change with active virtio_user_devs not allowed.\n");
SPDK_ERRLOG("Pre-allocate memory for application using -s (mem_size) option.\n");
return -1;
}
/* We have to resend all mappings anyway, so don't bother with any
* page tracking.
*/
@ -626,6 +639,7 @@ virtio_user_unregister_mem(struct virtio_dev *vdev)
{
struct virtio_user_dev *dev = vdev->ctx;
dev->is_stopping = true;
spdk_mem_map_free(&dev->mem_map);
}

2
test/vhost/fuzz/fuzz.sh
View File

@ -7,7 +7,7 @@ source "$rootdir/scripts/common.sh"
VHOST_APP+=(-p 0)
FUZZ_RPC_SOCK="/var/tmp/spdk_fuzz.sock"
VHOST_FUZZ_APP+=(-r "$FUZZ_RPC_SOCK" -g --wait-for-rpc)
VHOST_FUZZ_APP+=(-r "$FUZZ_RPC_SOCK" -g -s 256 --wait-for-rpc)
vhost_rpc_py="$rootdir/scripts/rpc.py"
fuzz_generic_rpc_py="$rootdir/scripts/rpc.py -s $FUZZ_RPC_SOCK"