On 8/27/2025 7:29 AM, Vladimir Sementsov-Ogievskiy wrote:
On 17.07.25 21:39, Steve Sistare wrote:
When preserving a vhost fd using CPR, call VHOST_RESET_OWNER prior to CPR
in old QEMU. Otherwise, new QEMU will fail when it calls VHOST_SET_OWNER
during vhost_dev_init.
But, is there a benefit in passing vhostnet fd to target QEMU? As I understand,
we anyway need a full renitialization of vhost device, as it's just reset
on RESET_OWNER. So, is passing this fd better then reopen /dev/vhost-net
on target?
Some orchestraters pass pre-opened tap and vhost fd's on the qemu command line
when initially starting qemu. For that model, preserving the open fd's in new
QEMU is the most natural solution.
- Steve
