[Qemu-devel] DPDK application using vhost-user segfaults when guest is r

From:

Shesha Sreenivasamurthy

Subject:

[Qemu-devel] DPDK application using vhost-user segfaults when guest is rebooted/shutdown

Date:

Thu, 14 Jan 2016 17:05:23 -0800

If a guest has vhost-user enabled, then on reboot vhost_virtqueue_stop is invoked. This unmaps vring memory. However, it will not give any indication to the underlying DPDK application about it. Therefore, a pollmode DPDK driver tries to read the ring to check for packets and segfaults.

We do have VHOST_USER_RESET_OWNER API an can be called by vhost_virtqueue_stop so that DPDK application can note that mappings are gone. Is that the right way ?

Qemu Version: qemu-2.5.0

DPDK Version: 2.2

Thanks,

Shesha.

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