Re: [Qemu-stable] [Qemu-devel] [PATCH] vl: Delay initialization of memory backends

[Paolo Bonzini]

On 02/09/2016 20:10, Eduardo Habkost wrote:
> On Fri, Sep 02, 2016 at 04:56:49PM +0200, Paolo Bonzini wrote:
>> On 02/09/2016 16:04, Eduardo Habkost wrote:
> [...]
>>> Now, why exactly vhost-user-test needs accel=tcg and can't use
>>> accel=qtest?
>>
>> Because it uses iPXE to exercise the NIC.
> 
> Is it used to actually exercise the NIC, or just to initialize
> it?

Well that's one way to exercise it. :)

> Original commit says "pc-bios/pxe-virtio.rom is used to
> instantiate a virtio pcicontroller". I don't see any test code
> that receives any data from iPXE: nothing is read from log_fd,
> the VHOST_USER_SET_VRING_KICK/VHOST_USER_SET_VRING_CALL FDs are
> simply ignored. The only memory writes/reads are on the first
> memory page.
> 
> I suggest simply using libqos. If somebody really wants rx/tx
> tests using vhost-user, they can be written using libqos (just
> like virtio-net-test.c).

Ok, this makes sense.

Paolo