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Date: Fri, 2 Sep 2016 15:10:55 -0300
From: Eduardo Habkost <ehabkost@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] vl: Delay initialization of memory backends
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org, famz@redhat.com, mprivozn@redhat.com, bsd@redhat.com, qemu-stable@nongnu.org, Yang Hongyang <yanghy@cn.fujitsu.com>, Jason Wang <jasowang@redhat.com>

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?

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).

-- 
Eduardo