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Date: Thu, 26 Feb 2015 10:36:25 +0100
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20150226093625.GA24766@redhat.com>
References: <47CEA9C0E570484FBF22EF0D7EBCE5B534A4984F@szxema505-mbs.china.huawei.com>
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Subject: Re: [Qemu-devel] [Question] about vhost user Interface
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To: "Gaohaifeng (A)" <gaohaifeng.gao@huawei.com>
Cc: "pbonzini@redhat.com" <pbonzini@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "Lilijun (Jerry)" <jerry.lilijun@huawei.com>

On Thu, Feb 26, 2015 at 09:30:40AM +0000, Gaohaifeng (A) wrote:
> Hi
>=20
>   I want to use pxe to install a guest os whose nic type is vhost user.=
 However
> pxe rom doesn=E2=80=99t support msi-x interrupt, so qemu won=E2=80=99t =
start vhost net.
>=20
> Call relationship:
>=20
> virtio_net_vhost_status-> vhost_net_query-> vhost_dev_query->
> virtio_pci_query_guest_notifiers -> msix_enabled
>=20
> =20
>=20
> In my test, I remove the msix check for vhost user interface and succes=
sfully
> install the guest os by pxe.
>=20
> Is it OK to do like this and will it cause other problems?
>=20
> =20
>=20
> Thanks.
>=20
> Haifeng Gao
>=20

I think we should fix it.
As a quick hack, you should be able to just use vhostforce.

--=20
MST