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Date: Mon, 13 Oct 2014 17:22:39 +1030 From: Rusty Russell <rusty@...tcorp.com.au> To: "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org Cc: virtualization@...ts.linux-foundation.org, linux-scsi@...r.kernel.org, linux-s390@...r.kernel.org, v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org, kvm@...r.kernel.org, Amit Shah <amit.shah@...hat.com>, Cornelia Huck <cornelia.huck@...ibm.com>, Christian Borntraeger <borntraeger@...ibm.com>, "David S. Miller" <davem@...emloft.net>, Paolo Bonzini <pbonzini@...hat.com> Subject: Re: [PATCH v3 10/25] virtio: add API to enable VQs early "Michael S. Tsirkin" <mst@...hat.com> writes: > virtio spec 0.9.X requires DRIVER_OK to be set before > VQs are used, but some drivers use VQs before probe > function returns. > Since DRIVER_OK is set after probe, this violates the spec. > > Even though under virtio 1.0 transitional devices support this > behaviour, we want to make it possible for those early callers to become > spec compliant and eventually support non-transitional devices. > > Add API for drivers to call before using VQs. > > Sets DRIVER_OK internally. > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com> > Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com> OK, this all looks good, but I think we should do two things: 1) rename virtio_enable_vqs_early() to virtio_device_ready(). 2) Add a BUG_ON in the virtio_ring code to make sure device is ready before any ops are called. Cheers, Rusty. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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