linux-kernel - Re: [PATCHv2 RFC] virtio-spec: flexible configuration layout

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Date:	Wed, 09 Nov 2011 22:24:47 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Amit Shah <amit.shah@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Krishna Kumar <krkumar2@...ibm.com>,
	Pawel Moll <pawel.moll@....com>,
	Wang Sheng-Hui <shhuiw@...il.com>,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	avi@...hat.com, penberg@...nel.org
Subject: Re: [PATCHv2 RFC] virtio-spec: flexible configuration layout

On Wed, 2011-11-09 at 21:59 +0200, Michael S. Tsirkin wrote:

[snip]

> +\begin_layout Enumerate
> +Reset the device.
> + This is not required on initial start up.
> +\end_layout
> +
> +\begin_layout Enumerate
> +The ACKNOWLEDGE status bit is set: we have noticed the device.
> +\end_layout
> +
> +\begin_layout Enumerate
> +The DRIVER status bit is set: we know how to drive the device.
> +\end_layout
> +
> +\begin_layout Enumerate
> +
> +\change_inserted 1986246365 1320838089
> +PCI capability list scan, detecting virtio configuration layout using Virtio
> + Structure PCI capabilities.

Does the legacy space always gets mapped from BAR0?

If yes, It'll be a bit harder deprecating it in the future.

If not, this should actually be #1. Previous 3 bullets here were already
setting the status byte in the device config.

[snip]

> +<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
> +\begin_inset Text
> +
> +\begin_layout Plain Layout
> +
> +\change_inserted 1986246365 1320786225
> +28 bytes

This is the new virtio header min size, shouldn't it be 32? (20 + 4
(msi-x) + 4 (guest feature) + 4 (device features)).

-- 

Sasha.

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