linux-kernel - Re: [PATCHv3 RFC] virtio-pci: flexible configuration layout

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Message-ID: <20111123084932.GF22734@redhat.com>
Date:	Wed, 23 Nov 2011 10:49:33 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	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
Subject: Re: [PATCHv3 RFC] virtio-pci: flexible configuration layout

On Wed, Nov 23, 2011 at 01:02:22PM +1030, Rusty Russell wrote:
> +/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
> +struct virtio_pci_common_cfg {
> +	/* About the whole device. */
> +	__u64 device_features;	/* read-only */
> +	__u64 guest_features;	/* read-write */

We currently require atomic accesses to common fields.
Some architectures might not have such for 64 bit,
so these need to be split I think ...

> +	__u64 queue_address;	/* read-write */
> +	__u16 msix_config;	/* read-write */
> +	__u8 device_status;	/* read-write */
> +	__u8 unused;
> +
> +	/* About a specific virtqueue. */
> +	__u16 queue_select;	/* read-write */
> +	__u16 queue_align;	/* read-write, power of 2. */
> +	__u16 queue_size;	/* read-write, power of 2. */
> +	__u16 queue_msix_vector;/* read-write */
> +};
>  #endif
> 
> 
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