From: john cooper <john.cooper@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: john.cooper@redhat.com, Rusty Russell <rusty@rustcorp.com.au>,
"Michael S. Tsirkin" <mst@redhat.com>,
qemu-devel@nongnu.org, jens.axboe@oracle.com
Subject: Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default
Date: Tue, 22 Sep 2009 11:09:00 -0400 [thread overview]
Message-ID: <4AB8E88C.4040103@redhat.com> (raw)
In-Reply-To: <4AB8DECA.3090908@redhat.com>
Avi Kivity wrote:
> On 09/22/2009 05:21 PM, john cooper wrote:
>>> Can we just read this page as a virtqueue command instead of having it
>>> mapped permanently?
>>>
>> Probably although I hadn't looked specifically
>> at doing so. Mapping the data via an unused
>> pci bar is pretty trivial and seemed minimally
>> intrusive to the existing driver.
>>
>
> We'll run out of bars if we expend them like that.
Agreed. However my motivation here was to use a
single additional bar specifically to compensate
for the PCI spec imposed 256 byte size limitation
of the config space mapping. As we're defining the
content/size of this area, future use to accommodate
additional data should be unrestricted.
If using an additional bar is still a concern I
can certainly have a look at accomplishing the
same via virtqueue scaffolding.
-john
--
john.cooper@redhat.com
next prev parent reply other threads:[~2009-09-22 15:13 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-07 18:14 [Qemu-devel] [PATCH] qemu: make virtio-blk PCI compliant by default Michael S. Tsirkin
2009-09-08 7:40 ` [Qemu-devel] " john cooper
2009-09-08 7:58 ` Michael S. Tsirkin
2009-09-21 11:09 ` Rusty Russell
2009-09-21 15:47 ` john cooper
2009-09-22 9:30 ` Avi Kivity
2009-09-22 14:21 ` john cooper
2009-09-22 14:27 ` Avi Kivity
2009-09-22 14:41 ` Michael S. Tsirkin
2009-09-22 14:45 ` Avi Kivity
2009-09-22 15:09 ` john cooper [this message]
2009-09-23 1:59 ` Anthony Liguori
2009-09-23 4:56 ` john cooper
2009-09-29 6:09 ` [Qemu-devel] [PATCH 0/2] fix virtio_blk serial pci config breakage john cooper
2009-09-29 6:58 ` [Qemu-devel] " Michael S. Tsirkin
2009-09-29 7:22 ` Avi Kivity
2009-09-29 8:54 ` Michael S. Tsirkin
2009-09-29 9:16 ` Avi Kivity
2009-09-29 13:55 ` Anthony Liguori
2009-09-29 14:06 ` Michael S. Tsirkin
2009-09-29 14:14 ` Anthony Liguori
2009-09-29 16:24 ` Avi Kivity
2009-09-29 16:30 ` Michael S. Tsirkin
2009-09-29 17:26 ` Anthony Liguori
2009-09-29 17:31 ` Michael S. Tsirkin
2009-09-29 17:28 ` Rusty Russell
2009-09-29 17:31 ` Anthony Liguori
2009-09-30 1:12 ` Rusty Russell
2009-09-30 1:22 ` Jamie Lokier
2009-10-05 15:44 ` john cooper
2009-09-29 18:44 ` john cooper
2009-09-29 20:55 ` Anthony Liguori
2009-09-30 1:19 ` Rusty Russell
2009-09-30 2:17 ` Anthony Liguori
2009-09-30 12:00 ` Rusty Russell
2009-09-30 18:04 ` Jamie Lokier
2009-10-05 15:41 ` john cooper
2009-09-30 11:47 ` Paul Brook
2009-10-05 15:40 ` john cooper
2009-09-29 13:51 ` Anthony Liguori
2009-09-29 16:22 ` Avi Kivity
2009-09-29 17:24 ` Anthony Liguori
2009-09-29 6:09 ` [Qemu-devel] [PATCH 1/2] " john cooper
2009-09-29 9:01 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-05 15:47 ` [Qemu-devel] [PATCH] fix virtio_blk serial pci config breakage, v2 john cooper
2009-10-05 19:54 ` [Qemu-devel] " Michael S. Tsirkin
2009-10-07 5:49 ` john cooper
2009-10-07 13:48 ` Anthony Liguori
2009-10-07 13:52 ` Michael S. Tsirkin
2009-10-07 13:55 ` Anthony Liguori
2009-10-07 15:38 ` john cooper
2009-10-05 20:15 ` Michael S. Tsirkin
2009-10-06 14:23 ` Anthony Liguori
2009-09-29 6:10 ` [Qemu-devel] [PATCH 2/2] fix virtio_blk serial pci config breakage john cooper
2009-09-29 6:57 ` [Qemu-devel] " Michael S. Tsirkin
2009-09-29 17:14 ` Rusty Russell
2009-09-14 11:39 ` [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default Michael S. Tsirkin
2009-09-15 7:29 ` john cooper
2009-09-22 5:06 ` Rusty Russell
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