From: Anthony Liguori <anthony@codemonkey.ws>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH RFC] vga: flag vga ram for notifiers
Date: Thu, 31 Mar 2011 13:33:58 -0500 [thread overview]
Message-ID: <4D94C916.6080709@codemonkey.ws> (raw)
In-Reply-To: <20110331174328.GA25133@redhat.com>
On 03/31/2011 12:43 PM, Michael S. Tsirkin wrote:
> Currently, vga cards that allocate vga ram,
> register it as regular ram. When this happens
> a lot, vhost need to get notified and flush
> its memory tables, which is slow.
>
> This was observed with cirrus vga.
>
> As a solution, add an explicit flag when
> registering vga ram, vhost-net can simply ignore it.
>
> Long term, we might be able to use this API
> to avoid the need to request
> dirty loggin from devices explicitly.
>
> Tested: with cirrus vga only.
>
> Signed-off-by: Michael S. Tsirkin<mst@redhat.com>
Treating vga specially is not the right approach.
You want to treat real RAM specially and only make that visible to
vhost. See http://wiki.qemu.org/Features/RamAPI
There is nothing special about VGA.
Regards,
Anthony Liguori
next prev parent reply other threads:[~2011-03-31 18:34 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-31 17:43 [Qemu-devel] [PATCH RFC] vga: flag vga ram for notifiers Michael S. Tsirkin
2011-03-31 18:33 ` Anthony Liguori [this message]
2011-03-31 18:49 ` Michael S. Tsirkin
2011-03-31 19:01 ` Anthony Liguori
2011-03-31 19:07 ` Michael S. Tsirkin
2011-03-31 19:26 ` Anthony Liguori
2011-03-31 20:03 ` Michael S. Tsirkin
2011-03-31 20:21 ` Anthony Liguori
2011-03-31 19:17 ` Alex Williamson
2011-03-31 19:18 ` Peter Maydell
2011-03-31 19:29 ` Anthony Liguori
2011-03-31 20:12 ` Peter Maydell
2011-03-31 20:23 ` Anthony Liguori
2011-03-31 21:32 ` Peter Maydell
2011-03-31 21:38 ` Michael S. Tsirkin
2011-03-31 21:49 ` Anthony Liguori
2011-03-31 23:42 ` Michael S. Tsirkin
2011-04-01 0:44 ` Anthony Liguori
2011-04-01 1:07 ` Michael S. Tsirkin
2011-04-01 7:12 ` Peter Maydell
2011-04-01 11:21 ` Michael S. Tsirkin
2011-03-31 21:26 ` Michael S. Tsirkin
2011-03-31 21:32 ` Anthony Liguori
2011-03-31 21:37 ` Michael S. Tsirkin
2011-03-31 21:48 ` Anthony Liguori
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