From: Jamie Lokier <jamie@shareable.org>
To: Avi Kivity <avi@redhat.com>
Cc: Gerhard Wiesinger <lists@wiesinger.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Re: QEMU-KVM and video performance
Date: Wed, 21 Apr 2010 19:39:31 +0100 [thread overview]
Message-ID: <20100421183930.GL27575@shareable.org> (raw)
In-Reply-To: <4BCED82C.9020702@redhat.com>
Avi Kivity wrote:
> Writes to vga in 16-color mode don't change set a memory location to a
> value, instead they change multiple memory locations.
While code is just writing to the VGA memory, not reading(*) and not
touching the VGA I/O register that control the write latches, is it
possible in principle to swizzle the format around in memory to make
regular writes work?
(*) Reading should be ok for some settings of the write latches, I
think.
I wonder if guests of interest behave like that.
> >Is this a case where TCG would run significantly faster for code blocks
> >that have been detected to access the VGA memory?
>
> Yes.
$ date
Wed Apr 21 19:37:38 2015
$ modprobe ktcg
;-)
-- Jamie
next prev parent reply other threads:[~2010-04-21 18:39 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-19 19:14 QEMU-KVM and video performance Gerhard Wiesinger
2010-04-21 8:59 ` Avi Kivity
2010-04-21 10:08 ` [Qemu-devel] " Jamie Lokier
2010-04-21 10:49 ` Avi Kivity
2010-04-21 18:14 ` Gerhard Wiesinger
2010-04-21 20:49 ` [Qemu-devel] " Avi Kivity
2010-04-22 5:37 ` Gerhard Wiesinger
2010-04-22 6:57 ` Avi Kivity
2010-04-21 18:39 ` Jamie Lokier [this message]
2010-04-21 20:51 ` Avi Kivity
2010-04-21 21:19 ` Jamie Lokier
2010-04-22 5:44 ` Gerhard Wiesinger
2010-05-12 10:34 ` Jamie Lokier
2010-04-21 18:09 ` Gerhard Wiesinger
2010-04-21 18:33 ` Jamie Lokier
2010-04-21 18:50 ` Gerhard Wiesinger
2010-04-21 18:53 ` Jamie Lokier
2010-04-21 19:08 ` Gerhard Wiesinger
2010-04-21 21:30 ` Jamie Lokier
2010-04-22 6:12 ` Gerhard Wiesinger
2010-05-12 10:23 ` Jamie Lokier
2010-04-21 20:56 ` Avi Kivity
2010-04-22 6:04 ` Gerhard Wiesinger
2010-04-22 7:03 ` Avi Kivity
2010-05-09 19:35 ` Gerhard Wiesinger
2010-05-10 7:32 ` Avi Kivity
2010-05-12 6:14 ` Gerhard Wiesinger
2010-05-12 6:39 ` [Qemu-devel] " Avi Kivity
2011-02-18 7:32 ` [Qemu-devel] Re: QEMU-KVM and video performance - Update Gerhard Wiesinger
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