From: Avi Kivity <avi@redhat.com>
To: Gerhard Wiesinger <lists@wiesinger.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Re: QEMU-KVM and video performance
Date: Wed, 12 May 2010 09:39:50 +0300 [thread overview]
Message-ID: <4BEA4D36.3020608@redhat.com> (raw)
In-Reply-To: <alpine.LFD.2.00.1005120804330.26873@bbs.intern>
On 05/12/2010 09:14 AM, Gerhard Wiesinger wrote:
> On Mon, 10 May 2010, Avi Kivity wrote:
>
>> On 05/09/2010 10:35 PM, Gerhard Wiesinger wrote:
>>>>>
>>
>> For 256 color more the first priority is to find out why direct
>> mapping is not used. I'd suggest tracing the code that makes this
>> decision (in hw/*vga.c) and seeing if it's right or not.
>
> I think this is because A000 is not initialized for KVM (see log below
> and logging patch attached).
Why isn't it initialized?
Did the guest configure things such as it is impossible to map it
directly? Or does the configuration allow direct mapping and qemu
incorrectly decides that it cannot direct map?
Best would be to print out all the configuration registers and interpret
them according to the specification.
>
> vga_dirty_log_start
> vga_dirty_log_start_mapping_lfb_vram_mapped, start=0x000A0000,
> len=0x00008000
> BUG: kvm_dirty_pages_log_change: invalid parameters
> 00000000000a0000-00000000000a7fff
Why does this happen?
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2010-05-12 11:10 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-19 19:14 [Qemu-devel] QEMU-KVM and video performance Gerhard Wiesinger
2010-04-21 8:59 ` [Qemu-devel] " Avi Kivity
2010-04-21 10:08 ` Jamie Lokier
2010-04-21 10:49 ` Avi Kivity
2010-04-21 18:14 ` Gerhard Wiesinger
2010-04-21 20:49 ` Avi Kivity
2010-04-22 5:37 ` Gerhard Wiesinger
2010-04-22 6:57 ` Avi Kivity
2010-04-21 18:39 ` Jamie Lokier
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 ` Avi Kivity [this message]
2011-02-18 7:32 ` [Qemu-devel] Re: QEMU-KVM and video performance - Update Gerhard Wiesinger
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