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Re: [Qemu-devel] Re: QEMU-KVM and video performance


From: Avi Kivity
Subject: Re: [Qemu-devel] Re: QEMU-KVM and video performance
Date: Wed, 12 May 2010 09:39:50 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4

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.




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