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Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging


From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode
Date: Thu, 25 Aug 2011 10:19:53 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20110816 Thunderbird/6.0

On 08/22/2011 08:12 PM, Jan Kiszka wrote:
Most VGA memory access modes require MMIO handling as they demand weird
logic to get a byte from or into the video RAM. However, there is one
exception: chain 4 mode with all memory planes enabled for writing. This
mode actually allows lineary mapping, which can then be combined with
dirty logging to accelerate KVM.

This patch accelerates specifically VBE accesses like they are used by
grub in graphical mode. Not only the standard VGA adapter benefits from
this, also vmware and spice in VGA mode.



On which version of grub does this work? This isn't having any effect on my Fedora grub.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.




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