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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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