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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: | Wed, 14 Sep 2011 11:35:47 +0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20110816 Thunderbird/6.0 |
On 09/14/2011 11:27 AM, Alexander Graf wrote:
On 14.09.2011, at 10:24, Jan Kiszka wrote: > On 2011-09-14 10:22, Avi Kivity wrote: >> On 09/14/2011 11:20 AM, Jan Kiszka wrote: >>>> >>>> Anyway PCI supports the vga region at 0xa0000-0xc0000. Where is it >>>> supposed to be mapped? >>> >>> ...but not all PCI bridges make use of this feature / forward legacy >>> requests. >>> >> >> Then this should be fixed in the bridge? > > Yes, it's a PPC bug. So how does the bridge not forward it then?
I expect that currently vga adds the region to pci_address_space(). We need to create a pci_address_space_vga() function that returns a region for vga to use. Then add or remove the region to pci_address_space(), within the bridge code, depending on whether the bridge forwards vga accesses or not.
(assuming I understood the problem correctly - not sure) -- error compiling committee.c: too many arguments to function
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