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Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging
From: |
Alexander Graf |
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 22:14:24 +0200 |
On 14.09.2011, at 22:06, Blue Swirl wrote:
> On Wed, Sep 14, 2011 at 8:35 AM, Avi Kivity <address@hidden> wrote:
>> 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.
>
> Similar treatment should be also needed for VGA IO ports 0x3b0 etc.
>
>> (assuming I understood the problem correctly - not sure)
>
> I think you did.
Well I don't completely, so would anybody who feels reasonably savvy in messing
with the new memory api like to step up and implement this? :)
Alex
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, (continued)
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Alexander Graf, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Jan Kiszka, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Avi Kivity, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Jan Kiszka, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Avi Kivity, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Jan Kiszka, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Alexander Graf, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Jan Kiszka, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Avi Kivity, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Blue Swirl, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode,
Alexander Graf <=
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Avi Kivity, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Alexander Graf, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Richard Henderson, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Andreas Färber, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Alexander Graf, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Benjamin Herrenschmidt, 2011/09/14
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Avi Kivity, 2011/09/15
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Alexander Graf, 2011/09/15
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Benjamin Herrenschmidt, 2011/09/15
- Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode, Avi Kivity, 2011/09/15