Re: [Qemu-devel] [RFC] qemu VGA endian swap low level drawing changes

[Paolo Bonzini <pbonzini@redhat.com>]

Il 01/07/2014 11:07, Gerd Hoffmann ha scritto:
> On Di, 2014-07-01 at 10:31 +0200, Paolo Bonzini wrote:
>> Il 01/07/2014 10:26, Alexander Graf ha scritto:
>>>>
>>>>> Right. A quick fix would be to add a flag to force always using a shadow
>>>>> surface and set it in cirrus ... I'm not sure anybody will notice the
>>>>> performance difference.
>>>> I suspect we can rip out hw cursor emulation and nobody will notice the
>>>> difference either ...
>>>
>>> Very likely ;). Though I think we're better off keeping it around to
>>> make sure we're still compatible with ancient guests (Windows 3.1 might
>>> use it too). Making it slow however shouldn't make any difference at all.
>>
>> If you tell me what to look at, I legally own a Windows 98 CD (also NT4
>> but I have to dig it out) and can test it later this week.
>
> /me has win98 too, that doesn't boot after install though.

Tried TCG?  There is a timing loop that makes Win98 fail on too-fast 
computers.

> So if you can try nt4 that would be great.  Test is simple: switch into
> 16bpp mode (that one uses shared surface in git master), check whenever
> the mouse pointer is present.
>
> Bonus points for compiling with DEBUG_CIRRUS and checking the logs to
> see whenever nt4 actually enables the hw cursor (sr registers, index
> 0x12, bit 0).

Thanks!

Paolo