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List:       freebsd-virtualization
Subject:    Re: New video BIOS for bhyve
From:       Matthew Grooms <mgrooms () shrew ! net>
Date:       2019-07-19 15:54:58
Message-ID: ec533375-cfd1-b15f-c9d2-06f83c04ea1c () shrew ! net
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On 7/19/2019 10:41 AM, Henrik Gulbrandsen wrote:
> On 2019-07-19 16:43, Matthew Grooms wrote:
>>> There was already a video BIOS with dormant support for VGA, but I 
>>> could
>>> not use that, because the X11 int10 module runs a real-mode x86 
>>> emulator
>>> that aborts when it tries to enter the C code running in protected 
>>> mode.
>>
>> I wonder if this could be related to your CPU not supporting
>> unrestricted guest mode? I know it's required for some bhyve
>> functionality.
>
> No, the int10 module runs the BIOS code on a software CPU.
> Protected mode is simply not implemented.
>
I see. Well, I assume the code you reference worked without aborting at 
some point. There is a related SOC idea project mentioned here ...

https://wiki.freebsd.org/SummerOfCodeIdeas#VGA_emulation_improvements_for_bhyve 
<https://wiki.freebsd.org/SummerOfCodeIdeas>

-Matthew

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