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Re: [Qemu-devel] [PATCH] pc_sysfw: Always use alias for ISA BIOS region


From: Jordan Justen
Subject: Re: [Qemu-devel] [PATCH] pc_sysfw: Always use alias for ISA BIOS region
Date: Thu, 1 Nov 2012 11:03:17 -0700

On Thu, Nov 1, 2012 at 10:21 AM, Jan Kiszka <address@hidden> wrote:
> On 2012-11-01 18:17, Jan Kiszka wrote:
>> On 2012-11-01 18:15, Jordan Justen wrote:
>>> Would the old behavior need to be preserved for pc-1.1 & pc-1.2?
>>
>> Why? This is just restoring the older, correct behavior.
>
> Err, sorry, there was no difference to the behavior before pflash
> (unless flash was changed by the guest).
>
> Still, I see no point in preserving the current behavior even for compat
> machine. Which (sane) guest should rely on an inconsistency between the
> two BIOS mappings after an update?

I will not claim to know much about this, but I thought the purpose
was to allow qemu to properly restore old saved VMs.

I agree that the alias in an improvement in machine emulation, and I
don't think any guest software will rely upon the pc-1.1/pc-1.2
behavior.

It is probably worth verifying that the 440 chipset PAM registers are
still working after this change.

-Jordan



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