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Re: [Qemu-devel] [PATCH v2 0/4] acpi: xsdt support


From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH v2 0/4] acpi: xsdt support
Date: Tue, 9 Jun 2015 11:10:18 +0200

On Tue, Jun 09, 2015 at 02:02:31AM -0400, Paolo Bonzini wrote:
> I would just patch OVMF to ignore the RSDT if there is an XSDT.
> 
> Alternatively, can you check for ACPI 2.0 support via _OSI, and load the ACPI 
> 2.0 bits via LoadTable? Hopefully XP does not BSOD if the invalid (for ACPI 
> 1.0) opcodes are in a Then block or in a separate method... Then you can use 
> just an RSDT.
> 
> Paolo

Oh I think I misunderstood what you were saying.
First I think you were thinking of _REV, not _OSI.

Second, yes, I think the non-taken branch is not evaluated
for invalid opcodes. I will test this now.



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