RE: [Xen-devel] [PATCH][HVM] Reserve MMIO a0000-c0000 in ACPI dsdt

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

 >
>> This patch reserves MMIO 0xa0000 to 0xc0000 in ACPI dsdt, it avoids
>> possible vga driver loading problem in HVM Windows guest.
>> Also fixes a Makefile bug in hvmloader directory.
>
>Is this *actually* a problem? I didn't think BIOS tables had to report
>0xA0000-0xBFFFF as special. Certainly e820 and EFI reporting mechanisms
>should ignore it as the hole is a well-defined part of the PC 
>memory layout.
>Also OSes don't treat or probe for standard vga as a pci device.
>

without this fix, 32bit Vista boots ok, but 64bit Vista can not load vga
driver.
-Xin

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