Re: [Xen-devel] [PATCH qemu-traditional] ioreq: Support 32-bit default_ioport_* accesses

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Boris Ostrovsky writes ("Re: [PATCH qemu-traditional] ioreq: Support 32-bit 
default_ioport_* accesses"):
> IIUIC, the Linux/ACPICA patch makes ACPICA use correct field in ACPI's
> Generic Address Structure (section 5.2.3.2 in the 6.0 spec). Before the
> patch it used register's bit_width and now it will use access_size.
> According to the spec access_size 0 means undefined/legacy access.

I see.  (Well, sort of.)

> I just looked at what hvmloader provides and at least for FADT
> address_size is 0. And I wonder whether ACPICA uses 4-byte-access for
> these cases.

If 0 is "undefined/legacy access", shouldn't it be using the
register's bit width ?  Ie, isn't this then a bug in ACPICA ?

> So maybe instead of trying to patch qemu-trad I should see if I can make
> hvmloader provide proper access size. Let me poke at that.

If this "access size" attribute is new, things should work without it,
surely ?

Ian.

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