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Re: [Xen-devel] [PATCH] acpi: set correct address of the control/event blocks in the FADT

On 29/08/17 14:42, Jan Beulich wrote:
>>>> On 29.08.17 at 15:24, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 29/08/17 09:50, Roger Pau Monne wrote:
>>> Commit 149c6b unmasked an issue long present in Xen: the control/event
>>> block addresses provided in the ACPI FADT table where hardcoded to the
>>> V1 version. This was papered over because hvmloader would also always
>>> set HVM_PARAM_ACPI_IOPORTS_LOCATION to 1 regardless of the BIOS
>>> version.
>>> Fix this by passing the address of the control/event blocks to
>>> acpi_build_tables, so the values can be properly set in the FADT
>>> table provided to the guest.
>>> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>> ---
>>> Cc: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
>>> Cc: Jan Beulich <jbeulich@xxxxxxxx>
>>> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
>>> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
>>> ---
>>> This commit should fix the qumu-trad Windows errors seen by osstest.
>> This changes windows behaviour, but does not fix windows.  Windows now
>> boots, but waits forever while trying to reboot after installing PV
>> drivers.  There is no hint in the qemu log that the ACPI shutdown event
>> was received.
> Sounds to me like matching exactly the question I've raised: It
> would help to understand why things have worked originally.
> While PM1a/b are generally meant to help split brain environments
> like our Xen/qemu one, iirc we don't make use of PM1b, and hence
> it seems quite likely that both Xen and qemu monitor PM1a port
> accesses. If that's the case and things have worked before, it's
> quite possible that qemu-trad is no servicing the wrong port.

That's what actually happen. It seems that modern versions of qemu-trad
service V1 port location. I was initially confused by comments in Xen
suggesting that V0 is the right choice for qemu-trad. Seems they need to
be updated or removed.

I'll prepare an updated version of the fix today. And it looks like we
don't need Roger's fix in that case.

>> Unless someone has some very quick clever ideas, the original fix will
>> need reverting.
> I agree.
> Jan

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