(Not sure why the CC list has grown this huge, but I'm adding Drew for
good mesaure.)
On 05/15/13 09:27, Hu Tao wrote:
> On Wed, May 15, 2013 at 09:21:54AM +0200, Laszlo Ersek wrote:
>> On 04/05/13 09:17, Hu Tao wrote:
>>
>>> + Method(RDPT, 0, NotSerialized) {
>>> + Store(PEPT, Local0)
>>> + Return (Local0)
>>> + }
>>> +
>>> + Method(WRPT, 1, NotSerialized) {
>>> + Store(Arg0, PEPT)
>>> + }
>>
>> Please excuse my asking, I haven't been following this -- who's supposed
>> to call these methods? The latest guest kernel patch I managed to find
>> ([PATCH v7] kvm: notify host when the guest is panicked -- probably
>> obsolete by now) appears to do a direct outl().
>
> An old version calls WRPT but is buggy, so you see the outl version.
> This patch is in seabios before the outl version. If you think these
> methods are needless, feel free to send a patch.
After Drew located the guest kernel commit for me,
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=8b10acd7
I can see this SeaBIOS patch *is* necessary -- even though the RDPT /
WRPT methods are not used for port access, the port number itself is
available from ACPI (\_SB.PCI0.ISA.PEVT._CRS, identified by the
"QEMU0001" HID) to the kernel.
Hu, can you (and are you willing to) relicense this commit (seabios
commit e9725dd7) under the 2-clause BSDL so I can port it to OVMF?
(Actually I'm somewhat confused because the first S-o-b is from Paolo.
Since I share an employer with Paolo, getting permission from Paolo
would be either quite easy or even unnecessary. Anyway it's better to ask!)
Thanks,
Laszlo
