Re: [Qemu-devel] OSX guest vs. kvm ioapic polarity

[Alexander Graf]

> Am 29.01.2014 um 22:36 schrieb "Gabriel L. Somlo" <address@hidden>:
> 
> On Wed, Jan 29, 2014 at 03:17:43PM +0100, Alexander Graf wrote:
>>> Do you belive there's a chance we can work around this by just tweaking
>>> ACPI on the QEMU side, and thus eliminate the need for a KVM patch ?
>> 
>> Yes, that's what I was hoping. What does the IRQ link property look
>> like on a real Mac?
> 
> On the varous Mac models on which I pulled the DSDT, I have something
> like:
> 
>                Device (LNKA) {
>                    Name (_PRS, ResourceTemplate () {
>                        IRQ (Level, ActiveLow, Shared, )
>                            {1,3,4,5,6,7,10,12,14,15}
>                    })
> 
> So yeah, definitely "Low", not "High".
> 
> Interestingly enough, on my Dell Latitude D630, the various LNK* nodes
> also have "ActiveLow" in their _PRS methods! Same with my Dell R410
> server.
> 
>> We define PCI IRQ links as
>> 
>> 254             Name(_PRS, ResourceTemplate() { \
>> 255                 Interrupt(, Level, ActiveHigh, Shared) { \
>> 256                     5, 10, 11 \
>> 257                 } \
>> 258             }) \
>> 
>> Have you tried to change this to ActiveLow?
> 
> Yes, and I also tried adding a bunch of extra IRQ numbers, but to no
> avail. OS X will boot fine with the one-liner KVM patch removing the
> statement:
> 
>    "irq_level ^= entry.fields.polarity;"
> 
> regardless of how LNK*._PRS is configured, and will hang without the
> patch, also regardless of LNK*._PRS.

Can you check whether it configures the ioapic differently?

Alex

> 
> Thanks,
> --G