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Re: [Qemu-devel] [PATCH RFC] memory: drop _overlap variant


From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH RFC] memory: drop _overlap variant
Date: Thu, 14 Feb 2013 19:02:15 +0200

On Thu, Feb 14, 2013 at 6:50 PM, Michael S. Tsirkin <address@hidden> wrote:
>> > As you see, ioapic at 0xfec00000 overlaps pci-hole.
>> > ioapic is guest programmable in theory - should use _overlap?
>> > pci-hole is not but can overlap with ioapic.
>> > So also _overlap?
>>
>> It's a bug.  The ioapic is in the pci address space, not the system
>> address space.  And yes it's overlappable.
>
> So you want to put it where? Under pci-hole?

No, under the pci address space.  Look at the 440fx block diagram.

> And we'll have to teach all machine types
> creating pci-hole about it?

No.

>
>> >
>> > Let's imagine someone writes a guest programmable device for
>> > ARM. Now we should update all ARM devices from regular to _overlap?
>>
>> It's sufficient to update the programmable device.
>
> Then the device can be higher priority (works for apic)
> but not lower priority. Make priority signed?

Is there an actual real problem that needs fixing?



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