Re: [PATCH] interrupt preemption support

Avi Kivity
2007-03-19T14:21:27Z

Gregory Haskins wrote:
>> Note that as long as the apic code is in userspace, the sending side is
>> also in userspace, so all the IPI related stuff doesn't touch the kernel.
>>
>
>
> I see. So really the entire approach I took (against the kernel code) is wrong, and I should focus on the QEMU side?
>

Well, eventually we do want to have the apic in the kernel, and we do
want inexpensive inter-vcpu (and driver->vcpu) interrupts. But it seems
that the simplest way to get things going is in qemu.

Note that it's not enough; there's the mmu to harden for smp and basic
support for creating > 1 vcpus.

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