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[Qemu-devel] Re: [PATCH v2 3/9] provide in-kernel ioapic


From: Anthony Liguori
Subject: [Qemu-devel] Re: [PATCH v2 3/9] provide in-kernel ioapic
Date: Mon, 12 Oct 2009 09:49:54 -0500
User-agent: Thunderbird 2.0.0.23 (X11/20090825)

Jamie Lokier wrote:
Anthony Liguori wrote:
We already have the single device model implementation and the limitations are well known. The best way to move forward is for someone to send out patches implementing separate device models.

At that point, it becomes a discussion of two concrete pieces of code verses hand waving.

Out of curiosity now, what _are_ the behavioural differences between
the in-kernel irqchip and the qemu one?

Are the differences significant to guests, such that it might be
necessary to disable the in-kernel irqchip for some guests, or
conversely, necessary to use KVM for some guests?

No, the behavior differences are not terribly significant for the apic. Disabling it is really most useful for debugging purposes.

Regards,

Anthony Liguori





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