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[Qemu-devel] Re: [PATCH 1 of 2] kvm: Move KVM mp_state accessors to i386

From: Anthony Liguori
Subject: [Qemu-devel] Re: [PATCH 1 of 2] kvm: Move KVM mp_state accessors to i386-specific code
Date: Mon, 09 Nov 2009 17:22:25 -0600
User-agent: Thunderbird (X11/20090825)

Jan Kiszka wrote:
Hollis Blanchard wrote:
Unbreaks PowerPC and S390 KVM builds.

What breaks precisely?

Note that KVM_GET/SET_MP_STATE are generic IOCTLs and supposed to be
shared with ia64 - one day. We could still move things back then, but
maybe we can handle the build issues already in place, specifically as
qemu-kvm is carrying this in generic code since ages.

mp_state is pretty specific to the in-kernel apic. ia64 may share because it shares an interrupt controller but that does not make it generic. That just makes two architectures have a common field.

I don't think there's anything wrong with kvm exposing this as a common ioctl but from a qemu perspective, it makes no sense as a common cpu field. It only makes sense when using kvm and when using an in-kernel apic. That's very architecture specific from an qemu perspective.


Anthony Liguori

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