Avi Kivity wrote:
On 10/08/2009 03:55 PM, Anthony Liguori wrote:
You should probably just setup VMState such that it directly saves
kvm_lapic_state and then have the pre/post functions call the kernel
ioctls to sync it. There's not a whole lot of point switching the
state between two different structures.
It ensures the two models are compatible. Since they're the same
device from the point of view of the guest, there's no reason for them
to have different representations or to be incompatible.
The problem is, the in-kernel apic is not part of the qemu source tree.
If we add a field to the qemu apic, then we would break the in-kernel
apic and vice-versa. It's far easier to just have the in-kernel apic as
a separate model.
Most importantly though, the code should reflect how things behave.
It's extremely difficult to look at the apic code and figure out what
bits are used and what bits aren't used when the in-kernel apic is enabled.
Regards,
Anthony Liguori
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