On 05/03/2011 08:45 PM, OGAWA Hirofumi wrote:
Avi Kivity<avi@xxxxxxxxxx> writes: > On 05/03/2011 07:57 PM, OGAWA Hirofumi wrote: >> > >> > Usually yes, but we already have the PIT wired to INTIN0. I saw that >> > the kernel consults the mptable to see which pin to use, so with the >> > right BIOS magic we can get things to work. >> >> Um..., I'm confused more. If so, MADT doesn't say it. MADT says irq == 0 >> is pin == 2, this is one of reasons why linux is quite silent in >> check_timer(). And I can't see why it is working by pin == 2 for IOAPIC. >> >> If I can make time, I'll see what happens by pin == 2 and pin == 0 of >> IOAPIC in kvm. > > You're right. The default routing is INTIN0, but qemu changes it to > INTIN2 and tells kvm. > > So INTIN0 is free for the 8259A output. I see. Did it mean qemu changes the wiring, so kvm can't work for live migration with it?
qemu changes the wiring, but it does so on both the migration source and the migration target (before either is launched), so they are migration compatible.
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