Messages in this thread | | | From | (Eric W. Biederman) | Date | Tue, 30 Jun 2009 12:43:47 -0700 | Subject | Re: [PATCH v3] enable x2APIC without interrupt remapping under KVM |
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Gleb Natapov <gleb@redhat.com> writes:
> Considering that interrupt remapping is fairly new feature > are you saying that hotplug (pci and cpu) on x86 is a horrible > hack on Linux?
Just the current cpu hotplug path.
>> It is better than nothing but it certainly is not something >> I would expect to work all of the time. >> > Because of horrible code or non-complaint ioapic implementation out > there? If later this is not a big issue for KVM.
Both. And even in spec ioapics can't be made to work 100% reliably.
>> Interrupt remapping is the one case where we have hardware >> that works according to spec and that works reasonably well. >> > I am sure when there was only one ioapic implementation in existence > it worked according to a spec (and if not spec was changed :)) Give > interrupt remapping some time and than we will see how above statement > holds.
What we need for cpu hotplug/unplug is on the tested path now. That is a significant difference.
Eric
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