Messages in this thread | | | Date | Tue, 19 May 2009 14:35:48 +0200 | From | Ingo Molnar <> | Subject | Re: [GIT PULL] Xen APIC hooks (with io_apic_ops) |
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* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> Hi Ingo, > > Here's a revised set of the Xen APIC changes which adds > io_apic_ops to allow Xen to intercept IO APIC access operations.
In a previous discussion you said:
> IO APIC operations are not even slightly performance critical? Are > they ever used on the interrupt delivery path?
Since they are not performance critical, then why doesnt Xen catch the IO-APIC accesses, and virtualizes the device?
If you want to hook into the IO-APIC code at such a low level, why dont you hook into the _hardware_ API - i.e. catch those setup/routing modifications to the IO-APIC space. No Linux changes are needed in that case.
Ingo
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