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    SubjectRe: [GIT PULL] Xen APIC hooks (with io_apic_ops)

    * Jeremy Fitzhardinge <> 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.


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      Last update: 2009-05-19 14:39    [W:0.023 / U:0.512 seconds]
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