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xen-devel
[Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just becaus
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC |
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From: |
ebiederm@xxxxxxxxxxxx (Eric W. Biederman) |
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Date: |
Fri, 12 Jun 2009 13:35:35 -0700 |
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Cc: |
Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx> |
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Fri, 12 Jun 2009 13:36:29 -0700 |
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<4A329CF8.4050502@xxxxxxxx> (Jeremy Fitzhardinge's message of "Fri\, 12 Jun 2009 11\:22\:48 -0700") |
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Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:
> Parse the ACPI MADT for I/O APIC information, even if the cpu has no
> (apparent) local APIC (ie, the CPU's APIC feature flag is clear).
>
> In principle, the local APIC and the I/O APIC are distinct (but related)
> components, which can be independently present.
>
> In practice this can happen in a Xen system, where the hypervisor has
> full control over the local APICs, and delivers interrupts initiated by
> the I/O APICs via Xen's event channel mechanism.
Xen is giving us a semi bogus acpi table?
What is the paravirt configuration model with Xen? Is it documented
somewhere?
Eric
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