Messages in this thread | | | Subject | Re: [PATCH 3/14] kexec: apic-virtwire-on-shutdown.i386.patch | From | (Eric W. Biederman) | Date | 30 Aug 2004 12:02:50 -0600 |
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"Maciej W. Rozycki" <macro@linux-mips.org> writes:
> On Thu, 25 Aug 2004, Eric W. Biederman wrote: > > > I don't think the configuration you are worrying about where > > both the ioapic and the local apic can both be put into virtual > > wire mode is valid according to the mp specification. Although that > > is probably a grey area in the specification. > > The spec doesn't preclude a configuration where the master i8259A is > wired both to an I/O APIC input and to local APIC inputs. If this is the > case, it's a sole discretion of the system manufacturer to choose which > route for the "virtual wire" is used. > > I don't insist on doing exact LVT restoration as at this stage it > shouldn't really matter and the firmware should reinitialize the APIC > subsystem completely anyway. I just wanted to be sure you are aware of > the issue.
Thanks. I will keep it in mind.
Actually now that I think about it I believe recent Intel chipsets Tumwater/Lindenhurst work both ways but they have a bug that can be triggered unless you are using the IOAPIC in virtual wire mode.
In practice I still don't think it matters as everything across the hub interface and PCI-e is message based and I don't think 2 messages are generated. Still I will give it some thought.
Eric
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