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Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus |
Date: |
Wed, 26 Aug 2009 18:30:54 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Lightning/1.0pre Thunderbird/3.0b2 |
On 08/26/09 18:06, Avi Kivity wrote:
On 08/26/2009 07:03 PM, Gerd Hoffmann wrote:
Now we probably need some acpi magic to tell the guest OS that there
are a few more IRQ lines?
I wanted to route the PCI IRQs to those lines (and have eight links
instead of four).
Right now we have IRQs 5,10,11 for PCI. Having one more IRQ (so we have
one for each link) would be useful IMHO. eight links + eight irqs would
be even more useful. What needs to be done for that?
BTW: Seems linux doesn't use IRQ 5 even with lots of PCI devices,
instead it makes them share 10+11 ...
Now I don't think it's worthwhile, as every guest that
is interesting from a performance point of view has MSI support.
Not all emulated devices have MSI support though ...
So I think we should just leave these lines as is, terminated with a
4.7K resistor to avoid picking up noise.
Oh, nice, didn't know kvm has virtual resistor support.
cheers,
Gerd
- [Qemu-devel] [PATCH 0/2] Disentagle ISA IRQs, Avi Kivity, 2009/08/09
- [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/09
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/10
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/26
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/26
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus,
Gerd Hoffmann <=
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gleb Natapov, 2009/08/26
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gleb Natapov, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Jamie Lokier, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gleb Natapov, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Isaku Yamahata, 2009/08/27
- [Qemu-devel] Re: [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Bjørn Mork, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Avi Kivity, 2009/08/27
- Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus, Gerd Hoffmann, 2009/08/27