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Re: [Qemu-devel] [PATCH] Fix non-ACPI Timer Interrupt Routing

From: Sebastian Herbszt
Subject: Re: [Qemu-devel] [PATCH] Fix non-ACPI Timer Interrupt Routing
Date: Sun, 19 Apr 2009 23:23:20 +0200

Beth Kon wrote:
This is part of a bigger change for QEMU, incorporating irq0->inti2 override for ACPI, and non-ACPI, driven by addition of the HPET. It required BIOS changes as well as QEMU changes to route irq0 to inti2 of the IOAPIC. This patch alone is not complete. I have tested the complete solution in QEMU, thus the guards.

I just tested qemu r7185 with bochs bios (without your patch) and used a Linux guest (openSUSE-11.1-NET-i586.iso). If i don't misunderstand you
this change is only needed with HPET. I have tested the following configurations
which all fail:

hpet enabled, no guest kernel parameters
hpet enabled, guest kernel with acpi=off
hpet disabled, no guest kernel parameters
hpet disabled, guest kernel with acpi=off

Since it even fails with HPET disabled, this change can't only be needed for 
HPET, can it?

Ed: Have you tried your Linux guest with HPET enabled or disabled in your 
original report / patch?

- Sebastian

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