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Date: Sat, 09 Oct 2010 16:44:06 +0200
From: Jan Kiszka <jan.kiszka@web.de>
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Subject: [Qemu-devel] Re: [Bug 657329] [NEW] APIC unusable on QEMU
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To: Bug 657329 <657329@bugs.launchpad.net>
Cc: qemu-devel@nongnu.org

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Am 09.10.2010 15:51, Geoffrey Lee wrote:
> Public bug reported:
>=20
> The APIC is unusable with QEMU using x86-64 system emulation.  Problem
> exists in the latest stable QEMU 0.12.5 as well as the latest git head.=

> I am using Mac OS X 10.6, 64-bit version of QEMU.
>=20
> The QEMU binary was configured with:
>=20
>  ./configure --target-list=3Di386-softmmu,x86_64-softmmubck-i-search:
> conf_
>=20
> Problem is that the hw/apic.c file (as well as a few other naughty
> files) rely on the cpu_single_env global - which is set to NULL in cpu-=

> exec.c.
>=20
> Below is a test reading the local APIC version register:
>=20
> Before taking it out:
>=20
> (qemu) xp 0xfee00030
> 00000000fee00030: 0x00000000
> (qemu)
>=20
> After:
>=20
> (qemu) xp 0xfee00030
> 00000000fee00030: 0x00050011
> (qemu)

Well, the APIC is very well usable for the VCPUs (which run with proper
cpu_single_env set. It is just out of reach for your debugging attempt.
We are working (granted: not actively ATM) on a proper device dump
interface that will allow to inspect the current APIC state as well.

BTW, your "fix" won't work if you enable io-thread support.

Jan


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