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Date: Tue, 17 Sep 2013 14:32:54 +0200
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Subject: Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg
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To: Andriy Gapon <avg@FreeBSD.org>
Cc: qemu-devel@nongnu.org

Hi,

Am 17.09.2013 13:37, schrieb Andriy Gapon:
>=20
> It seems that when qemu is run with accel=3Dkvm:tcg then -d in_asm does=
 not
> produce anything.  At least, with the qemu and kvm that I have access t=
o.

Are you saying that with accel=3Dkvm:tcg when falling back to TCG, -d
in_asm does not work?

For accel=3Dkvm it's expected not to produce any output since QEMU does
not process any Translation Blocks then.

> Is there any way to obtain equivalent logging in such a configuration?
> A note: a host and a guest are both amd64 (x86_64).

Under Linux, trace options for the kvm kernel module can be enabled via
the file system.

Regards,
Andreas

>=20
> Some background.  I am trying to debug a problem with booting a FreeBSD=
 VM.  If
> acceleration is not used then the VM boots just fine.  But with acceler=
ation the
> boot process hangs somewhere in FreeBSD boot loader, judging from what =
I see on
> a screen.
> I suspect that there could be a problem with jumping from real to prote=
cted mode
> or some such "exotic" environment.  To narrow down the possibilities I =
would
> like to examine execution trace and see where execution goes into the w=
eeds.
>=20
> Thank you very much in advance.
>=20


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