From: Sasha Levin <levinsasha928@gmail.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: mingo@elte.hu, gorcunov@gmail.com, asias.hejun@gmail.com,
kvm@vger.kernel.org
Subject: Re: [PATCH 2/2] kvm tools: Add ability to assert/deassert IRQs using 'kvm debug'
Date: Tue, 13 Dec 2011 07:37:29 +0200 [thread overview]
Message-ID: <1323754649.3269.13.camel@lappy> (raw)
In-Reply-To: <1323725635.1428.300.camel@jaguar>
On Mon, 2011-12-12 at 23:33 +0200, Pekka Enberg wrote:
> On Mon, 2011-12-12 at 11:19 +0200, Sasha Levin wrote:
> > Add options to assert and deassert IRQs using 'kvm debug'. For example, to
> > assert IRQ4 in guest 'my_instance':
> >
> > vm debug -n my_instance --assert_irq 4
> >
> > Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
>
> Why is this useful? How does it protect against random users asserting
> IRQs in the guest?
Mostly useful to debug hangs as it lets the user trigger an irq which
wasn't triggered the way it was supposed to be triggered.
We discussed doing this feature in when we were working on the virtio
code and had random hangs which we believed were caused by our code not
asserting IRQs the way it should be doing. This way we can do it
manually to debug such issues.
It doesn't prevent a user to shoot himself in the leg.
--
Sasha.
prev parent reply other threads:[~2011-12-13 5:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 9:19 [PATCH 1/2] kvm tools: Clean up 'kvm debug' Sasha Levin
2011-12-12 9:19 ` [PATCH 2/2] kvm tools: Add ability to assert/deassert IRQs using " Sasha Levin
2011-12-12 21:33 ` Pekka Enberg
2011-12-13 5:37 ` Sasha Levin [this message]
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