From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, KVM <kvm@vger.kernel.org>,
Gleb Natapov <gleb@redhat.com>,
RT <linux-rt-users@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] KVM: x86: Kick VCPU outside PIC lock again
Date: Wed, 24 Feb 2010 12:27:59 +0200 [thread overview]
Message-ID: <4B84FF2F.5040705@redhat.com> (raw)
In-Reply-To: <4B84FDF5.5080106@siemens.com>
On 02/24/2010 12:22 PM, Jan Kiszka wrote:
> Avi Kivity wrote:
>
>> On 02/24/2010 12:13 PM, Jan Kiszka wrote:
>>
>>>
>>>
>>>> I see. Won't we hit the same issue when we call pic functions from
>>>> atomic context during the guest entry sequence?
>>>>
>>>>
>>>>
>>> If there are such call paths, for sure. What concrete path(s) do you
>>> have in mind?
>>>
>>>
>>>
>> vcpu_enter_guest() -> inject_pending_event() ->
>> kvm_cpu_{has,get}_interrupt() -> various pic functions if you're unlucky.
>>
> But do they kick anyone or just check/pull information?
Probably not, kicking should be a side effect (or rather the main
effect) of queueing an interrupt, not dequeuing it.
> Never saw any
> warnings during my tests last year (granted: with older -rt and kvm
> versions).
>
Well, most guests kill the pic early on. Will apply the patch.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-02-24 10:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100217135901.331576359@linutronix.de>
2010-02-23 19:18 ` [patch] x86: kvm: Convert i8254/i8259 locks to raw_spinlocks Jan Kiszka
2010-02-23 22:23 ` Thomas Gleixner
2010-02-24 9:41 ` [PATCH] KVM: x86: Kick VCPU outside PIC lock again Jan Kiszka
2010-02-24 9:48 ` Avi Kivity
2010-02-24 9:54 ` Jan Kiszka
2010-02-24 10:04 ` Avi Kivity
2010-02-24 10:13 ` Jan Kiszka
2010-02-24 10:17 ` Avi Kivity
2010-02-24 10:22 ` Jan Kiszka
2010-02-24 10:27 ` Avi Kivity [this message]
2010-02-24 10:31 ` Jan Kiszka
2010-02-24 10:28 ` Jan Kiszka
2010-02-24 10:41 ` Avi Kivity
2010-02-24 11:42 ` Jan Kiszka
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