From: Paolo Bonzini <pbonzini@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>,
linux-rt-users@vger.kernel.org, kvm@vger.kernel.org,
Jan Kiszka <jan.kiszka@siemens.com>
Subject: Re: [PATCH-next] kvm: don't try to take mmu_lock while holding the main raw kvm_lock
Date: Thu, 27 Jun 2013 13:54:55 +0200 [thread overview]
Message-ID: <51CC280F.9040402@redhat.com> (raw)
In-Reply-To: <20130627114302.GK18508@redhat.com>
Il 27/06/2013 13:43, Gleb Natapov ha scritto:
>>> > > I am copying Jan, the author of the patch. Commit message says:
>>> > > "Code under this lock requires non-preemptibility", but which code
>>> > > exactly is this? Is this still true?
>> >
>> > hardware_enable_nolock/hardware_disable_nolock does.
>> >
> I suspected this will be the answer and prepared another question :)
> From a glance kvm_lock is used to protect those just to avoid creating
> separate lock, so why not create raw one to protect them and change
> kvm_lock to non raw again. Admittedly I haven't looked too close into
> this yet.
I was wondering the same, but I think it's fine. There's just a handful
of uses outside virt/kvm/kvm_main.c.
Paolo
next prev parent reply other threads:[~2013-06-27 11:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-25 22:34 [PATCH-next] kvm: don't try to take mmu_lock while holding the main raw kvm_lock Paul Gortmaker
2013-06-26 8:10 ` Paolo Bonzini
2013-06-26 18:11 ` [PATCH-next v2] " Paul Gortmaker
2013-06-26 21:59 ` Paolo Bonzini
2013-06-27 2:56 ` Paul Gortmaker
2013-06-27 10:22 ` Paolo Bonzini
2013-06-27 11:09 ` [PATCH-next] " Gleb Natapov
2013-06-27 11:38 ` Paolo Bonzini
2013-06-27 11:43 ` Gleb Natapov
2013-06-27 11:54 ` Paolo Bonzini [this message]
2013-06-27 12:16 ` Jan Kiszka
2013-06-27 12:32 ` Gleb Natapov
2013-06-27 13:00 ` Paolo Bonzini
2013-06-27 13:01 ` Paolo Bonzini
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