linux-kernel - Re: [PATCH] KVM: x86: Convert tsc_write_lock to raw

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Message-ID: <4D5027A1.8000505@redhat.com>
Date:	Mon, 07 Feb 2011 19:10:57 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
CC:	Zachary Amsden <zamsden@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	kvm <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: x86: Convert tsc_write_lock to raw_spinlock

On 02/07/2011 06:59 PM, Jan Kiszka wrote:
> >
> >  (well, actually, cpufreq_notifier and kvm_arch_hardware_enable are
> >  already non preemptible, and the stats code should just go away?)
>
> The stats code is trivial to convert, so it doesn't matter.

Removal is easier.

> But what about mmu_shrink and its list_move_tail? How is this
> synchronized against kvm_destroy_vm - already today?

kvm_destroy_vm() takes kvm_lock.  If a vm is destroyed before 
mmu_shrink(), mmu_shrink() will never see it.  If we reach mmu_shrink() 
before kvm_destroy_vm(), the latter will wait until mmu_shrink() is done.

-- 
error compiling committee.c: too many arguments to function

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