linux-kernel - Re: [PATCH -kvm] kvm: fix regression from rework KVM mmu

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Message-ID: <20100824131246.GB26660@amt.cnet>
Date:	Tue, 24 Aug 2010 10:12:46 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [PATCH -kvm] kvm: fix regression from rework KVM mmu_shrink()
 code

On Tue, Aug 24, 2010 at 10:31:07AM +0800, Xiaotian Feng wrote:
> Latest kvm mmu_shrink code rework makes kernel changes kvm->arch.n_used_mmu_pages/
> kvm->arch.n_max_mmu_pages at kvm_mmu_free_page/kvm_mmu_alloc_page, which is called
> by kvm_mmu_commit_zap_page. So the kvm->arch.n_used_mmu_pages or
> kvm_mmu_available_pages(vcpu->kvm) is unchanged after kvm_mmu_prepare_zap_page(),
> This caused kvm_mmu_change_mmu_pages/__kvm_mmu_free_some_pages loops forever.
> Moving kvm_mmu_commit_zap_page would make the while loop performs as normal.
> 
> Reported-by: Avi Kivity <avi@...hat.com>
> Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
> Tested-by: Avi Kivity <avi@...hat.com>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Cc: Dave Hansen <dave@...ux.vnet.ibm.com>
> Cc: Tim Pepper <lnxninja@...ux.vnet.ibm.com>
> ---
>  arch/x86/kvm/mmu.c |    7 +++----
>  1 files changed, 3 insertions(+), 4 deletions(-)

Applied, thanks.

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