From: Avi Kivity <avi@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
KVM list <kvm@vger.kernel.org>, Huang Ying <ying.huang@intel.com>
Subject: Re: [PATCH 3/6] KVM: MMU: introduce gfn_to_page_atomic() and gfn_to_pfn_atomic()
Date: Wed, 16 Jun 2010 12:40:48 +0300 [thread overview]
Message-ID: <4C189C20.2070804@redhat.com> (raw)
In-Reply-To: <20100616084900.GB17599@basil.fritz.box>
On 06/16/2010 11:49 AM, Andi Kleen wrote:
>> The page is fine, the page tables are not. Another task can munmap() the
>> thing while is_hwpoison_address() is running.
>>
> Ok that boils down to me not seeing that source.
>
> If it accesses the page tables yes then it's racy. But whoever
> looked up the page tables in the first place should have
> returned an -EFAULT. There's no useful address attached
> to poison.
>
We need to distinguish between genuine -EFAULT and poisoned address.
That's why I suggested get_user_pages_ptes_fast. You can return page =
NULL (-EFAULT) and the pte in the same go. No race, and useful for
other cases.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-06-16 9:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4C16E6ED.7020009@cn.fujitsu.com>
2010-06-15 2:46 ` [PATCH 1/6] KVM: MMU: fix gfn got in kvm_mmu_page_get_gfn() Xiao Guangrong
[not found] ` <4C16E75F.6020003@cn.fujitsu.com>
2010-06-15 2:46 ` [PATCH 2/6] KVM: MMU: fix conflict access permissions in direct sp Xiao Guangrong
[not found] ` <4C16E7AD.1060101@cn.fujitsu.com>
2010-06-15 2:46 ` [PATCH 3/6] KVM: MMU: introduce gfn_to_page_atomic() and gfn_to_pfn_atomic() Xiao Guangrong
2010-06-15 11:22 ` Avi Kivity
2010-06-16 7:59 ` Andi Kleen
2010-06-16 8:05 ` Avi Kivity
2010-06-16 8:49 ` Andi Kleen
2010-06-16 9:40 ` Avi Kivity [this message]
2010-06-16 10:51 ` huang ying
2010-06-16 11:08 ` Avi Kivity
2010-06-17 6:46 ` Xiao Guangrong
[not found] ` <4C16E7F4.5060801@cn.fujitsu.com>
2010-06-15 2:46 ` [PATCH 4/6] KVM: MMU: introduce mmu_topup_memory_cache_atomic() Xiao Guangrong
[not found] ` <4C16E82E.5010306@cn.fujitsu.com>
2010-06-15 2:47 ` [PATCH 5/6] KVM: MMU: prefetch ptes when intercepted guest #PF Xiao Guangrong
2010-06-15 11:41 ` Avi Kivity
2010-06-17 7:25 ` Xiao Guangrong
2010-06-17 8:07 ` Avi Kivity
2010-06-17 9:04 ` Xiao Guangrong
2010-06-17 9:20 ` Avi Kivity
2010-06-17 9:29 ` Xiao Guangrong
2010-06-16 3:55 ` Marcelo Tosatti
[not found] ` <4C16E867.8040606@cn.fujitsu.com>
2010-06-15 2:47 ` [PATCH 6/6] KVM: MMU: trace pte prefetch Xiao Guangrong
2010-06-15 12:09 ` Avi Kivity
2010-06-17 7:27 ` Xiao Guangrong
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