From: Andi Kleen <andi@firstfloor.org>
To: Avi Kivity <avi@redhat.com>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
KVM list <kvm@vger.kernel.org>, Andi Kleen <andi@firstfloor.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 09:59:18 +0200 [thread overview]
Message-ID: <20100616075918.GA17599@basil.fritz.box> (raw)
In-Reply-To: <4C17625E.3020308@redhat.com>
On Tue, Jun 15, 2010 at 02:22:06PM +0300, Avi Kivity wrote:
> Too much duplication. How about putting the tail end of the function in a
> common helper (with an inatomic flag)?
>
> btw, is_hwpoison_address() is racy. While it looks up the address, some
> other task can unmap the page tables under us.
Where is is_hwpoison_address() coming from? I can't find it anywhere.
Anyways hwpoison will not remove the page as long as there
is a reference to it, so as long as you get the reference
race free against another task you're ok. Of course there might
be always an error in between and the hardware may poison
the data, but we don't try to handle all kernel errors.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2010-06-16 7:59 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 [this message]
2010-06-16 8:05 ` Avi Kivity
2010-06-16 8:49 ` Andi Kleen
2010-06-16 9:40 ` Avi Kivity
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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