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xen-devel
[Xen-devel] Re: One (possible) x86 get_user_pages bug
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: One (possible) x86 get_user_pages bug |
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From: |
Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> |
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Date: |
Thu, 27 Jan 2011 20:27:56 +0100 |
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Cc: |
Kaushik Barde <kbarde@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kenneth Lee <liguozhu@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Jan Beulich <JBeulich@xxxxxxxxxx>, wangzhenguo@xxxxxxxxxx, Xiaowei Yang <xiaowei.yang@xxxxxxxxxx>, linqaingmin <linqiangmin@xxxxxxxxxx>, fanhenglong@xxxxxxxxxx, Avi, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Kivity <avi@xxxxxxxxxx> |
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Delivery-date: |
Thu, 27 Jan 2011 19:07:16 -0800 |
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On Thu, 2011-01-27 at 10:27 -0800, Jeremy Fitzhardinge wrote:
>
> So is there some way we can preserve the current scheme's benefits while
> making it a bit more general? (If anyone else has non-IPI-based
> shootdown, it would be s390; is there some inspiration there? An
> instruction perhaps?)
Well, you can provide a xen gupf implementation based on rcu freed
page-tables like powerpc, sparc and s390 have.
But you'll have to change the mmu_gather implementation of xen and use
the get_page_unless_zero() thing mentioned before (or use
page_cache_get_speculative()).
But I see no need to change the x86 implementation, if the architecture
ever changes the way it does tlb invalidation we need to change more
than just the gupf implementation.
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