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xen-devel
[Xen-devel] Re: [PATCH 0 of 4] mm+paravirt+xen: add pte read-modify-writ
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To: |
Zachary Amsden <zach@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 0 of 4] mm+paravirt+xen: add pte read-modify-write abstraction |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Sat, 31 May 2008 01:13:59 +0100 |
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Cc: |
xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, kvm-devel <kvm-devel@xxxxxxxxxxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Virtualization Mailing List <virtualization@xxxxxxxxxxxxxx>, Hugh Dickins <hugh@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx> |
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Fri, 30 May 2008 17:16:55 -0700 |
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Zachary Amsden wrote:
We don't fault. We write directly to the primary page tables, and clear
the pte just like native. We just issue all mprotect updates in the
queue, and flush the queue when leaving lazy mmu mode. You can't wait
for the TLB flush, you must flush the updates before releasing the
pagetable lock, or you could get misordered updates in an SMP system.
How do you track which ptes need shadow updates? Do you walk the entire
pagetable on tlb flush? Or just rebuild the shadow from scratch on demand?
J
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