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[Xen-devel] About the page lock while updating mmu.
| To: | "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] About the page lock while updating mmu. |
| From: | "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> |
| Date: | Thu, 26 Jun 2008 11:58:23 +0800 |
| Delivery-date: | Wed, 25 Jun 2008 20:59:07 -0700 |
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| Thread-index: | AcjXQOFm8DZkE/vzTR2CQF9v7JM8Ew== |
| Thread-topic: | About the page lock while updating mmu. |
Hi, Keir and Jan,
In C/S 17846, page lock is used instead of the per-domain lock. It
uses the spin lock in page_info structure to ensure the unique access
into the page. But while updating mmu (l1_entry, l2_entry, l3_entry,
l4_entry), I think these pages should be described by shadow_page_info,
but not page_info. However there is no spin lock defined in
shadow_page_info structure.
This may be the root cause for Xen bug 1278:
(On 32E, XenU guest can not boot up after destorying a HVM guest.
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1278)
Best Regards,
-- Dongxiao
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