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[Xen-devel] [PATCH] mem_sharing: fix race condition of nominate and unsh
| To: | Tim Deegan <Tim.Deegan@xxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] mem_sharing: fix race condition of nominate and unshare |
| From: | Jui-Hao Chiang <juihaochiang@xxxxxxxxx> |
| Date: | Fri, 7 Jan 2011 00:11:59 +0800 |
| Cc: | tinnycloud <tinnycloud@xxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 06 Jan 2011 08:12:45 -0800 |
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Hi, this patch does the following (1) When updating/checking p2m type for mem_sharing, we must hold shr_lock (2) For nominate operation, if the page is already nominated, return the handle from page_info->shr_handle (3) For unshare operation, it is possible that multiple users unshare a page via hvm_hap_nested_page_fault() at the same time. If the page is already un-shared by someone else, simply return success. NOTE: we assume that nobody holds page_alloc_lock/p2m_lock before calling nominate/share/unshare. Signed-off-by: Jui-Hao Chiang <juihaochiang@xxxxxxxxx> Signed-off-by: Han-Lin Li <Han-Lin.Li@xxxxxxxxxxx> Bests, Jui-Hao
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