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[Xen-devel] [PATCH] Do not set page's count_info directly
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] Do not set page's count_info directly |
| From: | "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> |
| Date: | Thu, 5 Mar 2009 17:11:56 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
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| Delivery-date: | Thu, 05 Mar 2009 01:12:41 -0800 |
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| Thread-index: | Acmdcm6GSftyn0gkQJWVa8H8BEB+YQ== |
| Thread-topic: | [PATCH] Do not set page's count_info directly |
Page offline patch add several flag to page_info->count_info. However, currently some code will try to set count_info after alloc_domheap_pages without using "&" or "|" operation, this may cause the new flags lost, since there are no protection. This patch try to make sure all write to count_info will only impact specific field. Also currently shadow code assume count_info is 0 for shadow page, however, this is invalid after the new flags. Change some assert in shadow code. Signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx> Thanks Yunhong Jiang
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