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[Xen-devel] [PATCH 2/3 v2] XSAVE/XRSTOR: fix frozen states
| To: | Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH 2/3 v2] XSAVE/XRSTOR: fix frozen states |
| From: | "Han, Weidong" <weidong.han@xxxxxxxxx> |
| Date: | Tue, 31 Aug 2010 22:52:49 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Tue, 31 Aug 2010 07:56:30 -0700 |
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| Thread-index: | ActJHC378KxYOLFDRG+nzURdF0EQFA== |
| Thread-topic: | [Xen-devel] [PATCH 2/3 v2] XSAVE/XRSTOR: fix frozen states |
If a guest sets a state and dirties the state, but later temporarily clears the state, and at this time if this vcpu is scheduled out, then other vcpus may corrupt the state before the vcpu is scheduled in again, thus the state cannot be restored correctly. To solve this issue, this patch save/restore all states unconditionally on vcpu context switch. Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
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