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Re: [Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself
| To: | "Li, Xin" <xin.li@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, "Yang, Wei Y" <wei.y.yang@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself |
| From: | Keir Fraser <keir.xen@xxxxxxxxx> |
| Date: | Fri, 03 Jun 2011 13:34:04 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 03 Jun 2011 05:35:33 -0700 |
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| Thread-topic: | [Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself |
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On 03/06/2011 12:54, "Li, Xin" <xin.li@xxxxxxxxx> wrote: >>> The whole point of setup_clear_cpu_cap() is that it only needs to run on the >>> BP and the change gets picked up by every AP automatically as it boots. >> >> Yeah, and we can't do leaf 7.0 detect in generic_identify. Or will again set >> SMEP in >> capabilities, but it should be ok. > > I tried to not do leaf 7.0 detect on AP booting code, but system behaves > abnormally > (not hang, but "su -" never returns, after just revert the change, it runs > well). > > While at this point I want to focus on SMEP logic, we can make the > improvements, > to move such initialization to BP code only, later. Also it makes no much > sense to only > move disable_smep that way, we should move all such variables. Just get another rev of the patches out and we'll iterate if necessary. -- Keir > Thanks! > -Xin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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