|
xen-devel
RE: [Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself
|
To: |
"Li, Xin" <xin.li@xxxxxxxxx>, Keir Fraser <keir.xen@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: |
"Li, Xin" <xin.li@xxxxxxxxx> |
|
Date: |
Fri, 3 Jun 2011 19:54:26 +0800 |
|
Accept-language: |
zh-CN, en-US |
|
Acceptlanguage: |
zh-CN, en-US |
|
Cc: |
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|
Delivery-date: |
Fri, 03 Jun 2011 04:55:20 -0700 |
|
Envelope-to: |
www-data@xxxxxxxxxxxxxxxxxxx |
|
In-reply-to: |
<FC2FB65B4D919844ADE4BE3C2BB739AD5AB9E61A@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
|
List-help: |
<mailto:xen-devel-request@lists.xensource.com?subject=help> |
|
List-id: |
Xen developer discussion <xen-devel.lists.xensource.com> |
|
List-post: |
<mailto:xen-devel@lists.xensource.com> |
|
List-subscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
|
List-unsubscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
|
References: |
<FC2FB65B4D919844ADE4BE3C2BB739AD5AB9E58C@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <CA0DA1F8.1B89A%keir.xen@xxxxxxxxx> <FC2FB65B4D919844ADE4BE3C2BB739AD5AB9E61A@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
|
Sender: |
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
|
Thread-index: |
AcwhKSFqC1+9aLNySkqezZkJGvVaUgACElDwAApQ4SEABxMYEAAbN9Uw |
|
Thread-topic: |
[Xen-devel] [Patch] Enable SMEP CPU feature support for XEN itself |
> > 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.
Thanks!
-Xin
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
Home