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Re: [Xen-devel] [PATCH] VMX: wbinvd when vmentry under UC
- To: "Jinsong Liu" <jinsong.liu@xxxxxxxxx>, "Will Auld" <will.auld@xxxxxxxxx>
- From: "Jan Beulich" <JBeulich@xxxxxxxx>
- Date: Tue, 26 Nov 2013 09:33:36 +0000
- Cc: "tim@xxxxxxx" <tim@xxxxxxx>, "keir@xxxxxxx" <keir@xxxxxxx>, "suravee.suthikulpanit@xxxxxxx" <suravee.suthikulpanit@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Eddie Dong <eddie.dong@xxxxxxxxx>, "zhenzhong.duan@xxxxxxxxxx" <zhenzhong.duan@xxxxxxxxxx>, Donald D Dugger <donald.d.dugger@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, "sherry.hurwitz@xxxxxxx" <sherry.hurwitz@xxxxxxx>, Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
- Delivery-date: Tue, 26 Nov 2013 09:33:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
>>> On 26.11.13 at 09:56, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote:
> Another option is to trust guest. We can remove wbinvd from vmentry -- per
> SDM
> when guest sets cr0.cd it should explicitly flush cache, otherwise itself
> cannot guarantee cache coherency.
Which - once again - wouldn't account for hypervisor writes to guest
memory.
Jan
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