Messages in this thread | | | Subject | Re: [PATCH 1/4] KVM: MMU: fix permission_fault() | From | Xiao Guangrong <> | Date | Wed, 30 Mar 2016 14:39:05 +0800 |
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On 03/30/2016 02:36 PM, Paolo Bonzini wrote: > > > On 30/03/2016 03:56, Xiao Guangrong wrote: >>> x86/access.flat is currently using the "other" definition, i.e., PFEC.PK >>> is only set if W=1 or CR0.WP=0 && PFEC.U=0 or PFEC.W=0. Can you use it >>> (with ept=1 of course) to check what the processor is doing? >> >> Sure. >> >> And ept=1 is hard to trigger MMU issue, i am enabling PKEY on shadow >> MMU, let's see what will happen. ;) > > No, don't do that! > > ept=1 lets you test what the processor does. It means you cannot test > permission_fault(), but what we want here is just reverse engineering > the microcode. ept=1 lets you do exactly that.
Yes, i got this point. Huaitong will do the test once the machine gets free.
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