Re: [Xen-devel] Intentional EPT Misconfigurations in xen

2016-12-02 Thread Jan Beulich
>>> On 02.12.16 at 03:12, wrote: > Thanks a lot. I find that if guest writes or reads MSR related to > MTRR which will cause vm exit, xen will just calculate mtrr type and store > it without setting the EPT. Why doesn't xen set the memory type (ie,emt > filed)in entry of EPT when handling vm exit

Re: [Xen-devel] Intentional EPT Misconfigurations in xen

2016-12-01 Thread 唐伟文
Hi, Thanks a lot. I find that if guest writes or reads MSR related to MTRR which will cause vm exit, xen will just calculate mtrr type and store it without setting the EPT. Why doesn't xen set the memory type (ie,emt filed)in entry of EPT when handling vm exit resulting from writing/reading MSR re

Re: [Xen-devel] Intentional EPT Misconfigurations in xen

2016-11-28 Thread Andrew Cooper
On 28/11/16 08:44, 唐伟文 wrote: > Hi, > > I have a question that why dose xen hypervisor set entry of ept as > invalid (misconfigured) deliberately which will cause VM exit > resulting from EPT > Misconfigurations. > http://xenbits.xenproject.org/gitweb/?p=xen.git;a=commit;h=aa9114edd97b292cd89b3616

[Xen-devel] Intentional EPT Misconfigurations in xen

2016-11-28 Thread 唐伟文
Hi, I have a question that why dose xen hypervisor set entry of ept as invalid (misconfigured) deliberately which will cause VM exit resulting from EPT Misconfigurations. http://xenbits.xenproject.org/gitweb/?p=xen.git;a=commit;h=aa9114edd97b292cd89b3616e3f2089471fd2201 I find the answer in this w