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Re: [Xen-devel] [XTF PATCH 14/16] vvmx: test vmxon in VMX root w/ CPL = 3 and w/o current VMCS



On 12/19/16 16:07 +0000, Andrew Cooper wrote:
On 19/12/16 03:46, Haozhong Zhang wrote:
However, I am not sure of its purpose.  Why cant you reuse the previous
host state area?


Intel SDM says SW should not access or modify the VXMON rgion of a
logical processor between vmxon and vmxoff. Though I have tested on
                                                             ^
     I missed a 'not' here, hope you didn't misunderstand what I meant here


real hardware whether reusing VMXON region would cause any trouble, I
still want to exclude that possibility/noise from this test.

That is a good reason.  Could you please add a comment to this effect?


Sure, I'll add a comment around vmxon_region_2nd.

Haozhong

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