Re: [Xen-devel] nested VMX issues/questions

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Jan Beulich wrote on 2014-10-14:
> Hi,
> 
> first I noticed that nvmx_vcpu_initialise() doesn't set the two MSR
> bitmap related flags, but nvmx_handle_vmwrite() apparently expects them to be 
> set.
> Is that correct (and if so, why)?

What flags do you mean?

> 
> Furthermore I question whether the handling of partial writes (for
> 32-bit L1
> guests) in nvmx_handle_vmwrite() is really correct: After only one
> half of the register got written, the _map_{io,msr}_bitmap() functions
> are not impossible to fail, causing the guest VMWRITE to get failed
> with VMFAIL_VALID (which, if coded like Xen, would cause such a guest to 
> crash).

yes, the right place to do the check should in virtual vmentry not vmwrite.

> 
> Jan


Best regards,
Yang



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