Re: [Xen-devel] [PATCH v1 5/5] x86/msr: introduce guest_wrmsr()

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Sergey Dyasli [mailto:sergey.dyasli@xxxxxxxxxx]
> Sent: Wednesday, August 30, 2017 6:35 PM
> 
> The new function is responsible for handling WRMSR from both HVM and
> PV
> guests. Currently it handles only 2 MSRs:
> 
>     MSR_INTEL_PLATFORM_INFO
>     MSR_INTEL_MISC_FEATURES_ENABLES
> 
> It has a different behaviour compared to the old MSR handlers: if MSR
> is being handled by guest_wrmsr() then WRMSR will either succeed (if
> a guest is allowed to access it and provided a correct value based on
> its MSR policy) or produce a GP fault. A guest will never see
> a successful WRMSR of some MSR unknown to this function.
> 
> guest_wrmsr() unifies and replaces the handling code from
> vmx_msr_write_intercept() and priv_op_write_msr().
> 
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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