Re: [Xen-devel] [PATCH 1/2] VMX: correct feature checks for MPX and XSAVES

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

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Friday, September 02, 2016 6:21 PM
> 
> Their VMCS fields aren't tied to the respective base CPU feature flags
> but instead to VMX specific ones.
> 
> Note that while the VMCS GUEST_BNDCFGS field exists if either of the
> two respective features is available, MPX continues to get exposed to
> guests only with both features present.
> 
> Also add the so far missing handling of
> - GUEST_BNDCFGS in construct_vmcs()
> - MSR_IA32_BNDCFGS in vmx_msr_{read,write}_intercept()
> and mirror the extra correctness checks during MSR write to
> vmx_load_msr().
> 
> Reported-by: "Rockosov, Dmitry" <dmitry.rockosov@xxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Tested-by: "Rockosov, Dmitry" <dmitry.rockosov@xxxxxxxxx>
> 

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

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