Re: [Xen-devel] [PATCH v2 8/8] x86/vvmx: fix I/O and MSR bitmaps mapping

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

> From: Sergey Dyasli [mailto:sergey.dyasli@xxxxxxxxxx]
> Sent: Tuesday, November 6, 2018 8:08 PM
> 
> Currently Xen tries to map bitmaps during emulation of vmptrld and
> vmwrite. This is wrong: a guest can store arbitrary values in those
> fields.
> 
> Make bitmaps mapping happen only during a nested vmentry and only if
> the appropriate execution controls are turned on by L1 hypervisor.
> 
> For performance reasons, Xen maps bitmaps only:
> 
>     1. During the first nested vmentry
>     2. After L1 has changed an appropriate vmcs field
>     3. After nvmx_purge_vvmcs() was previously called
> 
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>

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

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