Re: [Xen-devel] [PATCH 1/7] x86/hvm: Correctly identify implicit supervisor accesses

[Tim Deegan <tim@xxxxxxx>]

At 14:03 +0000 on 27 Feb (1488204192), Andrew Cooper wrote:
> All actions which refer to the active ldt/gdt/idt or task register
> (e.g. loading a new segment selector) are known as implicit supervisor
> accesses, even when the access originates from user code.
> 
> The distinction is necessary in the pagewalk when SMAP is enabled.  Refer to
> Intel SDM Vol 3 "Access Rights" for the exact details.
> 
> Introduce a new pagewalk input, and make use of the new system segment
> references in hvmemul_{read,write}().  While modifying those areas, move the
> calculation of the appropriate pagewalk input before its first use.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Tim Deegan <tim@xxxxxxx>

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