Re: [Xen-devel] [PATCH 4/6] x86/AMD: Introduce and use X86_BUG_NULL_SEG

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Dec 28, 2018 at 12:39:34PM +0000, Andrew Cooper wrote:
> AMD processors don't clear the base or limit fields when loading a NULL
> segment, and Hygon processors inherit this behaviour.
> 
> Express the logic in terms of cpu_bug_null_seg, and rearrange
> preload_segment() have the more predictable condition first, not
> reference AMD specifically.
> 
> Tweak the inline ASM, as `mov %sreg` can be encoded with a memory
> operand.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>


Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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