Re: [Xen-devel] [PATCH] x86/svm: Drop the suggestion of Long Mode Segment Limit support

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jul 23, 2018 at 03:42:37PM +0100, Andrew Cooper wrote:
> Because of a bug in 2010, LMSL support didn't functioned in Xen.
> 
> c/s f2c608444 noticed but avoided fixing the issue for migration reasons.  In
> addition to migration problems, changes to the segmentation logic for
> emulation would be needed before the feature could be enabled.
> 
> This feature is entirely unused by operating systems (probably owing to its
> semantics which only cover half the segment registers), and no one has
> commented on its absence from Xen.  As supporting it would involve a large
> amount of effort, it seems better to remove the code entirely.
> 
> If someone finds a valid usecase, we can resurrecting the code and
> implementing the remaining parts, but I doubt anyone will.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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

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