Re: [Xen-devel] [PATCH v2 3/5] x86/boot: Drop explicit %fs uses

[Jan Beulich <jbeulich@xxxxxxxx>]

On 17.01.2020 21:42, Andrew Cooper wrote:
> The trampoline relocation code uses %fs for accessing Xen, and this comes with
> an arbitrary 16M limitation.  We could adjust the limit, but the boot code is
> a confusing mix of %ds/%esi-based and %fs-based accesses, and the use of %fs
> is longer to encode, and incurs an address generation overhead.
> 
> Rewrite the logic to use %ds, for better consistency with the surrounding
> code, and a marginal performance improvement.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>


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