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Re: [Xen-devel] [PATCH v2 2/2] x86/desc: Build boot_{, compat_}gdt[] in C

On 09.08.2019 12:40, Jan Beulich wrote:
There is plenty more cleanup which can be done in the future.  As we are
64-bit, there is no need for load_TR() to keep the TSS in sync between the two
GDTs, which means it can drop all sgdt/lgdt instructions.

I'm trying to figure what exactly you mean here. Are you suggesting
we run with a TSS selector loaded whose descriptor's busy bit is
clear? I agree this shouldn't cause issues in the 64-bit world, but
it would still not feel right. Question is why they've retained the
avail/busy distinction in the first place.


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