On 09.08.2019 14:39, Andrew Cooper wrote:
Xen, being 64bit only these days, has no use for a 32bit Ring 0 code segment.
Delete __HYPERVISOR_CS32 and remove it from the GDTs. Also delete
__HYPERVISOR_CS64 and use __HYPERVISOR_CS uniformly.
Long, long ago we've been considering doing this. Agreed,
nothing has surfaced to actually use it, but I wouldn't
subscribe to "has no use": We will need it if we ever want
to be able to run on 32-bit EFI _and_ invoke runtime
services there. Back then through the consideration against
dropping it was that we may want to invoke 32-bit BIOS
services (PCI, VGA) from the hypervisor.
Of course it wouldn't be terribly difficult to re-instate
these selectors / descriptors, but still. Nevertheless, if
you're convinced of the move despite the remarks above ...
Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Acked-by: Jan Beulich <jbeul...@suse.com>
Jan
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