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Andrew Cooper
743fd27306
... disabled by default. There is a lot of work before FRED can be enabled by default. One part of FRED, the LKGS (Load Kernel GS) instruction, is enumerated separately but expected to be mandatory as FRED disallows the SWAPGS instruction. Normally, we'd have to check both CPUID bits, but Xen does not use GS like most other software, and can manage without LKGS. FRED formally removes the use of Ring1 and Ring2, meaning we cannot run 32bit PV guests. As already done with CET, disable PV32 if using FRED, except in shim mode where FRED is disabled by default. No functional change. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>
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