On 08.08.2025 22:23, Andrew Cooper wrote: > Under FRED, SETSSBSY is unavailable, and we want to be setting up FRED prior > to setting up shadow stacks. Luckily, RSTORSSP will also work in this case. > > This involves a new type of shadow stack token, the Restore Token, which is > distinguished from the Supervisor Token by pointing to the adjacent slot on > the shadow stack rather than pointing at itself. > > In the short term, this logic still needs to load MSR_PL0_SSP. > > No functional change. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com>
