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XSAVE state is thread-local. The kernel switches between thread
state at context switch time. Generally, running a selftest for
a while will naturally expose it to some context switching and
and will test the XSAVE code.
Instead of just hoping that the tests get context-switched at
random times, force context-switches on purpose. Spawn off a few
userspace threads and force context-switches between them.
Ensure that the kernel correctly context switches each thread's
unique AMX state.
[ dhansen: bunches of cleanups ]
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211026122525.6EFD5758@davehans-spike.ostc.intel.com
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