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Linux 5.16 compat: restore FSR and FSAVE 

Commit 3b52ccd7d introduced a flaw where FSR and FSAVE are not restored
when using a Linux 5.16 kernel.  These instructions are only used when
XSAVE is not supported by the processor meaning only some systems will
encounter this issue.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Attila Fülöp <attila@fueloep.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #13210
Closes #13236
This commit is contained in:
Brian Behlendorf 2022-03-19 12:48:28 -07:00 committed by GitHub
parent 421750672b
commit 9e3619c535
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 2 deletions
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4
include/os/linux/kernel/linux/simd_x86.h
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@ -420,9 +420,9 @@ kfpu_end(void)
if (static_cpu_has(X86_FEATURE_XSAVE)) {
kfpu_do_xrstor("xrstor", &state->xsave, ~0);
} else if (static_cpu_has(X86_FEATURE_FXSR)) {
kfpu_save_fxsr(&state->fxsave);
kfpu_restore_fxsr(&state->fxsave);
} else {
kfpu_save_fsave(&state->fsave);
kfpu_restore_fsave(&state->fsave);
}
out:
local_irq_enable();