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x86/pv: Rework arch_local_irq_restore() to not use popf

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POPF is a rather expensive operation, so don't use it for restoring
irq flags. Instead, test whether interrupts are enabled in the flags
parameter and enable interrupts via STI in that case.

This results in the restore_fl paravirt op to be no longer needed.

Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210120135555.32594-7-jgross@suse.com
This commit is contained in:
Juergen Gross 2021-01-20 14:55:46 +01:00 • committed by Borislav Petkov
commit ab234a260b
10 changed files with 8 additions and 93 deletions
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