s390/mm: KVM: pv: when tearing down, try to destroy protected pages

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When ptep_get_and_clear_full is called for a mm teardown, we will now
attempt to destroy the secure pages. This will be faster than export.

In case it was not a teardown, or if for some reason the destroy page
UVC failed, we try with an export page, like before.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Link: https://lore.kernel.org/r/20220628135619.32410-11-imbrenda@linux.ibm.com
Message-Id: <20220628135619.32410-11-imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

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Claudio Imbrenda 2022-06-28 15:56:11 +02:00 • committed by Janosch Frank

parent ca2fd0609b

commit 9bf811dae4

1 changed files with 16 additions and 3 deletions

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arch/s390/include/asm/pgtable.h

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