KVM: s390: Avoid potentially sleeping while atomic when zapping pages

Browse source

Factor out try_get_locked_pte(), which behaves similarly to
get_locked_pte(), but does not attempt to allocate missing tables and
performs a spin_trylock() instead of blocking.

The new function is also exported, since it will be used in other
patches.

If intermediate entries are missing, there can be no pte swap entry to
free, so it's safe to ignore them.

This avoids potentially sleeping while atomic.

Fixes: e38c884df9 ("KVM: s390: Switch to new gmap")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260602142356.169458-4-imbrenda@linux.ibm.com>

...

This commit is contained in:

Claudio Imbrenda 2026-06-02 16:23:49 +02:00

parent d1adc098ce

commit 89fa757931

2 changed files with 73 additions and 45 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

arch/s390/include/asm/gmap_helpers.h

View file

117

arch/s390/mm/gmap_helpers.c

View file