KVM: s390: Fix _gmap_crstep_xchg_atomic()

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The previous incorrect behaviour cleared the vsie_notif bit without
returning false, which allowed shadow crstes to be installed without
the vsie_notif bit.

Return false and do not perform the operation if an unshadow event has
been triggered, but still attempt to clear the vsie_notif bit from the
existing crste.

This will prevent the installation of shadow crstes without vsie_notif
bit and will also prevent the caller from looping forever if it was
not checking for the sg->invalidated flag.

Fixes: b827ef02f4 ("KVM: s390: Remove non-atomic dat_crstep_xchg()")
Fixes: a2c17f9270 ("KVM: s390: New gmap code")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260602142356.169458-3-imbrenda@linux.ibm.com>

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Claudio Imbrenda 2026-06-02 16:23:48 +02:00

parent 29e8751c1d

commit d1adc098ce

1 changed files with 3 additions and 0 deletions

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arch/s390/kvm/gmap.h

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