KVM: s390: Fix _gaccess_shadow_fault()

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In some circumstances, it is possible that the page of nested guest
memory that is being shadowed is not present at all in the parent guest
gmap. dat_entry_walk() will not find any leaf entry and return with
-ENOENT, which will erroneously be propagated all the way to userspace.

Fix by manually calling gmap_link() on the memory of the nested guest
that is being shadowed if the mapping was not already present.

Fixes: e38c884df9 ("KVM: s390: Switch to new gmap")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260828115439.145885-4-imbrenda@linux.ibm.com>

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Claudio Imbrenda 2026-08-28 13:54:34 +02:00

parent ae12d2f9c1

commit faff4c8ff3

1 changed files with 13 additions and 0 deletions

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arch/s390/kvm/s390/gaccess.c

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