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KVM: s390: vsie: Fix check for pre-existing shadow mapping

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When shadowing a nested guest, a check is performed and no shadowing is
attempted if the nested guest is already shadowed.

The existing check was incomplete; fix it by also checking whether the
leaf DAT table entry in the existing shadow gmap has the same protection
as the one specified in the guest DAT entry.

Fixes: e38c884df9 ("KVM: s390: Switch to new gmap")
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-03-26 14:17:12 +01:00
parent b827ef02f4
commit 6f93d1ed6f
1 changed files with 3 additions and 2 deletions
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5
arch/s390/kvm/gaccess.c
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@ -1506,8 +1506,9 @@ static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,
if (rc)
return rc;
/* A race occourred. The shadow mapping is already valid, nothing to do */
if ((ptep && !ptep->h.i) || (!ptep && crste_leaf(*table)))
/* A race occurred. The shadow mapping is already valid, nothing to do */
if ((ptep && !ptep->h.i && ptep->h.p == w->p) ||
(!ptep && crste_leaf(*table) && !table->h.i && table->h.p == w->p))
return 0;
gl = get_level(table, ptep);