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KVM: s390: vsie: Fix redundant rmap entries

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The address passed to the gmap rmap was not being masked. As a
consequence several different (but functionally equivalent) rmap
entries were being created for each shadowed table.

Fix this by properly masking the address depending on the table level.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Fixes: a2c17f9270 ("KVM: s390: New gmap code")
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-05-19 17:01:13 +02:00
parent 2d505c2906
commit a488e753de
1 changed files with 3 additions and 1 deletions
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4
arch/s390/kvm/gmap.c
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@ -1025,6 +1025,7 @@ int gmap_insert_rmap(struct gmap *sg, gfn_t p_gfn, gfn_t r_gfn, int level)
int gmap_protect_rmap(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gfn_t p_gfn, gfn_t r_gfn,
kvm_pfn_t pfn, int level, bool wr)
{
unsigned long bitmask;
union crste *crstep;
union pgste pgste;
union pte *ptep;
@ -1041,8 +1042,9 @@ int gmap_protect_rmap(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gfn_t p_gf
if (rc)
return rc;
if (level <= TABLE_TYPE_REGION1) {
bitmask = -1UL << (8 + 11 * level);
scoped_guard(spinlock, &sg->host_to_rmap_lock)
rc = gmap_insert_rmap(sg, p_gfn, r_gfn, level);
rc = gmap_insert_rmap(sg, p_gfn, r_gfn & bitmask, level);
}
if (rc)
return rc;