[PATCH v2 2/7] KVM: s390: Return -EFAULT instead of PGM_ADDRESSING

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

If kvm_s390_set_cmma_bits() is asked to set CMMA values outside of a
memslot, PGM_ADDRESSING (5) is returned, instead of a negative error
value. Same issue with kvm_s390_{g,s}et_skeys().

Fix by returning -EFAULT whenever the return value would be > 0, which
is consistent with the behaviour before the gmap rewrite.

Fixes: e38c884df921 ("KVM: s390: Switch to new gmap")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 374dae6dae81..53691aaf6534 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2212,7 +2212,7 @@ static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
 	}
 
 	kvfree(keys);
-	return r;
+	return r <= 0 ? r : -EFAULT;
 }
 
 static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
@@ -2274,7 +2274,7 @@ static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
 	kvm_s390_free_mmu_cache(mc);
 out:
 	kvfree(keys);
-	return r;
+	return r <= 0 ? r : -EFAULT;
 }
 
 /*
@@ -2384,7 +2384,7 @@ static int kvm_s390_set_cmma_bits(struct kvm *kvm,
 
 	set_bit(GMAP_FLAG_USES_CMM, &kvm->arch.gmap->flags);
 
-	return r;
+	return r <= 0 ? r : -EFAULT;
 }
 
 /**
-- 
2.55.0