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authorJanosch Frank <frankja@linux.vnet.ibm.com>2017-12-04 12:19:11 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2017-12-06 09:18:43 +0100
commitca76ec9ca871e67d8cd0b6caba24aca3d3ac4546 (patch)
tree9b18cd3ec7dd03b175d91a715b70d150b903cc54
parentbb64da9aba89765fee74b395967b18a7d6c364e9 (diff)
KVM: s390: Fix skey emulation permission check
All skey functions call skey_check_enable at their start, which checks if we are in the PSTATE and injects a privileged operation exception if we are. Unfortunately they continue processing afterwards and perform the operation anyhow as skey_check_enable does not deliver an error if the exception injection was successful. Let's move the PSTATE check into the skey functions and exit them on such an occasion, also we now do not enable skey handling anymore in such a case. Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Fixes: a7e19ab ("KVM: s390: handle missing storage-key facility") Cc: <stable@vger.kernel.org> # v4.8+ Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
-rw-r--r--arch/s390/kvm/priv.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 28b69ab56b7b..572496c688cc 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -232,8 +232,6 @@ static int try_handle_skey(struct kvm_vcpu *vcpu)
VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
return -EAGAIN;
}
- if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
- return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
return 0;
}
@@ -244,6 +242,9 @@ static int handle_iske(struct kvm_vcpu *vcpu)
int reg1, reg2;
int rc;
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
+
rc = try_handle_skey(vcpu);
if (rc)
return rc != -EAGAIN ? rc : 0;
@@ -273,6 +274,9 @@ static int handle_rrbe(struct kvm_vcpu *vcpu)
int reg1, reg2;
int rc;
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
+
rc = try_handle_skey(vcpu);
if (rc)
return rc != -EAGAIN ? rc : 0;
@@ -308,6 +312,9 @@ static int handle_sske(struct kvm_vcpu *vcpu)
int reg1, reg2;
int rc;
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
+
rc = try_handle_skey(vcpu);
if (rc)
return rc != -EAGAIN ? rc : 0;