On 2024-12-16 10:21, Christoph Schlameuss wrote:
Prevent null pointer dereference when processing KVM_IRQ_ROUTING_S390_ADAPTER routing entries. The ioctl cannot be processed for ucontrol VMs.
Fixes: f65470661f36 ("KVM: s390/interrupt: do not pin adapter interrupt pages") Signed-off-by: Christoph Schlameuss schlameuss@linux.ibm.com
Tested-by: Hariharan Mari hari55@linux.ibm.com
Documentation/virt/kvm/api.rst | 3 +++ arch/s390/kvm/interrupt.c | 2 ++ 2 files changed, 5 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 454c2aaa155e..f15b61317aad 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -1914,6 +1914,9 @@ No flags are specified so far, the corresponding field must be set to zero. #define KVM_IRQ_ROUTING_HV_SINT 4 #define KVM_IRQ_ROUTING_XEN_EVTCHN 5
+On s390, adding a KVM_IRQ_ROUTING_S390_ADAPTER is rejected on ucontrol VMs with +error -EINVAL.
flags:
- KVM_MSI_VALID_DEVID: used along with KVM_IRQ_ROUTING_MSI routing
entry diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 22d73c13e555..d4f031e086fc 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -2898,6 +2898,8 @@ int kvm_set_routing_entry(struct kvm *kvm, switch (ue->type) { /* we store the userspace addresses instead of the guest addresses */ case KVM_IRQ_ROUTING_S390_ADAPTER:
if (kvm_is_ucontrol(kvm))return -EINVAL;