KVM: PPC: Book3S HV: Fix incorrect userspace exit on ioeventfd write

When the guest does an MMIO write which is handled successfully by an
ioeventfd, ioeventfd_write() returns 0 (success) and
kvmppc_handle_store() returns EMULATE_DONE.  Then
kvmppc_emulate_mmio() converts EMULATE_DONE to RESUME_GUEST_NV and
this causes an exit from the loop in kvmppc_vcpu_run_hv(), causing an
exit back to userspace with a bogus exit reason code, typically
causing userspace (e.g. qemu) to crash with a message about an unknown
exit code.

This adds handling of RESUME_GUEST_NV in kvmppc_vcpu_run_hv() in order
to fix that.  For generality, we define a helper to check for either
of the return-to-guest codes we use, RESUME_GUEST and RESUME_GUEST_NV,
to make it easy to check for either and provide one place to update if
any other return-to-guest code gets defined in future.

Since it only affects Book3S HV for now, the helper is added to
the kvm_book3s.h header file.

We use the helper in two places in kvmppc_run_core() as well for
future-proofing, though we don't see RESUME_GUEST_NV in either place
at present.

[paulus@samba.org - combined 4 patches into one, rewrote description]

Suggested-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 8 insertions, 3 deletions

diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index 83851aabfdc8..bb1e38a23ac7 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -304,6 +304,11 @@ static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
         return vcpu->arch.fault_dar;
 }
 
+static inline bool is_kvmppc_resume_guest(int r)
+{
+        return (r == RESUME_GUEST || r == RESUME_GUEST_NV);
+}
+
 /* Magic register values loaded into r3 and r4 before the 'sc' assembly
  * instruction for the OSI hypercalls */
 #define OSI_SC_MAGIC_R3                 0x113724FA
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 17fc9496b6ac..3b498d942a22 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1530,7 +1530,7 @@ static void kvmppc_run_core(struct kvmppc_vcore *vc)
                 vcpu->arch.trap = 0;
 
                 if (vcpu->arch.ceded) {
-                        if (ret != RESUME_GUEST)
+                        if (!is_kvmppc_resume_guest(ret))
                                 kvmppc_end_cede(vcpu);
                         else
                                 kvmppc_set_timer(vcpu);
@@ -1541,7 +1541,7 @@ static void kvmppc_run_core(struct kvmppc_vcore *vc)
         vc->vcore_state = VCORE_INACTIVE;
         list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
                                  arch.run_list) {
-                if (vcpu->arch.ret != RESUME_GUEST) {
+                if (!is_kvmppc_resume_guest(vcpu->arch.ret)) {
                         kvmppc_remove_runnable(vc, vcpu);
                         wake_up(&vcpu->arch.cpu_run);
                 }
@@ -1731,7 +1731,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
                                 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
                         srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
                 }
-        } while (r == RESUME_GUEST);
+        } while (is_kvmppc_resume_guest(r));
 
  out:
         vcpu->arch.state = KVMPPC_VCPU_NOTREADY;