[RFC PATCH v1 16/17] accel/kvm: terminate on a system event of a CoVE guest

[Baolong Duan <blduan@linux.alibaba.com>]

The TSM does not honour a power off request for a TEE VM: the vCPU
re-enters KVM_RUN and reports the same system event again, so QEMU never
shuts the guest down.  Terminate the process instead.

This works around a missing piece of the TSM ABI rather than something
QEMU should be doing.

Signed-off-by: Baolong Duan <blduan@linux.alibaba.com>
---
 accel/kvm/kvm-all.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 7b33a9aa3a..938bbebcd1 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -3613,6 +3613,17 @@ int kvm_cpu_exec(CPUState *cpu)
             break;
         case KVM_EXIT_SYSTEM_EVENT:
             trace_kvm_run_exit_system_event(cpu->cpu_index, run->system_event.type);
+            /*
+             * The TSM does not honour power_off for a TVM: the vCPU would
+             * re-enter KVM_RUN and report the same event forever, so
+             * terminate QEMU right away.
+             */
+            if (riscv_cove_vm_active()) {
+                warn_report("CoVE VM: system event %d, terminating",
+                            run->system_event.type);
+                exit(run->system_event.type == KVM_SYSTEM_EVENT_SHUTDOWN ?
+                     0 : 1);
+            }
             switch (run->system_event.type) {
             case KVM_SYSTEM_EVENT_SHUTDOWN:
                 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
-- 
2.34.1