pseries: Small cleanup to H_CEDE implementation
The H_CEDE hypercall implementation for the pseries machine doesn't trigger
quite the right path in the main cpu exec loop. We should set exit_request
to pop up one extra level and recheck state, and we should set the
exception_index to EXCP_HLT (H_CEDE is roughly equivalent to the hlt
instruction on x86).
In practice, this doesn't really matter except for KVM, and KVM implements
H_CEDE internally so we never hit this code path. But we might as well
get it right, just in case it matters some day.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c
index abd847f..2df94d1 100644
--- a/hw/spapr_hcall.c
+++ b/hw/spapr_hcall.c
@@ -544,6 +544,8 @@
hreg_compute_hflags(env);
if (!cpu_has_work(env)) {
env->halted = 1;
+ env->exception_index = EXCP_HLT;
+ env->exit_request = 1;
}
return H_SUCCESS;
}
