[kvm-ppc-devel] [PATCH] avoid clobbering exit_reason

[Hollis Blanchard <hollisb@us.ibm.com>]

FYI, here's the fix for another nasty yet dumb bug in which we were
losing MMIOs by clobbering exit_reason when a signal is pending:

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -388,7 +388,9 @@ int kvmppc_handle_exit(struct kvm_run *r
 
        kvmppc_check_and_deliver_interrupts(vcpu);
 
-       if (signal_pending(current)) {
+       /* Only check for signals if we aren't already exiting for some other
+        * reason. This keeps us from clobbering exit_reason. */
+       if (!(r & RESUME_HOST) && signal_pending(current)) {
                run->exit_reason = KVM_EXIT_INTR;
                r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
        }

As far as I know, there are currently no more showstopper bugs, so we
can get back to making network IO work.

Updated patches are in the usual place: http://penguinppc.org/~hollisb/kvm/

-- 
Hollis Blanchard
IBM Linux Technology Center


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