[Qemu-devel] Re: [PATCH 11/15] kvm: Rework inner loop of kvm_cpu_exec

[Marcelo Tosatti <mtosatti@redhat.com>]

On Fri, Mar 04, 2011 at 11:20:08AM +0100, Jan Kiszka wrote:
> Let kvm_cpu_exec return EXCP_* values consistently and generate those
> codes already inside its inner loop. This means we will now re-enter the
> kernel while ret == 0.
> 
> Update kvm_handle_internal_error accordingly, but keep
> kvm_arch_handle_exit untouched, it will be converted in a separate step.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>  kvm-all.c |   26 ++++++++++++++------------
>  1 files changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/kvm-all.c b/kvm-all.c
> index 2952499..cc652cf 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -848,7 +848,7 @@ static int kvm_handle_internal_error(CPUState *env, struct kvm_run *run)
>          fprintf(stderr, "emulation failure\n");
>          if (!kvm_arch_stop_on_emulation_error(env)) {
>              cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
> -            return 0;
> +            return EXCP_INTERRUPT;
>          }
>      }
>      /* FIXME: Should trigger a qmp message to let management know
> @@ -947,7 +947,7 @@ int kvm_cpu_exec(CPUState *env)
>  
>          if (ret == -EINTR || ret == -EAGAIN) {
>              DPRINTF("io window exit\n");
> -            ret = 0;
> +            ret = EXCP_INTERRUPT;
>              break;
>          }
>  
> @@ -956,7 +956,6 @@ int kvm_cpu_exec(CPUState *env)
>              abort();
>          }
>  
> -        ret = 0; /* exit loop */
>          switch (run->exit_reason) {

Better keep ret assignment here so default behaviour is to 
exit loop? EXCP_INTERRUPT.