Re: [PATCH v2] target/i386: Revert monitor_puts() in do_inject_x86_mce()

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Mar 20, 2024 at 04:36:40PM +0800, Tao Su wrote:
> monitor_puts() doesn't check the monitor pointer, but do_inject_x86_mce()
> may have a parameter with NULL monitor pointer. Revert monitor_puts() in
> do_inject_x86_mce() to fix, then the fact that we send the same message to
> monitor and log is again more obvious.

Yikes, why do we have such a horrible trap-door in our
monitor output APIs.

Isn't the right fix here to make 'monitor_puts' check for
NULL & be a no-op, in the same way 'monitor_printf' does,
so the APIs have consistent behaviour.

> 
> Fixes: bf0c50d4aa85 (monitor: expose monitor_puts to rest of code)
> Reviwed-by: Xiaoyao Li <xiaoyao.li@intel.com>
> Reviewed-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Tao Su <tao1.su@linux.intel.com>
> ---
> v1 -> v2:
> - Instead revert the broken part of commit bf0c50d4aa85
> - Add Markus's Reviewed-by
> 
> v1:
> - https://lore.kernel.org/all/20240320052118.520378-1-tao1.su@linux.intel.com/
> ---
>  target/i386/helper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/target/i386/helper.c b/target/i386/helper.c
> index 2070dd0dda..23ccb23a5b 100644
> --- a/target/i386/helper.c
> +++ b/target/i386/helper.c
> @@ -430,7 +430,7 @@ static void do_inject_x86_mce(CPUState *cs, run_on_cpu_data data)
>          if (need_reset) {
>              emit_guest_memory_failure(MEMORY_FAILURE_ACTION_RESET, ar,
>                                        recursive);
> -            monitor_puts(params->mon, msg);
> +            monitor_printf(params->mon, "%s", msg);
>              qemu_log_mask(CPU_LOG_RESET, "%s\n", msg);
>              qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
>              return;
> 
> base-commit: c62d54d0a8067ffb3d5b909276f7296d7df33fa7
> -- 
> 2.34.1
> 
> 

With regards,
Daniel
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