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Re: [Qemu-devel] [RFC PATCH V7 11/19] tcg: switch on multithread.


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC PATCH V7 11/19] tcg: switch on multithread.
Date: Thu, 13 Aug 2015 13:17:14 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0


On 10/08/2015 17:27, address@hidden wrote:
> +    while (!cpu->exit_request) {
>          qemu_clock_enable(QEMU_CLOCK_VIRTUAL,
>                            (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0);
>  
> @@ -1507,7 +1480,7 @@ static void tcg_exec_all(void)
>          }
>      }
>  
> -    first_cpu->exit_request = 0;
> +    cpu->exit_request = 0;

One issue here is that when tcg_cpu_exec returns EXCP_HALTED, the
function keeps looping.  There is no need to set cpu->exit_request in
that case, since in fact there is no request pending, so the while loop
probably should be an "if".

Also, cpu->interrupt_request is not protected by any mutex, so
everything apart from the non-zero test must take the iothread mutex.

Paolo



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