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Re: [PATCH] cpu_exec_step_atomic: update the cpu running flag
From: |
Richard Henderson |
Subject: |
Re: [PATCH] cpu_exec_step_atomic: update the cpu running flag |
Date: |
Fri, 15 Jan 2021 13:05:32 -1000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 9/21/20 9:42 PM, Douglas Crosher wrote:
>
> The cpu_exec_step_atomic() function is called with the cpu->running
> clear and proceeds to run target code without setting this flag. If
> this target code generates an exception then handle_cpu_signal() will
> unnecessarily abort.
>
> For example if atomic code generates a memory protection fault.
>
> This patch at least sets and clears this running flag.
>
> The related code paths look rather convoluted and it is not immediately clear
> that this patch comprehensively addresses the issue, but it might at least
> direct people to a problem, and it might be an incremental improvement, and it
> gets some code running here. The patch adds some assertions to help detect
> other cases.
>
> Signed-off-by: Douglas Crosher <dtc-ubuntu@scieneer.com>
Sorry this got overlooked, but better late than never.
Yes, this looks right, thanks.
Queued to tcg-next.
r~
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