Re: [RFC PATCH v3 00/22] arm64: livepatch: Use ORC for dynamic frame pointer validation

["Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>]

On 2/28/23 21:12, Tomohiro Misono (Fujitsu) wrote:
> <snip>
>> Testing
>> =======
>>
>> - I have run all of the livepatch selftests successfully. I have written a
>>   couple of extra selftests myself which I will be posting separately
> Hi,
> 
> What test configuration/environment you are using for test?
> When I tried kselftest with fedora based config on VM, I got errors
> because livepatch transition won't finish until signal is sent
> (i.e. it takes 15s for every transition).
> 

Sorry for not responding earlier. I was out sick.

I tested on a bare metal system (thunderx) running Ubuntu. I will try to reproduce
the error you are seeing on a VM running fedora.

Madhavan

> [excerpt from test result]
>   ```
>   $ sudo ./test-livepatch.sh
>   TEST: basic function patching ... not ok
>   
>   --- expected
>   +++ result
>   @@ -2,11 +2,13 @@
>    livepatch: enabling patch 'test_klp_livepatch'
>    livepatch: 'test_klp_livepatch': initializing patching transition
>    livepatch: 'test_klp_livepatch': starting patching transition
>   +livepatch: signaling remaining tasks
>    livepatch: 'test_klp_livepatch': completing patching transition
>   ```
> 
> Thanks,
> Tomohiro
> 
>>
>> - I have a test driver to induce a NULL pointer exception to make sure
>>   that unwinding through exception handlers is reliable.
>>
>> - I use the test driver to create a timer to make sure that unwinding through
>>   the timer IRQ is reliable.
>>
>> - I call the unwinder from different places during boot to make sure that
>>   the unwinding in each of those cases is reliable.
>>