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Re: [Qemu-devel] [PATCH 6/8] tcg/tci: disable MTTCG if TCI is enabled
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [PATCH 6/8] tcg/tci: disable MTTCG if TCI is enabled |
Date: |
Wed, 26 Jul 2017 09:02:04 +0100 |
User-agent: |
mu4e 0.9.19; emacs 25.2.50.3 |
Philippe Mathieu-Daudé <address@hidden> writes:
> Hi Peter,
>
> I think this patch belongs to 2.10, as there is no time to fix TCI +
> MTTCG. Should I RESEND it alone with "for 2.10" subject?
>
> One other option might be disable TCI if MTTCG enabled, but there is
> no ./configure option for MTTCG while there is for TCI.
>
> Regards,
>
> Phil.
>
> On 06/28/2017 10:02 PM, Philippe Mathieu-Daudé wrote:
>> TCI + MTTCG cause strange errors...
>>
>> $ arm-softmmu/qemu-system-arm -machine raspi2 -cpu cortex-a7 -smp 4
>> -accel tcg,thread=multi -kernel kernel7.img
>> qemu-system-arm: Guest expects a stronger memory ordering than the host
>> provides
>> This may cause strange/hard to debug errors
>> Segmentation fault (core dumped)
So this isn't TCI enabling MTTCG by accident - this is the user forcing
it when it wouldn't otherwise be enabled. Hence the scary warning...
>>
>> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
>> ---
>> configure | 6 +++++-
>> 1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/configure b/configure
>> index c571ad14e5..510f443e06 100755
>> --- a/configure
>> +++ b/configure
>> @@ -6225,7 +6225,11 @@ fi
>> if test "$target_softmmu" = "yes" ; then
>> echo "CONFIG_SOFTMMU=y" >> $config_target_mak
>> if test "$mttcg" = "yes" ; then
>> - echo "TARGET_SUPPORTS_MTTCG=y" >> $config_target_mak
>> + if test "$tcg_interpreter" = "yes" ; then
>> + echo "TCI enabled, disabling MTTCG"
>> + else
>> + echo "TARGET_SUPPORTS_MTTCG=y" >> $config_target_mak
>> + fi
>> fi
>> fi
>> if test "$target_user_only" = "yes" ; then
>>
--
Alex Bennée