Re: [Qemu-devel] [PATCH for-2.12 0/2] RISC-V: Mark FP status dirty

[Richard W.M. Jones]

On Wed, Mar 28, 2018 at 10:22:31AM +0800, Richard Henderson wrote:
> Since it was my patch that broke FP state tracking in the
> first place, I feel obligated to fix it again.

I missed this patch, thanks Michael Clark for pointing it out to me.

I've just tried it now using my test reproducer of the bug
(http://oirase.annexia.org/tmp/sched.c) and Fedora/RISC-V and it
appears to fix the problem.

> Mark mstatus[fs] as dirty whenever we write to the file.
> This can be optimized by only doing so once within a TB
> which initially began with a clean file.
> 
> I have not yet put together an environment that can test
> this, so I'll need someone else to give it a go.

This is the Fedora stage4 disk image which works fine under qemu from
git (make sure you read the readme.txt file first):

  https://fedorapeople.org/groups/risc-v/disk-images/

Rich.

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