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Re: [Qemu-devel] [PULL 5/8] target-sparc: Use global registers for the r

From: Mark Cave-Ayland
Subject: Re: [Qemu-devel] [PULL 5/8] target-sparc: Use global registers for the register window
Date: Fri, 24 Jun 2016 11:42:21 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.1.0

On 24/06/16 07:36, Paolo Bonzini wrote:

On 24/06/2016 05:57, Richard Henderson wrote:

Whatever happens, it happens after 10GB of logs, which is simply too
much to sift through.  I've tried to narrow it down, but the lack of a
hardware tlb refill means that we get hundreds of thousands of Data
Access Faults that are simply TLB misses and not the actual Segmentation
Fault in question.

It doesn't seem to affect other OSes, so I can't imagine what quirk is
being exercised in this case.

As loath as I am to suggest it, we may have to revert the sparc indirect
register patch for the release.

We have more than a month.  If it's reproducible, it can be fixed. :)

I do now ping the rest of my sparc improvements patchset.  It's
completely independent of the use of indirect registers.

Mark, perhaps you can try to use migration to reduce the amount of
logging?  (Start QEMU with -snapshot, try to stop the vm before it
fails.  If you succeed, do a "migrate exec:cat>foo.sav" followed by
"commit"; if you fail, try again).

Yeah, given the improvements that Richard has made, I'd prefer not to revert if at all possible. Finally I have some spare time today so I'll try and get this down to an easily-testable qcow2 image that can reproduce the issue.



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