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[Qemu-ppc] Determining interest in PPC e500spin, yield, and openpic patc
From: |
alarson |
Subject: |
[Qemu-ppc] Determining interest in PPC e500spin, yield, and openpic patches |
Date: |
Mon, 13 Jun 2016 18:08:30 -0500 |
We've used older versions of QEMU for several years as a virtual
target for our OS. Many thanks to the community for providing this
platform.
We've been working to get our OS running under QEMU 2.x and have
identified a few bugs in QEMU, have made some enhancements, and are
still tracking down some other curious behaviors. I'm looking for
some guidance as to how, and whether, you'd like patches for the
following.
1. There is a defect in ppce500_spin.c:spin_kick() that creates an
incorrectly sized TLB entry. This was reported as bug
https://bugs.launchpad.net/qemu/+bug/1587535 I can provide a
patch if desired.
2. We have implemented the PPC "yield" instruction. I can provide a
patch if desired.
3. We're working on support for openpic timers. We're not finished,
but it would be helpful to know if a patch is desired or if we
should expect to maintain the changes independently.
4. We're currently tracking down why in our e500 (both unicore and
multi-core) PPC QEMU 2.5 guest (x86 host), that with interrupts
disabled, after enabling the decrementer and issuing a "wait"
instruction QEMU continues to "busy loop", consuming an entire host
CPU doing apparently nothing. As expected, issuing a "wait" prior
to enabling the decrementer leaves the host process idle. We found
the bug in the PPC "wait" instruction implementation that was
independently reported and resolved last week, but that did not fix
the problem. We also have our OS running on the g3beige and using
MSR.POW which causes the host to "sleep", but we are having no joy
with e500 and "wait". Any pointers would be appreciated. When we
find something we'll report back.
- [Qemu-ppc] Determining interest in PPC e500spin, yield, and openpic patches,
alarson <=
- Re: [Qemu-ppc] Determining interest in PPC e500spin, yield, and openpic patches, Mark Cave-Ayland, 2016/06/14
- Re: [Qemu-ppc] Determining interest in PPC e500spin, yield, and openpic patches, David Gibson, 2016/06/15
- Re: [Qemu-ppc] Determining interest in PPC e500spin, yield, and openpic patches, alarson, 2016/06/15
- Re: [Qemu-ppc] [Qemu-devel] Determining interest in PPC e500spin, yield, and openpic patches, Thomas Huth, 2016/06/16
- [Qemu-ppc] PPC e500spin pir improperly initialized, alarson, 2016/06/17
- Re: [Qemu-ppc] PPC e500spin pir improperly initialized, Thomas Huth, 2016/06/20
- Re: [Qemu-ppc] Determining interest in PPC e500spin, yield, and openpic patches, David Gibson, 2016/06/16