Short week (2 days off)
== Progress ==
* GCC:
- looked at what's needed to enable -mexecute-only on v6m
* GCC upstream validation:
- reported a couple of issues.
* misc:
- infra fixes / troubleshooting / reviews
- catching up after Connect (internal debrief, ...)
- started looking at GNU Cauldron presentations
== Next ==
* FDPIC: resume work on GDB
* GCC: execute-only/v6m
* Binutils: support non-contiguous memory regions in linker
Slightly overlong this time as it covers pre&post connect weeks.
QEMU Tooling ([VIRT-252])
=========================
[VIRT-252] https://projects.linaro.org/browse/VIRT-252
[VIRT-280] https://projects.linaro.org/browse/VIRT-280
QEMU plugin support ([VIRT-280])
- sporadic work on the [v5 branch]
- posted {PATCH v6 0/6} semihosting cleanups (plus minor tests/tcg
tweak) Message-Id: <20190913151845.12582-1-alex.bennee(a)linaro.org>
- now merged - delta down a little ;-)
[VIRT-280] https://projects.linaro.org/browse/VIRT-280
[v5 branch] https://github.com/stsquad/qemu/tree/plugins/plugins-v5
GSoC Mentoring Afermath ([VIRT-348])
- more work preparing [subset for final list review]
- stats, CONFIG_PROFILER and perf integration
- dropped coverset and dot diagram as a bit too rough
- however should form a good basis going forward
[VIRT-348] https://projects.linaro.org/browse/VIRT-384
[subset for final list review]
https://github.com/stsquad/qemu/tree/tcg/tbstats-and-perf
ARMv8.1 VHE Extensions ([VIRT-263])
===================================
- worked with rth to get a minimal testcase
- very messy [wip branch]
[VIRT-263] https://projects.linaro.org/browse/VIRT-263
[wip branch] https://github.com/rth7680/qemu/tree/test-vhe
Upstream Work ([VIRT-109])
==========================
- posted {PATCH v3 00/33} testing/next (docker,tcg, alpha ;-)
Message-Id: <20190924210106.27117-1-alex.bennee(a)linaro.org>
- posted {RFC PATCH} configure: deprecate 32 bit build hosts
Message-Id: <20190925233013.6449-1-alex.bennee(a)linaro.org> mostly to
stimulate discussion of our modest proposal
- posted {PULL 00/28} testing updates (docker,podman,tcg,alpha)
Message-Id: <20190926183553.13895-1-alex.bennee(a)linaro.org>
- posted {PATCH} accel/kvm: ensure ret always set Message-Id:
<20191002102212.6100-1-alex.bennee(a)linaro.org>
[VIRT-109] https://projects.linaro.org/browse/VIRT-109
Other Activities
================
- More Connect travel administrava (airport transfer booked now)
- Connect itself
- many interesting talks
- discussions with bemi w.r.t migration and command line opts
- discussions with rth w.r.t 64/32, VHE and PR process
- discussions with FutureWei w.r.t scaling QEMU emulation
- KVM Forum administrava
Completed Reviews [2/2]
=======================
{PATCH} configure: Remove s390 (31-bit mode) from the list of supported CPUs
Message-Id: <20190928190334.6897-1-thuth(a)redhat.com>
{PATCH v2} s390x/tcg: MVCL: Exit to main loop if requested
Message-Id: <20191002082636.7739-1-david(a)redhat.com>
Absences
========
- KVM Forum Oct 29th-Nov 1st
Current Review Queue
====================
* {PATCH v2 00/15} target/arm: Implement semihosting v2.0
Message-Id: <20190916141544.17540-1-peter.maydell(a)linaro.org>
Added: <2019-10-03 Thu>
* {PATCH 00/19} hw/arm/raspi: Improve Raspberry Pi 2/3 reliability
Message-Id: <20190926173428.10713-1-f4bug(a)amsat.org>
Added: <2019-09-27 Fri>
* {PATCH RFC} docker: automatic dependencies for dockerfiles
Message-Id: <20190920001823.23279-1-jsnow(a)redhat.com>
Added: <2019-09-24 Tue>
* {PATCH v4 0/9} target/arm/kvm: enable SVE in guests
Message-Id: <20190924113105.19076-1-drjones(a)redhat.com>
Added: <2019-09-24 Tue>
--
Alex Bennée
On buildbot duty
- Several buildbot failures to investigate along with one linux kernel
regression
- Didn't manage to get the libcxx buildbot failures resolved on time.
I think the community are still trying to fix it (Script needs to be
Python2/Python3
Started work on LLD support for Morello
- Getting familiar with the toolchain
- First target is sufficient support to statically link the Howdy
"hello world" equivalent.
- Made the first couple of local patches to implement the easiest set
of static relocations.
Some upstream LLD patch review.
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ investigated the cause of a hang when using single-threaded TCG
+ sent RFC patchset proposing a rework of the ptimer API/implementation
which will fix LP:1777777. Unfortunately we'll need to update all
the devices using ptimers. I started in on that process of conversion,
which turns out to be a little more awkward than I had expected;
I ran into at least one corner case I hadn't thought about.
thanks
-- PMM
== Progress ==
* Out of office on Monday
* Catching up after Connect
* Minor buildbot fix
* IR SVE Reviews [LLVM-545]
- Another round on the size queries patch
* SVE IR fuzzer [LLVM-586]
- Waiting for the size queries patch to get merged so I can give it a spin
* Support Arran fat pointers in LLDB [LLVM-597]
- Built lldb
- Looked a bit through the docs
== Plan ==
* Play more with lldb, read more docs
* A bit of globalisel maintenance
o LLVM:
* Buildbots babysitting:
- Troubleshot ARMv8 selfhosted bots issue
* Machine Outliner:
- Experiment outlining with -mexecute-only
- Tried to find a testcase which exhibits issues with unwinding
without much success.
o Misc
* Various meetings and discussions.
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ identified cause of LP:1844597 and sent patch fixing it (we broke
direct-booting kernels when the emulated system has an AArch32 EL3)
+ tracked down the cause of LP:1777777 to a race condition that's
inherent to the current design of QEMU's 'ptimer' countdown timers;
fixing this will require us to rethink when we call the callback
when a ptimer hits 0. Posted some ideas to mailing list, for feedback
on whether I missed a better way to rework them.
+ usual upstream maintainer stuff; managed one way or another to
get a few of the most obstinately sticky patchsets off my to-review list
thanks
-- PMM
== Progress ==
* GCC:
- FDPIC: Whole series now committed. Reverted one patch (aiming at
cortex-M, caused problems in ARM mode, investigating)
* GCC upstream validation:
- reported a couple of issues. Helped with testing.
- getting ready to add cortex-m33 validation with qemu
* Binutils:
- Non-contiguous memory regions support in the BFD linker: not started yet.
* misc:
- infra fixes / troubleshooting / reviews
== Next ==
Linaro Connect San Diego
== Progress ==
* Out of office on Friday
* Use newer perf for benchmarking [TCWG-1512]
- Switched benchmarking to use bionic containers, with perf 4.18.0;
seems to work
* Investigate running benchmarks in containers [TCWG-1513]
- Done
* Uploaded LLVM 9.0.0-rc5 and rc6
* SVE IR fuzzer [LLVM-586]
- Unblocked my work on this, need to give it a serious spin
== Plan ==
* Buildbot babysitting this week
* LLVM-586
* Try to build LLDB
[VIRT-327 # Richard's upstream QEMU work ]
Convert notdirty and rom handling to cputlb; lots of cleanup around
that area. Version 3 is the first version that worked; two previous
RFCs took quite a bit of effort to work out why they didn't work.
[GCC]
Committed the lse out-of-line patch set.
Posted patches for two follow-on bugs affecting aarch64-elf.
r~
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ sent v2 of the semihosting v2 API implementation patchset
+ sent patch to fix a Makefile bug I introduced that broke in-tree builds
+ code review etc
thanks
-- PMM
[VIRT-327 # Richard's upstream QEMU work ]
Posted v2 of fixing tlb bswap.
Fixed a regression in arm SMLAL*
Reviewed v2 of risc-v vector extension (ugh).
Created pull for Sven's target/hppa fixes.
[GNU Cauldron]
* Project Ranger: New extensible representation for value ranges.
* Lightning talks, a new gdbserver.
- too short to have enough details to be useful.
- incomplete enough that no demo possible.
- maybe look back at this when it's more developed.
* Register allocation BOF
* ARM BOF
- MTE is alive! In that there are now RFC patches for glibc and gcc.
It's probably time to revive my MTE patch set, at least for system mode.
I spent quite a long time talking with Richard Earnshaw about the
current state of affairs. I'm hoping that we can get the kernel folk
to agree on some fundamentals of the userland ABI, even perhaps before
the final support is in the kernel, so that we can implement the
linux-user side, which would probably be most helpful for glibc+gcc work.
* GCC Steering Committee
* Rethinking GCC development process + continuous testing
* Truly interprocedural IPA-SRA
* Lightning talks,
- EmBench
- Combined elimination for -Os.
* RISC-V BOF
r~
o LLVM:
* Buildbots babysitting:
- Reported a kernel build issue after clang handling of
-march/-mfpu and crypto option was changed.
* Machine Outliner:
- Disabling Thumb1 outlining until we find a better way to handle tailcalls
- Working on Connect slides
o Misc
* Various meetings and discussions.
== Progress ==
* GCC:
- FDPIC: Committed the whole series, expect for one testsuite patch,
pending final review.
* GCC upstream validation:
- reported a couple of issues. Helped with testing.
- getting ready to add cortex-m33 validation with qemu
* Binutils:
- Non-contiguous memory regions support in the BFD linker: not started yet.
* misc:
- infra fixes / troubleshooting / reviews
== Next ==
- binutils/linker support for non-contiguous memory regions
- FDPIC: work on gdb
- GCC upstream validation: Add a config for cortex-m33 (v8-m)
LLVM-579 Implement -fix-cortex-a8 in LLD. Keeping up with review
comments, I think this is getting close now.
Connect slides moving forwards. Now have 2 out of 3 presenters done.
Rest of the week taken up by investigations and LLD reviews.
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ implemented and sent patchset for semihosting v2 API
+ target-arm pullreq, patch review, etc
+ got the QEMU Summit invite list finalised and sent invites
+ some internal meetings
thanks
-- PMM
== Progress ==
* Investigate running benchmarks in containers [TCWG-1513]
- Finally merged, after a few more iterations and testing!
- Doesn't work for AArch32 yet but I think I have a fix
* Use newer perf for benchmarking [TCWG-1512]
- Tried 4.15.0-62 generic on the TK1, doesn't seem to work; investigating
* SVE IR fuzzer [LLVM-586]
- Didn't get to work much on it
* Uploaded LLVM 9.0.0-rc4
== Plan ==
* Fix AArch32 benchmarking
* TCWG-1512 and LLVM-586
o LLVM:
* Buildbots babysitting
* Machine Outliner:
- Experiments on Zephyr exposed some issues w/r to unwinding and
relocation overflow, working on these.
o Misc
* Various meetings and discussions.
Hi guys. Due to unfortunate baggage handling, I don't have my laptop and
won't be able to log in Monday. I should be back online Tuesday, all going
well.
r~
Progress:
+ usual upstream maintainership stuff
+ notably, finished review of RTH's decodetree conversion patchset,
got it into master
+ started on implementing semihosting v2 API (the most interesting
new feature of which is support for AArch32 binaries exiting with
a specified exit status)
thanks
-- PMM
== Progress ==
* GCC:
- FDPIC: almost OK. Found minor issues with testcases
* GCC upstream validation:
- reported a couple of issues. Helped with testing.
- getting ready to add cortex-m33 validation with qemu
* Binutils:
- Non-contiguous memory regions support in the BFD linker: not started yet.
* misc:
- infra fixes / troubleshooting / reviews
- a bit of Jira
== Next ==
GCC:
- commit FDPIC patches after final validation
- binutils/linker support for non-contiguous memory regions
- GCC upstream validation: Add a config for cortex-m33 (v8-m)
