== Progress ==
* clang-tidy workshop (and associated prep)
- I think this went really well, we got good feedback from some of
the participants
* Trying to setup a build environment on tcwg-sq-02.tcwglab
- Mostly so I can deploy the SVE fuzzer there, but maybe for other things too
- All the compilers that I've tried so far are ICE-ing at some point
or another while building llvm
- Still looking into it but I'm starting to suspect there's
something fishy about this board
* Still no access to Morello docs
* Read a bit more about LLDB
* Finished annual review
== Plan ==
* Maybe THIS time I'll get access to the Morello docs next week
* If not, more SVE fuzzer
* One day off
o LLVM:
* Buildbots babysitting:
- Various breakage on the bots and in the kernel build
* Machine Outliner:
- preparing upstream submission
o Misc
* Various meetings and discussions.
== Progress ==
* GCC:
- Work on -mpure-code on v6m
* GCC upstream validation:
- reported several issues
* misc:
- infra fixes / troubleshooting / reviews
- watched a couple of GNU Cauldron presentations
== Next ==
* FDPIC: resume work on GDB
* GCC: pure-code/v6m
* Binutils: support non-contiguous memory regions in linker
[VIRT-263 # ARMv8.1-VHE Virtual Host Extensions ]
Still need to think of more test cases...
[VIRT-344 # ARMv8.5-MemTag, Memory Tagging Extension ]
Posted v5 of the system-only patch set,
with testing help from Alex.
[VIRT-327 # Richard's upstream QEMU work ]
Catching up on patch review
- arm semihosting
- tcg profiler
- ptimer transactions
- s390 mvcl interrupt
- started on v2 of dave martin's bti kernel patch set.
Posted v6 of my arm hflags patch set.
r~
== Progress ==
* Support Morello fat pointers in LLDB [LLVM-597]
- Read an intro to Cheri (research project that Morello is based on)
- Read more LLDB docs
* Started writing annual review
* Setup VM for a clang-tidy workshop that I'm co-organizing as part of
the Stockholm LLVM socials
== Plan ==
* Hopefully will get access to Morello docs next week so I can start actual work
* Rebase and play more with the SVE IR fuzzer [LLVM-586]
[VIRT-263 # ARMv8.1-VHE Virtual Host Extensions ]
Lots of work with Alex trying to produce a reduced test case.
We are now unit testing entry and exit from EL0 (EL2&0),
EL1 and EL0-in-EL1 (EL1&0).
Next would be to test the various memory access faults.
[VIRT-327 # Richard's upstream QEMU work ]
Patch review for SVE in KVM, S390 interrupt handling during MVCL.
r~
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)
== Progress ==
* Investigate running benchmarks in containers [TCWG-1513]
- Addressed review comments, merged changes to dockerfiles
- Fixed mcf on AArch64; also managed to run on armv7 but with some failures
* SVE IR fuzzer [LLVM-586]
- Didn't get to work much on it, but rebuilt it with debug info
* Uploaded LLVM 9.0.0-rc3
== Plan ==
* Investigate armv7 failures in docker
* Iterate on benchmarking patches
* Figure out why the fuzzer almost never introduces new code
* 2 vacation days left this month
[VIRT-327 # Richard's upstream QEMU work ]
Fix two ppc fp launchpad bugs.
Resurect patches for openrisc v1.3
Once-over review of risc-v vector extension.
Posted v3 of a32 coversion to decodetree.
Started poking at neon conversion to decodetree,
as a prerequisite to a32 support for fp16.
Some cleanups to watchpoints. Generic stuff now queued to tcg-next.
DavidH is taking care of target/s390x updates, but there are some
changes wanted within target/arm SVE code.
r~
== Progress ==
* GCC:
- FDPIC: sent updated patches, already got feedback on them. almost OK
* 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:
- handle feedback on FDPIC patches
- binutils/linker support for non-contiguous memory regions
- GNU-583
- GCC upstream validation: Add a config for cortex-m33 (v8-m)
== This Week ==
* GCC:
(i) PR86753 - Addressing upstream suggestions, pivoted to another approach.
(ii) PR91272 - Patch fixes issue but not correct approach, need to rework it.
(iii) PR78736 - Submitted patch upstream.
== Next Week ==
- Continue ongoing tasks.
== Progress ==
* Investigate running benchmarks in containers [TCWG-1513]
- Cleaned and uploaded scripts for comments
- mcf still hangs, but only when run with clang; investigating root cause
* SVE IR fuzzer [LLVM-586]
- Made some progress with the prototype but it still needs work
* Re-running 8.0.1 release on AArch64 since the archive on
llvm.org/releases seems to be broken
[VIRT-263 # ARMv8.1-VHE Virtual Host Extensions ]
Reorg ARMMMUIdx again; this time, do not overlap
EL1&0 and EL2&0 mmu_idx. This makes debugging a
bit easier.
Fix one more bug in EL2&0 selection. This was not
the last, because a nested kernel does not yet boot.
[VIRT-327 # Richard's upstream QEMU work ]
Another round of aa32 decodetree patches.
Another round of arm hflags patches.
Review of and some patches for cpu watchpoints.
r~
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ sent fix for LP:1840922 (incorrect handling of branches to
M-profile exception-return magic addresses in linux-user mode)
+ some more work on requirements for JIRA KVM related issues
+ started reviewing RTH's monster decodetree conversion patchset
(and made it nearly halfway through it)
thanks
-- PMM
== Progress ==
* GCC:
- FDPIC: handling feedback.
* GCC upstream validation:
- no issue to report this week.
* Binutils:
- Non-contiguous memory regions support in the BFD linker: not started yet.
* misc:
- infra fixes / troubleshooting
- qemu-4.1 confirmed OK for GCC validations
- trying validations for cortex-m33, found a few issues in GCC and a
small one in QEMU
- a bit of Jira
== Next ==
GCC:
- handle feedback on FDPIC patches
- binutils/linker support for non-contiguous memory regions
- GNU-583
- GCC upstream validation: Add a config for cortex-m33 (v8-m)
- Reorganised buildbots to remove some of the duplication between v7
and v8 AArch32 to free up more v7 hardware.
- Got final code-size information and wrote my slides for Linaro Connect
- Track down an AArch64 specific LLD problem due to a recent change,
now resolved.
- Wrote worst case thunk/veneer convergence patch to help move through
an iterative symbol assignment algorithm.
UK Bank Holiday Monday
== This Week ==
* GCC :
(i) PR83756: Addressing feedback from upstream.
(ii) PR90724: Committed to trunk.
(iii) PR91272: Started working on patch.
(iv) PR88839: Merged fix from sve-acle-branch to trunk.
* Validation
(i) Patch to separate build and test steps in tcwg_gnu.
(ii) SVE validation
== Next Week ==
- Continue ongoing tasks
== Progress ==
* Investigate running benchmarks in containers [TCWG-1513]
- Discussed the noise levels with the team and we decided to
continue with this
- mcf hangs, need to investigate the cause
- WIP: cleaning up the scripts so I can send a sensible patch for review
* IR SVE reviews [LLVM-545]
- Looked at some patches but didn't have much to add to what other people said
* SVE IR fuzzer [LLVM-586]
- Started prototyping
- The fuzzer relies a lot on inserting constants, and since we can't
produce SVE constants yet I'll have to dig in and get it to also use
function parameters
- Need to add operation descriptions for SVE
* Buildbot babysitting
- Reported an issue
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ unfortunately a late-breaking security-bug meant we needed an rc5, but
we put out the final 4.1.0 release on Thursday
+ code review:
- RTH's set of minor cleanups to the 32-bit arm codegen
+ sent out patches which fix our emulation of ATS instructions so
they cause exceptions when the spec says they should (a cleanup
of a change I'd half-implemented a year or so ago)
+ put together and sent the first target-arm pullreq for 4.2
* booked travel/hotel for KVM Forum; did some other prep like working
out a preliminary list of QEMU Summit invitees, and emailing people
whose GPG keys I need to sign to find out if they're going.
thanks
-- PMM
* Thursday off
== Progress ==
* GCC:
- FDPIC: handling feedback.
- noinit attribute: committed (ld patch too)
* GNU-583 (Fix Linux kernel built for Thumb-2 with GCC using LTO)
- no progress this week
* GCC upstream validation:
- a few issues reported this week.
* Binutils:
- Non-contiguous memory regions support in the BFD linker: not started
yet.
* misc:
- infra fixes / troubleshooting
== Next ==
GCC:
- handle feedback on FDPIC patches
- binutils/linker support for non-contiguous memory regions
- GNU-583
- GCC upstream validation: Add a config for cortex-m33 (v8-m)
QEMU Tooling ([VIRT-252])
=========================
QEMU plugin support ([VIRT-280])
- continued working through v4 comments on [next version branch]
- did some benchmarking to justify no fast path in translator_ld
[VIRT-280] https://projects.linaro.org/browse/VIRT-280
[next version branch]
https://github.com/stsquad/qemu/tree/plugins/plugins-v5
GSoC Mentoring ([VIRT-348])
- spent some time reviewing the current state and experimenting
[VIRT-348] https://projects.linaro.org/browse/VIRT-384
Upstream Work ([VIRT-109])
==========================
- more work on [my docker fixup branch]
- now can run make docker-test-build on qemu-test
- posted {PATCH v3 00/13} softfloat updates (include tweaks, rm LIT64)
Message-Id: <20190813124946.25322-1-alex.bennee(a)linaro.org>
[VIRT-109] https://projects.linaro.org/browse/VIRT-109
[my docker fixup branch]
https://github.com/stsquad/qemu/tree/testing/docker-def-and-buster-fixes
Completed Reviews [6/6]
=======================
{Qemu-devel} {PATCH v5 00/10} Measure Tiny Code Generation Quality
Message-Id: <20190815021857.19526-1-vandersonmr2(a)gmail.com>
- CLOSING NOTE [2019-08-15 Thu 20:45]
Looks pretty good but some racy crashes need to be fixed.
{Qemu-devel} {PATCH v1 0/2} Integrating qemu to Linux Perf
Message-Id: <20190815023725.2659-1-vandersonmr2(a)gmail.com>
- CLOSING NOTE [2019-08-15 Thu 20:46]
Needs a v2 with compile fixes
Absences
========
- Moving house & office ~20th/21st Aug
Current Review Queue
====================
* {PATCH v3 00/34} target/arm: Implement ARMv8.1-VHE
Message-Id: <20190803184800.8221-1-richard.henderson(a)linaro.org>
* {Qemu-devel} {PATCH v4 00/22} target/arm: Implement ARMv8.5-MemTag, system mode
Message-Id: <20190307170440.3113-1-richard.henderson(a)linaro.org>
* {Qemu-devel} {RFC PATCH} Implement qemu_thread_yield for posix, use it in mttcg to handle EXCP_YIELD
Message-Id: <20190717054655.14104-1-npiggin(a)gmail.com>
* {PATCH v3 0/6} tests/docker: add podman support
Message-Id: <20190713143311.17620-1-marcandre.lureau(a)redhat.com>
* {PATCH 0/2} tests/acceptance: Add test of NeXTcube framebuffer using OCR
Message-Id: <20190629150056.9071-1-f4bug(a)amsat.org>
* {Qemu-devel} {PATCH 0/4} Introduce the microvm machine type
Message-Id: <20190628115349.60293-1-slp(a)redhat.com>
--
Alex Bennée
- Fixed LLD segfault when exceptions.
- Implement large code model TLSLD relocations in LLD.
- More thoughts on MOVK prel relocations in the ABI as there looks to
be a use case for them in HWASAN that isn't covered by the existing
relocations.
- Some thoughts on how TCWG LLVM Jira initiatives could be worded and
how we may want to word them in the next cycle.
- Initial thoughts written down on Connect presentation, need to flesh
out more this week.
- Upgraded machine to 18.04, almost managed to break it in the process
but luckily it was recoverable. Will likely have some teething
problems.
