== 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.
o LLVM:
* Machine Outliner:
- Improved stack fixup handling (remove cnadidates when it is not
bebeficial)
- Fixing an issue related to R12 usage.
o Misc
* Various meetings and discussions.
[VIRT-327 # Richard's upstream QEMU work ]
Posted v4 of arm hflags reorg.
Split out 3 minor patch sets from the larger aa32 decodetree set.
Reviewed v6 of invert-endian tlb patch set.
Reviewed ajb's fpu header reorg.
Posted an RFC vs Andrew Jones' SVE-in-KVM patch set.
r~
QEMU Tooling ([VIRT-252])
=========================
- working through v4 comments on [next version branch]
[next version branch]
https://github.com/stsquad/qemu/tree/plugins/plugins-v5
Upstream Work ([VIRT-109])
==========================
- spent some more time looking at TCG EL2 behaviour
- there is something not working properly even without the VHE
patches
- need to do some tooling work to be able to properly debug HYP code
- posted {PATCH v1 0/7} softfloat header cleanups Message-Id:
<20190808164117.23348-1-alex.bennee(a)linaro.org>
- posted {PATCH v2 0/7} softfloat includes cleanup Message-Id:
<20190809091940.1223-1-alex.bennee(a)linaro.org>
- posted {PATCH v1 0/2} docker DEF_TARGET_LIST cleanup Message-Id:
<20190809155047.24526-1-alex.bennee(a)linaro.org>
[VIRT-109] https://projects.linaro.org/browse/VIRT-109
Completed Reviews [6/6]
=======================
{Qemu-arm} {PATCH 0/2} target/arm: Fix routing of singlestep exceptions
Message-Id: <20190805130952.4415-1-peter.maydell(a)linaro.org>
- CLOSING NOTE [2019-08-07 Wed 11:47]
Looks good, would be nice to integrate a better testcase
{PATCH} gdbstub: Fix handling of '!' packet with new infra
Message-Id: <20190805190901.14072-1-ramiro.polla(a)gmail.com>
- CLOSING NOTE [2019-08-07 Wed 11:59]
Queued to my tree
{PATCH 0/3} tests/tcg: disentangle makefiles
Message-Id: <20190730123759.21723-1-pbonzini(a)redhat.com>
{Qemu-devel} {PATCH v2 00/29} Tame a few "touch this, recompile the world" headers
Message-Id: <20190806151435.10740-1-armbru(a)redhat.com>
- CLOSING NOTE [2019-08-07 Wed 17:32]
Looks OK but breaks a lot of cross compiles. More subtly to fix.
{Qemu-devel} {PATCH untested for-4.2} memory: fix race between TCG and accesses to dirty bitmap
Message-Id: <20190729214717.6616-1-pbonzini(a)redhat.com>
{PATCH v3 00/29} Tame a few "touch this, recompile the world" headers
Message-Id: <87k1bmpn7y.fsf(a)dusky.pond.sub.org>
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
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ we needed an rc4 for 4.1.0 (predictably), so herded the necessary
fixes into it
+ bug fixing:
- LP:1838913 : single-step exceptions were always being taken to EL1,
even if the guest configured debug exceptions to go to EL2 or EL3
- LP:1815423 : x86 TCG bug where we were giving the wrong result for
SSE float-to-int conversions that raised the 'invalid' exception
- LP:1796520 and LP:1839325 : started investigating some sh4 linux-user bugs
+ code review:
- patch to implement aspeed SD controller model
- Eric Auger's patchset of minor SMMUv3 fixes
- Aspeed GPIO controller model
- v3 of the GreenSocs reset-handling refactoring
- RTH's preliminary cleanup of handling of PC in arm decoder
thanks
-- PMM
[VIRT-263 # ARMv8.1-VHE Virtual Host Extensions ]
Posted a couple of revisions. Good feedback between this
and MemTag, both of which need to adjust the set of TLBs.
[VIRT-339 # ARMv8.5-BTI, Branch Target Identification ]
Posted v7.
[VIRT-344 # ARMv8.5-MemTag, Memory Tagging Extension ]
Rebased upon current VHE+BTI work. Updated from beta manuals
to the ARM ARM issue E.a manual.
[VIRT-327 # Richard's upstream QEMU work ]
Reviewed v1 x86 gen_sse rewrite.
Reviewed Alex's v4 plugin patchset.
r~
o LLVM:
* Bots babysitting
* Machine Outliner:
- Rebased branch on upstream
- Working on stack fixup limits test cases
o Misc
* Various meetings and discussions.
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ QEMU 4.1.0 rc3 sent out. As usual, we've found some last minute
bugs and we'll need an rc4 next week...
+ patch review:
- series from Philippe making some cleanups to use object_initialize_child()
and friends
- Alex's patch "generate a custom MIDR for -cpu max"
- made a start on reviewing RTH's 32-bit arm decodetree conversion
+ bug fixing:
- LP:1838277 : we were taking exceptions caused by BRK instructions at
EL2 to EL1, rather than to EL2; sent a patch fixing this
- LP:1838475 : FPU register stacking in M-profile CPUs without the
Security Extensions was incorrectly failing an NSACR check and
taking a bogus exception: sent a patch to fix
+ wrote a patchset that converts the sparc target away from the
deprecated and broken do_unassigned_access hook to use the new-in-2017
do_transaction_failure hook instead; one step closer to being able
to remove the old hook entirely...
+ did the same for the mips target
thanks
-- PMM
== This Week ==
* PR86753
- Working on approach suggested by Richard.
* PR90724
- Pinged upstream.
* Validation
- Merged patch to jenkins-scripts to add testsuite comparison to tcwg_gnu.
- Submitted patch for separating build and test steps in tcwg_gnu.
== Next Week ==
- Continue ongoing tasks.
== Progress ==
* LLVM 9.0.0 rc1 binaries uploaded
- Ran into one cross-platform issue (x86, AArch64, ARM etc)
- Opened a bug for libfuzzer tests on AArch64
* Use ninja in release job [LLVM-536]
- Done
* Investigate running benchmarks in containers [TCWG-1513]
- Seems to work, except for mcf which errors out; will investigate next week
* IR SVE reviews [LLVM-545]
- Another round of feedback to D53137
== Plan ==
* Review D47770
* Upcoming vacation: 6 - 13 August
* Friday off
== Progress ==
* GCC:
- FDPIC: started taking feedback into account. Changes under test.
- noinit attribute: posted a new version
* GNU-583 (Fix Linux kernel built for Thumb-2 with GCC using LTO)
- no progress this week
* GCC upstream validation:
- no new issue this week.
* Binutils:
- Non-contiguous memory regions support in the BFD linker: not started
yet. Received a few "warnings" as feedback.
* misc:
- infra fixes / troubleshooting
== Next ==
GCC:
- handle feedback on FDPIC and noinit patches
- binutils/linker support for non-contiguous memory regions
- GNU-583
- GCC upstream validation: Add a config for cortex-m33 (v8-m)
== Holidays ==
Aug 2-11 (next week)
[PR42719] BasicAA UnitTest failure on AArch64 when compiled with GCC
- Patch submitted upstream
[PR42853] LLD support for TPREL_G0 relocations
- In theory a simple change, but llvm-mc seems to be deliberately
doing something strange with MOVZ encodings fixMOVZ and I haven't
worked out why it is needed.
Investigations with respect to inline assembler constraints.
- Some patch review comments for my ABE (Linaro GCC build system)
patch for GCC RM multilibs
- LLD review for smaller AArch64 images.
- Wrote a summary of what TCWG do for the upstream community, may turn
into a Linaro blogpost
- Raised GCC PR91299 to cover incorrect weak definition inlining in
GCC LTO in presence of non-weak definition.
On holiday Friday 2nd August, back in the office on Monday.
