- linaro-toolchain - lists.linaro.org

[ACTIVITY] 18-22 Nov 2019

by Christophe Lyon

== Progress == * GCC: - -mpure-code on v6m: sent an updated patch, waiting for approval. * BFD Linker: - non-contiguous memory support: partial prototype working on the use-case, but causes regressions. * GCC upstream validation: - reported several issues * misc: - infra fixes / troubleshooting / reviews == Next == * GCC: pure-code/v6m, handle feedback * Binutils: support non-contiguous memory regions in linker

5 years, 7 months

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[ACTIVITY] week ending Nov. 24 2019

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= Extend gdbstub for SVE ([VIRT-281]) - worked on [v2 rebase addressing comments] [VIRT-281] https://projects.linaro.org/browse/VIRT-281 [v2 rebase addressing comments] https://github.com/stsquad/qemu/tree/gdbstub/sve-registers-v2 Upstream Work ([VIRT-109]) ========================== - general poking around and stress testing on the run up to release - documented some outstanding issues [on the planning page] - posted {PULL for rc3 0/5} a few doc and testing tweaks Message-Id: <20191120105801.2735-1-alex.bennee(a)linaro.org> - posted {PATCH for 4.2 v1 0/3} some tests/vm fixes Message-Id: <20191122112231.18431-1-alex.bennee(a)linaro.org> [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [on the planning page] https://wiki.qemu.org/Planning/4.2 Other Activities ================ - finalising [draft of KVM Forum conference report] - will publish on Monday once Beata adds the last note [draft of KVM Forum conference report] https://collaborate.linaro.org/pages/resumedraft.action?draftId=128647720 Completed Reviews [3/3] ======================= {PATCH v2 0/6} Make the qemu_logfile handle thread safe. Message-Id: <20191115131040.2834-1-robert.foley(a)linaro.org> - CLOSING NOTE [2019-11-22 Fri 17:15] Ad of v3 this is ready to go, just awaiting the tree to open again Added: <2019-11-15 Fri> {PATCH v3 0/6} Make the qemu_logfile handle thread safe. Message-Id: <20191118211528.3221-1-robert.foley(a)linaro.org> {PATCH 0/6} Enable Travis builds on arm64, ppc64le and s390x Message-Id: <20191119170822.45649-1-thuth(a)redhat.com> Current Review Queue ==================== * {PATCH 0/1} tests/vm: Allow to set path to qemu-img Message-Id: <20191114134246.12073-1-wainersm(a)redhat.com> Added: <2019-11-14 Thu> * {PATCH v7 0/8} Acceptance test: Add "boot_linux" acceptance test Message-Id: <20191104151323.9883-1-crosa(a)redhat.com> Added: <2019-11-04 Mon> * {RFC 0/3} tests/vhost-user-fs-test: add vhost-user-fs test case Message-Id: <20191025100152.6638-1-stefanha(a)redhat.com> Added: <2019-10-25 Fri> * {PATCH v5 00/22} target/arm: Implement ARMv8.5-MemTag, system mode Message-Id: <20191011134744.2477-1-richard.henderson(a)linaro.org> Added: <2019-10-11 Fri> -- Alex Bennée

5 years, 7 months

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[ACTIVITY] Week ending 22nd November

by Peter Smith

[Morello] - LLD finished pre-review refactoring and splitting up into reviewable chunks - Implemented range-extension and interworking thunks to test interaction with aligning .text to comply with Cheri Concentrate - Answered some questions from Linaro tech-leads about Morello Plans - Rebase once CUCL merge has been completed and submit for review. Planned Absences: Christmas Holiday 16th December - 3rd January inclusive

5 years, 7 months

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[ACTIVITY] report week ending 22 Nov

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - code review: + Marc-Andre's series trying to get rid of QOM pointer properties + various minor bits for rc2 - unsuccessfully tried to work out why one of QEMU's test cases asserts on BSD hosts only - some time consumed by office-move thanks -- PMM

5 years, 7 months

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[ACTIVITY] 18 - 22 Nov 2019

by Diana Picus

== Progress == * Triaging check-lldb failures on AArch64 [LLVM-512] - Opened 4 bug reports - One of them got a lot of attention so I was asked to upload more logs/try various things - Still have a couple of test failures to look into * Morello - First contact with the team - Started looking at the internal docs - Trying to build the existing toolchain == Plan == * Figure out the current state of LLDB for Morello and what needs to be done * Continue triaging LLDB failures

5 years, 7 months

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Question about toolchain

by Saeed Jamali

Dear Linaro, Dear Linaro I'm using arm cortex A53 (mt6735 [part number]). But I do not know which tool-chain I have to use. I found your website https://www.linaro.org/downloads/ on internet. and my guess is aarch64-linux-gnu. can you please guide me through selecting a proper tool-chain. Regards, Saeed Djamali

5 years, 7 months

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[Activity] Nov 11th ~ Nov 15th 2019

by Luis Machado

# Progress # o Upstream GDB * More patch reviewing and answering questions. o GDB: * GNU-644 - [GDB, AArch64] gdb.base/step-over-syscalls.exp failures - Managed to track this down all the way to the aarch64 single-stepping infrastructure in the kernel. Created reproduction steps and sent an e-mail to linux-arm-kernel - Also noticed a difference in the order in which SIGCHLD's are delivered between x86_64 and aarch64. This confused GDB, which expects the ordering it sees on x86_64. Working on a fix. * Tweaked QEMU setup a little for SVE testing * GNU-645 - gdbserver is not using SVE register descriptions properly - Tracked down why gdbserver is not sending SVE register data back to GDB. Working on a fix. * GNU-170 - GDB BZ #21221 - gdb hangs while stepping an empty loop - On hold for now. # Plan # o GDB * GNU-644 - [GDB, AArch64] gdb.base/step-over-syscalls.exp failures - Continue working on a fix. * GNU-645 - gdbserver is not using SVE register descriptions properly - Continue working on a fix.

5 years, 7 months

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[ACTIVITY] week ending 17 Nov 2019

by Richard Henderson

[VIRT-262 # ARMv8.1-PAN Privileged Access Never] Started, based on VHE patch set due to mmu_idx reorg therein. Needs some minor re-work to handle Secure EL1. [VIRT-273 # ARMv8.2-ATS1E1, AT S1E1R and AT S1E1W instruction variants ] Started. [VIRT-327 # Richard's upstream QEMU work ] Some soft-freeze bug fixing of stuff that I broke this cycle. Some patch review. [Kernel] Posted v7 of the ARMv8.5-RNG patch set. There's some significant mis-communication going on between me and Mark Rutland; I have no idea what he wants at this point... [GCC] Committed the base asm-flags patch set. Posted a follow-up to un-break thumb1, and add tests for it. r~

5 years, 7 months

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[ACTIVITY] Week 46

by Yvan Roux

* One day off o LLVM: * Machine Outliner: - Identified issues with asm statements, working on a fix. o Misc * Various meetings and discussions.

5 years, 7 months

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[ACTIVITY] 11 - 15 Nov 2019

by Prathamesh Kulkarni

== This Week == * GCC - PR89007: Posted patch upstream. - GNU-583: Worked with Kugan, to reproduce LTO failure and verified his patch fixes it. - Bug 5479: Investigated with Maxim, most likely a glibc issue. * Validation: - Posted abe patch to add --gcc_patch_file option. == Next Week == - Continue ongoing tasks.

5 years, 7 months

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[ACTIVITY] 11-15 Nov 2019

by Christophe Lyon

Monday off == Progress == * GCC: - -mpure-code on v6m: answered questions about my patch. Almost OK * Linker: - started looking at implementing non-contiguous memory support * GCC upstream validation: - reported several issues * misc: - infra fixes / troubleshooting / reviews == Next == * GCC: pure-code/v6m, handle feedback * Binutils: support non-contiguous memory regions in linker

5 years, 7 months

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[ACTIVITY] Week ending 15th November 2019

by Peter Smith

[Morello] - Dynamic linking implementation complete and tests written based on GNU ld output. - Good progress on refactoring the work prior to breaking it down into reviewable chunks. Have got a good idea of what I'd like the implementation to look like. TODO: - Finish refactoring patches. - Rebase into reviewable patches. - Document the design decisions. - Test on more than just the examples in the toolchain. - Rebase on top of latest CUCL drop when merge is finished. [Other] LLVM-MC upstream review for the Linux Kernel.

5 years, 7 months

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[ACTIVITY] week ending Nov. 17 2019

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= QEMU plugin support ([VIRT-280]) - feature now merged in 4.2 - closed out a bunch of related JIRA cards - API version now merged and this card is closed Extend gdbstub for SVE ([VIRT-281]) - posted {RFC PATCH 00/11} gdbstub re-factor and SVE support Message-Id: <20191115173000.21891-1-alex.bennee(a)linaro.org> [VIRT-281] https://projects.linaro.org/browse/VIRT-281 [working prototype] https://github.com/stsquad/qemu/tree/gdbstub/sve-registers Upstream Work ([VIRT-109]) ========================== - posted {PULL 0/8} testing and tcg plugin api ver Message-Id: <CAFEAcA_9AwoTE9zaKbiF6DkpN+O8LaEKGOct-m5S3yvFBHGK1g(a)mail.gmail.com> - posted {PATCH for 4.2-rc2 v1 0/5} misc doc and testing fixes Message-Id: <20191113115952.775-1-alex.bennee(a)linaro.org> - posted {RFC PATCH} scripts/tap-driver: report "slow" tests (HACK) Message-Id: <20191113142101.30280-1-alex.bennee(a)linaro.org> Other Activities ================ - wrote [draft of KVM Forum conference report] [draft of KVM Forum conference report] https://collaborate.linaro.org/pages/resumedraft.action?draftId=128647720 Completed Reviews [5/5] ======================= {PATCH 0/2} replace sysconf(_SC_PAGESIZE) with qemu_real_host_page_size Message-Id: <20191015031350.4345-2-richardw.yang(a)linux.intel.com> {PATCH v2 0/4} arm/aspeed: Watchdog and SDRAM fixes Message-Id: <20191113005201.19005-1-joel(a)jms.id.au> {kvm-unit-test PATCH 0/5} Improvements for the Travis CI Message-Id: <20191113112649.14322-6-thuth(a)redhat.com> {PATCH} target/arm: Clean up arm_cpu_vq_map_next_smaller asserts Message-Id: <20191115131623.322-1-richard.henderson(a)linaro.org> {PATCH v1 0/5} Make the qemu_logfile handle thread safe. Message-Id: <20191112150105.2498-1-robert.foley(a)linaro.org> Current Review Queue ==================== * {PATCH v2 0/6} Make the qemu_logfile handle thread safe. Message-Id: <20191115131040.2834-1-robert.foley(a)linaro.org> Added: <2019-11-15 Fri> * {PATCH 0/1} tests/vm: Allow to set path to qemu-img Message-Id: <20191114134246.12073-1-wainersm(a)redhat.com> Added: <2019-11-14 Thu> * {PATCH v7 0/8} Acceptance test: Add "boot_linux" acceptance test Message-Id: <20191104151323.9883-1-crosa(a)redhat.com> Added: <2019-11-04 Mon> * {RFC 0/3} tests/vhost-user-fs-test: add vhost-user-fs test case Message-Id: <20191025100152.6638-1-stefanha(a)redhat.com> Added: <2019-10-25 Fri> -- Alex Bennée

5 years, 7 months

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[ACTIVITY] report week ending 15 Nov

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - wrote up first draft of requirements for the better CI setup for testing pull request merge builds (https://wiki.qemu.org/Requirements/GatingCI) - wrote up version of the QEMU Summit minutes that includes enough context to make sense to people who weren't present; plan to send to qemu-devel next Friday - got 4.2 rc1 out of the door; this release seems to be pleasantly quiet for a change. thanks -- PMM

5 years, 7 months

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[ACTIVITY] 11 - 15 November 2019

by Diana Picus

== Progress == * Committed SVE-related fix for InstCombine * Started triaging check-lldb failures on AArch64 [LLVM-512] - Committed a trivial fix for one of the tests - Still looking into the other failures * Received and setup laptop for Morello work - Awaiting further instructions == Plan == * Start working on Morello * Keep triaging check-lldb failures * If time permits, look into SVE asserts some more

5 years, 7 months

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[Activity] Oct 28th - Nov 6th 2019

by Luis Machado

# Progress # o Annual Review * Concluded o Upstream GDB * Patch reviews on gerrit and answering questions. * Fixed PR25124 - [ARM] regression: thumb-bx-pc.exp (https://sourceware.org/bugzilla/show_bug.cgi?id=25124) * Investigated an odd failure in gdb.base/step-over-syscall.exp and ended up finding some odd stepping behavior that may or may not be kernel related. Still investigating under GNU-644 (https://projects.linaro.org/browse/GNU-644) o GDB: * GNU-170 - GDB BZ #21221 - gdb hangs while stepping an empty loop - On hold for now. It would be nice to be able to use a NOP instead of a dummy label + jump. * Setup QEMU for running SVE bits and reproduced some SVE hiccups in gdbserver that Alex mentioned. * Misc discussions about SVE and the GDB implementation in general. # Plan # o Upstream GDB * More patch reviewing and answering questions. o GDB: * GNU-644 - [GDB, AArch64] gdb.base/step-over-syscalls.exp failures - Continue investigating * Tweak QEMU setup a little for SVE testing

5 years, 7 months

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ACTIVITY] 4-8 Nov 2019

by Christophe Lyon

== Progress == * GCC: - -mpure-code on v6m: no feedback yet * Linker: - started looking at implementing non-contiguous memory support * GCC upstream validation: - reported several issues * misc: - infra fixes / troubleshooting / reviews == Next == * GCC: pure-code/v6m, handle feedback * Binutils: support non-contiguous memory regions in linker

5 years, 7 months

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[ACTIVITY] week ending 10 Nov 2019

by Richard Henderson

[VIRT-263 # ARMv8.1-VHE Virtual Host Extensions ] Reworked the timer redirection. Now the EL2 and EL0 redirection is unified, which is a bit easier to understand. Still no joy working out where the unwanted interrupt is coming from. As far as I can tell everything is plumbed correctly... I'll shelve this until PMM is not swamped with release work. It must wait for 5.0 for merging anyway. [VIRT-327 # Richard's upstream QEMU work ] Assorted patch review. [Kernel] Posted two more rounds of ARMv8.5-RNG for review. Seems I'd misunderstood one of Mark's previous suggestions, and Ard changed his mind about how RNDR vs RNDRRS should be used in the context of the shared resource across host*CORES + virt*VCPUS. [GCC] Posted an implementation of asm-flag-output for AArch32+AArch64. I should have done this years ago. There are two potential users within the kernel, and one is access_ok() which has thousands of uses. (Oh, and RNG, which has like 3 uses. :-P) Reviewed some arm simd patches that caught my eye. r~

5 years, 7 months

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[ACTIVITY] week ending Nov. 10 2019

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= QEMU plugin support ([VIRT-280]) - feature now merged in 4.2 - closed out a bunch of related JIRA cards - posted {PATCH} tcg plugins: expose an API version concept Message-Id: <20191104131836.12566-1-alex.bennee(a)linaro.org> - requested by Peter before hardfreeze Extend gdbstub for SVE ([VIRT-281]) - got a [working prototype] - probably need a little core gdbstub re-factor before posting RFC [VIRT-281] https://projects.linaro.org/browse/VIRT-281 [working prototype] https://github.com/stsquad/qemu/tree/gdbstub/sve-registers Upstream Work ([VIRT-109]) ========================== - posted {PULL v3 00/15} testing updates Message-Id: <20191025193709.28783-1-alex.bennee(a)linaro.org> - had to drop NetBSD autobuild (again) [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [branch] https://github.com/stsquad/qemu/tree/testing/docker-multiarch-refactor [testing/next] https://github.com/stsquad/qemu/tree/testing/next Other Activities ================ - Presented at KVM Forum - went down well, made a number of contacts who are interested - A bunch of discussion on Hexagon - More detailed write-up to follow Completed Reviews [4/4] ======================= {PATCH 0/5} travis.yml improvements: Update libraries, build with arm64 Message-Id: <20191009170701.14756-1-thuth(a)redhat.com> - CLOSING NOTE [2019-10-18 Fri 19:04] Pulled some bits into testing/next Added: <2019-10-09 Wed> {PATCH} Semihost SYS_READC implementation (v4) Message-Id: <20191024224622.12371-1-keithp(a)keithp.com> {PATCH v2 0/4} target/arm: Support for Data Cache Clean up to PoP Message-Id: <CADSWDztHetgmbUOp4WyRAkR0daAG6kkwhUTcyKWiCTWHQ1XB=w(a)mail.gmail.com> {PATCH 0/4} Make the qemu_logfile handle thread safe. Message-Id: <20191107142613.2379-1-robert.foley(a)linaro.org> Absences ======== - KVM Forum Oct 29th-Nov 1st Current Review Queue ==================== * {PATCH v7 0/8} Acceptance test: Add "boot_linux" acceptance test Message-Id: <20191104151323.9883-1-crosa(a)redhat.com> Added: <2019-11-04 Mon> * {RFC 0/3} tests/vhost-user-fs-test: add vhost-user-fs test case Message-Id: <20191025100152.6638-1-stefanha(a)redhat.com> Added: <2019-10-25 Fri> * {PATCH v5 00/22} target/arm: Implement ARMv8.5-MemTag, system mode Message-Id: <20191011134744.2477-1-richard.henderson(a)linaro.org> Added: <2019-10-11 Fri> * {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

5 years, 7 months

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[ACTIVITY] 3x3 for week ending 8th November 2019

by Peter Smith

Morello - Started to document the LLD implementation. - Implemented CHERI concentrate alignment for the important sections. - Dynamic linking is feature complete, but not finished yet, still Todo: -- More test cases for the various different combinations. -- Refactor to clean up the implementation. -- Rebase all the patches to remove the false starts. -- Update the documentation I've just started as it is already out of date. -- Not looked at ifunc or TLS yet. llvm-mc Some review on MC patch to allow limited symbolic computation when evaluating .if

5 years, 7 months

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[ACTIVITY] report week ending 8 Nov (inc KVM Forum trip report)

by Peter Maydell

Progress / KVM Forum trip report: * As usual, we held the QEMU Summit at the same time as the forum; this is an hour-or-two invitation only meeting of the top 20 or so maintainers/submaintainers, discussing process and other project issues. A proper summary/writeup of the minutes will be posted to qemu-devel later, but IMHO this year the most interesting topics were: - Spreading the load of managing pull request merges; currently I do this with the aid of some hand-hacked scripts. To be able to spread this work among more people we need to replace that with a more maintained and standardized CI/testing setup. RedHat have agreed to provide some people to work on at least the initial setup part of this, and we got some consensus that the approach to take was to use Gitlab with some custom 'runners' to handle the 'build/test on aarch64/ppc/s390x/etc' parts. - We talked about the project's general stance on 'plugin' interfaces; which can be controversial both because they commit us to maintaining a stable API/ABI and because they have the potential to be used to work around the GPL (eg proprietary device models). We plan to write up some guidelines here (mostly just writing down the existing consensus). - We also talked (again) about our handling of security issues and CVEs. My impression is that there are some parts of this that people aren't hugely happy with but that nobody has the time/effort to try to improve things (eg better documentation/tracking of issues, more prompt upstream point releases with security fixes), so things are likely to stay about as they are now. * Interesting talks (videos are being uploaded to: https://www.youtube.com/channel/UCRCSQmAOh7yzgheq-emy1xA ): - 'The Hype Around the RISC-V Hypervisor' : the RISC-V architecture's hypervisor extension isn't completely finalized yet, but it's far enough advanced that KVM support and also QEMU emulation of it have been written. An amusing sign of the architecture's academic underpinnings is that this first version doesn't have any hardware acceleration of the interrupt controller, but does have full nested-virtualization support. - 'ZERO: Next Generation Virtualization Platform for Huawei Cloud': Huawei describe hardware for a cloud environment which offloads as much as possible of the hypervisor work to custom I/O cards and a custom silicon cloud-control device, in a general approach that's probably familiar to anybody who watched the Amazon Nitro presentation from the other year. - 'What's Going On? Taking Advantage of TCG's Total System Awareness': Alex Bennée's talk on the introspection plugin work we've been doing in Linaro (and which will be in QEMU 4.2). - 'Playing Lego with Virtualization Components': description of the Rust 'rust-vmm' set of libraries intended to provide useful building blocks for putting together virtual machine managers (like Firecracker, crosvm). Basically similar content to a presentation they did for Cambridge University earlier this year, but this talk's been recorded so is good if you weren't in the audience the first time around. * And as always the in-person networking is valuable: - Oracle have a "split device emulation into separate processes" idea that's alarmingly invasive of the source code, but Stefan came up with an approach that might let them do what they need without making the source code harder to work with for the rest of us. - Met the RedHat person who's going to do the CI-for-pullreqs work (see QEMU Summit item earlier) : getting this unstalled was probably the most useful concrete outcome of the conference - Finally met Aurelien Jarno (a longstanding hobbyist contributor to QEMU who usually can't attend these conferences) * While at the conference Drew and I managed to finally get the SVE support for KVM guests into master (the last hurdle was an awkward test failure on the aarch32-compat-on-aarch64-kernel setup I happen to use as one of my build test environments; we don't care about whether KVM really works in this setup but we need 'make check' to not fail) * Also managed to fit in some wrangling of pull requests; the timing of the 4.2 release unfortunately put softfreeze on the Tuesday before the conference and rc0 on the Tuesday afterwards; rc0 ended up being postponed a couple of days as a consequence. thanks -- PMM

5 years, 7 months

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[ACTIVITY] Week ending 1st November 2019

by Peter Smith

Linaro - On buildbot monitoring duty, relatively quiet week with just a couple of fairly simple to diagnose problems to report. Morello - Dynamic linking progressing albeit slowly. -- Trying to work out the requirements from existing documents and implementation. -- Have some simple cases doing mostly the right thing and have written some tests. -- Will need to rewrite to move calculations earlier in the link-step. -- Morello is quite different from Cheri in this regard so I have had to diverge much more from the implementation.

5 years, 7 months

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VHE status

by Richard Henderson

Tree: https://github.com/rth7680/qemu.git tgt-arm-vhe-5 Testcase: qemu-test:~rth/linux/initramfs-min.cpio.gz The host kernel could be anything, but I've been using the same Image.gz that is inside the cpio archive. ./aarch64-softmmu/qemu-system-aarch64 -m 4G \ -M virt,virtualization=on,gic-version=max -cpu max \ -kernel Image.gz -initrd initramfs-min.cpio.gz At the shell prompt, ./test will run a guest kernel with kvm. As momentarily discussed with PMM in the hallway: As soon as the guest kernel enables interrupts, arch_timer_starting_cpu enable_percpu_irq irq_percpu_enable gic_unmask_irq -- Incorrect exception delivery. the GTIMER_PHYS interrupt is delivered to EL2 (seems to be ok), the host kernel does something (haven't dug into what exactly, bug presumably setting bits that are supposed to pass the virq to the guest), and immediately another interrupt is delivered to EL2. Repeat. Whether this is incorrect routing of the virq interrupt, or incorrect masking/acking of the hard irq interrupt at EL2, I do not yet know. PMM: I don't know the answer to either (a) or (b) as asked on hangouts. I think (b) is correct, but I can't be sure. I'm trying to understand how (a) is supposed to work now. In particular, I can't find any code that sets HCR_EL2.{VI,VF}, only tests them. r~

5 years, 7 months

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[Activity] 21 - 25 Oct 2019

by Luis Machado

# Progress # o Ramp up * Concluded. o Annual Review * Attended discussions. o Upstream GDB * Patch reviews on gerrit. * Answered questions. * The state of ARM/AArch64 GDB upstream seems to be reasonable, with a few failures here and there. Numerous failures on problematic racy tests (gdb.threads). o GDB: * GNU-170 - GDB BZ #21221 - gdb hangs while stepping an empty loop - Spent some more time on this and improve the patch further, covering most problematic cases for "for", "while" and "do/while" loops. * Read some documentation on setting up Fast Models for testing MVE (Helium). * Inspected various aspects of ARM support in GDB, like SVE, PAC and ACLE. # Plan # o Annual Review * Conclude. o GDB: * GNU-170 - GDB BZ #21221 - gdb hangs while stepping an empty loop - Discuss with gcc@ a bit more about my proposed solution. * Attempt to setup system QEMU and/or Fast Model for testing ACLE SVE and, maybe, MVE.

5 years, 7 months

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[ACTIVITY] 21 - 25 October 2019

by Diana Picus

== Progress == * Out of office 1 day * Buildbot monitoring - Moved the buildbots to pull from github * Trying to setup a build environment on ex40-01 - Gave up on the tcwg-sq-01/2 boards because they seemed too unstable * Still no access to Morello docs * Playing with lldb python scripting - Got a script that intercepts all calls to VectorType::getNumElements that don't come from a getElementCount (since that likely means that they won't be preserving the 'scalable' property) - This should help figure out problems spotted by the fuzzer - Likely needs a bit more refining == Plan == * More of the same * Out of office on Friday (1 November)

5 years, 7 months

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[ACTIVITY] 21 - 25 Oct 2019

by Prathamesh Kulkarni

== This Week == * GCC - PR91272: Addressing upstream suggestions. - PR92163: Addressing upstream suggestions. * Validation - CI monitoring * Misc - Meetings == Next Week == - GCC: Continue ongoing tasks

5 years, 8 months

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[ACTIVITY] week ending Oct. 27 2019

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= QEMU plugin support ([VIRT-280]) - posted {PULL v2 00/73} tcg plugins and testing updates Message-Id: <20191025063713.23374-1-alex.bennee(a)linaro.org> - ended up having to pull due to testing breakage, will send re-split on Monday [VIRT-280] https://projects.linaro.org/browse/VIRT-280 Upstream Work ([VIRT-109]) ========================== - posted {PATCH for 4.2 v1 00/19} testing/next before softfreeze Message-Id: <20191022191704.6134-1-alex.bennee(a)linaro.org> - posted {PULL v3 00/15} testing updates Message-Id: <20191025193709.28783-1-alex.bennee(a)linaro.org> - had to drop NetBSD autobuild (again) [VIRT-109] https://projects.linaro.org/browse/VIRT-109 Other Activities ================ - KVM Forum Presentation work - Meeting with members on VirtIO options in custom hypervisors - Follow up on potential QEMU improvements for FW Completed Reviews [2/2] ======================= {PATCH 0/5} travis.yml improvements: Update libraries, build with arm64 Message-Id: <20191009170701.14756-1-thuth(a)redhat.com> - CLOSING NOTE [2019-10-18 Fri 19:04] Pulled some bits into testing/next Added: <2019-10-09 Wed> {PATCH} Semihost SYS_READC implementation (v4) Message-Id: <20191024224622.12371-1-keithp(a)keithp.com> Absences ======== - KVM Forum Oct 29th-Nov 1st Current Review Queue ==================== * {RFC 0/3} tests/vhost-user-fs-test: add vhost-user-fs test case Message-Id: <20191025100152.6638-1-stefanha(a)redhat.com> Added: <2019-10-25 Fri> * {PATCH v5 00/22} target/arm: Implement ARMv8.5-MemTag, system mode Message-Id: <20191011134744.2477-1-richard.henderson(a)linaro.org> Added: <2019-10-11 Fri> * {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> * {PATCH v5 00/73} per-CPU locks Message-Id: <20181213050453.9677-1-cota(a)braap.org> * {PATCH 00/35} exec: drop BQL from interrupt handling -- Alex Bennée

5 years, 8 months

1
0
0 0

[ACTIVITY] 21-25 Oct 2019

by Christophe Lyon

== Progress == * GCC: - -mpure-code on v6m: no feedback yet * FDPIC/GDB - problems with the board I used, it hangs shortly after or during boot. None of the workaround/fixes suggested to me worked. Having an stm32 qemu config would help. * GCC upstream validation: - reported several issues * misc: - infra fixes / troubleshooting / reviews - sent 2 small qemu patches (fix vmrs support for m-profile, and add cortex-m7) - confirmed that gcc LTO profiled bootstrap works on arm with recent trunk, although it takes ages. Will need to try on a more powerful board == Next == * Holidays next week, back Nov 4th * FDPIC: resume work on GDB: check the various qemu forks with stm32 board support. Add FDPIC configuration in the GCC trunk validation. * GCC: pure-code/v6m, handle feedback * Binutils: support non-contiguous memory regions in linker

5 years, 8 months

1
0
0 0

[ACTIVITY] report week ending 25 Oct

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] + lots of wrangling of patches and pulls since I'm away next week and it's also going to be softfreeze + preparation for KVM Forum next week thanks -- PMM

5 years, 8 months

1
0
0 0

[ACTIVITY] week ending 20 Oct 2019

by Richard Henderson

Progress: [VIRT-344 # ARMv8.5-MemTag, Memory Tagging Extension ] Updates for user-only. Merge bug fixes from eugeni.stepanov(a)gmail.com. [VIRT-349 # QEMU SVE2 Supprt ] Convert neon pmul helpers to a form that will be usable for sve2. [VIRT-327 # Richard's upstream QEMU work ] Pull for tcg-next. Review plugins v5. Update for capstone submodule. Started reviewing multi-phase reset v5. [Kernel] Hacked up a patch for ARMv8.5-RNG. r~

5 years, 8 months

1
0
0 0

[ACTIVITY] 14 - 18 Oct 2019

by Prathamesh Kulkarni

== This Week == * GCC SVE: - PR91532: Added test to PR91532 fix. - PR92085: Fix committed to trunk. - PR86753: Fix committed to trunk. - PR91272: Addressing upstream suggestions. - PR92033: Proposed patch, but Richard had a better approach. - PR89007: WIP. * Validation - Merged https://review.linaro.org/c/toolchain/jenkins-scripts/+/33041 * Misc: - Meetings - Annual Review == Next Week == - GCC SVE: Continue ongoing tasks. - Validation: Investigate issues with LTO bootstraps.

5 years, 8 months

1
0
0 0

[ACTIVITY] week ending Oct. 20 2019

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= QEMU plugin support ([VIRT-280]) - posted {PATCH for 4.2 v5 00/55} Support for TCG plugins Message-Id: <20191014104948.4291-1-alex.bennee(a)linaro.org> - posted {PATCH for 4.2 v6 00/54} Support for TCG plugins Message-Id: <20191017131615.19660-1-alex.bennee(a)linaro.org> - should hopefully send PR next week - minor clean-up patch suggested by pm [VIRT-280] https://projects.linaro.org/browse/VIRT-280 Upstream Work ([VIRT-109]) ========================== - more work on multiarch docker [branch] - gathered up patches for [testing/next] [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [branch] https://github.com/stsquad/qemu/tree/testing/docker-multiarch-refactor [testing/next] https://github.com/stsquad/qemu/tree/testing/next Other Activities ================ - Annual Review - Background reading on VirtIO Completed Reviews [3/3] ======================= {PATCH v6 00/20} target/arm: Reduce overhead of cpu_get_tb_cpu_state Message-Id: <20191011155546.14342-1-richard.henderson(a)linaro.org> - CLOSING NOTE [2019-10-17 Thu 14:17] Looking good Added: <2019-10-11 Fri> {PATCH 0/4} target/arm vector improvements Message-Id: <20191017044232.27601-1-richard.henderson(a)linaro.org> {PATCH 0/5} travis.yml improvements: Update libraries, build with arm64 Message-Id: <20191009170701.14756-1-thuth(a)redhat.com> - CLOSING NOTE [2019-10-18 Fri 19:04] Pulled some bits into testing/next Added: <2019-10-09 Wed> Absences ======== - KVM Forum Oct 29th-Nov 1st Current Review Queue ==================== * {PATCH v5 00/22} target/arm: Implement ARMv8.5-MemTag, system mode Message-Id: <20191011134744.2477-1-richard.henderson(a)linaro.org> Added: <2019-10-11 Fri> * {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> * {PATCH v5 00/73} per-CPU locks Message-Id: <20181213050453.9677-1-cota(a)braap.org> * {PATCH 00/35} exec: drop BQL from interrupt handling Message-Id: <20180917163103.6113-1-cota(a)braap.org> * {Qemu-arm} {PATCH v5} target-arm: Make the counter tick relative to cntfrq Message-Id: <20190912065631.12473-1-andrew(a)aj.id.au> -- Alex Bennée

5 years, 8 months

1
0
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[Activity] Week 41

by Luis Machado

# Progress # o Ramp up * Credentials, machine access and LDAP updates done. o Qualcomm Landing Team sunsetting * Returned Qualcomm's Laptop. o Upstream GDB * Ramping up on reviews. * Gathering data on the current state of GDB on ARM. o GDB: * GNU-170 - GDB BZ #21221 - gdb hangs while stepping an empty loop - Came up with a little hack/proof-of-concept to get this fixed. Though ugly, it seems fixing this in the front-end may make more sense, as the information i need (source line) is easily accessible in there. - Discussion ongoing with gcc@. GDB clearly needs the compiler to provide more information. * Created JIRA cards for all known pending ARM tasks for GDB, based on Alan's and Joey's input. TODO-ed all of them for the time being. # Plan # o GDB: * GNU-170 - GDB BZ #21221 - gdb hangs while stepping an empty loop - Continue pursuing a fix. * Prioritize GDB JIRA cards and start work on them.

5 years, 8 months

1
0
0 0

[ACTIVITY] 3x3 for week ending 18th October 2019

by Peter Smith

[Morello] - Got static linking support to the point that I can successfully link with LLD the coremark, dhrystone and EEMBC from the arran-toolchain. Not got any outstanding failures to investigate. - Altered LLD so a linker script is no longer necessary for newlib. - Started the process of rebasing and adding tests for all the fixes/hacks I needed to make to the linker work. - Aligned the base and limit of capabilities according to the incoming CHERI concentrate scheme. Interesting question of what should a linker do when alignment requirements on the base and limit cross section boundaries, and what are the responsibilities for an object producer when creating a section when the length of the capability is known at compile time. Planned absences: Holiday Thursday, Friday (24th, 25th October)

5 years, 8 months

1
0
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[ACTIVITY] report week ending 18 Oct

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] + finishing off the ptimer API transition work + review of rth's "speed up calculation of tbflags" patchset + put together and sent an arm pullreq * VIRT-350 [Update Arm KVM support in QEMU] + the patchset for hotpluggable RAM support is now upstream thanks -- PMM

5 years, 8 months

1
0
0 0

[ACTIVITY] 14-18 Oct 2019

by Christophe Lyon

== Progress == * GCC: - Work on -mpure-code on v6m. Patches sent for upstream review. * GCC upstream validation: - reported several issues * misc: - infra fixes / troubleshooting / reviews == Next == * FDPIC: resume work on GDB * GCC: pure-code/v6m * Binutils: support non-contiguous memory regions in linker

5 years, 8 months

1
0
0 0

[ACTIVITY] 14 - 18 October 2019

by Diana Picus

== 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

5 years, 8 months

1
0
0 0

[ACTIVITY] Week 41

by Yvan Roux

* 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.

5 years, 8 months

1
0
0 0

[ACTIVITY] 7-11 Oct 2019

by Christophe Lyon

== 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

5 years, 8 months

1
0
0 0

[ACTIVITY] week ending 13 Oct 2019

by Richard Henderson

[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~

5 years, 8 months

1
0
0 0

[ACTIVITY] week ending Oct. 13 2019

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= QEMU plugin support ([VIRT-280]) - final touches on the [v5 branch] - rth helped with debugging some crashes exposed by alpha - will post on Monday [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]) - posted {PATCH v9 00/13} TCG code quality tracking and perf integration Message-Id: <20191007152839.30804-1-alex.bennee(a)linaro.org> ARMv8.5-MemTag ([VIRT-344]) =========================== - spent some time debugging with rth [VIRT-344] https://projects.linaro.org/browse/VIRT-344 Upstream Work ([VIRT-109]) ========================== - started prototyping multiarch docker on qemu-test [VIRT-109] https://projects.linaro.org/browse/VIRT-109 Other Activities ================ - Finally got KVM Forum travel booked - Spent time on Annual Review Completed Reviews [5/5] ======================= {Qemu-devel} {PATCH 0/4} target/arm: Support for Data Cache Clean up to PoP Message-Id: <20190910095610.4546-1-beata.michalska(a)linaro.org> - CLOSING NOTE [2019-10-11 Fri 20:29] Actually done at Connect Added: <2019-09-23 Mon> {PATCH RFC} docker: automatic dependencies for dockerfiles Message-Id: <20190920001823.23279-1-jsnow(a)redhat.com> - CLOSING NOTE [2019-10-07 Mon 17:15] Bit of a hack, need to take another crack at multiarch Added: <2019-09-24 Tue> {PATCH v2 00/15} target/arm: Implement semihosting v2.0 Message-Id: <20190916141544.17540-1-peter.maydell(a)linaro.org> - CLOSING NOTE [2019-10-07 Mon 17:15] Others have looked at it. Added: <2019-10-03 Thu> {PATCH 00/19} hw/arm/raspi: Improve Raspberry Pi 2/3 reliability Message-Id: <20190926173428.10713-11-f4bug(a)amsat.org> {Qemu-devel} {PATCH 0/6} exec: Cleanup watchpoints Message-Id: <20190824213451.31118-1-richard.henderson(a)linaro.org> - CLOSING NOTE [2019-10-11 Fri 20:30] Already merged Absences ======== - KVM Forum Oct 29th-Nov 1st Current Review Queue ==================== * {PATCH v6 00/20} target/arm: Reduce overhead of cpu_get_tb_cpu_state Message-Id: <20191011155546.14342-1-richard.henderson(a)linaro.org> Added: <2019-10-11 Fri> * {PATCH v5 00/22} target/arm: Implement ARMv8.5-MemTag, system mode Message-Id: <20191011134744.2477-1-richard.henderson(a)linaro.org> Added: <2019-10-11 Fri> * {PATCH 0/5} travis.yml improvements: Update libraries, build with arm64 Message-Id: <20191009170701.14756-1-thuth(a)redhat.com> Added: <2019-10-09 Wed> * {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

5 years, 8 months

1
0
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[ACTIVITY] 7 - 11 October 2019

by Diana Picus

== 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]

5 years, 8 months

1
0
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[ACTIVITY] week ending 6 Oct 2019

by Richard Henderson

[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~

5 years, 8 months

1
0
0 0

[ACTIVITY] 30 Sept-4 Oct 2019

by Christophe Lyon

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

5 years, 8 months

1
0
0 0

[ACTIVITY] week ending Oct. 6 2019

by Alex Bennée

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

5 years, 8 months

1
0
0 0

[ACTIVITY] week ending 4th October 2019

by Peter Smith

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.

5 years, 8 months

1
0
0 0

[ACTIVITY] report week ending 4 Oct

by Peter Maydell

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

5 years, 8 months

1
0
0 0

[ACTIVITY] 1 - 4 October 2019

by Diana Picus

== 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

5 years, 8 months

1
0
0 0

[ACTIVITY] Week 39

by Yvan Roux

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.

5 years, 8 months

1
0
0 0

[ACTIVITY] report week ending 27 Sep

by Peter Maydell

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

5 years, 8 months

1
0
0 0

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