- linaro-toolchain - lists.linaro.org

[ACTIVITY] week ending 2 Nov 2018

by Richard Henderson

[VIRT-241 # QEMU ARMv8.3 support ] Finished filling out the sub-tasks for v8.3. Added some implementation notes to some of those tasks as I reread the relevant documentation. [VIRT-246 # ARMv8.1-LOR Limited Ordering Regions ] Posted a trivial implementation. [VIRT-247 # ARMv8.1-HPD and ARMv8.2-AA32HPD ] Posted. [Upstream] Dirty tlb patches and decodetree changes squeeked in for softfreeze. Another round of tlb flush reduction for aa64. This time exposing asid's to the softmmu core and allowing it to flush when necessary. Some more work toward moving x86 softmmu load sequences out of line. The bulk of the code for 32-bit is now written, but it doesn't work yet. Fix my thinko wrt divdeu and power7. [GCC] The cleanup part of my atomics patch set has been approved and committed. Posted v3 of the out-of-line atomics part as well. r~

6 years, 9 months

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[ACTIVITY] week ending Nov. 4 2018

by Alex Bennée

Upstream Work ([VIRT-109]) ========================== - reviewed {Qemu-arm} {RFC v4 00/71} per-CPU locks Message-Id: <20181025151103.GA19931@flamenco> - this is a precursor to Emilio's {RFC 00/48} Plugin support Message-Id: <20181025172057.20414-1-cota(a)braap.org> [VIRT-109] https://projects.linaro.org/browse/VIRT-109 QEMU Tooling ([VIRT-252]) ========================= [VIRT-252] https://projects.linaro.org/browse/VIRT-252 QEMU plugin support ([VIRT-280]) - go through Emilio's {RFC 00/48} Plugin support Message-Id: <20181025172057.20414-1-cota(a)braap.org> :todo - port my example tools to his framework [VIRT-280] https://projects.linaro.org/browse/VIRT-280 Kernel Debug via gdbstub - started re-spin of [KVM/QEMU guest debug fix] - reviewed/tested problem fixed by {Qemu-devel} {PATCH 0/5} target/arm: KVM vs ARMISARegisters Message-Id: <20181024113709.16599-1-richard.henderson(a)linaro.org> - found a weird bug w.r.t single-stepping first instruction - started down the debugging rabbit hole [KVM/QEMU guest debug fix] https://github.com/stsquad/qemu/tree/kvm/fix-breakpoints-v2 Other Tasks =========== - Wrote up [KVM Forum 2018 report] - started looking at {RFC PATCH v2 00/23} KVM: arm64: Initial support for SVE guests Message-Id: <1538141967-15375-1-git-send-email-Dave.Martin(a)arm.com> [KVM Forum 2018 report] https://collaborate.linaro.org/display/CR/20181024+KVM+Forum+2018 Completed Reviews [2/2] ======================= {PATCH v2 0/3} Modern shell scripting (use $() instead of ``) Message-Id: <20181018031723.23459-1-maozhongyi(a)cmss.chinamobile.com> - CLOSING NOTE [2018-10-31 Wed 15:37] The bit that touched bootstrap was fine {Qemu-arm} {RFC v4 00/71} per-CPU locks Message-Id: <20181025151103.GA19931@flamenco> - CLOSING NOTE [2018-10-31 Wed 16:58] Looks good, needs a minor tweak for linux-user mode. Will check final patches on the next iteration. Absences ======== - Christmas Holidays - Connect BKK19 (1-5th April 2019) Current Review Queue ==================== * {RFC 00/48} Plugin support Message-Id: <20181025172057.20414-1-cota(a)braap.org> * {RFC PATCH v2 00/23} KVM: arm64: Initial support for SVE guests Message-Id: <1538141967-15375-1-git-send-email-Dave.Martin(a)arm.com> * {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> * {PATCH v7 00/19} Fixing record/replay and adding reverse debugging Message-Id: <20181010133333.24538.53169.stgit@pasha-VirtualBox> * {PATCH v2 0/3} Bootstrap Python venv and acceptance/functional tests Message-Id: <20181009041826.19462-1-crosa(a)redhat.com> * {Qemu-arm} {PATCH 00/13} target/arm: Implement v8M stack limit checks Message-Id: <20181002163556.10279-1-peter.maydell(a)linaro.org> -- Alex Bennée

6 years, 9 months

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[ACTIVITY] report week ending 2 Nov

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - code review - target-arm pull requests - lots of pull request processing (softfreeze was this week) - investigated and sent patches to fix a bug where a PC related pullrequest was failing tests on my merge test setup (turned out to be a build system issue where we were doing things in configure that meant make didn't notice it needed to rerun it) - some simple patches for coverity issues thanks -- PMM

6 years, 9 months

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[ACTIVITY] Week ending November 2nd 2018

by Peter Smith

[LLVM-203] Code-Size investigation with PGO - Finished up the remain tasks and resolved the ticket. - Tidied up the patches and added tests so that I can potentially share them with other interested parties. -- Writing tests took a lot longer than I thought as it involves faking a profile and there were quite a few caveats to doing that. Some prototyping in LLVM and LLD for some internal ABI discussions.

6 years, 9 months

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[ACTIVITY] October 29-November 2 2018

by Christophe Lyon

* 1 day off == Progress == * FDPIC - Cortex-M fix for binutils committed. uClibc-ng patch on-going - GCC: handling feedback on v3 patches. Trying to build/check xtensa uclinux toolchain to check my patches do not affect it. No satisfactory reference build yet. * GCC upstream validation: - reported a few regressions - one of last week's regressions is causing timeouts on some validations, thus delaying the full queue. I haven't isolated the cause yet - dealing with some random results, again * GCC: - bug report on aarch64 about misaligned accesses. Waiting for more details to reproduce the problem. * misc (conf-calls, meetings, emails, ....) - Benchmarking harness hopefully fixed - reviewing infra script patches - bugzilla cleanup == Next == FDPIC: - GCC: followup v3 patches - uclibc-ng: look at how to test fdpic mode with openadk - use qemu-system mode to run more tests Benchmarking: - fix harness until they support gcc-8

6 years, 9 months

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[ACTIVITY] Weekly report for week 43

by Thomas Preudhomme

=== Work done during this past week === * GNU-296 / GCC PR85434 / CVE-2018-12886: upstream review + avoid useless cmp after eors + fix another missing earlyclobber + full Thumb-1, Thumb-2 and Arm bootstrap with testing with and without -fPIC, with and without -fstack-protector-all * Continue patch to further update cpus and architectures in bfd: external review + also teach GAS about Armv5TEJ and newer wrt. bfd architectures tags + fix ld action in run_dump_test + add testing for all this and submit for external review * Resurrect code size optimization for fmul/dmul from Tony Wang: + rebase on trunk * Line management === Plan for week 43 === * LLVM-432 (Support arithmetic on FileCheck regex variable): + extend testcase coverage (add tests for latest syntax change and add more negative testing) + finish cleaning up the code * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management

6 years, 9 months

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[ACTIVITY] report week ending 26 Oct

by Peter Maydell

Progress: * Attended OSS Europe/KVM Forum - as usual, a good week (helpful conversations, interesting sessions) - full conference writeup later in the week thanks -- PMM

6 years, 9 months

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[ACTIVITY] Week ending 28 Oct 2018

by Richard Henderson

[VIRT-198 # QEMU: SVE Emulation Support ] Last of the patches merged to mainline. Epic is now closed. [VIRT-282 # QEMU: Accelerate TCG with KVM ] A hallway talk with Paolo lead to a write-up, and Alex encouraged me to create the epic. The epic description contains a link to the write-up, if anyone is interested. I'd like to at least create a vm, measure some round-trip costs, and properly gauge the level of difficulty. Beyond that... we'll see. [Upstream] Patch review: - risc-v decodetree patches v2. Produced some patches against decodetree itself in response. I'm hopeful to see a much cleaner v3. - per-cpu locks [KVM Forum] - Unsurprisingly, lots of people worked on speculation mitigation this year. - Lots of focus on "ram", and the allocation and management thereof. - Four talks on improving nested virtualization. - The rest to follow in the trip report. r~

6 years, 9 months

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[ACTIVITY] 22-26 October 2018

by Christophe Lyon

== Progress == * FDPIC - Posted binutils and uClibc-ng patches to fix cortex-M support, under discussion - GCC: handling feedback on v3 patches. Experimented thumb-1 builds, failed. * GCC upstream validation: - reported a few regressions - dealing with some random results, again * GCC: - bug report on aarch64 about misaligned accesses. Waiting for more details to reproduce the problem. * misc (conf-calls, meetings, emails, ....) - Working on fixes of our benchmarking harness to support new gcc-8 releases. == Next == FDPIC: - GCC: followup v3 patches - uclibc-ng: look at how to test fdpic mode with openadk - use qemu-system mode to run more tests Benchmarking: - fix harness until they support gcc-8

6 years, 9 months

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[ACTIVITY] 22 - 26 October 2018

by Prathamesh Kulkarni

== This Week == * GNU-405: Implement division using vrecpe / vrecps (4/10) - Patch validated and posted upstream. * SVE ACLE intrinsics (4/10) - Going thru documentation. * GNU-235: Provide value-range info for erf family of functions (1/10) - Working on patch. * Misc (1/10) - Meetings == Next Week == - Continue GNU-235, SVE ACLE intrinsics

6 years, 10 months

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[ACTIVITY] week ending Oct. 28 2018

by Alex Bennée

Upstream Work ([VIRT-109]) ========================== - started looking at {Qemu-arm} {RFC v4 00/71} per-CPU locks Message-Id: <20181025151103.GA19931@flamenco> - this is a precursor to Emilio's {RFC 00/48} Plugin support Message-Id: <20181025172057.20414-1-cota(a)braap.org> [VIRT-109] https://projects.linaro.org/browse/VIRT-109 Other Tasks =========== - Attended KVM Forum 2018 - I am now Spectre'd out ;-) - Some interesting discussions on upstream CI - will save the rest of my notes for the conference report - Delivered QEMU Keynote/Status report @ KVM Forum 2018 - Here are [the slides] [the slides] http://people.linaro.org/~alex.bennee/org/presentations/kvm18-qemu-keynote.… Current Review Queue ==================== * {Qemu-arm} {RFC v4 00/71} per-CPU locks Message-Id: <20181025151103.GA19931@flamenco> * {RFC 00/48} Plugin support Message-Id: <20181025172057.20414-1-cota(a)braap.org> * {PATCH v2 0/3} Modern shell scripting (use $() instead of ``) Message-Id: <20181018031723.23459-1-maozhongyi(a)cmss.chinamobile.com> * {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> * {PATCH v7 00/19} Fixing record/replay and adding reverse debugging Message-Id: <20181010133333.24538.53169.stgit@pasha-VirtualBox> * {PATCH v2 0/3} Bootstrap Python venv and acceptance/functional tests Message-Id: <20181009041826.19462-1-crosa(a)redhat.com> -- Alex Bennée

6 years, 10 months

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[ACTIVITY] Week ending 26th October 2018

by Peter Smith

[LLVM-203] Investigation into profiling and code-size optimizations - Collected the remaining data I needed over the weekend. - Wrote up report - Rebased patches on tip of trunk - Attached results and report to Jira issue. - A one line summary of the results is that if you are lucky you can get close to peak performance at close to Os code size if your program happens to spend most of its time in a few small places. If you are unlucky then increased inlining and unrolling can still result in an overall code size increase over -O3 but the effect will be limited. [LLVM-158] Monitor and maintain buildbots - Relatively quiet week, a couple of patches pinged for fixes/reverts.

6 years, 10 months

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[ACTIVITY] 15 - 19 October 2018

by Prathamesh Kulkarni

== This Week == * TCWG-1234: Coremark regression (7/10) - Fixed golang regressions with the patch. - Posted patch upstream to change hoisting order and apply cost model. * Public holiday (2/10) * Misc (1/10) - Meetings == Next Week == - TCWG-319, SVE

6 years, 10 months

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[ACTIVITY] week ending 21 Oct 2018

by Richard Henderson

[VIRT-214 # SVE System Registers ] v4 posted and merged to target-arm.next; will be in master shortly. That will complete basic SVE system mode support. [UPSTREAM] tcg-next patches collected and flushed. Dug into apparently excessive overhead in aarch64 guest tlb flushing, noticed by chance while doing something else. Two patches upstream, several more written but need cleanup. Total overhead down from 25% to 9%. r~

6 years, 10 months

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[ACTIVITY] week ending Oct. 21 2018

by Alex Bennée

Upstream Work ([VIRT-109]) ========================== - started looking at {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> - sent {PATCH} .travis.yml: split MacOSX builds and reduce target list Message-Id: <20181008152059.17503-1-alex.bennee(a)linaro.org> - various single patch reviews [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [this patch] https://github.com/stsquad/qemu/commit/db0504154ef1feedd135f25f8ca6e9abb5d0… Other Tasks =========== - Finished writing QEMU Keynote/Status report for KVM Forum 2018 Absences ======== - Travel (22nd/23rd) - KVM Forum 2018 (24th-26th October 2018) Current Review Queue ==================== * {Qemu-arm} {RFC v3 0/56} per-CPU locks Message-Id: <20181019010625.25294-1-cota(a)braap.org> * {PATCH v2 0/3} Modern shell scripting (use $() instead of ``) Message-Id: <20181018031723.23459-1-maozhongyi(a)cmss.chinamobile.com> * {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> * {PATCH v7 00/19} Fixing record/replay and adding reverse debugging Message-Id: <20181010133333.24538.53169.stgit@pasha-VirtualBox> * {PATCH v2 0/3} Bootstrap Python venv and acceptance/functional tests Message-Id: <20181009041826.19462-1-crosa(a)redhat.com> * {Qemu-arm} {PATCH 00/13} target/arm: Implement v8M stack limit checks Message-Id: <20181002163556.10279-1-peter.maydell(a)linaro.org> -- Alex Bennée

6 years, 10 months

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[ACTIVITY] Weekly report for week 42

by Thomas Preudhomme

=== Work done during this past week === * GNU-296 / GCC PR85434 / CVE-2018-12886: + few more issues fixed and associated testing + now also running Thumb-1 bootstrap and testing * Prepare patch to further update cpus and architectures in bfd * Line management === Plan for week 43 === * GNU-296 / GCC PR85434 / CVE-2018-12886: + finish testing, and submit new stack protector patch for upstream review * LLVM-432 (Support arithmetic on FileCheck regex variable): + extend testcase coverage (add tests for latest syntax change and add more negative testing) + finish cleaning up the code * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management

6 years, 10 months

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[ACTIVITY] report week ending 19 Oct

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - code review - use ID registers as master source for "should this CPU have this feature" information (rth) - clean up 32-bit Neon to use vector infrastructure (rth) - don't let the kernel get loaded on top of our builtin bootloader if it happens to ask for a zero text offset - Xilinx Versal board patches - target-arm pull requests - some minor patches to fix new clang warnings - preparation for KVM Forum/QEMU Summit etc next week thanks -- PMM

6 years, 10 months

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[ACTIVITY] 15-19 October 2018

by Christophe Lyon

== Progress == * FDPIC - GCC: handled feedback on v3 patches. Not much info on how to test other existing uclinux targets. Noticed that GCC trunk build fails when targeting cortex-m23 (v8-m.baseline), problems in support libs (libgcc, newlib) * GCC upstream validation: - reported a few regressions - dealing with some random results, again * GCC: - bug report on aarch64 about misaligned accesses. Waiting for more details to reproduce the problem. * misc (conf-calls, meetings, emails, ....) == Next == FDPIC: - GCC: discuss v3 patches where the way forward is not clear yet - uclibc-ng: look at how to test fdpic mode with openadk - use qemu-system mode to run more tests

6 years, 10 months

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[ACTIVITY] week ending 18th October

by Peter Smith

[LLVM-203] (was TCWG-1424, we've moved issues to a new project) Started writing up results to close out this investigation. - Reran some sample profiling test cases with a higher sample rate. - Investigated why some test cases exploded in code-size with LTO. - Got some results for thin LTO (broadly similar to LTO). - Discovered that I need to pass in extra linker options to enable LTO to use the new pass manager, sample profiling and setting of optimisation level. -- Need to rerun these configurations over the weekend. - Have most of the surrounding text of the report written, now need to work on presentation of results. [TCWG-1473] Fix big-endian linux kernel builds for AArch32 Now committed upstream Holiday Friday

6 years, 10 months

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[ACTIVITY] Week 41

by Yvan Roux

o LLVM * Machine Outliner on ARM prototype: - Still debugging Thumb1 issues in Spec2K6 - Investigating issues in PIC mode * Bots babysitting o Misc * Various meetings and discussions.

6 years, 10 months

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[ACTIVITY] week ending 14 Oct 2018

by Richard Henderson

[VIRT-214 # SVE System Registers ] Posted v3 patch set. [VIRT-281 # Extend gdbstub for SVE ] Crashed gdb. Posted patch fixing buffer overrun. It was suggested to me that qemu's gdbstub might not support enough modern bits of the remote protocol for SVE. So I spent quite a bit of time reading up on the protocol and beginning to review [PATCH v2 00/15] gdbstub: support for the multiprocess extension In the end I'm not convinced there's anything missing for SVE. I think I'm going to have to examine upstream gdb more closely, running gdbserver proper. [Upstream] Collecting patches for tcg-next. Misc patch review. [GCC] Pinged my LSE patch set from 2 Oct. r~

6 years, 10 months

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[ACTIVITY] 8-12 October 2018

by Christophe Lyon

== Progress == * FDPIC - GCC: send v3 patches, got some feedback: will need another iteration * GCC upstream validation: - reported a few regressions - dealing with some random results, again * GCC: - looking at bug report on aarch64 about misaligned accesses. Need more details to reproduce the problem * Newlib - got a few small patches accepted * misc (conf-calls, meetings, emails, ....) == Next == FDPIC: - GCC: handle v3 patches feedback - uclibc-ng: look at how to test fdpic mode with openadk

6 years, 10 months

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[ACTIVITY] Weekly report for week 41

by Thomas Preudhomme

=== Work done during this past week === * TCWG-1428 (Support arithmetic on FileCheck regex variable): + continued cleaning up code and painfully rebased it on recent trunk * GNU-296 / GCC PR85434 / CVE-2018-12886: + fixed changes to routines for PIC access to use specified register + fixed 2 more issues in stack protector new instruction patterns + testing for arm and thumb2, now starting over due to one of the above issues * GNU-580 / PR86968: in progress + investigate, try 2 approaches, need to start looking into 3rd approach * Line management. === Plan for week 42 === * GNU-296 / GCC PR85434 / CVE-2018-12886: + finish testing, and submit new stack protector patch for upstream review * TCWG-1428 (Support arithmetic on FileCheck regex variable): + extend testcase coverage (add tests for latest syntax change and add more negative testing) + finish cleaning up the code * GNU-580 / PR86968: in progress + attempt 3rd approach * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management: + continue progress on rotations + start preparing first AFDS

6 years, 10 months

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[ACTIVITY] report week ending 12 Oct

by Peter Smith

[TCWG-1473] Fix -fno-integrated-as and -mbig-endian (Linux Kernel Build with clang) - Needed some revision to handle linker emulation. Patch in upstream review [TCWG-1474] Fix out of range branch (CBZ) when -fimplicit-it (or -fno-integrated-as) and certain kinds of inline assembly - Committed upstream. [TCWG-1424] Code-size investigations with PGO - Marking functions for size optimisation at the earliest possible stage improves code-size for little loss in performance. The main beneficiary is that loops are not unrolled in size optimised functions and inline thresholds are lower. - LTO with instrumented profiling still sees large increase in size. Originally thought my changes weren't working with LTO but I think that something else is happening. -- Found out that the profiling information isn't being sent to the LTO code-generator (although it should be present as IR annotations from the objects. -- There is an option to pass the sample profile through to the LTO code-generator but not an instrumented profile file. -- It seems like the LTO plugin doesn't use the new pass manager unless a separate option is passed through to the code-generator. -- It seems like Thin-LTO is where most of upstream development is these days and there is a slightly different pass pipeline, and some interaction with profiling. Worth some more experiments. First draft made of incorporating YVR18 Jira discussion into Confluence https://collaborate.linaro.org/display/TCWG/JIRA+Usage+and+Best+Practices

6 years, 10 months

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[ACTIVITY] report week ending 12 Oct

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - code review: + Xilinx Versal SoC support - investigated problem with a "suppress this warning patch" which gcc 8 didn't like. It turns out that _Pragma() in GCC is a bit of a disaster area; fortunately we only need to suppress a warning here for clang, so we can just avoid using _Pragma() with GCC. (cf GCC bugs 85153, 69558, 82335, 66099, 55578, 69543. clang is not flawless here either: cf clang bugs 31999, 15129, 35154. The clang false-positive warning we're working around is bug 39113.) * VIRT-164 [improve Cortex-M emulation] - stack-limit emulation patches have now gone into master, so this epic can be closed out. Some v8M work will continue under VIRT-268 (notably FP emulation); bugfixing and similar small work will go under the general VIRT-65 maintainership epic. * VIRT-215 ["run microvisors", aka support AArch32 Hyp mode] - working through some of the HCR bits we don't implement, to see if any of them are the cause of the failures I see with AArch32 hypervisors. (Sadly they don't seem to be.) Sent out patches implementing HCR.{FB,DC,VI,VF,PTW} and fixing some syndrome reporting corner cases where AArch32 differs from AArch64. thanks -- PMM

6 years, 10 months

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[ACTIVITY] week ending 7 Oct 2018

by Richard Henderson

[VIRT-249 # SVE System Mode ] Posted v3 (and hopefully final) patch set for system mode. [Upstream] Fixed a problem with softfloat division; 3 versions + pull posted. Posted v3 of a cleanup to 128-bit atomics. [GCC] V2 of the -matomic-ool patch set posted. r~

6 years, 10 months

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[ACTIVITY] Week 40

by Yvan Roux

o LLVM * Machine Outliner on ARM prototype: - Fixed some Thumb2 issues - Implemented Thumb1 support - Debugging Thumb1 issues in Spec2K6 * Bots babysitting o Misc * Various meetings and discussions.

6 years, 10 months

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[ACTIVITY] Weekly report for week 40

by Thomas Preudhomme

=== Work done during this past week === * One day annual leave * TCWG-1428 (Support arithmetic on FileCheck regex variable): + started cleaning up code and continued adding support for last syntax tweaks * TCWG-1379 / GCC PR85434 / CVE-2018-12886: rework needed + After more testing committed fix for register allocator and reverted following regression + fall back to workaround as register allocator lack information to decide whether it's safe to not reload an address + start testing workaround more extensively * TCWG-1470 / PR87374: upstream review + add missing documentation, improve related code slightly, submit for external review again Misc: + bits of line management + Doughnut session on OSS strategy + discussion around JIRA use in TCWG === Plan for week 41 === * TCWG-1379 / GCC PR85434 / CVE-2018-12886: + finish testing, and submit new stack protector patch for upstream review * TCWG-1428 (Support arithmetic on FileCheck regex variable): + finish change to support last syntax changes + extend testcase coverage (add tests for latest syntax change and add more negative testing) + start cleaning up the code * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management

6 years, 10 months

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[ACTIVITY] report week ending 5th October

by Peter Smith

[TCWG-1473] Fix -fno-integrated-as and -mbig-endian (Linux Kernel Build with clang) - Patch in upstream review [TCWG-1474] Fix out of range branch (CBZ) when -fimplicit-it (or -fno-integrated-as) and certain kinds of inline assembly - Patch in upstream review [TCWG-1424] Code-size investigations with PGO - Reworked the clang command line options and pass manager interface so I could insert the pass prior to inlining. - Benchmarks running over the weekend.

6 years, 10 months

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[ACTIVITY] week ending Oct. 7 2018

by Alex Bennée

SVE Support ([VIRT-198]) ======================== SVE Reviews - reviewed and tested {PATCH v2 0/4} softfloat: Fix division Message-Id: <20181003180711.19335-5-richard.henderson(a)linaro.org> and v3 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]) - following discussion with team started adding plugin hooks to [tracepoint clean-up] - I think I need to resurrect and expand the cputlb de-macro stuff to cleanly add memory tracing - written hotblocks and tlbstats tools - posted {RFC PATCH 00/21} Trace updates and plugin RFC Message-Id: <20181005154910.3099-1-alex.bennee(a)linaro.org> [VIRT-280] https://projects.linaro.org/browse/VIRT-280 [tracepoint clean-up] https://github.com/stsquad/qemu/tree/misc/dfilter-and-trace-tweaks-v2 Kernel Debug via gdbstub - There was some discussion about improving debug experience with kernel debugging - for example while in KVM a single-step usually goes to the exception table - in TCG this isn't always the case (maybe time accounting is better?) - follow-up on x86 and kgdb experience :todo - worth creating a STORY for this work? :todo Upstream Work ([VIRT-109]) ========================== - started looking at {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> - get the upstream CI back on track :todo [VIRT-109] https://projects.linaro.org/browse/VIRT-109 Other Tasks =========== - Started drafting the QEMU Keynote/Status report for KVM Forum 2018 Completed Reviews [6/6] ======================= {PATCH v3 0/3} softfloat tests based on berkeley's testfloat Message-Id: <20180913213910.28189-1-cota(a)braap.org> - CLOSING NOTE [2018-09-28 Fri 19:40] I'm happy with this {PATCH v2 0/4} softfloat: Fix division Message-Id: <20181003180711.19335-5-richard.henderson(a)linaro.org> - CLOSING NOTE [2018-10-04 Thu 10:37] some failures on emilio's tests {Qemu-devel} {RFC PATCH v2 0/3} acceptance tests: Test firmware checking debug console output Message-Id: <20181003183036.6716-1-philmd(a)redhat.com> - CLOSING NOTE [2018-10-04 Thu 15:07] Still broken for multiarch {PATCH v2 0/4} per-TLB lock Message-Id: <20181003200454.18384-1-cota(a)braap.org> - CLOSING NOTE [2018-10-04 Thu 15:07] Baring a few compile fixes it looks pretty stable in the soak tests. {PATCH} fpu/softfloat: Replace countLeadingZeros32/64 with clz32/64 Message-Id: <1538118095-7003-1-git-send-email-thuth(a)redhat.com> - CLOSING NOTE [2018-10-04 Thu 15:09] Simple clean-up {PATCH v3 0/4} softfloat: Fix division Message-Id: <20181004175700.20847-1-richard.henderson(a)linaro.org> - CLOSING NOTE [2018-10-05 Fri 16:59] Looks good Absences ======== - KVM Forum 2018 (24th-26th October 2018) Current Review Queue ==================== * {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> * {Qemu-arm} {PATCH 00/13} target/arm: Implement v8M stack limit checks Message-Id: <20181002163556.10279-1-peter.maydell(a)linaro.org> * {Qemu-arm} {PATCH v2 00/15} gdbstub: support for the multiprocess extension Message-Id: <20181001115704.701-1-luc.michel(a)greensocs.com> * {Qemu-devel} {PATCH v2 0/9} target/arm: Rely on id regs instead of features Message-Id: <20180927211322.16118-1-richard.henderson(a)linaro.org> * {Qemu-devel} {PATCH v2 00/15} target/arm: sve system mode patches Message-Id: <20180926192323.12659-1-richard.henderson(a)linaro.org> * {Qemu-arm} {PATCH v2 00/15} gdbstub: support for the multiprocess extension Message-Id: <20181001115704.701-1-luc.michel(a)greensocs.com> -- Alex Bennée

6 years, 10 months

1
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[ACTIVITY] report week ending 5 Oct

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - code review: + bug fixes for aarch64 KVM debug support + various patches to avoid deprecated sysbus:init API + SVE system emulation support - investigated a bug where system reset requested by a device model was sometimes not firing -- seems to be a race condition * VIRT-164 [improve Cortex-M emulation] - picked up the half-finished patches for stack-limit emulation that I'd written before going off on holiday, and completed them. Sent the patchset out for review. - sent patches for a couple of other minor bugs noticed in the process thanks -- PMM

6 years, 10 months

1
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[ACTIVITY] 1-5 October 2018

by Christophe Lyon

== Progress == * FDPIC - GCC: handling feedback on v2 patches * GCC upstream validation: - reported a few regressions - dealing with some random results, again - discussing collaboration with kernel-ci * Linaro gcc-7 release - backported fixes for bug #4007 * Newlib - sent a few small patches to remove warnings when building for Arm and Aarch64 * misc (conf-calls, meetings, emails, ....) - (internal) Wrote report about GNU Cauldron 2018 == Next == FDPIC: - GCC: send v3 patches feedback - uclibc-ng: look at how to test fdpic mode with openadk

6 years, 10 months

1
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[ACTIVITY] week ending 30 Sep 2018

by Richard Henderson

Progress: [VIRT-214 # SVE System Registers ] Posted v2 patch set for eliminating redundancy between feature bits and id registers. [VIRT-249 # SVE System Mode ] Posted v2 patch set, without the system registers included. [Upstream] First 3.1 tcg-next pull request. Spent a day working on Emilo's suggestion to out-line the entire softmmu load/store operation. I've placed a shed load of small code segments within the tcg "prologue", which is within a direct call of the entire code_gen_buffer. Emilio got some performance numbers from that which look promising. Need to clean up the patch to work with 32-bit and win64. [GCC] V1 of my SUSE+ARM inspired -matomic-ool patch set posted. Includes some significant improvements to atomic operations in the aarch64 backend. Got some good feedback and am working my way through those. r~

6 years, 10 months

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[ACTIVITY] 10-28 September 2018

by Christophe Lyon

* Recovery from Cauldron, then from Connect == Progress == * FDPIC - GCC: handling feedback on v2 patches * GCC upstream validation: - reported a few regressions - dealing with some random results, again * Linaro gcc-7 release - backported fixes for bug #4007 * Newlib - checked warnings emitted by GCC during newlib build, will send small patches * misc (conf-calls, meetings, emails, ....) - Attended Linaro Connect YVR18, contributed to report == Next == FDPIC: - GCC: handle v2 patches feedback - uclibc-ng: look at how to test fdpic mode with openadk - look at how to use Linux kernel atomics

6 years, 10 months

1
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[ACTIVITY] Week 39

by Yvan Roux

o LLVM * Machine Outliner on ARM prototype: - Improved stack fixup handling - Completed Thumb2 support - Fixed an issue in Thumb and ARM related to conditional execution * Bots babysitting o Misc * Various meetings and discussions.

6 years, 10 months

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[ACTIVITY] week ending Sep. 30 2018

by Alex Bennée

SVE Support ([VIRT-198]) ======================== - generated a [narrow test case for fdiv_64 rounding error] - doesn't hit much code but I possibly misunderstanding [the code] AFAICT inc = ((frac & roundeven_mask) != frac_lsbm1 ? frac_lsbm1 : 0); seems reasonable [VIRT-198] https://projects.linaro.org/browse/VIRT-198 [narrow test case for fdiv_64 rounding error] https://github.com/stsquad/qemu/tree/testing/generic-op-tester [the code] https://github.com/stsquad/qemu/blob/testing/generic-op-tester/fpu/softfloa… 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]) - following discussion with team started adding plugin hooks to [tracepoint clean-up] - I think I need to resurrect and expand the cputlb de-macro stuff to cleanly add memory tracing [VIRT-280] https://projects.linaro.org/browse/VIRT-280 [tracepoint clean-up] https://github.com/stsquad/qemu/tree/misc/dfilter-and-trace-tweaks-v2 Upstream Work ([VIRT-109]) ========================== - posted {PATCH v1 0/4} fixes for kvm/arm64 guest debug Message-Id: <20180926112048.17778-1-alex.bennee(a)linaro.org> - posted {PATCH} cpus: fix TCG kick timer leak Message-Id: <20180927171724.30128-1-alex.bennee(a)linaro.org> [VIRT-109] https://projects.linaro.org/browse/VIRT-109 Other Tasks =========== - Administrava - sorted out expenses for Connect - organising travel/accommodation for KVM Forum 2018 Completed Reviews [1/1] ======================= {PATCH v3 0/3} softfloat tests based on berkeley's testfloat Message-Id: <20180913213910.28189-1-cota(a)braap.org> - CLOSING NOTE [2018-09-28 Fri 19:40] I'm happy with this Absences ======== - KVM Forum 2018 (24th-26th October 2018) Current Review Queue ==================== * {Qemu-devel} {RFC PATCH 00/13} target/arm: Derive cpu id regs from features Message-Id: <20180915161738.25257-1-richard.henderson(a)linaro.org> * {PATCH 00/20} target/arm: sve system mode patches Message-Id: <20180809042206.15726-1-richard.henderson(a)linaro.org> * {RFC PATCH 00/12} tests/tcg: Add TriCore tests Message-Id: <20180501142222.19154-1-kbastian(a)mail.uni-paderborn.de> * {RFC PATCH v2 00/23} KVM: arm64: Initial support for SVE guests Message-Id: <1538141967-15375-1-git-send-email-Dave.Martin(a)arm.com> * {PATCH 00/35} exec: drop BQL from interrupt handling Message-Id: <20180917163103.6113-1-cota(a)braap.org> * {PATCH v3 00/13} i386 + x86_64 mttcg Message-Id: <20180911202823.21657-1-cota(a)braap.org> -- Alex Bennée

6 years, 10 months

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[ACTIVITY] report week ending 28 September

by Peter Smith

[Connect] Wrote up Connect Report with notes of presentations and hack-rooms, for better or worse we have 20 pages of notes. Wrote up Jira discussion [TCWG-1468] Made an example of how to use cmake, clang, newlib and a gcc-embedded toolchain to build an example and run it on qemu. [TCWG-1473] Linux kernel big-endian builds Nearly have a fix that I'm happy with ready to submit. [TCWG-1471] Fix the Armv6 Linux kernel build Committed upstream today.

6 years, 10 months

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[ACTIVITY] Weekly report for week 37 to 39

by Thomas Preudhomme

=== Work done during these past 3 weeks === * DSGHACK-25 (Support arithmetic on FileCheck regex variable): + all my tests pass, started to implement further minor changes to the syntax * PR87374: external review + investigate bug, write patch, test it and send for external review * GCC PR85434 / CVE-2018-12886: rework needed + Approved upstream but found when doing last minute testing after rebase + Testing on a wide number of targets a patch to register allocator to properly ignore some operand when told to * Linaro Connect Vancouver 2018 + prepare talk, attend event and write up reports * Regression testing of LLVM release: + extend script to do a LLVM release to be able to build from an arbitrary branch + make weekly regression build from trunk + fix here-doc in regression job to test release when scripts it use change Misc: + bits of line management + catching up on emails === Plan for week 40 === * GCC PR85434 / CVE-2018-12886: + finish testing, and get both register allocator fix and stack protector fix committed * PR87374: external review + add documentation and send back for external review * DSGHACK-25 (Support arithmetic on FileCheck regex variable): + finish change to suport last syntax changes + extend testcase coverage (add tests for latest syntax change and add more negative testing) + start cleaning up the code * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management

6 years, 10 months

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[ACTIVITY] report week ending 28 Sep

by Peter Maydell

Progress: * Post-travel/holiday catchup (email, expenses claims, code review, team meetings etc) (this was the lion's share of the time) * VIRT-65 [QEMU upstream maintainership] - some patches to fix clang warnings about taking the address of a field in a packed struct - make the compatibility "virt-2.10" machine really behave like the 2.10 QEMU's virt board: don't generate external aborts for accesses to bad physical addresses. (It turns out a few misconfigured Linux kernels do this.) - noticed that we only have another 40 or so devices to convert to be able to complete an API transition (sysbus init methods): wrote this up for the list to nudge people into doing some conversions thanks -- PMM

6 years, 10 months

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[ACTIVITY] report week ending 21 Sep

by Peter Maydell

Progress: This week was Linaro Connect (Vancouver). Recordings are online for most sessions I think; some may still be in the process of being uploaded. For other presentations see: https://connect.linaro.org/resources/yvr18/ Interesting presentations: * "My other Machine is Virtual" -- Alex's talk summarising QEMU's current tracing/debug facilities: https://connect.linaro.org/resources/yvr18/yvr18-118/ * "SBSA QEMU" -- Summary of work on an "enterprise" model in QEMU intended for use as a development platform for firmware and other lower-level code. https://connect.linaro.org/resources/yvr18/yvr18-511/ * "How to build a C++ processing tool using the clang libraries" -- Peter Smith doing a fast pass through the clang library APIs you can use for refactoring-type tools that operate on C++ source. Watch the talk to figure out if this is something you want to do at all; read the slides separately for the fine detail and links to where to find more info, if the answer is "yes"... https://connect.linaro.org/resources/yvr18/yvr18-223/ * "Diary of a drive-by coder: tips and tricks for working with upstream" -- James Bottomley talks about successes and failures in upstreaming one-off patches if you're not a member of the community. I also asked in the Q&A about what communities can do to make life easier for such contributors (answer mostly revolved around better and clearer communication about the chances of a change being accepted) https://connect.linaro.org/resources/yvr18/yvr18-503/ * "An open source developer and a lawyer walk into a bar..." -- Jilayne Lovejoy's keynote (Personal takeaway: try to reduce my use of "IANAL, but...".) https://connect.linaro.org/resources/yvr18/yvr18-200k2/ * Fujitsu's keynote on their new A64FX CPU: https://connect.linaro.org/resources/yvr18/yvr18-400k1/ * Arm Architecture Enhancements in 2018 Matt Gretton-Dann's presentation of ARM v8A 8.5 features. I was particularly encouraged to see that Arm have been able to make public the system register and ISA XML on the same day they announce the new features publicly. https://connect.linaro.org/resources/yvr18/yvr18-104/ Useful meetings: * discussion with RTH about handling CPU ID register fields vs internal QEMU "enable this feature" bits (we have a bit of an ugly mix of specifying the same thing in both places, and also overriding ID reg fields from feature bits in some cases; we'd like to achieve a bit more consistency in what we do...) * discussion with RTH/Alex on instrumentation plugin APIs. I hope we're now more or less on the same page about the general principles. * QEMU roadmap sync with Alex/RTH/Maxim: - finish v8M work - heterogenous CPU support (for Musca board emulation) - finish SVE - fill in other v8.x missing emulation support - instrumentation work Other: * Greensocs have sent out some QEMU patches to do with modelling clock trees, which also touch a bit on reset. QEMU's modelling of reset at the moment is pretty terrible, so I had a think about how we might manage to do it better. (Notably we currently only model power-on reset, and we don't have a good answer for "device A in reset wants to assert a signal that connects to device B, but there's no guarantee about what order A and B will reset in". Does anybody know of any good existing treatments of modelling device reset ?) thanks -- PMM

6 years, 11 months

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[ACTIVITY] Week 38

by Yvan Roux

o LLVM * Machine Outliner on ARM prototype: - Rebased on trunk - Thumb support on-going * Bots babysitting o Misc * Various meetings and discussions.

6 years, 11 months

1
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[ANNOUNCE] Arm Binary A-profile Toolchain Release GCC 8.2-2018.08

by Przemyslaw Wirkus

The Arm GNU Toolchain for the A-profile Architecture ===================================================== The Arm GNU Toolchain for the A-profile Architecture 8.2-2018.08 Release is now available. Arm is pleased to announce the first Arm-built release of the pre-built GNU cross-toolchain for the A-profile cores: GCC 8.2-2018.08. This is the same toolchain that was previously built and distributed by Linaro. For the official announcement, see: https://community.arm.com/tools/b/blog/posts/pre-built-gnu8-cross-toolchain… For more information about the GNU Arm toolchain and to download the release packages, see the Arm Developer website at: https://developer.arm.com/open-source/gnu-toolchain/gnu-a For an explanation of FSF GCC 8 series changes see: https://gcc.gnu.org/gcc-8/changes.html For help in porting to GCC 8 see the following explanation: https://gcc.gnu.org/gcc-8/porting_to.html Download the release packages from: (sources) https://developer.arm.com/open-source/gnu-toolchain/gnu-a/downloads (binaries) https://developer.arm.com/open-source/gnu-toolchain/gnu-a/downloads Previous snapshots and release-candidates for GCC 7 and earlier are at: (sources) https://releases.linaro.org/components/toolchain/gcc-linaro/ (binaries) http://snapshots.linaro.org/components/toolchain/binaries/ Previous releases for GCC 7 and earlier are at: http://releases.linaro.org/components/toolchain/binaries/ A description of the Arm and AArch64 target triples can be found at: https://collaborate.linaro.org/display/TCWGPUB/ARM+and+AArch64+Target+Tripl… Host Requirements ================== * Ubuntu 14.04 LTS x86_64 or later or RHEL 6.9 x86_64: * x86_64 hosted cross compiler for AArch64 ELF bare-metal target (x86_64-aarch64-elf). * x86_64 hosted cross compiler for AArch64 ELF bare-metal, big-endian target (x86_64-aarch64_be-elf). * x86_64 hosted cross compiler for AArch64 GNU/Linux target (x86_64-aarch64-linux-gnu). * x86_64 hosted cross compiler for AArch64 GNU/Linux big-endian target (x86_64-aarch64_be-linux-gnu). * x86_64 hosted cross compiler for AArch32 bare-metal target (x86_64-arm-eabi). * x86_64 hosted cross compiler for AArch32 target with soft float (x86_64-arm-linux-gnueabi). * x86_64 hosted cross compiler for AArch32 target with hard float (x86_64-arm-linux-gnueabihf). * Windows 7 or later, for 32 and 64 bit OS: * i686-mingw32 hosted cross compiler for AArch32 bare-metal target (i686-mingw32-arm-eabi). * i686-mingw32 hosted cross compiler for AArch64 ELF bare-metal target (i686-mingw32-aarch64-elf). Package Versions ================= GCC 8.2.1 https://gcc.gnu.org/gcc-8/changes.html FSF glibc 2.28 http://lists.gnu.org/archive/html/info-gnu/2018-08/msg00000.html Newlib 3.0.0 https://sourceware.org/ml/newlib/2018/msg00019.html GNU Binutils 2.30 https://lists.gnu.org/archive/html/info-gnu/2018-01/msg00010.html FSF GDB 8.1.1 https://www.gnu.org/software/gdb/download/ANNOUNCEMENT libiconv 1.15 https://savannah.gnu.org/forum/forum.php?forum_id=8790 libexpat 2.2.5 https://github.com/libexpat/libexpat/blob/R_2_2_5/expat/Changes libgmp 4.3.2 libisl 0.15 libmpfr 3.1.6 libmpc 0.8.2 Sources provided in release source tar ball. News for GCC 8 (as of GCC 8.2-2018.08) ======================================= * All GCC 8.2 features. For details on GCC 8 release series, please refer to the list of changes, new features, and fixes. * Linaro specific pre-processor macros to ensure that this is a continuation from the Linaro releases. * Spectre v1 mitigation backport from upstream FSF trunk include the revisions listed below. This is an initial backport of those mitigations in the GNU toolchain and should be regarded as support for prototyping and early access only. Moreover, while the backports include support for the other architectures, they are included for completeness and all issues regarding these patches must be taken up upstream in the https://gcc.gnu.org/bugzilla by reproducing the same with upstream FSF trunk. Arm is interested in feedback regarding these workarounds for Spectre v1. A description of the mitigation has been published on LWN.net. For more details about Spectre V1 defense in GCC visit: https://lwn.net/Articles/759423/ Contact Arm ============ For any questions, please use the Arm Communities forums at: https://community.arm.com/tools/ Please report any bugs via the Linaro Bugzilla at: https://bugs.linaro.org/

6 years, 11 months

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[ACTIVITY] Week 37

by Yvan Roux

o LLVM * Buildbots babysitting: - Investigating armv7 bots failures, having hard time to reproduce the issue * Machine Outliner on ARM prototype: - worked on LTO integration - more stack fixups to handle o Misc * Various meetings and discussions.

6 years, 11 months

1
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[ACTIVITY] week ending Sep. 16 2018

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= - thoughts after reviewing {Qemu-devel} {RFC PATCH v2 0/7} QEMU binary instrumentation prototype Message-Id: <152819515565.30857.16834004920507717324.stgit@pasha-ThinkPad-T60> - we want rich tooling but don't want to leak internals to plugins - the proposed helper per insn is pretty limited/hacky - I think we could expand exiting trace support with plugins - plugin hook to trace points - plugin either filters trace points or does in-situ analysis - existing trace infrastructure used to export data [VIRT-252] https://projects.linaro.org/browse/VIRT-252 Upstream Work ([VIRT-109]) ========================== - investigating CI failure in master: - The [Travis builds have been broken for a while] - meanwhile it looks like [atomic_8 issues have broken 32 bit builds] - reviewed {PATCH 0/6} i386 + x86_64 mttcg Message-Id: <20180903171831.15446-1-cota(a)braap.org> - posted {RFC PATCH 0/4} Add Nios II cross-compiler and enable tests/tcg Message-Id: <8346c1bb-9cb6-4c08-66a2-b5e5a31903d4(a)vivier.eu> [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [Travis builds have been broken for a while] https://travis-ci.org/qemu/qemu/builds [atomic_8 issues have broken 32 bit builds] https://app.shippable.com/github/qemu/qemu/dashboard Other Tasks =========== - Continued working on "My Other Machine is Virtual" talk for YVR18 - finished main talk, iterating and practising now - also made a few [fixes and enhacements for tlb tracking] - Administrava - caught up with expense claims for SynQuacer - organising for KVM Forum 2018 - organising/travel to Connect [fixes and enhacements for tlb tracking] https://github.com/stsquad/qemu/tree/misc/dfilter-and-trace-tweaks-v2 Completed Reviews [4/4] ======================= {PATCH 0/6} target/arm: More sve-ish fixes Message-Id: <20180810193129.1556-1-richard.henderson(a)linaro.org> - CLOSING NOTE [2018-09-07 Fri 16:36] Already in target-arm.next {Qemu-devel} {PATCH 0/3} synchronization profiler Message-Id: <20180813171132.21939-3-cota(a)braap.org> - CLOSING NOTE [2018-09-07 Fri 17:41] Already merged {PATCH 0/6} i386 + x86_64 mttcg Message-Id: <20180903171831.15446-1-cota(a)braap.org> - CLOSING NOTE [2018-09-10 Mon 10:18] Quick pass, looks OK but a question about __thread w.r.t tcg globals {PATCH v2 0/2} softfloat tests based on berkeley's testfloat Message-Id: <20180908191735.22861-1-cota(a)braap.org> - CLOSING NOTE [2018-09-10 Mon 12:27] Looks like an improvement on IBM test suite but needs a few more tweaks. Absences ======== - YVR18 Connect (17th-21st September 2018) - KVM Forum 2018 (24th-26th October 2018) Current Review Queue ==================== * {PATCH v3 0/3} softfloat tests based on berkeley's testfloat Message-Id: <20180913213910.28189-1-cota(a)braap.org> * {PATCH v3 00/13} i386 + x86_64 mttcg Message-Id: <20180911202823.21657-1-cota(a)braap.org> * {PATCH v6 00/25} Fixing record/replay and adding reverse debugging Message-Id: <20180912081747.3228.21861.stgit@pasha-VirtualBox> * {Qemu-devel} {PATCH v2 00/11} convert CPU list to RCU Message-Id: <374f82bc-1680-a59d-aa71-31e88e4936a2(a)redhat.com> * {Qemu-arm} {PATCH 00/15} gdbstub: support for the multiprocess extension Message-Id: <20180901124639.19735-1-luc.michel(a)greensocs.com> * {Qemu-devel} {PATCH v4 0/5} Acceptance/functional tests Message-Id: <20180530184156.15634-1-crosa(a)redhat.com> -- Alex Bennée

6 years, 11 months

1
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[ACTIVITY] 2 weeks ending 17 Sep 2018

by Richard Henderson

Last week: Holiday. 3 days at GNU Cauldron. Highlights: * Talked with arm folk re the sve simd abi, * Talked with arm folk re valgrind support for sve, * Talked with riscv folk re their nascent vector extension, * Peter Sewell's memory object semantics for defacto c. This week: Caught up on email backlog. Queued a few patch sets for first 3.1 tcg-next pull. Posted an rfc for adjusting arm id system regs vs feature bits. r~

6 years, 11 months

1
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Python test error

by Kugan Vivekanandarajah

Hi Mathias, I am not able to reproduce error in https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a7… Do you have any instructions for reproducing it locally. This is what I have done: Downloaded https://www.python.org/ftp/python/2.7.4/Python-2.7.4.tgz Applied following patch to build for aarch64: diff -r 84cef4f1999a -r 05e8999a3901 Modules/_ctypes/libffi/fficonfig.py.in --- a/Modules/_ctypes/libffi/fficonfig.py.in Mon Apr 29 16:09:39 2013 -0400 +++ b/Modules/_ctypes/libffi/fficonfig.py.in Tue Apr 30 01:00:34 2013 +0200 @@ -28,6 +28,7 @@ 'PA': ['src/pa/linux.S', 'src/pa/ffi.c'], 'PA_LINUX': ['src/pa/linux.S', 'src/pa/ffi.c'], 'PA_HPUX': ['src/pa/hpux32.S', 'src/pa/ffi.c'], + 'AARCH64' : ['src/aarch64/ffi.c', 'src/aarch64/sysv.S'], } ffi_sources += ffi_platforms['@TARGET@'] ./configure Also tried ./configure --enable-pydebug and --disable-optimization Also tried changing to -O0 manually in the make file make ./python Lib/test/regrtest.py -v test_ctypes Used gcc version 8.2.1 20180907 (GCC) Results are OK. Thanks, Kugan

6 years, 11 months

1
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[ACTIVITY] 3-9 September 2018

by Christophe Lyon

== Progress == * FDPIC - GCC: handling feedback on v2 patches * GCC upstream validation: - started looking at backlog of regression reports * misc (conf-calls, meetings, emails, ....) - preparing short session on FDPIC for Connect (TCWG hacking room) - Jira prioritization - Attended GNU Cauldron 2018 == Next == FDPIC: - GCC: handle v2 patches feedback - uclibc-ng: look at how to test fdpic mode with openadk - Connect: prepare hacking room presentation

6 years, 11 months

1
0
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[ACTIVITY] Week 36

by Yvan Roux

o LLVM * Buildbots babysitting * LLVM Kernel CI babysitting * Machine Outliner on ARM prototype still on-going o Misc * More Jira gardening * Various meetings and discussions.

6 years, 11 months

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[ACTIVITY] week ending Sep. 9 2018

by Alex Bennée

Upstream Work ([VIRT-109]) ========================== - reviewed {Qemu-devel} {RFC PATCH v2 0/7} QEMU binary instrumentation prototype Message-Id: <152819515565.30857.16834004920507717324.stgit@pasha-ThinkPad-T60> - reviewed {PATCH 0/6} qht improvements for 3.1 Message-Id: <20180817232923.28899-1-cota(a)braap.org> - investigating CI failure in master: - The [Travis builds have been broken for a while] - meanwhile it looks like [atomic_8 issues have broken 32 bit builds] [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [Travis builds have been broken for a while] https://travis-ci.org/qemu/qemu/builds [atomic_8 issues have broken 32 bit builds] https://app.shippable.com/github/qemu/qemu/dashboard Other Tasks =========== - Continued working on "My Other Machine is Virtual" talk for YVR18 - finished main talk, iterating and practising now - also made a few [fixes and enhacements for tlb tracking] - Administrava - caught up with expense claims for SynQuacer - organising for KVM Forum 2018 [fixes and enhacements for tlb tracking] https://github.com/stsquad/qemu/tree/misc/dfilter-and-trace-tweaks-v2 Completed Reviews [2/2] ======================= {Qemu-devel} {RFC PATCH v2 0/7} QEMU binary instrumentation prototype Message-Id: <152819515565.30857.16834004920507717324.stgit@pasha-ThinkPad-T60> - CLOSING NOTE [2018-09-07 Fri 15:40] Some interesting ideas but I think the interface needs to be a bit richer and expose the tcg code generation to the plugins. {PATCH 0/6} qht improvements for 3.1 Message-Id: <20180817232923.28899-1-cota(a)braap.org> - CLOSING NOTE [2018-09-07 Fri 16:35] Good improvements to test coverage, one minor tweak needed {PATCH 0/6} target/arm: More sve-ish fixes Message-Id: <20180810193129.1556-1-richard.henderson(a)linaro.org> - CLOSING NOTE [2018-09-07 Fri 16:36] Already in target-arm.next {Qemu-devel} {PATCH 0/3} synchronization profiler Message-Id: <20180813171132.21939-3-cota(a)braap.org> - CLOSING NOTE [2018-09-07 Fri 17:41] Already merged Absences ======== - Holiday (16th-28th August 2018) - YVR18 Connect (17th-21st September 2018) - KVM Forum 2018 (24th-26th October 2018) Current Review Queue ==================== * {Qemu-arm} {PATCH 00/15} gdbstub: support for the multiprocess extension Message-Id: <20180901124639.19735-1-luc.michel(a)greensocs.com> * {PATCH 0/6} i386 + x86_64 mttcg Message-Id: <20180903171831.15446-1-cota(a)braap.org> * {Qemu-devel} {PATCH v4 0/5} Acceptance/functional tests Message-Id: <20180530184156.15634-1-crosa(a)redhat.com> * {Qemu-arm} {PATCH 00/10} target/arm: Some pieces of support for 32-bit Hyp mode Message-Id: <20180814124254.5229-1-peter.maydell(a)linaro.org> * {PATCH 00/20} target/arm: sve system mode patches Message-Id: <20180809042206.15726-1-richard.henderson(a)linaro.org> * {PATCH v4 00/14} fp-test + hardfloat Message-Id: <1528768140-17894-1-git-send-email-cota(a)braap.org> -- Alex Bennée

6 years, 11 months

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[ACTIVITY] Weekly report for week 36

by Peter Smith

[Linaro Connect] - Wrote my presentation for the official track (on using Clang libtooling and ASTMatchers) - Started working on hackroom presentation on profile guided optimisation in LLVM. In both cases writing a presentation on something you don't know much about forces you do a lot of learning. Plans for next week: - Finish hackroom presentation. Spare time will be spent on reviews and llvm/clang bugs

6 years, 11 months

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