linaro-toolchain

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by Thiago Jung Bauermann

Hello, # TCWG CI — GDB - Investigated why the GDB check jobs stopped succeeding, as reported by Maxim. It turns there was an upstream commit (which was soon reverted) that broke generation of the gdb.sum file and consequently our baseline results became empty. Theoretically the CI should recover from that but we don't deal well with this corner case. With Maxim's help, restored the baseline and now things should be back to normal. Will improve our scripts to avoid this trap. # CI Babysitting This week was my turn to baby sit the CI. - Investigated 12 regressions in GCC and reported 3. The others were already fixed. - Investigated 1 regression in GDB but it wasn't actually one. - Investigated 1 regression in QEMU but it was already fixed. -- Thiago

3 years, 3 months

[ACTIVITY] report week ending 23 Jun (inc. KVM Forum trip report)

by Peter Maydell

Progress: * UM-2 [QEMU upstream maintainership] - catch up on email after a week away - Put together some arm pull requests - sent out draft QEMU summit minutes for review - sent patch to avoid using the buggy __builtin_subcll in Apple Clang 14 - sent patch fixing build error with newer xkeyboard-data - some gardening of Coverity issue reports Last week was KVM Forum in Brno -- here's a quick trip summary: This year KVM Forum was a slightly smaller conference (2 days, single-track), as we are now organizing it independently of the Linux Foundation. The independent organization went pretty well this year (despite the slightly awkward short notice) and the conference was very useful both for the talks and for the hallway track. Interesting talks (just a sampling biased to my interests): * KVM: Arm Confidential Compute Architecture Support Suzuki Poulose presented a summary of FEAT_RME and the CCA hardware and software architecture, and how it's intended to fit into KVM * KVM/arm64: Episode V - The Blob Strikes Back Immediately following was Marc Zyngier and Oliver Upton from Google: their talk was a pretty strong critique of the CCA software stack architecture. Their central point is that having the RMM be "part of the firmware" rather than "part of the hypervisor" is going to cause a rerun of all the issues we've seen with dubious and non-upgradable vendor code in EL3. Secondly, having the fixed API between the hypervisor and the RMM restricts to least-common-denominator and provides no room for experimentation and optimizations. They want an architected way to deploy an RMM at boot time. * Handling complex guest exits with eBPF Will Deacon presented what he described as "conference driven development" -- an interesting prototype of having device models in the host kernel that are implemented in eBPF. This (in theory) gives you the performance gains of an in-kernel device without it putting a lot of C code onto the security boundary between the guest and host. * Challenges Revisited in Supporting Virt CPU Hotplug on architectures that don't Support CPU Hotplug (like ARM64) James Morse (Arm) and Salil Mehta (Huawei) presented on CPU hotplug. The underlying problem here remains that Arm has no hardware hotplug handling, so there's no clear model for what hotplug on a VM should look like. Cloud vendors have an obvious desire for the x86-style tooling to Just Work on Arm too. The gap between "we have a prototype that seems to work" and "upstreamable maintainable code" has not yet been bridged, though... * QEMU Arm CPU models and KVM Cornelia Huck (RedHat) had a talk that was intended as a statement of the problem rather than a proposed solution. At the moment we only let a KVM guest see the same CPU type as the host and don't have a mechanism for presenting a subset of features to it. KVM is about to get support for letting the VMM define what the guest should see in the ID registers, but how should we expose that to QEMU users without ending up with a thousand command line sub-options to turn on and off every architectural FEAT_FOO? And how do we deal with errata workarounds, which the guest currently selects based on the MIDR value? As usual, we held the QEMU Summit (an hour-long maintainer discussion mostly about process and organizational issues) during KVM Forum. I still need to write up the minutes for this, but they'll be published on the qemu-devel list shortly. thanks -- PMM

3 years, 3 months

Need emit_expr to write right shifted value.

by zac.walker＠linaro.org

Hi, In binutils I need to write an offset between two symbols shifted right by 2 bits. This offset is written to the xdata section. My code currently looks like this: exp.X_op = O_subtract; exp.X_add_symbol = symbol1; exp.X_op_symbol = symbol2; emit_expr (&exp, 2); This works fine but obviously the result value is not shifted. Anyone have a good option is to shift the output of emit_expr at write time? I cannot use resolve_expression because the symbols do not have correct addresses at the time this code executes. Any help appreciated, Zac

3 years, 3 months

[ACTIVITY] Report for week #24

by Thiago Jung Bauermann

Hello, # TCWG CI — GDB - Changed tcwg_gnu-build.sh to apply GDB testsuite patch to avoid infinite loop in tcwg_gdb_check--master-arm jobs, while it isn't committed upstream. - Started investigating corrupt gdb.sum.1 file in tcwg_gdb_check--master-arm jobs. I can't reproduce it by manually running the CI's "make check-gdb" command line, nor by using ABE. I can reproduce it with tcwg_gnu-build.sh though. - Came up with validate_failures.py change to make it cope with the corrupt gdb.sum.1 file, while the underlying cause isn't known. Submitted the change upstream. # TCWG Infrastructure - Reviewed some Gerrit requests for our CI scripts. # Misc - Did some travel planning for Linaro Employee Meeting and GNU Tools Cauldron. -- Thiago

3 years, 3 months

[ACTIVITY] week ending Jun. 11 2023

by Alex Bennée

Project Orko ============ - more virtio-gpu discussion, blog post soon Enable Arm Architecture in QEMU =============================== - prep for KVM Forum talk Other ===== - various syncs Absences ======== - KVM Forum next week Current Review Queue ==================== TODO [RFC v2 0/6] Native Library Calls Message-Id: <20230607164750.829586-1-fufuyqqqqqq(a)gmail.com> ================================================================================================= TODO [PATCH] Add virtio-sound and virtio-sound-pci devices Message-Id: <20230526204845.673031-1-manos.pitsidianakis(a)linaro.org> ============================================================================================================================== TODO [PATCH v2 00/10] hw/virtio: Build various target-agnostic objects just once Message-Id: <20230524093744.88442-1-philmd(a)linaro.org> ====================================================================================================================================== -- Alex Bennée Virtualisation Tech Lead @ Linaro

3 years, 3 months

[ACTIVITY] report week ending 9 Jun

by Peter Maydell

Progress: * UM-2 [QEMU upstream maintainership] - code review (including a new board-and-devices patchseries for a TI Tiva C devboard) - Put together an arm pull request - Investigated some bug reports, sent patches: * regression in Allwinner A10 interrupt controller * hang in icount mode on microbit with Zephyr guest * LDG doesn't return the right values when ATA==0 - prep for next week's KVM Forum trip * QEMU-530 [QEMU ARM v9.4 Baseline CPU for TCG] - handling review comments and rebasing of decodetree load/store conversion - investigating a few issues I noticed in the process -- PMM

3 years, 3 months

[ACTIVITY] Report for week #23

by Thiago Jung Bauermann

Hello, # TCWG CI — GDB - Addressed review comments and sent v2 and v3 of the patch fixing loop in gdb.reverse/step-reverse.exp. The testcase's original author gave his Reviewed-by, now waiting for approval by a maintainer. In the meantime, set up our CI to apply the patch locally. - Sent patch to the GDB mailing list implementing configure option '--with-additional-debug-dirs' to allow building a GDB binary with a custom install prefix but which also looks for debug info in /usr/lib/debug. This should solve the SIGILL issue on armhf-linux in our CI, and allow a few more tests to run on aarch64-linux. # TCWG Infrastructure - Reviewed some Gerrit requests related to notification and baseline updating. -- Thiago

3 years, 3 months

[ACTIVITY] week ending Jun. 4 2023

by Alex Bennée

Project Orko ============ - added date for initial [roadmap] [roadmap] <https://linaro.atlassian.net/wiki/spaces/ORKO/overview> Generic vhost-user-device ([ORKO-19]) ===================================== - posted [PATCH v2 00/13] virtio: add vhost-user-generic and reduce copy and paste Message-Id: <20230418162140.373219-1-alex.bennee(a)linaro.org> [ORKO-19] <https://linaro.atlassian.net/browse/ORKO-19> [branch for generic and rng] <https://github.com/stsquad/qemu/tree/virtio/vhost-user-device> [pull req for gpio simulated device support] <https://github.com/rust-vmm/vhost-device/pull/313> QEMU Upstream Work ([UM-2]) =========================== - posted [RFC PATCH] softmmu/vl: fix typo for PHASE_MACHINE_INITIALIZED Message-Id: <20230413090310.1197548-1-alex.bennee(a)linaro.org> - posted [PATCH 00/10] tracing: remove dynamic vcpu state Message-Id: <20230420150009.1675181-1-alex.bennee(a)linaro.org> - posted [PATCH 0/9] docs: various (style, punctuation and typo fixes) Message-Id: <20230420155723.1711048-1-alex.bennee(a)linaro.org> - posted [PATCH v4 0/6] testing/next: avocado, docs, gitlab Message-Id: <20230417134321.3627231-1-alex.bennee(a)linaro.org> - posted [PATCH v6 00/11] tracing: remove dynamic vcpu state Message-Id: <20230526165401.574474-1-alex.bennee(a)linaro.org> - posted [RFC PATCH] softfloat: use QEMU_FLATTEN to avoid mistaken isra inlining Message-Id: <20230523131107.3680641-1-alex.bennee(a)linaro.org> - posted [PATCH 0/8] testing/next: avocado logging, docs, gitlab Message-Id: <20230518162034.1277885-1-alex.bennee(a)linaro.org> - started prepping for KVM Forum Keynote [UM-2] <https://linaro.atlassian.net/browse/UM-2> Completed Reviews [10/10] ========================= [QEMU][PATCH] gitlab-ci.d/crossbuilds: Drop the '--disable-tcg' configuration for xen Message-Id: <20230411210422.24255-1-vikram.garhwal(a)amd.com> [RFC 0/1] add support of `--initrd` for ELF-ARM kernels Message-Id: <20230414073432.36000-1-slankes(a)eonerc.rwth-aachen.de> [PATCH 0/2] accel/tcg/plugin: host insn size for plugin Message-Id: <20230406022751.757980-1-fei2.wu(a)intel.com> [PATCH v2 0/8] iotests: make meson aware of individual I/O tests Message-Id: <20230303160727.3977246-1-berrange(a)redhat.com> [PATCH v2] tests/vm/freebsd: Update to FreeBSD 13.2 Message-Id: <20230419144553.719749-1-thuth(a)redhat.com> [PATCH v4 0/2] Improve code coverage for ppc64 Message-Id: <20230421042322.684093-1-kconsul(a)linux.vnet.ibm.com> [PATCH 0/2] gitlab: improve artifact handling Message-Id: <20230503145535.91325-1-berrange(a)redhat.com> [PATCH v2 0/3] tests/tcg/s390x: Enable the multiarch system tests Message-Id: <20230424114533.1937153-1-iii(a)linux.ibm.com> [PATCH] Add virtio-sound and virtio-sound-pci devices Message-Id: <20230526204845.673031-1-manos.pitsidianakis(a)linaro.org> [RFC] Native Library Calls Message-Id: <20230530142430.45834-1-fufuyqqqqqq(a)gmail.com> Other ===== - Sorting out logistics for KVM Forum Absences ======== - Bank holidays Current Review Queue ==================== TODO [PATCH] Add virtio-sound and virtio-sound-pci devices Message-Id: <20230526204845.673031-1-manos.pitsidianakis(a)linaro.org> ============================================================================================================================== TODO [PATCH v2 00/10] hw/virtio: Build various target-agnostic objects just once Message-Id: <20230524093744.88442-1-philmd(a)linaro.org> ====================================================================================================================================== TODO [PATCH 0/8] Tiva C Implementation Message-Id: <20230517081204.30333-1-m.elsayed4420(a)gmail.com> ================================================================================================== -- Alex Bennée Virtualisation Tech Lead @ Linaro

3 years, 4 months

[ACTIVITY] Report for week #22

by Thiago Jung Bauermann

Hello, # TCWG CI — GDB - Continued investigating issue with GDB on armhf-linux about getting SIGILL when trying to detect shared library loading/unloading. Noticed that the problem happens only in tests that use the distro's toolchain (either because they're for a language we don't build in ABE gcc, or because GDB itself is built with the distro toolchain), so the impact isn't as widespread as I initially thought. It still frequently causes trouble for our CI loop though. Working on a fix. - Investigated and fixed loop in gdb.reverse/step-reverse.exp that was causing tcwg_gdb_check--master-arm-build jobs to get stuck, as reported by Maxim. Posted patch to the GDB mailing list. # TCWG Infrastructure - Reviewed Gerrit requests about testing mailing list patches in our CI. -- Thiago

3 years, 4 months

[ACTIVITY] report week ending 2 Jun

by Peter Maydell

Progress (another short week, May is great this year): * UM-2 [QEMU upstream maintainership] - More review on some of RTH's atomics related patchsets - Put together an arm pull request - Sent out a call for agenda items for QEMU Summit * QEMU-530 [QEMU ARM v9.4 Baseline CPU for TCG] - decodetree load/store conversion done, patches sent out for review. After this I plan to go back to the FEAT_MOPS implementation (and then do the last part of the integer A64 decodetree conversion later in this release cycle). -- PMM

3 years, 4 months

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