linaro-toolchain

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[ACTIVITY] week ending Jul. 23 2023

by Alex Bennée

Project Orko ============ - Hosted sprint planning, syncs with EPAM and Xilinx [roadmap] <https://linaro.atlassian.net/wiki/spaces/ORKO/overview> Generic vhost-user-device ([ORKO-19]) ===================================== - spent some time improving coverage for CI on standaline PoC - syncing with RedHat on virtio-sound [ORKO-19] <https://linaro.atlassian.net/browse/ORKO-19> [QEMU bits] <https://github.com/stsquad/qemu/tree/virtio/vhost-user-device> [vhost bits] <https://github.com/stsquad/vhost/tree/standalone/get-specs> [vhost-device bits] <https://github.com/stsquad/vhost-device/pull/new/standalone/vrng-experiment> Enable Arm Architecture in QEMU =============================== [slides] <https://www.bennee.com/~alex/presentations/kvm23-qemu-keynote.html> [live stream feed] <https://www.youtube.com/live/vy-3oYEDKCQ?feature=share&t=3531> QEMU Upstream Work ([UM-2]) =========================== - started collecting stray fixes, ran into issue with [plugin patch] - has a poor interaction with the SH4 gUSA sequence [UM-2] <https://linaro.atlassian.net/browse/UM-2> [plugin patch] <https://patchew.org/QEMU/CADc=-s5RwGViNTR-h5cq3np673W3RRFfhr4vCGJp0EoDUxvho…> Completed Reviews [1/1] ======================= [PATCH v3 0/3] Add VIRTIO sound card Message-Id: <cover.1689692765.git.manos.pitsidianakis(a)linaro.org> Absences ======== - Summer holidays until 2nd week of August Current Review Queue ==================== TODO [PATCH 0/4] chardev/char-fe: Document FEWatchFunc and use G_SOURCE_CONTINUE/REMOVE Message-Id: <20230705133139.54419-1-philmd(a)linaro.org> ============================================================================================================================================= TODO [PATCH v2 0/3] util/fifo8: Introduce fifo8_peek_buf() Message-Id: <20230705131859.53970-1-philmd(a)linaro.org> ================================================================================================================ TODO [PATCH v3 0/4] Virtio shared dma-buf Message-Id: <20230524091333.201767-1-aesteve(a)redhat.com> ================================================================================================= -- Alex Bennée Virtualisation Tech Lead @ Linaro

3 years, 2 months

'(...)Applications/ClamAV/clamscan' is missing

by Andrzej Warzynski

Hi everyone, I'm not 100% sure whether this is a bot misconfiguration issue, but couldn't find any other source of this failure: ``` ******************** TEST 'test-suite :: MultiSource/Applications/ClamAV/clamscan.test' FAILED ******************** Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/test/sandbox/build/MultiSource/Applications/ClamAV/clamscan' is missing ******************** ``` Link: https://lab.llvm.org/buildbot/#/builders/197/builds/8209 Would anyone be able to take a look? Thank you :) -Andrzej IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

3 years, 2 months

[ACTIVITY] report week ending 14 Jul

by Peter Maydell

Progress: * UM-2 [QEMU upstream maintainership] - investigated and fixed a bug in page-table-walk handling of debug accesses that was introduced by the FEAT_RME changes - that prompted me to look at a cleanup of some of the ptw code so that we consistently look at "which space is this walk for" and don't carry around a parallel boolean "secure/non-secure" that duplicates that information - found and fixed a few other ptw bugs along the way -- PMM

3 years, 3 months

[ACTIVITY] week ending Jul. 9 2023

by Alex Bennée

Project Orko ============ - held kick-off with the EPAM guys [roadmap] <https://linaro.atlassian.net/wiki/spaces/ORKO/overview> Generic vhost-user-device ([ORKO-19]) ===================================== - PoC for standaline vhost-user daemons - [QEMU bits] - [vhost bits] - [vhost-device bits] [ORKO-19] <https://linaro.atlassian.net/browse/ORKO-19> [QEMU bits] <https://github.com/stsquad/qemu/tree/virtio/vhost-user-device> [vhost bits] <https://github.com/stsquad/vhost/tree/standalone/get-specs> [vhost-device bits] <https://github.com/stsquad/vhost-device/pull/new/standalone/vrng-experiment> Enable Arm Architecture in QEMU =============================== - Delivered talk at KVM Forum - See [slides] and [live stream feed] (dodgy audio) [slides] <https://www.bennee.com/~alex/presentations/kvm23-qemu-keynote.html> [live stream feed] <https://www.youtube.com/live/vy-3oYEDKCQ?feature=share&t=3531> QEMU Upstream Work ([UM-2]) =========================== - posted [PATCH 0/5] docs/devel: improve API documentation for QOM Message-Id: <20230619171437.357374-1-alex.bennee(a)linaro.org> - posted [PULL 00/38] maintainer updates for 8.1: testing, fuzz, plugins, docs, gdbstub Message-Id: <20230703134427.1389440-1-alex.bennee(a)linaro.org> [UM-2] <https://linaro.atlassian.net/browse/UM-2> Completed Reviews [4/4] ======================= [PATCH 0/2] tests: lcitool: Refresh to latest lcitool changes Message-Id: <cover.1685528076.git.eskultet(a)redhat.com> [PATCH v3 0/8] gdbstub: Add support for info proc mappings Message-Id: <20230606132743.1386003-1-iii(a)linux.ibm.com> [PATCH] contrib/plugins: add meson build file Message-Id: <20230615141315.961315-1-anton.kochkov(a)proton.me> [RFC v3 00/10] Native Library Calls Message-Id: <20230625212707.1078951-1-fufuyqqqqqq(a)gmail.com> Other ===== - various syncs Current Review Queue ==================== TODO [PATCH 0/4] chardev/char-fe: Document FEWatchFunc and use G_SOURCE_CONTINUE/REMOVE Message-Id: <20230705133139.54419-1-philmd(a)linaro.org> ============================================================================================================================================= TODO [PATCH v2 0/3] util/fifo8: Introduce fifo8_peek_buf() Message-Id: <20230705131859.53970-1-philmd(a)linaro.org> ================================================================================================================ TODO [PATCH v3 0/4] Virtio shared dma-buf Message-Id: <20230524091333.201767-1-aesteve(a)redhat.com> ================================================================================================= -- Alex Bennée Virtualisation Tech Lead @ Linaro

3 years, 3 months

[ACTIVITY] Report for week #27

by Thiago Jung Bauermann

Hello, # TCWG CI - Changed tcwg_gnu-build.sh to apply GDB patch adding '--with-additional-debug-dirs' option, and ABE's gdb.conf to use it. Also changed both to add '--prefix /usr' option to GDB's configure. Both changes to fix ld.so debug info issues in GDB testsuite runs on armhf. - Testing changes to validate_failures.py and jenkins-scripts to handle empty gdb.sum. - Reviewed a few Gerrit requests. -- Thiago

3 years, 3 months

[ACTIVITY] report week ending 6 Jul

by Peter Maydell

Progress (short week, 3 days): * UM-2 [QEMU upstream maintainership] - softfreeze is next week, so spent some time putting together a pull request, fixing the bugs which the CI tests found in it, etc * QEMU-422 [QEMU Arm Neoverse V1 vCPU for TCG] - now that we implement all the necessary features (excluding some trace/profiling type stuff that is out-of-scope for QEMU, and also FEAT_NV that we might come back to later), sent out the patchset to define a 'neoverse-v1' CPU type for QEMU -- PMM

3 years, 3 months

[ACTIVITY] Report for week #26

by Thiago Jung Bauermann

Hello, # TCWG Infrastructure - Investigated why the CI didn't recover from empty gdb.sum, since it was supposed to. - Fixing validate_failures.py and tcwg_gnu-build.sh to correctly handle empty gdb.sum. - Fixing GDB armhf CI jobs to find distro's debug info. # CI Babysitting - Verified that a couple of regressions I reported last week were fixed in trunk. -- Thiago

3 years, 3 months

[ACTIVITY] Report for week #25

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

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