SVE Support ([VIRT-198])
========================
- continued looking into Nils's SVE enabled Test_simd from Grid
failure
- __attribute__((noinline)) makes it go away, so subtle code
difference
- looking through side-by-side traces to find where it went wrong
- posted {RFC PATCH 0/4} add hand-rolled fallback when capstone
fails Message-Id: <20180808123934.17450-1-alex.bennee(a)linaro.org>
- finally fixed after Laurent's review comments - see [rth's latest
branch]
[VIRT-198] https://projects.linaro.org/browse/VIRT-198
[rth's latest branch]
https://github.com/stsquad/qemu/tree/testing/tgt-arm-sve-c
SVE Reviews
- reviewed {PATCH 00/11} target/arm: sve linux-user patches
Message-Id: <20180809034033.10579-1-richard.henderson(a)linaro.org>
- started reviewing {PATCH 00/20} target/arm: sve system mode patches
Message-Id: <20180809042206.15726-1-richard.henderson(a)linaro.org>
Upstream Work ([VIRT-109])
==========================
- posted {RFC PATCH 0/3} Tweaks to linux-user -dfilter Message-Id:
<20180809175553.18479-1-alex.bennee(a)linaro.org>
- posted {RFC PATCH 0/3} tweaks for QEMU's C standard Message-Id:
<0180810171102.16451-1-alex.bennee(a)linaro.org>
[VIRT-109] https://projects.linaro.org/browse/VIRT-109
Other Tasks
===========
- Submitted "My Other Machine is Virtual" abstract for YVR18
- this talk has been accepted
- Drafted the [Instrumentation EPIC]
- started added stories for various use-cases
[Instrumentation EPIC] https://projects.linaro.org/browse/TCWG-1457
Completed Reviews [1/1]
=======================
{PATCH 00/11} target/arm: sve linux-user patches
Message-Id: <20180809034033.10579-1-richard.henderson(a)linaro.org>
- CLOSING NOTE [2018-08-09 Thu 12:44]
Looks good, tested on a bunch of stuff
Absences
========
- Holiday (16th-28th August 2018)
- YVR18 Connect (17th-21st September 2018)
- KVM Forum 2018 (24th-26th October 2018)
Current Review Queue
====================
* {PATCH 00/20} target/arm: sve system mode patches
Message-Id: <20180809042206.15726-1-richard.henderson(a)linaro.org>
* {PATCH 0/5} tests/vm: Improvements when KVM is not available
Message-Id: <20180717024827.27897-1-f4bug(a)amsat.org>
* {RFC PATCH 00/12} tests/tcg: Add TriCore tests
Message-Id: <20180501142222.19154-1-kbastian(a)mail.uni-paderborn.de>
* {PATCH v4 00/14} fp-test + hardfloat
Message-Id: <1528768140-17894-1-git-send-email-cota(a)braap.org>
* {Qemu-devel} {RFC PATCH v2 0/7} QEMU binary instrumentation prototype
Message-Id: <152819515565.30857.16834004920507717324.stgit@pasha-ThinkPad-T60>
* {Qemu-devel} {RFC v2 0/2} Add BPF suuport to Qemu
Message-Id: <20180625110706.23332-1-sameeh(a)daynix.com>
--
Alex Bennée
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ found and fixed a last minute couple of bugs with VM migration
for Arm guests, one in the GICv3 and one for M-profile CPUs
+ triaging and applying fixes for last few rc4 bugs
+ sent a patch to make our checkpatch script catch multiline comment
style issues
+ LP:1777672: investigating reported bug in raspi framebuffer emulation
* VIRT-164 [improve Cortex-M emulation]
+ finished, tested, and sent patchset that implements the Master Security
Controller and adds the PL081 DMA and MSCs to the MPS2 AN505 board
+ wrote patches that add the PL022 SPI controllers to the AN505
(fixing some PL022 bugs in the process)
* finished sorting out last bits of travel for Connect and KVM Forum
* various JIRA ticket scrub/fettling
thanks
-- PMM
=== Work done during this week ===
* TCWG-1379 / GCC PR85434 / CVE-2018-12886: rework needed
+ fix issues seen on x86_64 and start a bigger round of testing
* TCWG-1337 / LLVM PR34170: last patch committed to trunk
+ address review comments and commit it once approved, then request
backport to LLVM 7 branch
* Submit and commit patch to clarify what tm.texi needs copying when
tm.texi.in is updated in source tree
* Misc:
+ Linaro syncs
+ 2 days and a half of Linaro JIRA gardening
=== Plan for week 33 ===
* Enable regression testing of Linaro release process
* DSGHACK-25 (Support arithmetic on FileCheck regex variable): address comments
+ continue to rework patch
* GCC PR85434 / CVE-2018-12886: rework needed
+ confirm all regressions are fixed
+ finish testing and submit for review
* Try to reproduce perf issue mentioned in week #30s weekly report on
latest perf
=== Work done during this week ===
* TCWG-1379 / GCC PR85434 / CVE-2018-12886: rework needed
+ commit and revert due to regression on x86 and in glibc for aarch64
-> seems there is at least 2 issues, *sigh*
* TCWG-1337 / LLVM PR34170:
+ track down and fix issue that patch 2/3 uncovered, then reapply 2/3
+ investigate regression from patch 1/3, fixed by patch 3/3
fortunately and believe this is the right fix
* Continue work on TCWG-1428 (Support arithmetic on FileCheck regex variable):
+ start rework patch to follow new syntax and accept numeric
expressions with several variables
* Linaro PR3943:
+ investigate issue, propose several workarounds to customer and
raise need for GCC release with combined multilib
* Misc:
+ Linaro syncs
+ bits of Linaro JIRA gardening
+ new ask question button and typo fix on developer.arm.com's GNU RM page
+ prepare Linaro Connect
=== Plan for week 32 ===
* Summarize state of GNU EPIC in JIRA
* Enable regression testing of Linaro release process
* DSGHACK-25 (Support arithmetic on FileCheck regex variable): address comments
+ continue to rework patch
* GCC PR85434 / CVE-2018-12886: rework needed
+ investigate regressions
* Try to reproduce perf issue mentioned in last weekly report on latest perf
*very short week (1 day) *
== Progress ==
* FDPIC
- uClibc-ng: posted v2 patches
* GCC upstream validation:
- looking at some random noise in testing
- reported a couple of regressions
* Infrastructure:
- misc cleanups
* misc (conf-calls, meetings, emails, ....)
== Next ==
Holidays: back on Aug 29th
o LLVM
* Machine Outliner on ARM prototype:
- Working on saving LR in a register support
- Working on stack fixups mechanism
* libcxxabi exception address alignment test failure:
- Fix submitted upstream
o Misc
* Various meetings and discussions.
== Progress ==
* FDPIC
- uClibc-ng: investigated regression in non-FDPIC code, preparing v2 patches
* GCC upstream validation:
- looking at some random noise in testing
- reported a couple of regressions
* Infrastructure:
- misc cleanups
* misc (conf-calls, meetings, emails, ....)
== Next ==
1-day week, the holidays. Back on Aug 29th
[VIRT-198 # QEMU: SVE Emulation Support ]
Fixed 4 bugs pointed out by Laurent on list.
Dump sve state with -d fpu.
[VIRT-249 # SVE System Mode ]
Clear sve state on vector length change on EL change.
[Upstream]
Finished v5 review of nanomips.
Fixed 4 sparc clone bugs.
Fixed a ppc fp load/store bug I introduced in June.
[Glibc]
Adjusted _dl_runtime_resolve and friends for the new ARM vector ABI;
posted for comment. ARM folk pointed out that I'd have to save even
more state than that, and really the compiler needs fixing to avoid
the PLT completely. The right people are talking about the problem.
r~
SVE Support ([VIRT-198])
========================
- traced the svetest failure from Naoki @ Naist to SVE ABI issue with
dynamic linker
- rth has posted [a fix for glibc] and a bug raised for armclang
w.r.t. noplt
- looking into Nils's SVE enabled Test_simd from Grid failure
- __attribute__((noinline)) makes it go away, so subtle code
difference
- looking through side-by-side traces to find where it went wrong
[VIRT-198] https://projects.linaro.org/browse/VIRT-198
[a fix for glibc]
https://sourceware.org/ml/libc-alpha/2018-08/msg00017.html
SVE Reviews
- reviewed {Qemu-devel} {PATCH 0/4} target/arm sve fixes Message-Id:
<20180801123111.3595-1-richard.henderson(a)linaro.org>
QEMU ARMv8.3 Support ([VIRT-241])
=================================
- had a [quick run at VHE] which crystallised some of the issues with
register aliasing
- obviously need to sit and think about a design for this
[VIRT-241] https://projects.linaro.org/browse/VIRT-241
[ARMv8.1 Mandatory Features]
https://projects.linaro.org/browse/TCWG-1434
[ARMv8.1 optional features] https://projects.linaro.org/browse/TCWG-1435
[quick run at VHE] https://github.com/stsquad/qemu/tree/add-vhe-rfc
Upstream Work ([VIRT-109])
==========================
- posted {PATCH v1 for 3.0 0/2} fix for bug 1783362 Message-Id:
<20180726132947.28538-1-alex.bennee(a)linaro.org>
- started reviewing {PATCH v5 00/24} Fixing record/replay and adding
reverse debugging Message-Id:
<20180725121311.12867.21729.stgit@pasha-VirtualBox>
- number of build issues need to be resolved
[VIRT-109] https://projects.linaro.org/browse/VIRT-109
Completed Reviews [3/3]
=======================
{PATCH 0/3} linux-user/sparc: Fixes for clone
Message-Id: <20180730201553.32423-1-richard.henderson(a)linaro.org>
- CLOSING NOTE [2018-08-01 Wed 14:35]
Still some issues with the tests
{PATCH v5 00/24} Fixing record/replay and adding reverse debugging
Message-Id: <20180725121311.12867.21729.stgit@pasha-VirtualBox>
- CLOSING NOTE [2018-08-01 Wed 14:36]
Bunch of build failures... gave up.
{Qemu-devel} {PATCH 0/4} target/arm sve fixes
Message-Id: <20180801123111.3595-1-richard.henderson(a)linaro.org>
- CLOSING NOTE [2018-08-02 Thu 10:28]
Looks good, but hasn't solved all remaining problems.
Absences
========
- YVR18 Connect (17th-21st September 2018)
- KVM Forum 2018 (24th-26th October 2018)
Current Review Queue
====================
* {PATCH 0/5} tests/vm: Improvements when KVM is not available
Message-Id: <20180717024827.27897-1-f4bug(a)amsat.org>
* {RFC PATCH 00/12} tests/tcg: Add TriCore tests
Message-Id: <20180501142222.19154-1-kbastian(a)mail.uni-paderborn.de>
* {PATCH v4 00/14} fp-test + hardfloat
Message-Id: <1528768140-17894-1-git-send-email-cota(a)braap.org>
* {Qemu-devel} {RFC PATCH v2 0/7} QEMU binary instrumentation prototype
Message-Id: <152819515565.30857.16834004920507717324.stgit@pasha-ThinkPad-T60>
* {Qemu-devel} {RFC v2 0/2} Add BPF suuport to Qemu
Message-Id: <20180625110706.23332-1-sameeh(a)daynix.com>
* {PATCH 0/4} tests/vm: various trivial fixes
Message-Id: <20180628153535.1411-1-f4bug(a)amsat.org>
--
Alex Bennée
[TCWG-1450] Support for Tag_ABI_VFP_args in LLD
Needed by FreeBSD in order to switch to LLD for Arm.
[TCWG-1451] Support for v5 and v6 Arm in LLD
Tidied up and submitted patches for v5/v6 (branch encoding and
compatible thunks), in upstream review.
[TCWG]
- Started doing some Jira gardening in preparation for status report
- Went back to libfuzzer hang on AArch64 buildbot. Looks like failure
to converge on -O2 and above, from the logs and code-generation I
suspect that it isn't handling the CINC instruction well (not
increasing coverage when the condition passes).
