Three day week.
[GNU-180 # Fix gcov crash on program exit]
Fiddled around with TI-RTOS for a while before I realized that was sort of
beside the point. Gave the reporter a method do avoid dumping during the
global destructors. Still need to look into where the reported stack space
problem might be.
[Upstream]
Out-of-line softmmu patches got some work. Added ppc64 support. Fixed a race
and a code removal crash. Emilio verified -5% aa64 boot+shutdown time, but it
performed less well on spec2006.
Reviewed risc-v host patch set.
r~
QEMU Tooling ([VIRT-252])
=========================
QEMU plugin support ([VIRT-280])
- started reviewing Emilio's {RFC 00/48} Plugin support Message-Id:
<20181025172057.20414-1-cota(a)braap.org>
- port my example tools to his framework :todo
[VIRT-280] https://projects.linaro.org/browse/VIRT-280
Upstream Work ([VIRT-109])
==========================
- 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>
[VIRT-109] https://projects.linaro.org/browse/VIRT-109
Other Tasks
===========
- [Video for KVM Forum QEMU status report] is up
- the rest of the [sessions are here]
- posted {PULL for 3.1 0/2} Testing tweaks Message-Id:
<20181114131008.27599-1-alex.bennee(a)linaro.org>
[Video for KVM Forum QEMU status report]
https://www.youtube.com/watch?v=GZBd3jt5iA8
[sessions are here]
https://www.youtube.com/channel/UCRCSQmAOh7yzgheq-emy1xA/videos
Completed Reviews [3/3]
=======================
{PATCH} tests/tcg/multiarch: fix 32bit linux-test on 64bit host
Message-Id: <20181113175437.26492-1-laurent(a)vivier.eu>
{Qemu-devel} {PATCH} hax: Support for Linux hosts
Message-Id: <20181114130428.32326-1-asanchez(a)kryptoslogic.com>
{Qemu-devel} {PATCH} target: hax: replace g_malloc with g_malloc0
Message-Id: <1542261954-4060-1-git-send-email-liq3ea(a)gmail.com>
Absences
========
- Christmas Holidays
- Connect BKK19 (1-5th April 2019)
Current Review Queue
====================
* {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>
* {Qemu-arm} {PATCH v5 0/4} target/arm: KVM vs ARMISARegisters
Message-Id: <20181113180154.17903-1-richard.henderson(a)linaro.org>
* {Qemu-devel} {PATCH for-4.0 00/17} tcg: Move softmmu out-of-line
Message-Id: <20181112214503.22941-1-richard.henderson(a)linaro.org>
* {Qemu-arm} {PATCH 00/13} Support disabling TCG on ARM
Message-Id: <20181113165247.4806-1-sameo(a)linux.intel.com>
* {Qemu-devel} {PATCH for-4.0 00/17} tcg: Move softmmu out-of-line
Message-Id: <20181112214503.22941-1-richard.henderson(a)linaro.org>
* {Qemu-arm} {PATCH v5 00/16} gdbstub: support for the multiprocess extension
Message-Id: <20181110081147.4027-1-luc.michel(a)greensocs.com>
--
Alex Bennée
LLD bug fixing and triage
pr39678 Calculation of DT_PLTRELSZ with strange linker script.
pr39662 Request to add more emulations
pr39634 LTO and references from inline symbols
D54474 Fix for incorrect relocation span out of ifunc review
D54624 Redefinition of _GLOBAL_OFFSET_TABLE_
=== Work done during the past 2 weeks ===
* Resurrect code size optimization for fmul/dmul from Tony Wang: bootstraping
+ rework slightly to better deal with switch of section and deal with
several possible section layout
+ start anew with a new approach based on symbol visibility
-> works without -gc-sections and does not rely on section layout
* Fix -mslow-flash-data: ready to upstream on Monday
+ some more cleanup and code improvement
* LLVM-432 (Support arithmetic on FileCheck regex variable):
+ started reworking parsing code to be separate from evaluation and support
more complex expression
* Infrastructure code review
=== Plan for week 47 ===
* 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.
Progress:
* VIRT-251 [AArch32 Hyp/running microvisors]
- fixes to the issues running L4Re/Fiasco have now been committed
to QEMU master for the 3.1 release
- some minor remaining missing functionality not needed for these guests
has been recorded as subtasks of VIRT-65
- this Epic is now closed!
* VIRT-65 [QEMU upstream maintainership]
- release work
- looked again at automation of uploads to the Coverity Scan service
(last try was last year); sent out revised patchset
- code review:
+ "sbsa reference board" model
+ LOR, HPD, AA32HPD extension support (rth)
+ Minimize TLB flushing for ASID changes (rth)
+ Support for loading uboot "noload" uimage files
+ better PMUv3 emulation
+ micro:bit SoC device models
thanks
-- PMM
== Progress ==
* FDPIC
- Cortex-M uClibc-ng patch still pending
- GCC: updated patches and sent v4
Tried to isolate the regressions observed on xtensa uclinux
toolchain with my patches.
Built a qemu-system-arm -based platform to run tests involving the
kernel. Built and ran a few LTP tests.
Unfortunately, LTP has dropped/is dropping support for uclinux
configs, for lack of interest
* 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, ....)
- reviewing infra script patches
== Next ==
FDPIC:
- GCC: handle feedback on v4 patches
- uclibc-ng: look at how to test fdpic mode with openadk
== Progress ==
* Catch up on things
- Remind myself what a laptop looks like, install updates etc etc
- Figure out new links, machines etc
- Clean up inbox
* [LLVM-59] Small changes to the LLVM helper scripts
- Had a look at all the remaining issues and closed them as obsolete
or already implemented
* [LLVM-479] Check current status of GlobalISel
- Read the mailing list to see what I’ve missed
- Started looking at the code
- Trying to run the test-suite on a TK1
* Misc
- Fixed a simple buildbot breakage
- Meetings
== Plans ==
* LLVM-479
== This Week ==
* GNU-405: Implement division using vrecpe/vrecps (1/10)
- Committed patch
* SVE ACLE (2/10)
- Continue work on shift intrinsics
* PR83750 (1/10)
- Addressing upstream comments
* Holidays (6/10)
- Diwali festival
== Next Week ==
- Continue working on SVE ACLE and PR83750
o 4 days week.
o LLVM
* 7.0.1-rc2:
- Built ARM and AArch64 binaries
- Investigating miscompare on AArch64
* Machine Outliner on ARM prototype:
- Investigating issues in PIC mode
- Testing IR Outliner
o Misc
* Various meetings and discussions.
[VIRT-241 # QEMU ARMv8.x support ]
The new ARM ARM was released (DDI0487 D_a) including ARMv8.4.
Add jira cards for all of the v8.4 features. Rearrange all of
the stories into a hierarchy so that it's easier to track which
cards belong to which architecture revision.
[VIRT-263 # ARMv8.1-VHE Virtual Host Extensions ]
Working my way through this rather large extension:
* Cleanup (most) direct uses of hcr_el2.
* Add new hypervisor virtual timer.
* Add contextidr_el2 and use it in breakpoint matching.
* Add system register aliasing and redirection.
* Added a new mmu_idx for the NS EL2&0 regime;
working through all the places that should be handled.
[Upstream]
Posted kvm-vs-idregs patch set v3.
r~
== Progress ==
* FDPIC
- Cortex-M uClibc-ng patch still pending
- GCC: handling feedback on v3 patches.
Managed to build/check xtensa uclinux toolchain with my patches.
Largely better, but a few new failures.
- working on kernel + qemu-system env to run more tests. Got help from
Nicolas Pitre.
* 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, ....)
- reviewing infra script patches
== 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
Progress:
* VIRT-65 [QEMU upstream maintainership]
- code review
+ more microbit device models
+ some raspi device model improvements
- sent patches for more Coverity issue fixes
- put together a list of source files still with legacy
non-QOM device models (about 60 files total)
- tagged QEMU 3.1.0 rc0
* VIRT-251 [aarch32 Hyp/running microvisors]
- tracked down a regression affecting L4Re guest: we had
misimplemented HCR.{VI,VF}. Sent patchset reverting the
broken version and implementing the correct semantics.
- finally tracked down why the 32-bit version of L4Re/Fiasco was
crashing -- we were incorrectly implementing Hyp mode as having
a banked r14, but it shares that register with User and System modes.
- These patches fix all the known issues with these guests.
thanks
-- PMM
=== Work done during the past week ===
* Resurrect code size optimization for fmul/dmul from Tony Wang:
+ clean up new testsuite directive andd testcases
* Fix -mslow-flash-data:
+ resurrect / rebase Arm internal patch to fix -mslow-flash-data
once and for all
+ many fixes to make it pass all testsuite with -mslow-flash-data without ICE
* Line management.
=== Plan for week 45 ===
* 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
o Two days off.
o LLVM
* Machine Outliner on ARM prototype:
- catch-up after vacation
- re-based prototype branch on upstream
- Investigating issues in PIC mode
== This Week ==
* PR83750: CSE erf/erfc pair (6/10)
- Submitted patch upstream
* SVE ACLE (2/10)
- Started working on shift intrinsics
* GNU-235 (1/10)
- Cancelled card after I realized vrp does not support floating point ranges -:/
* Misc (1/10)
- Meetings
== Next Week ==
- PR83750: Address upstream comments
- GNU-405: Benchmark patch to provide more evidence to make it acceptable.
- SVE ACLE: Continue work on shift intrinsics.
[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~
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
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
[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.
* 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
=== 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
Progress:
* Attended OSS Europe/KVM Forum
- as usual, a good week (helpful conversations, interesting sessions)
- full conference writeup later in the week
thanks
-- PMM
[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~
