bud17-221: what's new in qemu
TRANSCRIPT
What's new in QEMUAlex Bennée
Linaro Connect BUD17-221
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Budapest 2017
AgendaQEMU releases & new featuresIoT/uController discussion
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Budapest 2017
Since Last ConnectQEMU 2.8.0 (Dec 20th, 2016)QEMU 2.9.0 (April 4th, 2017)*Releases at 3-4 month cadenceNext release in August?
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Budapest 2017
QEMU 2.8
See for full noteschangelog
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Budapest 2017
ITS (Interrupt Translation Service)
MSI controllerVirtual MSIs with VMs with GICv3Required on GICv3 guests for
VHOSTDevice pass-through (SR-IOV)
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TCG Updates
New TCGOps for:Atomic operationsBarriers/fences
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New exclusive mechanism
Support oversized atomicsThread safe tb-�ush (�nally!)
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What's new in QEMU 2.9
See for full noteschangelog
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TCG EL2 Support
AArch64 onlyRequires GICv3
qemu-system-aarch64 ${QEMU_OPTS} \ -machine gic-version=3 \ -machine virtualization=true
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MTTCG
Finally thread-per-vCPU for system emulation!Long term project involving many groupsLinaro has been leading the work for a year
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MTTCG Supported Combinations
Default for ARMv7/AArch64 on x86_64Known to work for
x86-on-x86x86-on-AArch64 (slowly)
${QEMU} ${QEMU_OPTS} -accel tcg,thread=multi
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Cortex M �xes
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QEMU and IoT
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M-pro�le cores are di�erent
M-pro�le means micro-controllersDi�erent memory model (MPU)Di�erent memory model (MPU)Di�erent exception model (NVIC)Often running an RTOS
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Current M-pro�le models
TI Stellaris (Cortex M3)LM3S6965EVBLM3S811EVB
Netduino 2 (Cortex M3)
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Current Issues
Very little attentionLinaro has been very focused on A-pro�leNo community maintenance and little bug�xing
Long standing un-�xed bugsMissing important featuresNo support for newer CPUs (FPU, v6M)
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Modelling Hardware
Boring hardwaremostly just CPU, �ash and GPIOssome models may have a screen
Unconnected GPIO/PWM/ADC/DACs
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Ongoing work
NVIC/Exception handling (�xed in 2.9)Bare metal
MPU (add missing emulation)FPU (enable existing instructions, new exceptionmodel)v6m (Cortex M0, M0+1, M1) and v8m
m-series tests
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What do members want from QEMU IoT support
PrioritiesUse cases?Hardware?Other requirements?
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Some options for new M-pro�le board?
Cortex-M0number of built-in peripheralswidespread real hardware
Cortex-M4built in Bluetoothsupports Zephyr
BBC microBit
96boards Carbon
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Thank You#BUD17
For further information: www.linaro.org
BUD17 keynotes and videos on: connect.linaro.org
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