[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Maintainers, please tell us how to boot your machines!
|
From: |
sundeep subbaraya |
|
Subject: |
Re: [Qemu-devel] Maintainers, please tell us how to boot your machines! |
|
Date: |
Thu, 18 Apr 2019 13:46:51 +0530 |
Hi,
On Wed, Mar 13, 2019 at 6:36 AM Philippe Mathieu-Daudé <address@hidden> wrote:
>
> '
> On Tue, Mar 12, 2019 at 6:44 PM Markus Armbruster <address@hidden> wrote:
> >
> > Dear board code maintainers,
> >
> > This is a (rather late) follow-up to the last QEMU summit. Minutes[*]:
> >
> > * Deprecating unmaintained features (devices, targets, backends) in QEMU
> >
> > QEMU has a mechanism to deprecate features but there remains a lot of
> > old unmaintained code. Refactoring is hindered by untested legacy
> > code, so there is a desire to deprecate unmaintained features more
> > often.
> >
> > [...]
> >
> > We should require at least a minimal test for each board; if nobody
> > cares enough to come up with one, that board should be deprecated.
> >
> > [...]
> >
[...]
> >
> > = hw/arm/msf2-som.c =
> > Subbaraya Sundeep <address@hidden> (maintainer:Emcraft M2S-FG484)
> > Peter Maydell <address@hidden> (maintainer:Emcraft M2S-FG484)
> > address@hidden (open list:ARM)
>
> ./arm-softmmu/qemu-system-arm -M emcraft-sf2 -serial mon:stdio \
> -kernel u-boot.bin -display none -drive file=spi.bin,if=mtd,format=raw
>
> Binaries u-boot.bin and spi.bin are at:
> https://github.com/Subbaraya-Sundeep/qemu-test-binaries.git
> Sources:
> https://github.com/Subbaraya-Sundeep/emcraft-uboot-sf2.git
> https://github.com/Subbaraya-Sundeep/linux.git
>
These should work as is since nothing changed.
Thanks Philippe.
Sundeep
> >
> > = hw/arm/musca.c =
> > Peter Maydell <address@hidden> (maintainer:Musca)
> > address@hidden (open list:Musca)
> >
> > = hw/arm/netduino2.c =
> > Alistair Francis <address@hidden> (maintainer:Netduino 2)
> > Peter Maydell <address@hidden> (maintainer:Netduino 2)
> > address@hidden (open list:ARM)
> >
> > = hw/arm/omap_sx1.c =
> > Peter Maydell <address@hidden> (maintainer:OMAP)
> > address@hidden (open list:ARM)
> >
> > = hw/arm/realview.c =
> > Peter Maydell <address@hidden> (maintainer:Real View)
> > address@hidden (open list:Real View)
> >
> > = hw/arm/stellaris.c =
> > Peter Maydell <address@hidden> (maintainer:Stellaris)
> > address@hidden (open list:Stellaris)
>
> https://docs.zephyrproject.org/1.13.0/boards/arm/qemu_cortex_m3/doc/board.html
>
> > = hw/arm/versatilepb.c =
> > Peter Maydell <address@hidden> (maintainer:Versatile PB)
> > address@hidden (open list:Versatile PB)
>
> https://people.debian.org/~aurel32/qemu/armel/
>
> > = hw/arm/vexpress.c =
> > Peter Maydell <address@hidden> (maintainer:Versatile Express)
> > address@hidden (open list:Versatile Express)
>
> https://people.debian.org/~aurel32/qemu/armhf/
>
> > = hw/arm/virt.c =
> > Peter Maydell <address@hidden> (maintainer:Virt)
> > address@hidden (open list:Virt)
> >
> > = hw/arm/xilinx_zynq.c =
> > "Edgar E. Iglesias" <address@hidden> (maintainer:Xilinx Zynq)
> > Alistair Francis <address@hidden> (maintainer:Xilinx Zynq)
> > Peter Maydell <address@hidden> (maintainer:Xilinx Zynq)
> > address@hidden (open list:Xilinx Zynq)
> >
> > = hw/arm/xlnx-versal-virt.c =
> > Alistair Francis <address@hidden> (maintainer:Xilinx ZynqMP)
> > "Edgar E. Iglesias" <address@hidden> (maintainer:Xilinx ZynqMP)
> > Peter Maydell <address@hidden> (maintainer:Xilinx ZynqMP)
> > address@hidden (open list:Xilinx ZynqMP)
> >
> > = hw/arm/xlnx-zcu102.c =
> > Alistair Francis <address@hidden> (maintainer:Xilinx ZynqMP)
> > "Edgar E. Iglesias" <address@hidden> (maintainer:Xilinx ZynqMP)
> > Peter Maydell <address@hidden> (maintainer:Xilinx ZynqMP)
> > address@hidden (open list:Xilinx ZynqMP)
> >
> > = hw/cris/axis_dev88.c =
> > "Edgar E. Iglesias" <address@hidden> (maintainer:Axis Dev88)
> >
> > = hw/hppa/machine.c =
> > Richard Henderson <address@hidden> (maintainer:HPPA (PA-RISC))
> > Helge Deller <address@hidden> (reviewer:Dino)
> >
> > = hw/i386/pc_piix.c =
> > Paolo Bonzini <address@hidden> (maintainer:X86)
> > Richard Henderson <address@hidden> (maintainer:X86)
> > Eduardo Habkost <address@hidden> (maintainer:X86)
> > "Michael S. Tsirkin" <address@hidden> (supporter:PC)
> > Marcel Apfelbaum <address@hidden> (supporter:PC)
> >
> > = hw/i386/pc_q35.c =
> > "Michael S. Tsirkin" <address@hidden> (supporter:PC)
> > Marcel Apfelbaum <address@hidden> (supporter:PC)
> > Paolo Bonzini <address@hidden> (maintainer:X86)
> > Richard Henderson <address@hidden> (maintainer:X86)
> > Eduardo Habkost <address@hidden> (maintainer:X86)
> >
> > = hw/lm32/lm32_boards.c =
> > Michael Walle <address@hidden> (maintainer:LM32)
> >
> > = hw/lm32/milkymist.c =
> > Michael Walle <address@hidden> (maintainer:milkymist)
> >
> > = hw/microblaze/petalogix_ml605_mmu.c =
> > "Edgar E. Iglesias" <address@hidden> (maintainer:petalogix_ml605)
> >
> > = hw/microblaze/petalogix_s3adsp1800_mmu.c =
> > "Edgar E. Iglesias" <address@hidden> (maintainer:petalogix_s3adsp1800)
> >
> > = hw/microblaze/xlnx-zynqmp-pmu.c =
> > Alistair Francis <address@hidden> (maintainer:Xilinx ZynqMP)
> > "Edgar E. Iglesias" <address@hidden> (maintainer:Xilinx ZynqMP)
> > Peter Maydell <address@hidden> (maintainer:Xilinx ZynqMP)
> > address@hidden (open list:Xilinx ZynqMP)
> >
> > = hw/mips/boston.c =
> > Paul Burton <address@hidden> (maintainer:Boston)
> > Aleksandar Rikalo <address@hidden> (reviewer:Boston)
> > Aurelien Jarno <address@hidden> (maintainer:MIPS)
> > Aleksandar Markovic <address@hidden> (maintainer:MIPS)
>
> See:
> https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg03419.html
>
> linux-v4.17$ make ARCH=mips CROSS_COMPILE=mipsel-linux-gnu- 64r2el_defconfig
> qemu-system-mips64el -M boston -kernel arch/mips/boot/vmlinux.gz.itb
> -serial stdio
>
> > = hw/mips/mips_fulong2e.c =
> > Aleksandar Markovic <address@hidden> (odd fixer:Fulong 2E)
> > Aleksandar Rikalo <address@hidden> (reviewer:Fulong 2E)
> > Aurelien Jarno <address@hidden> (maintainer:MIPS)
>
> Linux fuloong2e_defconfig
>
> qemu-system-mips64el -machine fulong2e -kernel vmlinux -append
> 'console=ttyS0' -nographic -m 1G -serial stdio
>
> prebuilt images: http://acksyn.org/posts/2015/06/running-fedora-mips/
>
> > = hw/mips/mips_jazz.c =
> > "Hervé Poussineau" <address@hidden> (maintainer:Jazz)
> > Aleksandar Rikalo <address@hidden> (reviewer:Jazz)
> > Aurelien Jarno <address@hidden> (maintainer:MIPS)
> > Aleksandar Markovic <address@hidden> (maintainer:MIPS)
> >
> > = hw/mips/mips_malta.c =
> > Aurelien Jarno <address@hidden> (maintainer:Malta)
> > Aleksandar Rikalo <address@hidden> (reviewer:Malta)
> > Aleksandar Markovic <address@hidden> (maintainer:MIPS)
>
> https://people.debian.org/~aurel32/qemu/mips/ =)
>
> > = hw/mips/mips_mipssim.c =
> > Aleksandar Markovic <address@hidden> (odd fixer:Mipssim)
> > Aleksandar Rikalo <address@hidden> (reviewer:Mipssim)
> > Aurelien Jarno <address@hidden> (maintainer:MIPS)
>
> See this thread:
> http://lists.nongnu.org/archive/html/qemu-devel/2018-04/msg04071.html
>
> > = hw/mips/mips_r4k.c =
> > Aurelien Jarno <address@hidden> (maintainer:R4000)
> > Aleksandar Rikalo <address@hidden> (reviewer:R4000)
> > Aleksandar Markovic <address@hidden> (maintainer:MIPS)
> >
> > = hw/moxie/moxiesim.c =
> > Anthony Green <address@hidden> (maintainer:Moxie)
> >
> > = hw/nios2/10m50_devboard.c =
> > Chris Wulff <address@hidden> (maintainer:NiosII)
> > Marek Vasut <address@hidden> (maintainer:NiosII)
> >
> > = hw/openrisc/openrisc_sim.c =
> > Jia Liu <address@hidden> (maintainer:or1k-sim)
> > Stafford Horne <address@hidden> (odd fixer:OpenRISC)
> >
> > = hw/ppc/pnv.c =
> > David Gibson <address@hidden> (maintainer:PowerPC)
> > address@hidden (open list:PowerPC)
> >
> > = hw/ppc/prep.c =
> > "Hervé Poussineau" <address@hidden> (maintainer:PReP)
> > David Gibson <address@hidden> (maintainer:PowerPC)
> > address@hidden (open list:PReP)
>
> https://cdimage.debian.org/cdimage/archive/8.10.0/powerpc/iso-cd/
>
> qemu-system-ppc -M prep -cdrom debian-LennyBeta2-powerpc-netinst.iso
> -nographic
>
> > = hw/ppc/sam460ex.c =
> > BALATON Zoltan <address@hidden> (maintainer:sam460ex)
> > David Gibson <address@hidden> (maintainer:PowerPC)
> > address@hidden (open list:sam460ex)
>
> images:
> http://aros.sourceforge.net/nightly1.php
>
> > = hw/ppc/virtex_ml507.c =
> > "Edgar E. Iglesias" <address@hidden> (odd fixer:virtex_ml507)
> > David Gibson <address@hidden> (maintainer:PowerPC)
> > address@hidden (open list:virtex_ml507)
> >
> > = hw/s390x/s390-virtio-ccw.c =
> > Cornelia Huck <address@hidden> (supporter:S390 Virtio-ccw)
> > Halil Pasic <address@hidden> (supporter:S390 Virtio-ccw)
> > Christian Borntraeger <address@hidden> (supporter:S390 Virtio-ccw)
> > Richard Henderson <address@hidden> (maintainer:S390)
> > David Hildenbrand <address@hidden> (maintainer:S390)
> > address@hidden (open list:S390 Virtio-ccw)
> >
> > = hw/sh4/r2d.c =
> > Magnus Damm <address@hidden> (maintainer:R2D)
> > Aurelien Jarno <address@hidden> (odd fixer:SH4)
>
> https://people.debian.org/~aurel32/qemu/sh4/
> see also "acceptance: Add test_sh4_r2d in BootLinuxConsole":
> https://lists.gnu.org/archive/html/qemu-devel/2018-10/msg02748.html
>
> > = hw/sparc/leon3.c =
> > Fabien Chouteau <address@hidden> (maintainer:Leon3)
> > Mark Cave-Ayland <address@hidden> (maintainer:SPARC)
> > Artyom Tarasenko <address@hidden> (maintainer:SPARC)
>
> built uboot + uImage
> http://www.gaisler.com/anonftp/u-boot/examples/grxc3s1500/
>
> how to build more recent:
> https://vlsiwiki.soe.ucsc.edu/index.php/MASC/uCLinux_On_LEON3
>
> > = hw/sparc/sun4m.c =
> > Mark Cave-Ayland <address@hidden> (maintainer:Sun4m)
> > Artyom Tarasenko <address@hidden> (maintainer:SPARC)
>
> https://people.debian.org/~aurel32/qemu/sparc/
>
> >
> > = hw/sparc64/niagara.c =
> > Artyom Tarasenko <address@hidden> (maintainer:Sun4v)
> > Mark Cave-Ayland <address@hidden> (maintainer:SPARC)
> >
> > = hw/sparc64/sun4u.c =
> > Mark Cave-Ayland <address@hidden> (maintainer:Sun4u)
> > Artyom Tarasenko <address@hidden> (maintainer:SPARC)
> >
> > = hw/tricore/tricore_testboard.c =
> > Bastian Koppelmann <address@hidden> (maintainer:TriCore)
> >
> > = hw/unicore32/puv3.c =
> > Guan Xuetao <address@hidden> (maintainer:UniCore32)
> >
> > = hw/xtensa/sim.c =
> > Max Filippov <address@hidden> (maintainer:sim)
> >
> > = hw/xtensa/xtfpga.c =
> > Max Filippov <address@hidden> (maintainer:XTFPGA (LX60, LX2...)
>
> build Zephyr from source:
> http://docs.zephyrproject.org/boards/xtensa/qemu_xtensa/doc/board.html
>
> qemu-system-xtensa -M dc232b -m 128M -semihosting -nographic -monitor
> null -kernel Image.elf
>
> >
> > Machines with no maintainer, but at least one supporter:
> >
> > = hw/ppc/spapr.c =
> > David Gibson <address@hidden> (supporter:sPAPR)
> > address@hidden (open list:sPAPR)
> >
> > = hw/riscv/sifive_e.c =
> > Palmer Dabbelt <address@hidden> (supporter:RISC-V)
> > Alistair Francis <address@hidden> (supporter:RISC-V)
> > Sagar Karandikar <address@hidden> (supporter:RISC-V)
> > Bastian Koppelmann <address@hidden> (supporter:RISC-V)
> > address@hidden (open list:RISC-V)
> >
> > = hw/riscv/sifive_u.c =
> > Palmer Dabbelt <address@hidden> (supporter:RISC-V)
> > Alistair Francis <address@hidden> (supporter:RISC-V)
> > Sagar Karandikar <address@hidden> (supporter:RISC-V)
> > Bastian Koppelmann <address@hidden> (supporter:RISC-V)
> > address@hidden (open list:RISC-V)
> >
> > = hw/riscv/spike.c =
> > Palmer Dabbelt <address@hidden> (supporter:RISC-V)
> > Alistair Francis <address@hidden> (supporter:RISC-V)
> > Sagar Karandikar <address@hidden> (supporter:RISC-V)
> > Bastian Koppelmann <address@hidden> (supporter:RISC-V)
> > address@hidden (open list:RISC-V)
> >
> > = hw/riscv/virt.c =
> > Palmer Dabbelt <address@hidden> (supporter:RISC-V)
> > Alistair Francis <address@hidden> (supporter:RISC-V)
> > Sagar Karandikar <address@hidden> (supporter:RISC-V)
> > Bastian Koppelmann <address@hidden> (supporter:RISC-V)
> > address@hidden (open list:RISC-V)
> >
> > = hw/xenpv/xen_machine_pv.c =
> > Stefano Stabellini <address@hidden> (supporter:X86)
> > Anthony Perard <address@hidden> (supporter:X86)
> > Paul Durrant <address@hidden> (supporter:X86)
> > address@hidden (open list:X86)
> >
> > Machines with no maintainer and no supporter:
> >
> > = hw/arm/collie.c =
> > Peter Maydell <address@hidden> (odd fixer:Sharp SL-5500 (Co...)
> > address@hidden (open list:Sharp SL-5500 (Co...)
> >
> > = hw/arm/cubieboard.c =
> > Beniamino Galvani <address@hidden> (odd fixer:Allwinner-a10)
> > Peter Maydell <address@hidden> (odd fixer:Allwinner-a10)
> > address@hidden (open list:Allwinner-a10)
>
> https://romanrm.net/a10/qemu
> https://kashyapc.fedorapeople.org/arm/installing-Fedora-21-on-microSD-card-for-Cubietruck.txt
>
> > = hw/arm/digic_boards.c =
> > Antony Pavlov <address@hidden> (odd fixer:Canon DIGIC)
> > Peter Maydell <address@hidden> (odd fixer:Canon DIGIC)
> > address@hidden (open list:Canon DIGIC)
>
> canon-a1100-rom1.bin
> https://www.mail-archive.com/address@hidden/msg571908.html
>
> > = hw/arm/exynos4_boards.c =
> > Igor Mitsyanko <address@hidden> (odd fixer:Exynos)
> > Peter Maydell <address@hidden> (odd fixer:Exynos)
> > address@hidden (open list:Exynos)
> >
> > = hw/arm/gumstix.c =
> > Peter Maydell <address@hidden> (odd fixer:Gumstix)
> > "Philippe Mathieu-Daudé" <address@hidden> (reviewer:Gumstix)
> > address@hidden (open list:Gumstix)
>
> dd of=cflash.img bs=128k count=128 if=/dev/zerodd of=cflash.img
> bs=128k conv=notrunc if=/Downloads/u-boot-verdex-400-r1604.bin
> dd of=cflash.img bs=128k conv=notrunc seek=2
> if=Downloads/Angstrom-gumstix-basic-image-glibc-ipk-2007.9-test-20080512-gumstix-custom-connex.rootfs.jffs2
> dd of=cflash.img bs=128k conv=notrunc seek=120
> if=Downloads/uImage-2.6.21-r1-gumstix-custom-connex.bin
> qemu-system-arm -M connex -nographic -drive
> if=sd,cache=unsafe,file=cflash.img -pflash cflash.img
>
> >
> > = hw/arm/highbank.c =
> > Rob Herring <address@hidden> (odd fixer:Calxeda Highbank)
> > Peter Maydell <address@hidden> (odd fixer:Calxeda Highbank)
> > address@hidden (open list:Calxeda Highbank)
>
> vmlinuz from those links
> https://wiki.edubuntu.org/ARM/Server/Install/Calxeda
> https://en.opensuse.org/HCL:Highbank
> https://wiki.linaro.org/LEG/Engineering/Virtualization/Platform_Device_Passthrough_on_Midway
>
> >
> > = hw/arm/imx25_pdk.c =
> > Peter Maydell <address@hidden> (odd fixer:i.MX25 PDK)
> > Jean-Christophe Dubois <address@hidden> (reviewer:i.MX25 PDK)
> > address@hidden (open list:i.MX25 PDK)
> >
> > = hw/arm/kzm.c =
> > Peter Chubb <address@hidden> (odd fixer:i.MX31 (kzm))
> > Peter Maydell <address@hidden> (odd fixer:i.MX31 (kzm))
> > address@hidden (open list:i.MX31 (kzm))
> >
> > = hw/arm/mainstone.c =
> > Andrzej Zaborowski <address@hidden> (odd fixer:PXA2XX)
> > Peter Maydell <address@hidden> (odd fixer:PXA2XX)
> > address@hidden (open list:PXA2XX)
> >
> > = hw/arm/mcimx6ul-evk.c =
> > Peter Maydell <address@hidden> (odd fixer:MCIMX6UL EVK / i....)
> > Jean-Christophe Dubois <address@hidden> (reviewer:MCIMX6UL EVK / i....)
> > address@hidden (open list:MCIMX6UL EVK / i....)
> >
> > = hw/arm/mcimx7d-sabre.c =
> > Peter Maydell <address@hidden> (odd fixer:MCIMX7D SABRE / i...)
> > Andrey Smirnov <address@hidden> (reviewer:MCIMX7D SABRE / i...)
> > address@hidden (open list:MCIMX7D SABRE / i...)
> >
> > = hw/arm/musicpal.c =
> > Jan Kiszka <address@hidden> (odd fixer:Musicpal)
> > Peter Maydell <address@hidden> (odd fixer:Musicpal)
> > address@hidden (open list:Musicpal)
> >
> > = hw/arm/nseries.c =
> > Andrzej Zaborowski <address@hidden> (odd fixer:nSeries)
> > Peter Maydell <address@hidden> (odd fixer:nSeries)
> > address@hidden (open list:nSeries)
>
> images:
> http://stskeeps.subnetmask.net/meego-n8x0/
>
> $ qemu-system-arm -M n810 -kernel
> meego-arm-n8x0-1.0.80.20100712.1431-vmlinuz-2.6.35~rc4-129.1-n8x0
> -append "root=/dev/mmcblk0p1 console=ttyS0 printk.time=0 rootwait" -m
> 130 -sd meego-arm-n8x0-1.0.80.20100712.1431-sda.raw -serial stdio
>
> > = hw/arm/palm.c =
> > Andrzej Zaborowski <address@hidden> (odd fixer:Palm)
> > Peter Maydell <address@hidden> (odd fixer:Palm)
> > address@hidden (open list:Palm)
> >
> > = hw/arm/raspi.c =
> > Peter Maydell <address@hidden> (odd fixer:Raspberry Pi)
> > Andrew Baumann <address@hidden> (reviewer:Raspberry Pi)
> > "Philippe Mathieu-Daudé" <address@hidden> (reviewer:Raspberry Pi)
> > address@hidden (open list:Raspberry Pi)
>
> Quick Boot Linux uart test:
> https://lists.gnu.org/archive/html/qemu-devel/2019-03/msg04308.html
>
> >
> > = hw/arm/sabrelite.c =
> > Peter Maydell <address@hidden> (odd fixer:SABRELITE / i.MX6)
> > Jean-Christophe Dubois <address@hidden> (reviewer:SABRELITE / i.MX6)
> > address@hidden (open list:SABRELITE / i.MX6)
> >
> > = hw/arm/spitz.c =
> > Andrzej Zaborowski <address@hidden> (odd fixer:PXA2XX)
> > Peter Maydell <address@hidden> (odd fixer:PXA2XX)
> > address@hidden (open list:PXA2XX)
> >
> > = hw/arm/tosa.c =
> > Andrzej Zaborowski <address@hidden> (odd fixer:PXA2XX)
> > Peter Maydell <address@hidden> (odd fixer:PXA2XX)
> > address@hidden (open list:PXA2XX)
> >
> > = hw/arm/z2.c =
> > Andrzej Zaborowski <address@hidden> (odd fixer:PXA2XX)
> > Peter Maydell <address@hidden> (odd fixer:PXA2XX)
> > address@hidden (open list:PXA2XX)
> >
> > = hw/m68k/an5206.c =
> > Thomas Huth <address@hidden> (odd fixer:an5206)
> >
> > = hw/m68k/mcf5208.c =
> > Thomas Huth <address@hidden> (odd fixer:mcf5208)
> >
> > = hw/ppc/e500plat.c =
> > David Gibson <address@hidden> (odd fixer:e500)
> > address@hidden (open list:e500)
> >
> > = hw/ppc/mac_newworld.c =
> > Mark Cave-Ayland <address@hidden> (odd fixer:New World (mac99))
> > David Gibson <address@hidden> (reviewer:New World (mac99))
> > address@hidden (open list:New World (mac99))
> >
> > = hw/ppc/mac_oldworld.c =
> > Mark Cave-Ayland <address@hidden> (odd fixer:Old World (g3beige))
> > David Gibson <address@hidden> (reviewer:Old World (g3beige))
> > address@hidden (open list:Old World (g3beige))
> >
> > = hw/ppc/mpc8544ds.c =
> > David Gibson <address@hidden> (odd fixer:mpc8544ds)
> > address@hidden (open list:mpc8544ds)
> >
> > = hw/ppc/ppc405_boards.c =
> > David Gibson <address@hidden> (odd fixer:ppc4xx)
> > address@hidden (open list:ppc4xx)
> >
> > = hw/ppc/ppc440_bamboo.c =
> > David Gibson <address@hidden> (odd fixer:ppc4xx)
> > address@hidden (open list:ppc4xx)
> >
> > = hw/sh4/shix.c =
> > Magnus Damm <address@hidden> (odd fixer:Shix)
> > Aurelien Jarno <address@hidden> (odd fixer:SH4)
> >
> >
> > [*] Subject: QEMU Summit 2018 minutes
> > Message-ID: <address@hidden>
> > https://lists.nongnu.org/archive/html/qemu-devel/2018-11/msg03367.html