Re: [Qemu-discuss] qemu-system-arm -M virt v3.0.0-rc4 Linux kernel virtio boots fails with VFS: Cannot open root device "vda"

[Ciro Santilli]

Bisected to 17ec075a651a3f9613429c2d97018fce459ed943 hw/arm/virt: Use 256MB
ECAM region by default

@Eric: do you know what might be the best fix for me?

Just replacing `-M virt` with `-M virt-3.0` did not solve the problem.

On Fri, Aug 10, 2018 at 11:02 AM, Nerijus Baliunas <
address@hidden> wrote:

> On Thu, 9 Aug 2018 22:59:27 +0100 Ciro Santilli <address@hidden>
> wrote:
>
> > Analogous commands work for x86_64 and aarch64
> >
> > All worked on v2.12.0 with the same images.
>
> > Kernel boot error message:
> > VFS: Cannot open root device "vda" or unknown-block(0,0): error -6
>
> I have just tried to boot my armv7l virt-3.0 VM, which has root on
> /dev/vda3, and it boots
> successfully with 3.0.0-rc4. One is configured as Direct kernel boot and
> has
> Kernel args: console=ttyAMA0 rw root=UUID=00d450fb-138b-4faa-b2d2-c6c79950fb56
> rootwait
> (IIRC I had to add root=UUID= option about 2 years ago, it booted w/o it
> before),
> and another is UEFI. I use libvirt, command lines for both are:
>
> /usr/bin/qemu-system-arm -name guest=fedora28-arm,debug-threads=on -S
> -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/
> qemu/domain-7-fedora28-arm/master-key.aes -machine
> virt-3.0,accel=tcg,usb=off,dump-guest-core=off -m 2048 -realtime
> mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 
> 1afe58e9-f943-4ffe-889c-a3a6a4687937
> -display none -no-user-config -nodefaults -chardev
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-7-
> fedora28-arm/monitor.sock,server,nowait -mon 
> chardev=charmonitor,id=monitor,mode=control
> -rtc base=utc -no-shutdown -boot strict=on -kernel /var/lib/libvirt/images/
> vmlinuz-4.17.12-200.fc28.armv7hl -initrd /var/lib/libvirt/images/
> initramfs-4.17.12-200.fc28.armv7hl.img -append console=ttyAMA0 rw
> root=UUID=00d450fb-138b-4faa-b2d2-c6c79950fb56  rootwait -device
> i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1 -device
> pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 -drive
> file=/var/lib/libvirt/images/Fedora-Server-armhfp-22-TC4-
> sda.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device
> virtio-blk-device,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
> -netdev tap,fd=26,id=hostnet0 -device virtio-net-device,netdev=
> hostnet0,id=net0,mac=52:54:00:f1:3b:de -chardev pty,id=charserial0
> -serial chardev:charserial0 -msg timestamp=on
>
> /usr/bin/qemu-system-arm -name guest=fedora28-arm-uefi,debug-threads=on
> -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/
> qemu/domain-8-fedora28-arm-uefi/master-key.aes -machine
> virt-3.0,accel=tcg,usb=off,dump-guest-core=off -cpu cortex-a15 -drive
> file=/usr/share/edk2.git/arm/QEMU_EFI-pflash.raw,if=pflash,format=raw,unit=0,readonly=on
> -drive 
> file=/var/lib/libvirt/qemu/nvram/fedora28-arm-uefi_VARS.fd,if=pflash,format=raw,unit=1
> -m 2048 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid
> 1b721aaa-0d2b-48f8-9697-ccca9f361248 -display none -no-user-config
> -nodefaults -chardev socket,id=charmonitor,path=/
> var/lib/libvirt/qemu/domain-8-fedora28-arm-uefi/monitor.sock,server,nowait
> -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc
> -no-shutdown -boot strict=on -device virtio-serial-device,id=virtio-serial0
> -drive file=/var/lib/libvirt/images/Fedora-Server-armhfp-22-TC4-
> sda.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device
> virtio-blk-device,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
> -netdev tap,fd=26,id=hostnet0 -device virtio-net-device,netdev=
> hostnet0,id=net0,mac=52:54:00:f1:3b:de -chardev pty,id=charserial0
> -serial chardev:charserial0 -chardev socket,id=charchannel0,path=/
> var/lib/libvirt/qemu/channel/target/domain-8-fedora28-arm-
> uefi/org.qemu.guest_agent.0,server,nowait -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=
> charchannel0,id=channel0,name=org.qemu.guest_agent.0 -msg timestamp=on
>
> Regards,
> Nerijus
>
>
Thanks Nerijus, I will try to bisect the options.