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

[Auger Eric]

Hi Ciro, Nerijus,

On 08/11/2018 01:43 AM, Ciro Santilli wrote:
> 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. 

Please try to use -machine virt,highmem=off

your 32b FW most likely does not support highmem ECAM.

Thanks

Eric
> 
> On Fri, Aug 10, 2018 at 11:02 AM, Nerijus Baliunas
> <address@hidden <mailto:address@hidden>>
> wrote:
> 
>     On Thu, 9 Aug 2018 22:59:27 +0100 Ciro Santilli
>     <address@hidden <mailto: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.