On Wed, 2021-08-11 at 09:04 +1000, Christoph Willing wrote:
> On 11/8/21 12:26 am, James Bottomley wrote:
> [...]
> > In the working kernel dmesg Gerd requested, what does it mount as
> > root? sda? In which case what does the kernel say about where it
> > got sda from?
> >
> Yes it mounts /dev/sda2 as root.
>
> The boot logs are are now attached at
> https://bugzilla.tianocore.org/show_bug.cgi?id=3504 as well a diff
> between good and bad boots (patched & unpatched code). There's
> nothing obvious (to me) as to why the unpatched code can't find the
> virtual disk.
>
> My simple minded guess is that PlatformBdsConnectSequence() performs
> some preparatory work that enables the kernel to have access to the
> vm (therefore to the virtual disk) by the time TryRunningQemuKernel()
> is called. At the moment however, TryRunningQemuKernel() is called
> before PlatformBdsConnectSequence() so that preparatory work hasn't
> been done and the disk can't be found.
I suspect the problem is that it no longer creates default devices if
you don't specify them. If I look at my working version of a command
line boot, it's this:
qemu-kvm \
-drive
if=pflash,format=raw,unit=0,file=/home/jejb/git/edk2/Build/OvmfX64/DEBUG_GCC5/FV/OVMF.fd,readonly
\
-debugcon file:debug.log -global isa-debugcon.iobase=0x402 \
-kernel bzImage \
-initrd initrd.img \
-append "console=ttyS0 rd.driver.pre=virtio_scsi,9p,9pnet_virtio
root=/dev/sda1" \
-m 2048 \
-serial stdio \
-drive if=none,id=sd00,file=debian.img,format=qcow2 \
-fsdev local,security_model=passthrough,id=modules,path=/tmp/lib/modules \
-fsdev local,security_model=passthrough,id=home,path=/home/jejb \
-device virtio-scsi-pci,id=scsi \
-device virtio-9p-pci,fsdev=modules,id=sd01,mount_tag=modules \
-device virtio-9p-pci,fsdev=home,id=sd02,mount_tag=home \
-device scsi-hd,bus=scsi.0,drive=sd00 \
-device e1000,netdev=net0 \
-netdev user,id=net0,hostfwd=tcp::5555-:22 \
-display vnc=:5 \
# -chardev socket,id=chrtpm,path=`pwd`/tpmdev/swtpm-sock \
# -tpmdev emulator,id=tpm0,chardev=chrtpm \
# -device tpm-tis,tpmdev=tpm0 \
You can ignore all the TPM stuff and my 9p pass throughs for home
directory and /tmp modules directory (to make it easy to boot any
kernel I build). The relevant lines for you are:
-drive if=none,id=sd00,file=debian.img,format=qcow2 \
-device virtio-scsi-pci,id=scsi \
-device scsi-hd,bus=scsi.0,drive=sd00 \
Which is how I connect /dev/sda to the qcow2 debian image I use to
boot. You have the drive line but no device lines giving the driver
... if you add device lines can you then get it to boot?
James
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