Hello,
I've properly built Jailhouse Images and got Jailhouse running in QEMU with
qemu-x86.cell running as the root cell and ivshmem-demo.cell running as the
inmate. I'm able to establish a shared memory connection over PCI, like so:
Shared memory connection established: "ivshmem-demo" <--> "QEMU-VM"
Created cell "ivshmem-demo"
Page pool usage after cell creation: mem 291/974, remap 65543/131072
Cell "ivshmem-demo" can be loaded
Started cell "ivshmem-demo"
CPU 2 received SIPI, vector 100
IVSHMEM: Found 1af4:1110 at 00:0f.0
IVSHMEM: shmem is at 0x000000003f1ff000
IVSHMEM: bar0 is at 0x000000003f200000
IVSHMEM: bar2 is at 0x000000003f201000
IVSHMEM: mapped the bars got position 1
IVSHMEM: 00:0f.0 sending IRQ
IVSHMEM: 00:0f.0 sending IRQ
IVSHMEM: 00:0f.0 sending IRQ
...
So now, it's just a matter of loading a device driver kernel module in the QEMU
root cell that can read from the vshmem PCI device, right? Then will I be able
to see the "Hello From IVSHMEM " output from the vshmem-demo inmate?
I've read Documentation/inter-cell-communication.txt and tried building the
uio_vshmem.c kernel module from
https://github.com/henning-schild-work/ivshmem-guest-code. However, I am
getting these errors:
`WARNING: "__uio_register_device"
[/root/ivshmem-guest-code/kernel_module/uio/uio_ivshmem.ko] undefined!`
`WARNING: "uio_unregister_device"
[/root/ivshmem-guest-code/kernel_module/uio/uio_ivshmem.ko] undefined!`
So naturally, this also fails:
$ insmod uio_ivshmem.ko
$ insmod: ERROR: could not insert module uio_ivshmem.ko: Uknown symbol in
module
Now, I already have the kernel headers installed from the Jailhouse Images
output, so that I can properly build Jailhouse and other kernel modules inside
the QEMU image (see
https://groups.google.com/d/msg/jailhouse-dev/hV-5AkuZqbg/0s6IvAFoGgAJ).
Make seems to find the linux headers just fine (they are at 4.14.73). But I'm
confused: why won't it build? Shouldn't the UIO stuff be there? Do the kernel
configs need to be altered? I see this:
$ zcat /proc/config.gz | grep -i uio
# CONFIG_UIO is not set
However, this builds fine on my Kubuntu 18.04 machine, and I see:
$ less /boot/config-4.15.0-29-generic | grep -i uio
CONFIG_UIO=m
CONFIG_UIO_CIF=m
CONFIG_UIO_PDRV_GENIRQ=m
CONFIG_UIO_DMEM_GENIRQ=m
CONFIG_UIO_AEC=m
CONFIG_UIO_SERCOS3=m
CONFIG_UIO_PCI_GENERIC=m
CONFIG_UIO_NETX=m
CONFIG_UIO_PRUSS=m
CONFIG_UIO_MF624=m
CONFIG_UIO_HV_GENERIC=m
CONFIG_COMEDI_PCMUIO=m
At this point, it almost seems easier to figure out how to create an actual
simple PCI driver from scratch than to get this to work with the UIO framework,
since I can't find hardly any documentation on UIO... Also, I'm not very
excited about rebuilding the Linux kernel. But if there is a quick fix, I'm all
ears.
Thanks for the help!
Michael
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