On 01.07.19 15:52, Ralf Ramsauer wrote:
On 7/1/19 3:09 PM, Jan Kiszka wrote:
On 01.07.19 14:59, Ralf Ramsauer wrote:
Hi,
On 6/27/19 9:06 AM, Jan Kiszka wrote:
On 25.06.19 19:25, Ralf Ramsauer wrote:
Hi,
for the completeness sake: it's about ivshmem-net. The PCI device shows
up in the root cell and can be discovered via lspci, but the driver
fails while probing with
[17061.414176] ivshmem-net 0000:00:01.0: enabling device (0000 -> 0002)
[17061.420598] ivshmem-net 0000:00:01.0: invalid IVPosition -1
The register read-out failed. Maybe a mismatch between driver and
Jailhouse version: Which revisions are you using on both sides?
siemens/4.19-rt vs. jailhouse/next. Should match.
The bar_mask was copied over from the qemu demo. Other than that, the
only thing that changed is the bdf. We simply chose a free one on our
system.
The memory region behin ivshmem is high memory above 32-bit. I
instrumented and checked the code, but that shouldn't be a problem.
This is rather related to the MMIO register access. Check if reading
that ID/IVPos register actually triggers a VM exit. I suspect it doesn't.
Hmm. Correct. I guess we should end up in ivshmem_register_mmio() but we
don't.
For bar0, jailhouse registers MMIO 0x380000000000. This is in sync with
the kernel:
[ 1416.878650] pci 0000:00:01.0: BAR 0: assigned [mem
0x380000000000-0x3800000000ff 64bit]
That's odd. Actually we should trap. Instrumentation of ivshmem-net
below gives me:
[ 2044.832898] regs location: 4080053db000
Huh? Shouldn't that be 0x380000000000?
What's "regs location"? What does "lspci -vv -s 0000:00:01.0" report?
Hmm 64-bit... FWIW, I'm going to remove that "feature" from future ivshmem
again, moving things back to 32-bit address space.
That said, this constellation may have triggered an issue in ivshmem or even the
MMIO dispatcher that wasn't visible so far.
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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