On 2018-02-19 12:41, r.ravindran...@matellio.com wrote:
> All,
> I have two LAN ports in X86 and want to establish connection
> using Jailhouse root-cell & non-root-cell.
> host system : CENTOS linux 7
> root-cell : jan's 4.14.18 kernel
> non-root-cell : same but based for PCI device "0000:03:00.0"
> Did experimentation with above setup.
> One LAN (0000:03:00.1) port be used in root-cell,
> while other LAN port (0000:03:00.0) used in non-root-cell.
> created the non-root-cell config file based on the LAN device 0000:03:00.0.
> Did quite a few experimentation before reaching the crash.
> I am not able to proceed in debugging. Please help here.

Let's look at the boot log of Linux:

> [    0.122355] pci 0000:00:01.0: PCI bridge to [bus 01]
> [    0.127058] pci 0000:00:03.0: PCI bridge to [bus 02]
> FATAL: unsupported instruction (0x66 [0x00] 0x00 0x00)
> FATAL: Invalid MMIO/RAM read, addr: 0x0000000080300168 size: 0
> RIP: 0xffffffffa41f2d83 RSP: 0xffffa9538006bba0 FLAGS: 10282

So, the first FATAL is because Jailhouse is trying to handle MMIO that
is issued by an instruction sequence not understood by Jailhouse so far.
The accessed address is printed in the second FATAL line. That's right
inside the MMCFG region, and it is targeting the device 00:03.0 which is
legal according to the cell config.

OK, it seems your Linux kernel is accessing MMCFG via some unsupported
SSE2 mov instruction. Could you disassemble the non-root kernel around
0xffffffffa41f2d83, maybe also share your .config and compiler version?


Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

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