On 03.09.20 15:07, Jan-Marc Stranz wrote:
> Hi Jan!
>
> I've moved to another target with "Intel Core i7-8559U".
> This CPU supports "VT-x" and "VT-d".
>
> Doing a hardware check I get the following messages:
>
> Feature Availability
> ------------------------------ ------------------
> Number of CPUs > 1 ok
> Long mode ok
> Traceback (most recent call last):
> File "/usr/libexec/jailhouse/jailhouse-hardware-check", line 147, in
> <module>
> iommu, _ = sysfs_parser.parse_dmar(pci_devices, ioapics, dmar_regions)
> File "/usr/lib/python3.7/site-packages/pyjailhouse/sysfs_parser.py",
> line 377, in parse_dmar
> raise RuntimeError('DMAR region size cannot be identified.\n'
> RuntimeError: DMAR region size cannot be identified.
> Target Linux must run with Intel IOMMU enabled.
>
> I'm using Linux Kernel 5.4.61 with the patches and config options from
> "jailhouse.cfg".
>
> The kernel command line contains "intel_iommu=off" (as specified under
> "Software requirements" at https://github.com/siemens/jailhouse).
> I've also tried "intel_iommu=on" but without success.
>
> What is the reason for this again?
I could be that your kernel does not support what is needed to check the
hardware. It may still be fine to run Jailhouse. Do not invest too much
into the checker - or use a regular distro kernel for the check (which
may also partially fail these days due to CONFIG_STRICT_DEVMEM).
> It's very difficult (at least for me) to get jailhouse up and running.
Focus on the configuration, not the checking. In fact, the checker has a
decreasing value because (x86) hardware shipped in 2020 has all features
we need, practically always.
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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