On 2016-09-19 09:41, Valentine Sinitsyn wrote:
> Hi everyone,
> 
> On 19.09.2016 11:48, Jan Kiszka wrote:
>> On 2016-09-19 08:45, Claudio Scordino wrote:
>>> Dear Jan, Valentine,
>>>
>>> 2016-09-16 19:57 GMT+02:00 Jan Kiszka <jan.kis...@siemens.com
>>> <mailto:jan.kis...@siemens.com>>:
>>>
>>>     On 2016-09-16 17:40, Claudio Scordino wrote:
>>>     > Dear all,
>>>     >
>>>     > when running
>>>     >
>>>     >       sudo jailhouse enable configs/qemu-vm.cell
>>>     >
>>>     > I get
>>>     >
>>>     >       JAILHOUSE_ENABLE: Invalid argument
>>>     >
>>>     > The tracing console says
>>>     >
>>>     >       hypervisor/arch/x86/amd_iommu.c:329: returning error -EINVAL
>>>     >
>>>     > meaning that the following condition fails:
>>>     >
>>>     >       327  /* Protect against accidental VT-d configs. */
>>>     >       328  if (!iommu->amd_bdf)
>>>     >
>>>     > Therefore, apparently I have misconfigured some setting about
>>> AMD IOMMU.
>>>     > However, looking at the documentation I have not found any
>>> AMD-specific setting.
>>>     >
>>>     >
>>>     > Here is some further information about my configuration:
>>>     >
>>>     > HOST:
>>>     >  - Linux distribution: Ubuntu 16.04.1 LTS
>>>     >  - Linux kernel: 4.4.0-36 x86_64
>>>     >  - Qemu version: 2.7.0
>>>     >
>>>     > GUEST:
>>>     >  - Linux distribution: Linux Mint 18 Sarah
>>>     >  - Linux kernel: 4.4.0-36 x86_64
>>>     >  - Kernel boot param: memmap=66M$0x3b000000
>>>     >  - Run through the following command: qemu-system-x86_64
>>> -machine q35 -m 1G -enable-kvm -smp 4 -cpu
>>> host,-kvm_pv_eoi,-kvm_steal_time,-kvm_asyncpf,-kvmclock,+x2apic -drive
>>>     file="Mint.vdi",id=disk,if=none -device ide-hd,drive=disk -serial
>>>     stdio -serial vc -s -net user,hostfwd=tcp::22222-:22 -net nic
>>>     >
>>>
>>>     First of all, there is no IOMMU configured in your qemu command
>>> line.
>>>
>>>
>>>
>>> I see. BTW, can you please tell me which specific Qemu argument I was
>>> missing ?
>>>
>>
>> -device intel-iommu - see README.
>>
>>>
>>>
>>>
>>>
>>>     But then the question is if you re running on an AMD host
>>> processor. The
>>>     qemu-vm.cell is pre-configured for an Intel VM with Intel IOMMU
>>>     (emulation).
>>>
>>>     AMD is a different beast. Patches for IOMMU emulation are on
>>> their way
>>>     upstream but not yet complete for use with Jailhouse. Moreover,
>>> KVM has
>>>     some bug (or more) when in comes to running Jailhouse as a guest.
>>> Fixing
>>>     this is long on my to-do list, but there is too much right now.
>>>
>>>     Long story short: better try on an Intel host when you want it
>>> inside
>>>     KVM. Running Jailhouse natively on AMD should be fine again (no
>>> known
>>>     issues ATM).
>>>
>>>
>>> I understand. Therefore, I'm going to use Intel.
>>>
>>> However, let me point out that the documentation
>>> at https://github.com/siemens/jailhouse is measleading as it says "The
>>> included system configuration *qemu-vm.c* can be used to run Jailhouse
>>> in QEMU/KVM virtual machine on x86 hosts (*Intel and AMD are
>>> supported*).".
>>
>> Yeah, indeed. We'll have to fix it, one way or the other.
> I feel, we should at least split Qemu configs for Intel and AMD-based
> hosts. It also makes sense to add some notes regrading issues related to
> nested virtualization to the README.

Agreed. Patches welcome.

Jan

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

-- 
You received this message because you are subscribed to the Google Groups 
"Jailhouse" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to jailhouse-dev+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Reply via email to