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.

Jan

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

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