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Re: [Xen-devel] [PATCH] KVM: Start populating /sys/hypervisor with KVM entries
- To: Christian Borntraeger <borntraeger@xxxxxxxxxx>, Filippo Sironi <sironi@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Tue, 9 Oct 2018 12:21:46 -0400
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- Cc: vasu.srinivasan@xxxxxxxxxx, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
- Delivery-date: Tue, 09 Oct 2018 16:22:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/9/18 6:41 AM, Christian Borntraeger wrote:
>
>
> On 10/09/2018 11:54 AM, Filippo Sironi wrote:
>> Start populating /sys/hypervisor with KVM entries when we're running on
>> KVM. This is to replicate functionality that's available when we're
>> running on Xen.
>>
>> Let's start with /sys/hypervisor/uuid, which users prefer over
>> /sys/devices/virtual/dmi/id/product_uuid as a way to recognize a virtual
>> machine, since it's also available when running on Xen HVM and on Xen PV
>> and, on top of that doesn't require root privileges by default.
>
> Can you make this an arch hook? On s390 it is possible to get the uuid with
> the stsi instruction.
> See
> https://git.kernel.org/pub/scm/virt/kvm/kvm.git/tree/arch/s390/kernel/sysinfo.c#n248
>
>
> We do use uuid_t, but we can certainly return a char*.
I would suggest having a top-level sys-hypervisor.c that will create
common files that all hypervisors should have (uuid, type, version, etc)
and then have hypervisor- and/or arch-specific hooks.
-boris
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