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Re: [RFC PATCH 0/5] hw/arm/virt: Add support for user-creatable nested S
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From: |
Jason Gunthorpe |
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Subject: |
Re: [RFC PATCH 0/5] hw/arm/virt: Add support for user-creatable nested SMMUv3 |
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Date: |
Fri, 13 Dec 2024 08:43:46 -0400 |
On Fri, Dec 13, 2024 at 11:58:02AM +0000, Daniel P. Berrangé wrote:
> Libvirt does not rquire use of pcie-switch. It supports them, but in the
> absence of app requested configs, libvirt will always just populate
> pcie-root-port devices. switches are something that has to be explicitly
> asked for, and I don't see much need todo that.
If you are assigning all VFIO devices within a multi-device iommu
group there are good reasons to show the switch, and the switch has to
reflect certain ACS properties. We have some systems like this..
Jason