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Subject: Re: [virtio-dev] Re: [PATCH V2 2/2] virtio-pci: add PASID configuration extended capability
On Mon, Jan 17, 2022 at 01:57:47PM +0800, Jason Wang wrote: > How about something like: > > " > Except for the MSI transactions, the device MUST use PASID TLP prefix > for the following memory transactions initiated by the virtqueue that > belong to a virtqueue group if a valid PASID is assigned and PASID is > enabled in the PASID extended capability: > > \begin{itemize} > \item Memory Requests (including AtomicOp Requests) with Untranslated > Addresses > \item Address Translation Requests > \item Page Request Messages > \end{itemize} > > The device MUST NOT use PASID TLP prefix for the MSI memory > transactions. > Sure, that looks good. Maybe splitting it would make it easier to explain. If we force the driver to enable the PASID cap before using PASID: "The driver MUST NOT assign a PASID to a virtqueue group if the PASID extended capability is not enabled." Then the device description is not concerned about the PASID cap: "If a valid PASID is assigned to a virtqueue group, the device MUST use a PASID TLP prefix for memory transactions of the following types initiated by any virtqueue in the group: ... The device MUST NOT use a PASID TLP prefix for MSI memory transactions. " Thanks, Jean
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