Messages in this thread | | | Subject | Re: [PATCH v1 1/1] iommu/vt-d: Enable PRI only if the device enables PASID. | From | sathyanarayanan kuppuswamy <> | Date | Thu, 7 Feb 2019 13:30:24 -0800 |
| |
On 2/7/19 1:15 PM, David Woodhouse wrote: > On Thu, 2019-02-07 at 13:09 -0800, Raj, Ashok wrote: >> You are right.. they are completely orthogonal. We just don't have >> a way to handle the page-requests for request without PASID's. >> >> There are some of the vIOMMU work to pass the PRI to who owns >> the device, and we can certainly relax it then. This is just to reflect >> what support exists today. FWIW, even the native driver maybe be able >> to resolve this if supported. > As things stand, if a device makes a PRI request without a PASID, it'll > get told that we didn't manage to bring the page in for it. Which is > true. > > What's the actual problem being fixed by this patch? Since the request is going to fail any way why go through the process of enabling it ? Once the functionality (PRI without PASID) is supported, then they can revert this patch. Just we are trying to expose whats currently supported clearly. > Yes, we're going > to want to hook up a way to pass the PRI to the right place... but why > add *another* thing that's just going to have to be fixed, by reverting > this patch? > -- Sathyanarayanan Kuppuswamy Linux kernel developer
| |