Hi Joerg, > -----Original Message----- > From: Joerg Roedel <j...@8bytes.org> > Sent: Thursday, May 14, 2020 11:33 AM > To: Prakhya, Sai Praneeth <sai.praneeth.prak...@intel.com> > Cc: iommu@lists.linux-foundation.org; Lu Baolu <baolu...@linux.intel.com> > Subject: Re: [PATCH] iommu: Remove functions that support private domain > > On Thu, May 14, 2020 at 05:51:39PM +0000, Prakhya, Sai Praneeth wrote: > > Sorry! didn't get that quite well. When you meant "per-group > > default-domain patch-set", do you mean the patch set that I am working > > on which changes iommu group default domain dynamically by writing to > > sysfs file? > > Not only the sysfs file, but also changing it at boot already. Note that > changing > the default-domain at runtime is only possible for single-device groups.
Could you please explain why we shouldn't change default-domain for an iommu group that has multiple devices? I am asking this particularly because the patch set I am working on allows to change default-domain for an iommu group that has multiple devices. The pre-requisite being that all the devices in the group should already be unbounded from the device driver and the default-domain preferences of all the devices in the group shouldn't have conflicting types i.e. some devices cannot say they *only* need identity domain while other devices in the same group say that they *only* need to be in DMA domain. In this case, we will not be able to decide upon a default-domain for the iommu group. > I'll queue that patch tomorrow. Great! I will take a look at it. Regards, Sai _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
