Date: Thu, 29 Sep 2016 18:46:36 -0700 From: John Baldwin <john@baldwin.cx> To: src-committers@freebsd.org Cc: svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: Re: svn commit: r306472 - in stable/10/sys/amd64/vmm: . io Message-ID: <2182781.Bke7ZiohbR@ralph.baldwin.cx> In-Reply-To: <201609300142.u8U1gTWK092222@repo.freebsd.org> References: <201609300142.u8U1gTWK092222@repo.freebsd.org>
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On Friday, September 30, 2016 01:42:29 AM John Baldwin wrote: > Author: jhb > Date: Fri Sep 30 01:42:29 2016 > New Revision: 306472 > URL: https://svnweb.freebsd.org/changeset/base/306472 > > Log: > MFC 304858,305485: Fix various issues with PCI pass through and VT-d. > > 304858: > Enable I/O MMU when PCI pass through is first used. > > Rather than enabling the I/O MMU when the vmm module is loaded, > defer initialization until the first attempt to pass a PCI device > through to a guest. If the I/O MMU fails to initialize or is not > present, than fail the attempt to pass a PCI device through to a > guest. > > The hw.vmm.force_iommu tunable has been removed since the I/O MMU is > no longer enabled during boot. However, the I/O MMU support can be > disabled by setting the hw.vmm.iommu.enable tunable to 0 to prevent > use of the I/O MMU on any systems where it is buggy. > > 305485: > Leave ppt devices in the host domain when they are not attached to a VM. > > This allows a pass through device to be reset to a normal device driver > on the host and reused on the host. ppt devices are now always active in > some I/O MMU domain when the I/O MMU is active, either the host domain > or the domain of a VM they are attached to. I did not MFC 305497 (update I/O MMU when adding/removing PCI devices) since there was a conflict and neither SR-IOV nor PCI-e Hotplug are in 10 (though Cardbus is in 10). At this point I doubt I will get around to merging Hotplug to 10, but if I do then 305497 could be merged. -- John Baldwin
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