From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Nowicki Subject: Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions Date: Fri, 13 Jan 2017 14:59:16 +0100 Message-ID: References: <1484127714-3263-1-git-send-email-eric.auger@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Cc: drjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, punit.agrawal-5wv7dgnIgG8@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, geethasowjanya.akula-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, pranav.sawargaonkar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, shankerd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, gpkulkarni-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org To: Eric Auger , eric.auger.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, marc.zyngier-5wv7dgnIgG8@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org, alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Return-path: In-Reply-To: <1484127714-3263-1-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org List-Id: kvm.vger.kernel.org Hello Eric, On 11.01.2017 10:41, Eric Auger wrote: > Following LPC discussions, we now report reserved regions through > the iommu-group sysfs reserved_regions attribute file. > > Reserved regions are populated through the IOMMU get_resv_region > callback (former get_dm_regions), now implemented by amd-iommu, > intel-iommu and arm-smmu: > - the intel-iommu reports the [0xfee00000 - 0xfeefffff] MSI window > as a reserved region and RMRR regions as direct-mapped regions. > - the amd-iommu reports device direct mapped regions, the MSI region > and HT regions. > - the arm-smmu reports the MSI window (arbitrarily located at > 0x8000000 and 1MB large). > > Unsafe interrupt assignment is tested by enumerating all MSI irq > domains and checking MSI remapping is supported in the above hierarchy. > This check is done in case we detect the iommu translates MSI > (an IOMMU_RESV_MSI window exists). Otherwise the IRQ remapping > capability is checked at IOMMU level. Obviously this is a defensive > IRQ safety assessment: Assuming there are several MSI controllers > in the system and at least one does not implement IRQ remapping, > the assignment will be considered as unsafe (even if this controller > is not acessible from the assigned devices). > > The series first patch stems from Robin's branch: > http://linux-arm.org/git?p=linux-rm.git;a=shortlog;h=refs/heads/iommu/misc > > Best Regards > > Eric > > Git: complete series available at > https://github.com/eauger/linux/tree/v4.10-rc3-reserved-v8 I tested the series on ThunderX with internal 10G VNIC and Intel IXGBE NIC. Please feel free to add my: Tested-by: Tomasz Nowicki Thanks, Tomasz