From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751902AbdAMN7Y (ORCPT ); Fri, 13 Jan 2017 08:59:24 -0500 Received: from mail-lf0-f53.google.com ([209.85.215.53]:33569 "EHLO mail-lf0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751698AbdAMN7X (ORCPT ); Fri, 13 Jan 2017 08:59:23 -0500 Subject: Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions To: Eric Auger , eric.auger.pro@gmail.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, linux-arm-kernel@lists.infradead.org References: <1484127714-3263-1-git-send-email-eric.auger@redhat.com> Cc: drjones@redhat.com, kvm@vger.kernel.org, punit.agrawal@arm.com, linux-kernel@vger.kernel.org, geethasowjanya.akula@gmail.com, diana.craciun@nxp.com, iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com, bharat.bhushan@nxp.com, shankerd@codeaurora.org, gpkulkarni@gmail.com From: Tomasz Nowicki Message-ID: Date: Fri, 13 Jan 2017 14:59:16 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <1484127714-3263-1-git-send-email-eric.auger@redhat.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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