From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751331AbdAPJJb (ORCPT ); Mon, 16 Jan 2017 04:09:31 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37730 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750958AbdAPJHy (ORCPT ); Mon, 16 Jan 2017 04:07:54 -0500 Subject: Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions To: Tomasz Nowicki , 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: Auger Eric Message-ID: Date: Mon, 16 Jan 2017 10:07:46 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 16 Jan 2017 09:07:54 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Tomasz, On 13/01/2017 14:59, Tomasz Nowicki wrote: > 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 Many thanks! Eric > > Thanks, > Tomasz > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel