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From: Alex Williamson <alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Auger Eric <eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	drjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	punit.agrawal-5wv7dgnIgG8@public.gmane.org,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	 Jason Cooper <jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org>,
	  <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	diana.craciun-3arQi8VN3Tc@public.gmane.org,  iommu@lists.,
	Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org>,
	 Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
	 "@mail.linuxfoundation.org,
	tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org,
	" <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	 Ganapatrao Kulkarni
	<gpkulkarni-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	 christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
	eric.auger.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"@mail.linuxfoundation.org
Subject: Re: [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions
Date: Wed, 30 Nov 2016 07:14:17 -0700	[thread overview]
Message-ID: <20161130071417.3fc4357d@t450s.home> (raw)
In-Reply-To: <3d0ddb50-6e63-3fe2-55c0-ce49579905c9-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On Wed, 30 Nov 2016 11:14:22 +0100
Auger Eric <eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:

> Hi Ganapat,
> 
> On 30/11/2016 11:04, Ganapatrao Kulkarni wrote:
> > Hi Eric,
> > 
> > in you repo "https://github.com/eauger/linux/tree/v4.9-rc5-reserved-rfc-v3"
> > there is 11th patch "pci: Enable overrides for missing ACS capabilities"
> > is this patch part of some other series?  
> 
> Actually this is a very old patch from Alex aimed at working around lack
> of PCIe ACS support: https://lkml.org/lkml/2013/5/30/513

This patch is not destined for upstream, be very cautious relying on
it.  Hardware vendors need to be aware that lack of ACS imposes usage
restrictions.  Allowing users to arbitrarily override isolation for
various components is not supportable.  Quirks can be used to expose
isolation where it exists, but is not described by ACS.  Where
isolation does not exist, this patch is unsafe.  Thanks,

Alex

  parent reply	other threads:[~2016-11-30 14:14 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-15 13:09 [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions Eric Auger
2016-11-15 13:09 ` [RFC v3 04/10] iommu: iommu_alloc_resv_region Eric Auger
     [not found]   ` <1479215363-2898-5-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-29 16:11     ` Joerg Roedel
     [not found]       ` <20161129161128.GI2078-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-11-30  9:41         ` Auger Eric
2016-12-06 17:30     ` Robin Murphy
     [not found] ` <1479215363-2898-1-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-15 13:09   ` [RFC v3 01/10] iommu/dma: Allow MSI-only cookies Eric Auger
2016-11-15 13:09   ` [RFC v3 02/10] iommu: Rename iommu_dm_regions into iommu_resv_regions Eric Auger
     [not found]     ` <1479215363-2898-3-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-06 17:30       ` Robin Murphy
2016-11-15 13:09   ` [RFC v3 03/10] iommu: Add new reserved IOMMU attributes Eric Auger
     [not found]     ` <1479215363-2898-4-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-06 17:28       ` Robin Murphy
2016-11-15 13:09   ` [RFC v3 05/10] iommu: Do not map reserved regions Eric Auger
     [not found]     ` <1479215363-2898-6-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-06 17:36       ` Robin Murphy
     [not found]         ` <fff44f65-d9a6-1e35-97cd-997b92d2fce3-5wv7dgnIgG8@public.gmane.org>
2016-12-07 15:15           ` Auger Eric
2016-11-15 13:09   ` [RFC v3 06/10] iommu: iommu_get_group_resv_regions Eric Auger
     [not found]     ` <1479215363-2898-7-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-06 18:13       ` Robin Murphy
     [not found]         ` <8eb9662b-d677-546c-feb8-32fe5bd624f2-5wv7dgnIgG8@public.gmane.org>
2016-12-07 15:13           ` Auger Eric
2016-11-15 13:09   ` [RFC v3 07/10] iommu: Implement reserved_regions iommu-group sysfs file Eric Auger
2016-11-15 13:09   ` [RFC v3 08/10] iommu/vt-d: Implement reserved region get/put callbacks Eric Auger
2016-11-15 13:09   ` [RFC v3 09/10] iommu/arm-smmu: " Eric Auger
     [not found]     ` <1479215363-2898-10-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-06 18:55       ` Robin Murphy
     [not found]         ` <02c0ce15-fa67-e65f-3a4e-f543cc9fd3b8-5wv7dgnIgG8@public.gmane.org>
2016-12-07 15:02           ` Auger Eric
     [not found]             ` <c11755b8-4fb3-3f2f-d0b2-e688a5f8a6b6-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-07 18:24               ` Robin Murphy
     [not found]                 ` <5de00158-c82d-6b47-cf64-d4ba0183868d-5wv7dgnIgG8@public.gmane.org>
2016-12-08  7:57                   ` Auger Eric
2016-11-15 13:09   ` [RFC v3 10/10] vfio/type1: Get MSI cookie Eric Auger
2016-11-18  5:34   ` [RFC v3 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions Bharat Bhushan
2016-11-18  8:33     ` Auger Eric
2016-11-30  9:49   ` Auger Eric
2016-11-30 10:04     ` Ganapatrao Kulkarni
     [not found]       ` <CAFpQJXWp5BfsxU5nkWm7hrq5wp6=b-6iYVHjBQYhmkWN_kSSzg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-30 10:14         ` Auger Eric
2016-11-30 10:52           ` Ganapatrao Kulkarni
     [not found]             ` <CAFpQJXVqStQwRkm9F=e+8UFxWsddcwgB=AyfnZXSSaOw3eyBUA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-30 13:57               ` Robin Murphy
     [not found]           ` <3d0ddb50-6e63-3fe2-55c0-ce49579905c9-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-30 14:14             ` Alex Williamson [this message]
     [not found]     ` <6c9012fd-070b-6218-48e7-69b37f2559dd-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-30 10:37       ` Will Deacon
     [not found]         ` <20161130103713.GB2724-5wv7dgnIgG8@public.gmane.org>
2016-11-30 14:08           ` Auger Eric
     [not found]             ` <1899e46c-7b06-01d6-6cff-eb0985a4f11d-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-30 14:41               ` Robin Murphy
2016-12-07 18:52             ` Shanker Donthineni
     [not found]               ` <165d4f72-ef74-2db8-166a-1f90208315c8-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-12-08  7:34                 ` Auger Eric
2016-12-08  3:56   ` Bharat Bhushan
2016-12-08  9:36   ` Auger Eric
     [not found]     ` <c5d4efa7-699d-4aa3-44cc-4ce03d0ce185-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-08 13:14       ` Robin Murphy
     [not found]         ` <cd16fc5c-8649-0bfa-d67d-8f257aa38bd6-5wv7dgnIgG8@public.gmane.org>
2016-12-08 13:36           ` Auger Eric
     [not found]             ` <48e7d75a-8499-7f41-42d0-08fe081c192b-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-08 15:46               ` Robin Murphy
2016-12-08 17:01           ` Alex Williamson
2016-12-08 18:42             ` Robin Murphy
2016-12-11  2:05       ` Don Dutile
     [not found]         ` <584CB481.3040902-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-12-12  8:12           ` Auger Eric

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