From: Jason Gunthorpe <jgg@nvidia.com>
To: Marc Zyngier <maz@kernel.org>
Cc: ankita@nvidia.com, alex.williamson@redhat.com,
naoya.horiguchi@nec.com, oliver.upton@linux.dev,
aniketa@nvidia.com, cjia@nvidia.com, kwankhede@nvidia.com,
targupta@nvidia.com, vsethi@nvidia.com, acurrid@nvidia.com,
apopple@nvidia.com, jhubbard@nvidia.com, danw@nvidia.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org
Subject: Re: [PATCH v3 1/6] kvm: determine memory type from VMA
Date: Wed, 12 Apr 2023 10:01:33 -0300 [thread overview]
Message-ID: <ZDarrZmLWlA+BHQG@nvidia.com> (raw)
In-Reply-To: <86r0spl18x.wl-maz@kernel.org>
On Wed, Apr 12, 2023 at 01:43:26PM +0100, Marc Zyngier wrote:
> What makes it safe? How does VFIO ensures that the memory type used is
> correct in all circumstances? This has to hold for *ANY* device, not
> just your favourite toy of the day. Nothing in this patch is horribly
> wrong, but the above question must be answered before we can consider
> any of this.
In VFIO we now have the concept of "variant drivers" which work with
specific PCI IDs. The variant drivers can inject device specific
knowledge into VFIO. In this series the driver injects the cachable
pgprot when it creates some of the VMAs because it knows the PCI IDs
it supports, parses the ACPI description, and knows for sure that the
memory it puts in the cachable VMA is linked with a cache coherent
interconnect.
The generic vfio-pci path is not changed, so 'any device' is not
relevant here.
Jason
next prev parent reply other threads:[~2023-04-12 13:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-05 18:01 [PATCH v3 0/6] Expose GPU memory as coherently CPU accessible ankita
2023-04-05 18:01 ` [PATCH v3 1/6] kvm: determine memory type from VMA ankita
2023-04-12 12:43 ` Marc Zyngier
2023-04-12 13:01 ` Jason Gunthorpe [this message]
2023-05-31 11:35 ` Catalin Marinas
2023-06-14 12:44 ` Jason Gunthorpe
2023-07-14 8:10 ` Benjamin Herrenschmidt
2023-07-16 15:09 ` Catalin Marinas
2023-07-16 22:30 ` Jason Gunthorpe
2023-07-17 18:35 ` Alex Williamson
2023-07-25 6:18 ` Benjamin Herrenschmidt
2023-04-05 18:01 ` [PATCH v3 2/6] vfio/nvgpu: expose GPU device memory as BAR1 ankita
2023-04-05 21:07 ` kernel test robot
2023-04-05 18:01 ` [PATCH v3 3/6] mm: handle poisoning of pfn without struct pages ankita
2023-04-05 21:07 ` kernel test robot
2023-05-09 9:51 ` HORIGUCHI NAOYA(堀口 直也)
2023-05-15 11:18 ` Ankit Agrawal
2023-05-23 5:43 ` HORIGUCHI NAOYA(堀口 直也)
2023-04-05 18:01 ` [PATCH v3 4/6] mm: Add poison error check in fixup_user_fault() for mapped PFN ankita
2023-04-05 18:01 ` [PATCH v3 5/6] mm: Change ghes code to allow poison of non-struct PFN ankita
2023-04-05 18:01 ` [PATCH v3 6/6] vfio/nvgpu: register device memory for poison handling ankita
2023-04-05 20:24 ` Zhi Wang
2023-04-05 21:50 ` kernel test robot
2023-05-24 9:53 ` Dan Carpenter
2023-04-06 12:07 ` [PATCH v3 0/6] Expose GPU memory as coherently CPU accessible David Hildenbrand
2023-04-12 8:43 ` Ankit Agrawal
2023-04-12 9:48 ` Marc Zyngier
2023-04-12 12:28 ` Marc Zyngier
2023-04-12 12:53 ` Jason Gunthorpe
2023-04-13 9:52 ` Marc Zyngier
2023-04-13 13:19 ` Jason Gunthorpe
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