From: David Hildenbrand <david@redhat.com>
To: Jason Gunthorpe <jgg@nvidia.com>,
"Kasireddy, Vivek" <vivek.kasireddy@intel.com>
Cc: "dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
Mike Kravetz <mike.kravetz@oracle.com>,
Hugh Dickins <hughd@google.com>, Peter Xu <peterx@redhat.com>,
Gerd Hoffmann <kraxel@redhat.com>,
"Kim, Dongwon" <dongwon.kim@intel.com>,
"Chang, Junxiao" <junxiao.chang@intel.com>
Subject: Re: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA
Date: Thu, 14 Sep 2023 15:43:44 +0200 [thread overview]
Message-ID: <d7b8d777-d97e-6465-01e7-9702efafab43@redhat.com> (raw)
In-Reply-To: <ZO98rj4y0TA4+CfO@nvidia.com>
>> I think it makes sense to have a generic (non-GUP) version of
>> check_and_migrate_movable_pages() available in migration.h that
>> drivers can use to ensure that they don't break memory hotunplug
>> accidentally.
>
> Definately not.
>
> Either use the VMA and pin_user_pages(), or implement
> pin_user_pages_fd() in core code.
>
> Do not open code something wonky in drivers.
Agreed. pin_user_pages_fd() might become relevant in the context of
vfio/mdev + KVM gmem -- don't mmap guest memory but instead provide it
via a special memfd to the kernel.
So there might be value in having such a core infrastructure.
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2023-09-14 13:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-17 6:49 Vivek Kasireddy
2023-08-17 6:49 ` [PATCH v1 1/3] mm/gup: Export check_and_migrate_movable_pages() Vivek Kasireddy
2023-08-30 14:15 ` Christoph Hellwig
2023-08-17 6:49 ` [PATCH v1 2/3] udmabuf: Add support for page migration out of movable zone or CMA Vivek Kasireddy
2023-08-17 6:49 ` [PATCH v1 3/3] selftests/dma-buf/udmabuf: Add tests to verify data after page migration Vivek Kasireddy
2023-08-17 15:01 ` [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA Jason Gunthorpe
2023-08-22 5:36 ` Kasireddy, Vivek
2023-08-22 12:23 ` Jason Gunthorpe
2023-08-23 9:34 ` David Hildenbrand
2023-08-24 6:31 ` Kasireddy, Vivek
2023-08-24 18:30 ` David Hildenbrand
2023-08-24 18:30 ` Jason Gunthorpe
2023-08-24 18:33 ` David Hildenbrand
2023-08-25 17:29 ` Jason Gunthorpe
2023-08-27 18:49 ` Kasireddy, Vivek
2023-08-27 19:05 ` Kasireddy, Vivek
2023-08-30 17:30 ` Jason Gunthorpe
2023-09-14 13:43 ` David Hildenbrand [this message]
2023-09-16 18:31 ` Kasireddy, Vivek
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