From: Christoph Hellwig <hch@lst.de>
To: "Jason Gunthorpe" <jgg@ziepe.ca>,
"Dan Williams" <dan.j.williams@intel.com>,
"Bharata B Rao" <bharata@linux.ibm.com>,
"Christian König" <christian.koenig@amd.com>,
"Ben Skeggs" <bskeggs@redhat.com>
Cc: Jerome Glisse <jglisse@redhat.com>,
kvm-ppc@vger.kernel.org, amd-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org,
linux-mm@kvack.org
Subject: ensure device private pages have an owner
Date: Mon, 16 Mar 2020 18:52:57 +0100 [thread overview]
Message-ID: <20200316175259.908713-1-hch@lst.de> (raw)
When acting on device private mappings a driver needs to know if the
device (or other entity in case of kvmppc) actually owns this private
mapping. This series adds an owner field and converts the migrate_vma
code over to check it. I looked into doing the same for
hmm_range_fault, but as far as I can tell that code has never been
wired up to actually work for device private memory, so instead of
trying to fix some unused code the second patch just remove the code.
We can add it back once we have a working and fully tested code, and
then should pass the expected owner in the hmm_range structure.
next reply other threads:[~2020-03-16 17:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-16 17:52 Christoph Hellwig [this message]
2020-03-16 17:52 ` [PATCH 1/2] mm: handle multiple owners of device private pages in migrate_vma Christoph Hellwig
2020-03-16 18:17 ` Jason Gunthorpe
2020-03-16 18:20 ` Christoph Hellwig
2020-03-16 17:52 ` [PATCH 2/2] mm: remove device private page support from hmm_range_fault Christoph Hellwig
2020-03-16 18:42 ` Ralph Campbell
2020-03-16 18:49 ` Christoph Hellwig
2020-03-16 18:58 ` Christoph Hellwig
2020-03-16 19:56 ` Ralph Campbell
2020-03-16 20:09 ` Jason Gunthorpe
2020-03-16 20:24 ` Ralph Campbell
2020-03-17 11:56 ` Jason Gunthorpe
2020-03-17 22:46 ` Ralph Campbell
2020-03-16 19:04 ` Jason Gunthorpe
2020-03-16 19:07 ` Christoph Hellwig
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