09 Dec, 2020
1 commit
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Commit 9e2369c06c8a18 ("xen: add helpers to allocate unpopulated
memory") introduced usage of ZONE_DEVICE memory for foreign memory
mappings.Unfortunately this collides with using page->lru for Xen backend
private page caches.Fix that by using page->zone_device_data instead.
Cc: # 5.9
Fixes: 9e2369c06c8a18 ("xen: add helpers to allocate unpopulated memory")
Signed-off-by: Juergen Gross
Reviewed-by: Boris Ostrovsky
Reviewed-by: Jason Andryuk
Signed-off-by: Juergen Gross
14 Oct, 2020
2 commits
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In support of device-dax growing the ability to front physically
dis-contiguous ranges of memory, update devm_memremap_pages() to track
multiple ranges with a single reference counter and devm instance.Convert all [devm_]memremap_pages() users to specify the number of ranges
they are mapping in their 'struct dev_pagemap' instance.Signed-off-by: Dan Williams
Signed-off-by: Andrew Morton
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Benjamin Herrenschmidt
Cc: Vishal Verma
Cc: Vivek Goyal
Cc: Dave Jiang
Cc: Ben Skeggs
Cc: David Airlie
Cc: Daniel Vetter
Cc: Ira Weiny
Cc: Bjorn Helgaas
Cc: Boris Ostrovsky
Cc: Juergen Gross
Cc: Stefano Stabellini
Cc: "Jérôme Glisse"
Cc: Ard Biesheuvel
Cc: Ard Biesheuvel
Cc: Borislav Petkov
Cc: Brice Goglin
Cc: Catalin Marinas
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Greg Kroah-Hartman
Cc: "H. Peter Anvin"
Cc: Hulk Robot
Cc: Ingo Molnar
Cc: Jason Gunthorpe
Cc: Jason Yan
Cc: Jeff Moyer
Cc: "Jérôme Glisse"
Cc: Jia He
Cc: Joao Martins
Cc: Jonathan Cameron
Cc: kernel test robot
Cc: Mike Rapoport
Cc: Pavel Tatashin
Cc: Peter Zijlstra
Cc: "Rafael J. Wysocki"
Cc: Randy Dunlap
Cc: Thomas Gleixner
Cc: Tom Lendacky
Cc: Wei Yang
Cc: Will Deacon
Link: https://lkml.kernel.org/r/159643103789.4062302.18426128170217903785.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106116293.30709.13350662794915396198.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds -
The 'struct resource' in 'struct dev_pagemap' is only used for holding
resource span information. The other fields, 'name', 'flags', 'desc',
'parent', 'sibling', and 'child' are all unused wasted space.This is in preparation for introducing a multi-range extension of
devm_memremap_pages().The bulk of this change is unwinding all the places internal to libnvdimm
that used 'struct resource' unnecessarily, and replacing instances of
'struct dev_pagemap'.res with 'struct dev_pagemap'.range.P2PDMA had a minor usage of the resource flags field, but only to report
failures with "%pR". That is replaced with an open coded print of the
range.[dan.carpenter@oracle.com: mm/hmm/test: use after free in dmirror_allocate_chunk()]
Link: https://lkml.kernel.org/r/20200926121402.GA7467@kadamSigned-off-by: Dan Williams
Signed-off-by: Dan Carpenter
Signed-off-by: Andrew Morton
Reviewed-by: Boris Ostrovsky [xen]
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Benjamin Herrenschmidt
Cc: Vishal Verma
Cc: Vivek Goyal
Cc: Dave Jiang
Cc: Ben Skeggs
Cc: David Airlie
Cc: Daniel Vetter
Cc: Ira Weiny
Cc: Bjorn Helgaas
Cc: Juergen Gross
Cc: Stefano Stabellini
Cc: "Jérôme Glisse"
Cc: Andy Lutomirski
Cc: Ard Biesheuvel
Cc: Ard Biesheuvel
Cc: Borislav Petkov
Cc: Brice Goglin
Cc: Catalin Marinas
Cc: Dave Hansen
Cc: David Hildenbrand
Cc: Greg Kroah-Hartman
Cc: "H. Peter Anvin"
Cc: Hulk Robot
Cc: Ingo Molnar
Cc: Jason Gunthorpe
Cc: Jason Yan
Cc: Jeff Moyer
Cc: Jia He
Cc: Joao Martins
Cc: Jonathan Cameron
Cc: kernel test robot
Cc: Mike Rapoport
Cc: Pavel Tatashin
Cc: Peter Zijlstra
Cc: "Rafael J. Wysocki"
Cc: Randy Dunlap
Cc: Thomas Gleixner
Cc: Tom Lendacky
Cc: Wei Yang
Cc: Will Deacon
Link: https://lkml.kernel.org/r/159643103173.4062302.768998885691711532.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106115761.30709.13539840236873663620.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds
04 Sep, 2020
1 commit
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To be used in order to create foreign mappings. This is based on the
ZONE_DEVICE facility which is used by persistent memory devices in
order to create struct pages and kernel virtual mappings for the IOMEM
areas of such devices. Note that on kernels without support for
ZONE_DEVICE Xen will fallback to use ballooned pages in order to
create foreign mappings.The newly added helpers use the same parameters as the existing
{alloc/free}_xenballooned_pages functions, which allows for in-place
replacement of the callers. Once a memory region has been added to be
used as scratch mapping space it will no longer be released, and pages
returned are kept in a linked list. This allows to have a buffer of
pages and prevents resorting to frequent additions and removals of
regions.If enabled (because ZONE_DEVICE is supported) the usage of the new
functionality untangles Xen balloon and RAM hotplug from the usage of
unpopulated physical memory ranges to map foreign pages, which is the
correct thing to do in order to avoid mappings of foreign pages depend
on memory hotplug.Note the driver is currently not enabled on Arm platforms because it
would interfere with the identity mapping required on some platforms.Signed-off-by: Roger Pau Monné
Reviewed-by: Juergen Gross
Link: https://lore.kernel.org/r/20200901083326.21264-4-roger.pau@citrix.com
Signed-off-by: Juergen Gross
