Logan Gunthorpe bfeb022f8f
mm/memory_hotplug: add pgprot_t to mhp_params ...
devm_memremap_pages() is currently used by the PCI P2PDMA code to create
struct page mappings for IO memory. At present, these mappings are
created with PAGE_KERNEL which implies setting the PAT bits to be WB.
However, on x86, an mtrr register will typically override this and force
the cache type to be UC-. In the case firmware doesn't set this
register it is effectively WB and will typically result in a machine
check exception when it's accessed.
Other arches are not currently likely to function correctly seeing they
don't have any MTRR registers to fall back on.
To solve this, provide a way to specify the pgprot value explicitly to
arch_add_memory().
Of the arches that support MEMORY_HOTPLUG: x86_64, and arm64 need a
simple change to pass the pgprot_t down to their respective functions
which set up the page tables. For x86_32, set the page tables
explicitly using _set_memory_prot() (seeing they are already mapped).
For ia64, s390 and sh, reject anything but PAGE_KERNEL settings -- this
should be fine, for now, seeing these architectures don't support
ZONE_DEVICE.
A check in __add_pages() is also added to ensure the pgprot parameter
was set for all arches.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com >
Signed-off-by: Andrew Morton <akpm@linux-foundation.org >
Acked-by: David Hildenbrand <david@redhat.com >
Acked-by: Michal Hocko <mhocko@suse.com >
Acked-by: Dan Williams <dan.j.williams@intel.com >
Cc: Andy Lutomirski <luto@kernel.org >
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Catalin Marinas <catalin.marinas@arm.com >
Cc: Christoph Hellwig <hch@lst.de >
Cc: Dave Hansen <dave.hansen@linux.intel.com >
Cc: Eric Badger <ebadger@gigaio.com >
Cc: "H. Peter Anvin" <hpa@zytor.com >
Cc: Ingo Molnar <mingo@redhat.com >
Cc: Jason Gunthorpe <jgg@ziepe.ca >
Cc: Michael Ellerman <mpe@ellerman.id.au >
Cc: Paul Mackerras <paulus@samba.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: Will Deacon <will@kernel.org >
Link: http://lkml.kernel.org/r/20200306170846.9333-7-logang@deltatee.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
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