linux_dsm_epyc7002/arch/x86/mm
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>
2020-04-10 15:36:21 -07:00
..
pat x86/mm: introduce __set_memory_prot() 2020-04-10 15:36:21 -07:00
amdtopology.c
cpu_entry_area.c
debug_pagetables.c x86: mm: avoid allocating struct mm_struct on the stack 2020-02-04 03:05:25 +00:00
dump_pagetables.c x86/mm: Fix dump_pagetables with Xen PV 2020-02-29 12:43:10 +01:00
extable.c kill uaccess_try() 2020-03-26 15:02:14 -04:00
fault.c mm/vma: make vma_is_accessible() available for general use 2020-04-07 10:43:37 -07:00
highmem_32.c
hugetlbpage.c x86/mpx: remove MPX from arch/x86 2020-01-23 10:41:20 -08:00
ident_map.c
init_32.c mm/memory_hotplug: add pgprot_t to mhp_params 2020-04-10 15:36:21 -07:00
init_64.c mm/memory_hotplug: add pgprot_t to mhp_params 2020-04-10 15:36:21 -07:00
init.c x86/mm: thread pgprot_t through init_memory_mapping() 2020-04-10 15:36:21 -07:00
iomap_32.c x86/mm/pat: Rename <asm/pat.h> => <asm/memtype.h> 2019-12-10 10:12:55 +01:00
ioremap.c x86/ioremap: Fix CONFIG_EFI=n build 2020-03-19 10:55:56 +01:00
kasan_init_64.c x86/kasan: Print original address on #GP 2019-12-31 13:15:38 +01:00
kaslr.c
kmmio.c x86/mm/kmmio: Use this_cpu_ptr() instead get_cpu_var() for kmmio_ctx 2020-03-12 16:41:40 +01:00
maccess.c
Makefile x86: mm: convert dump_pagetables to use walk_page_range 2020-02-04 03:05:25 +00:00
mem_encrypt_boot.S
mem_encrypt_identity.c
mem_encrypt.c
mm_internal.h x86/mm: thread pgprot_t through init_memory_mapping() 2020-04-10 15:36:21 -07:00
mmap.c x86/mpx: remove MPX from arch/x86 2020-01-23 10:41:20 -08:00
mmio-mod.c x86/smp: Replace cpu_up/down() with add/remove_cpu() 2020-03-25 12:59:35 +01:00
numa_32.c
numa_64.c
numa_emulation.c x86/mm: Mark setup_emu2phys_nid() static 2020-03-27 11:07:30 +01:00
numa_internal.h
numa.c x86/NUMA: Provide a range-to-target_node lookup facility 2020-02-18 10:28:05 -08:00
pf_in.c
pf_in.h
pgtable_32.c mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions 2019-12-10 10:12:55 +01:00
pgtable.c
physaddr.c mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions 2019-12-10 10:12:55 +01:00
physaddr.h
pkeys.c mm/vma: introduce VM_ACCESS_FLAGS 2020-04-10 15:36:21 -07:00
pti.c x86/mm/set_memory: Fix -Wmissing-prototypes warnings 2020-03-27 11:26:06 +01:00
setup_nx.c
srat.c
testmmiotrace.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
tlb.c smp: Remove allocation mask from on_each_cpu_cond.*() 2020-01-24 20:40:09 +01:00