From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, benh@kernel.crashing.org,
bp@alien8.de, catalin.marinas@arm.com, dan.j.williams@intel.com,
dave.hansen@linux.intel.com, david@redhat.com,
ebadger@gigaio.com, hch@lst.de, hpa@zytor.com, jgg@ziepe.ca,
linux-mm@kvack.org, logang@deltatee.com, luto@kernel.org,
mhocko@suse.com, mingo@redhat.com, mm-commits@vger.kernel.org,
mpe@ellerman.id.au, paulus@samba.org, peterz@infradead.org,
tglx@linutronix.de, torvalds@linux-foundation.org,
will@kernel.org
Subject: [patch 24/35] mm/memory_hotplug: add pgprot_t to mhp_params
Date: Fri, 10 Apr 2020 14:33:36 -0700 [thread overview]
Message-ID: <20200410213336.7dA-akMbT%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200410143047.bf34a933ce1affdc042c7c80@linux-foundation.org>
From: Logan Gunthorpe <logang@deltatee.com>
Subject: 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.
Link: http://lkml.kernel.org/r/20200306170846.9333-7-logang@deltatee.com
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/arm64/mm/mmu.c | 3 ++-
arch/ia64/mm/init.c | 3 +++
arch/powerpc/mm/mem.c | 3 ++-
arch/s390/mm/init.c | 3 +++
arch/sh/mm/init.c | 3 +++
arch/x86/mm/init_32.c | 12 ++++++++++++
arch/x86/mm/init_64.c | 2 +-
include/linux/memory_hotplug.h | 3 +++
mm/memory_hotplug.c | 5 ++++-
mm/memremap.c | 6 +++---
10 files changed, 36 insertions(+), 7 deletions(-)
--- a/arch/arm64/mm/mmu.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/arch/arm64/mm/mmu.c
@@ -1382,7 +1382,8 @@ int arch_add_memory(int nid, u64 start,
flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
__create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start),
- size, PAGE_KERNEL, __pgd_pgtable_alloc, flags);
+ size, params->pgprot, __pgd_pgtable_alloc,
+ flags);
memblock_clear_nomap(start, size);
--- a/arch/ia64/mm/init.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/arch/ia64/mm/init.c
@@ -676,6 +676,9 @@ int arch_add_memory(int nid, u64 start,
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
+ if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
+ return -EINVAL;
+
ret = __add_pages(nid, start_pfn, nr_pages, params);
if (ret)
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
--- a/arch/powerpc/mm/mem.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/arch/powerpc/mm/mem.c
@@ -132,7 +132,8 @@ int __ref arch_add_memory(int nid, u64 s
resize_hpt_for_hotplug(memblock_phys_mem_size());
start = (unsigned long)__va(start);
- rc = create_section_mapping(start, start + size, nid, PAGE_KERNEL);
+ rc = create_section_mapping(start, start + size, nid,
+ params->pgprot);
if (rc) {
pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
start, start + size, rc);
--- a/arch/s390/mm/init.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/arch/s390/mm/init.c
@@ -277,6 +277,9 @@ int arch_add_memory(int nid, u64 start,
if (WARN_ON_ONCE(params->altmap))
return -EINVAL;
+ if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
+ return -EINVAL;
+
rc = vmem_add_mapping(start, size);
if (rc)
return rc;
--- a/arch/sh/mm/init.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/arch/sh/mm/init.c
@@ -412,6 +412,9 @@ int arch_add_memory(int nid, u64 start,
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
+ if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot)
+ return -EINVAL;
+
/* We only have ZONE_NORMAL, so this is easy.. */
ret = __add_pages(nid, start_pfn, nr_pages, params);
if (unlikely(ret))
--- a/arch/x86/mm/init_32.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/arch/x86/mm/init_32.c
@@ -824,6 +824,18 @@ int arch_add_memory(int nid, u64 start,
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
+ int ret;
+
+ /*
+ * The page tables were already mapped at boot so if the caller
+ * requests a different mapping type then we must change all the
+ * pages with __set_memory_prot().
+ */
+ if (params->pgprot.pgprot != PAGE_KERNEL.pgprot) {
+ ret = __set_memory_prot(start, nr_pages, params->pgprot);
+ if (ret)
+ return ret;
+ }
return __add_pages(nid, start_pfn, nr_pages, params);
}
--- a/arch/x86/mm/init_64.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/arch/x86/mm/init_64.c
@@ -867,7 +867,7 @@ int arch_add_memory(int nid, u64 start,
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
- init_memory_mapping(start, start + size, PAGE_KERNEL);
+ init_memory_mapping(start, start + size, params->pgprot);
return add_pages(nid, start_pfn, nr_pages, params);
}
--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/include/linux/memory_hotplug.h
@@ -60,9 +60,12 @@ enum {
/*
* Extended parameters for memory hotplug:
* altmap: alternative allocator for memmap array (optional)
+ * pgprot: page protection flags to apply to newly created page tables
+ * (required)
*/
struct mhp_params {
struct vmem_altmap *altmap;
+ pgprot_t pgprot;
};
/*
--- a/mm/memory_hotplug.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/mm/memory_hotplug.c
@@ -311,6 +311,9 @@ int __ref __add_pages(int nid, unsigned
int err;
struct vmem_altmap *altmap = params->altmap;
+ if (WARN_ON_ONCE(!params->pgprot.pgprot))
+ return -EINVAL;
+
err = check_hotplug_memory_addressable(pfn, nr_pages);
if (err)
return err;
@@ -1002,7 +1005,7 @@ static int online_memory_block(struct me
*/
int __ref add_memory_resource(int nid, struct resource *res)
{
- struct mhp_params params = {};
+ struct mhp_params params = { .pgprot = PAGE_KERNEL };
u64 start, size;
bool new_node = false;
int ret;
--- a/mm/memremap.c~mm-memory_hotplug-add-pgprot_t-to-mhp_params
+++ a/mm/memremap.c
@@ -189,8 +189,8 @@ void *memremap_pages(struct dev_pagemap
* We do not want any optional features only our own memmap
*/
.altmap = pgmap_altmap(pgmap),
+ .pgprot = PAGE_KERNEL,
};
- pgprot_t pgprot = PAGE_KERNEL;
int error, is_ram;
bool need_devmap_managed = true;
@@ -282,8 +282,8 @@ void *memremap_pages(struct dev_pagemap
if (nid < 0)
nid = numa_mem_id();
- error = track_pfn_remap(NULL, &pgprot, PHYS_PFN(res->start), 0,
- resource_size(res));
+ error = track_pfn_remap(NULL, ¶ms.pgprot, PHYS_PFN(res->start),
+ 0, resource_size(res));
if (error)
goto err_pfn_remap;
_
next prev parent reply other threads:[~2020-04-10 21:33 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-10 21:30 incoming Andrew Morton
2020-04-10 21:32 ` [patch 01/35] hfsplus: fix crash and filesystem corruption when deleting files Andrew Morton
2020-04-10 21:32 ` [patch 02/35] mm, memcg: do not high throttle allocators based on wraparound Andrew Morton
2020-04-10 21:32 ` [patch 03/35] mm, slab_common: fix a typo in comment "eariler"->"earlier" Andrew Morton
2020-04-10 21:32 ` [patch 04/35] docs: mm: slab.h: fix a broken cross-reference Andrew Morton
2020-04-10 21:32 ` [patch 05/35] mm/page_alloc.c: fix kernel-doc warning Andrew Morton
2020-04-10 21:32 ` [patch 06/35] mm/page_alloc: make pcpu_drain_mutex and pcpu_drain static Andrew Morton
2020-04-10 21:32 ` [patch 07/35] mm/gup: fix null pointer dereference detected by coverity Andrew Morton
2020-04-10 22:24 ` Linus Torvalds
2020-04-10 23:53 ` Peter Xu
2020-04-11 0:19 ` Linus Torvalds
2020-04-14 4:04 ` Miles Chen
2020-04-10 21:32 ` [patch 08/35] ocfs2: no need try to truncate file beyond i_size Andrew Morton
2020-04-10 21:32 ` [patch 09/35] mm: cma: NUMA node interface Andrew Morton
2020-04-10 21:32 ` [patch 10/35] mm: hugetlb: optionally allocate gigantic hugepages using cma Andrew Morton
2020-04-10 21:32 ` [patch 11/35] mm/mmap.c: initialize align_offset explicitly for vm_unmapped_area Andrew Morton
2020-04-10 21:32 ` [patch 12/35] mm/memory.c: refactor insert_page to prepare for batched-lock insert Andrew Morton
2020-04-10 21:32 ` [patch 13/35] mm: bring sparc pte_index() semantics inline with other platforms Andrew Morton
2020-04-10 21:32 ` [patch 14/35] mm: define pte_index as macro for x86 Andrew Morton
2020-04-10 21:33 ` [patch 15/35] mm/memory.c: add vm_insert_pages() Andrew Morton
2020-04-10 21:33 ` [patch 16/35] mm/vma: define a default value for VM_DATA_DEFAULT_FLAGS Andrew Morton
2020-04-10 21:33 ` [patch 17/35] mm/vma: introduce VM_ACCESS_FLAGS Andrew Morton
2020-04-10 21:33 ` [patch 18/35] mm/special: create generic fallbacks for pte_special() and pte_mkspecial() Andrew Morton
2020-04-10 21:33 ` [patch 19/35] mm/memory_hotplug: drop the flags field from struct mhp_restrictions Andrew Morton
2020-04-10 21:33 ` [patch 20/35] mm/memory_hotplug: rename mhp_restrictions to mhp_params Andrew Morton
2020-04-10 21:33 ` [patch 21/35] x86/mm: thread pgprot_t through init_memory_mapping() Andrew Morton
2020-04-10 21:33 ` [patch 22/35] x86/mm: introduce __set_memory_prot() Andrew Morton
2020-04-10 21:33 ` [patch 23/35] powerpc/mm: thread pgprot_t through create_section_mapping() Andrew Morton
2020-04-10 21:33 ` Andrew Morton [this message]
2020-04-10 21:33 ` [patch 25/35] mm/memremap: set caching mode for PCI P2PDMA memory to WC Andrew Morton
2020-04-10 21:33 ` [patch 26/35] kmod: make request_module() return an error when autoloading is disabled Andrew Morton
2020-04-10 21:33 ` [patch 27/35] fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once() Andrew Morton
2020-04-10 21:33 ` [patch 28/35] docs: admin-guide: document the kernel.modprobe sysctl Andrew Morton
2020-04-10 21:33 ` [patch 29/35] selftests: kmod: fix handling test numbers above 9 Andrew Morton
2020-04-10 21:33 ` [patch 30/35] selftests: kmod: test disabling module autoloading Andrew Morton
2020-04-10 21:34 ` [patch 31/35] change email address for Pali Rohár Andrew Morton
2020-04-10 21:44 ` Joe Perches
2020-04-10 21:34 ` [patch 32/35] drivers/dma/tegra20-apb-dma.c: fix platform_get_irq.cocci warnings Andrew Morton
2020-04-13 17:54 ` Jon Hunter
2020-04-10 21:34 ` [patch 33/35] fs/seq_file.c: seq_read(): add info message about buggy .next functions Andrew Morton
2020-04-10 21:34 ` [patch 34/35] kernel/gcov/fs.c: gcov_seq_next() should increase position index Andrew Morton
2020-04-10 21:34 ` [patch 35/35] ipc/util.c: sysvipc_find_ipc() " Andrew Morton
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