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authorAnshuman Khandual <anshuman.khandual@arm.com>2021-02-26 04:17:33 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 20:41:00 +0300
commitbca3feaa0764ab5a4cbe6817871601f1d00c059d (patch)
treee715bd0100363fb7ff851548c23c7e3ef5debb8a /mm/memory_hotplug.c
parenta89107c0478137115c6647aa28caef75513b9f40 (diff)
downloadlinux-bca3feaa0764ab5a4cbe6817871601f1d00c059d.tar.xz
mm/memory_hotplug: prevalidate the address range being added with platform
Patch series "mm/memory_hotplug: Pre-validate the address range with platform", v5. This series adds a mechanism allowing platforms to weigh in and prevalidate incoming address range before proceeding further with the memory hotplug. This helps prevent potential platform errors for the given address range, down the hotplug call chain, which inevitably fails the hotplug itself. This mechanism was suggested by David Hildenbrand during another discussion with respect to a memory hotplug fix on arm64 platform. https://lore.kernel.org/linux-arm-kernel/1600332402-30123-1-git-send-email-anshuman.khandual@arm.com/ This mechanism focuses on the addressibility aspect and not [sub] section alignment aspect. Hence check_hotplug_memory_range() and check_pfn_span() have been left unchanged. This patch (of 4): This introduces mhp_range_allowed() which can be called in various memory hotplug paths to prevalidate the address range which is being added, with the platform. Then mhp_range_allowed() calls mhp_get_pluggable_range() which provides applicable address range depending on whether linear mapping is required or not. For ranges that require linear mapping, it calls a new arch callback arch_get_mappable_range() which the platform can override. So the new callback, in turn provides the platform an opportunity to configure acceptable memory hotplug address ranges in case there are constraints. This mechanism will help prevent platform specific errors deep down during hotplug calls. This drops now redundant check_hotplug_memory_addressable() check in __add_pages() but instead adds a VM_BUG_ON() check which would ensure that the range has been validated with mhp_range_allowed() earlier in the call chain. Besides mhp_get_pluggable_range() also can be used by potential memory hotplug callers to avail the allowed physical range which would go through on a given platform. This does not really add any new range check in generic memory hotplug but instead compensates for lost checks in arch_add_memory() where applicable and check_hotplug_memory_addressable(), with unified mhp_range_allowed(). [akpm@linux-foundation.org: make pagemap_range() return -EINVAL when mhp_range_allowed() fails] Link: https://lkml.kernel.org/r/1612149902-7867-1-git-send-email-anshuman.khandual@arm.com Link: https://lkml.kernel.org/r/1612149902-7867-2-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Suggested-by: David Hildenbrand <david@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> # s390 Cc: Will Deacon <will@kernel.org> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Pankaj Gupta <pankaj.gupta@cloud.ionos.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: teawater <teawaterz@linux.alibaba.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c78
1 files changed, 59 insertions, 19 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a969463bdda4..5ba51a8bdaeb 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -107,6 +107,9 @@ static struct resource *register_memory_resource(u64 start, u64 size,
if (strcmp(resource_name, "System RAM"))
flags |= IORESOURCE_SYSRAM_DRIVER_MANAGED;
+ if (!mhp_range_allowed(start, size, true))
+ return ERR_PTR(-E2BIG);
+
/*
* Make sure value parsed from 'mem=' only restricts memory adding
* while booting, so that memory hotplug won't be impacted. Please
@@ -284,22 +287,6 @@ static int check_pfn_span(unsigned long pfn, unsigned long nr_pages,
return 0;
}
-static int check_hotplug_memory_addressable(unsigned long pfn,
- unsigned long nr_pages)
-{
- const u64 max_addr = PFN_PHYS(pfn + nr_pages) - 1;
-
- if (max_addr >> MAX_PHYSMEM_BITS) {
- const u64 max_allowed = (1ull << (MAX_PHYSMEM_BITS + 1)) - 1;
- WARN(1,
- "Hotplugged memory exceeds maximum addressable address, range=%#llx-%#llx, maximum=%#llx\n",
- (u64)PFN_PHYS(pfn), max_addr, max_allowed);
- return -E2BIG;
- }
-
- return 0;
-}
-
/*
* Return page for the valid pfn only if the page is online. All pfn
* walkers which rely on the fully initialized page->flags and others
@@ -365,9 +352,7 @@ int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages,
if (WARN_ON_ONCE(!params->pgprot.pgprot))
return -EINVAL;
- err = check_hotplug_memory_addressable(pfn, nr_pages);
- if (err)
- return err;
+ VM_BUG_ON(!mhp_range_allowed(PFN_PHYS(pfn), nr_pages * PAGE_SIZE, false));
if (altmap) {
/*
@@ -1248,6 +1233,61 @@ out_unlock:
}
EXPORT_SYMBOL_GPL(add_memory_driver_managed);
+/*
+ * Platforms should define arch_get_mappable_range() that provides
+ * maximum possible addressable physical memory range for which the
+ * linear mapping could be created. The platform returned address
+ * range must adhere to these following semantics.
+ *
+ * - range.start <= range.end
+ * - Range includes both end points [range.start..range.end]
+ *
+ * There is also a fallback definition provided here, allowing the
+ * entire possible physical address range in case any platform does
+ * not define arch_get_mappable_range().
+ */
+struct range __weak arch_get_mappable_range(void)
+{
+ struct range mhp_range = {
+ .start = 0UL,
+ .end = -1ULL,
+ };
+ return mhp_range;
+}
+
+struct range mhp_get_pluggable_range(bool need_mapping)
+{
+ const u64 max_phys = (1ULL << MAX_PHYSMEM_BITS) - 1;
+ struct range mhp_range;
+
+ if (need_mapping) {
+ mhp_range = arch_get_mappable_range();
+ if (mhp_range.start > max_phys) {
+ mhp_range.start = 0;
+ mhp_range.end = 0;
+ }
+ mhp_range.end = min_t(u64, mhp_range.end, max_phys);
+ } else {
+ mhp_range.start = 0;
+ mhp_range.end = max_phys;
+ }
+ return mhp_range;
+}
+EXPORT_SYMBOL_GPL(mhp_get_pluggable_range);
+
+bool mhp_range_allowed(u64 start, u64 size, bool need_mapping)
+{
+ struct range mhp_range = mhp_get_pluggable_range(need_mapping);
+ u64 end = start + size;
+
+ if (start < end && start >= mhp_range.start && (end - 1) <= mhp_range.end)
+ return true;
+
+ pr_warn("Hotplug memory [%#llx-%#llx] exceeds maximum addressable range [%#llx-%#llx]\n",
+ start, end, mhp_range.start, mhp_range.end);
+ return false;
+}
+
#ifdef CONFIG_MEMORY_HOTREMOVE
/*
* Confirm all pages in a range [start, end) belong to the same zone (skipping