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6acd7d5ef2
The pmem driver on PowerPC crashes with the following signature when
instantiating misaligned namespaces that map their capacity via
memremap_pages().
BUG: Unable to handle kernel data access at 0xc001000406000000
Faulting instruction address: 0xc000000000090790
NIP [c000000000090790] arch_add_memory+0xc0/0x130
LR [c000000000090744] arch_add_memory+0x74/0x130
Call Trace:
arch_add_memory+0x74/0x130 (unreliable)
memremap_pages+0x74c/0xa30
devm_memremap_pages+0x3c/0xa0
pmem_attach_disk+0x188/0x770
nvdimm_bus_probe+0xd8/0x470
With the assumption that only memremap_pages() has alignment
constraints, enforce memremap_compat_align() for
pmem_should_map_pages(), nd_pfn, and nd_dax cases. This includes
preventing the creation of namespaces where the base address is
misaligned and cases there infoblock padding parameters are invalid.
Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Fixes: a3619190d6 ("libnvdimm/pfn: stop padding pmem namespaces to section alignment")
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2014-2015, Intel Corporation.
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*/
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#ifndef __NVDIMM_PFN_H
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#define __NVDIMM_PFN_H
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#include <linux/types.h>
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#include <linux/mmzone.h>
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#define PFN_SIG_LEN 16
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#define PFN_SIG "NVDIMM_PFN_INFO\0"
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#define DAX_SIG "NVDIMM_DAX_INFO\0"
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struct nd_pfn_sb {
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u8 signature[PFN_SIG_LEN];
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u8 uuid[16];
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u8 parent_uuid[16];
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__le32 flags;
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__le16 version_major;
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__le16 version_minor;
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__le64 dataoff; /* relative to namespace_base + start_pad */
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__le64 npfns;
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__le32 mode;
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/* minor-version-1 additions for section alignment */
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/**
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* @start_pad: Deprecated attribute to pad start-misaligned namespaces
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*
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* start_pad is deprecated because the original definition did
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* not comprehend that dataoff is relative to the base address
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* of the namespace not the start_pad adjusted base. The result
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* is that the dax path is broken, but the block-I/O path is
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* not. The kernel will no longer create namespaces using start
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* padding, but it still supports block-I/O for legacy
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* configurations mainly to allow a backup, reconfigure the
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* namespace, and restore flow to repair dax operation.
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*/
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__le32 start_pad;
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__le32 end_trunc;
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/* minor-version-2 record the base alignment of the mapping */
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__le32 align;
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/* minor-version-3 guarantee the padding and flags are zero */
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/* minor-version-4 record the page size and struct page size */
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__le32 page_size;
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__le16 page_struct_size;
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u8 padding[3994];
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__le64 checksum;
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};
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#endif /* __NVDIMM_PFN_H */
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