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authorAdrian Hunter <adrian.hunter@intel.com>2023-09-11 14:21:13 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-10-04 10:32:22 -0700
commit7cd34dd3c9bf1d67ce7d1ab3fe8886c583ae0d9a (patch)
treea76caf2a4376cdc6598e2a4952c92f741e784ccb /include/linux/mm.h
parent46fa84a2b920f91780db3347de81d65efb668301 (diff)
efi/unaccepted: do not let /proc/vmcore try to access unaccepted memory
Patch series "Do not try to access unaccepted memory", v2. Support for unaccepted memory was added recently, refer commit dcdfdd40fa82 ("mm: Add support for unaccepted memory"), whereby a virtual machine may need to accept memory before it can be used. Plug a few gaps where RAM is exposed without checking if it is unaccepted memory. This patch (of 2): Support for unaccepted memory was added recently, refer commit dcdfdd40fa82 ("mm: Add support for unaccepted memory"), whereby a virtual machine may need to accept memory before it can be used. Do not let /proc/vmcore try to access unaccepted memory because it can cause the guest to fail. For /proc/vmcore, which is read-only, this means a read or mmap of unaccepted memory will return zeros. Link: https://lkml.kernel.org/r/20230911112114.91323-1-adrian.hunter@intel.com Link: https://lkml.kernel.org/r/20230911112114.91323-2-adrian.hunter@intel.com Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Baoquan He <bhe@redhat.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Young <dyoung@redhat.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 21c3d4e8a282..31dc25d3f6b5 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4054,4 +4054,11 @@ static inline void accept_memory(phys_addr_t start, phys_addr_t end)
#endif
+static inline bool pfn_is_unaccepted_memory(unsigned long pfn)
+{
+ phys_addr_t paddr = pfn << PAGE_SHIFT;
+
+ return range_contains_unaccepted_memory(paddr, paddr + PAGE_SIZE);
+}
+
#endif /* _LINUX_MM_H */