On 11.09.23 13:21, Adrian Hunter wrote:
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.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
[...]
+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 */
As stated, if the relevant table is not already properly populated with
information about unaccepted memory by the first kernel, this probably
logically belongs into Kirills series.
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
--
Cheers,
David / dhildenb
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