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@intel.com>
---

[...]

+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 <redacted>

-- 
Cheers,

David / dhildenb