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On Intel TDX guest, unaccepted memory is unusable free memory which is not managed by buddy, until it's accepted by guest. Before that, it cannot be accessed by the first kernel as well as the kexec'ed kernel. The kexec'ed kernel will skip these pages and fill in zero data for the reader of vmcore. The dump tool like makedumpfile creates a page descriptor (size 24 bytes) for each non-free page, including zero data page, but it will not create descriptor for free pages. If it is not able to distinguish these unaccepted pages with zero data pages, a certain amount of space will be wasted in proportion (~1/170). In fact, as a special kind of free page the unaccepted pages should be excluded, like the real free pages. Export the page type PAGE_UNACCEPTED_MAPCOUNT_VALUE to vmcoreinfo, so that dump tool can identify whether a page is unaccepted. [zhiquan1.li@intel.com: fix docs: "Title underline too short" warning] Link: https://lore.kernel.org/all/20240809114854.3745464-5-kirill.shutemov@linux.intel.com/ Link: https://lkml.kernel.org/r/20250405060610.860465-1-zhiquan1.li@intel.com Link: https://lore.kernel.org/all/20240809114854.3745464-5-kirill.shutemov@linux.intel.com/ Link: https://lkml.kernel.org/r/20250403030801.758687-1-zhiquan1.li@intel.com Signed-off-by: Zhiquan Li <zhiquan1.li@intel.com> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Baoquan He <bhe@redhat.com> Cc: Dave Young <dyoung@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Zhiquan Li <zhiquan1.li@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| subsystem-apis.rst | ||