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Juergen Gross
50bd1f0825
The x86 struct arch_shared_info field pfn_to_mfn_frame_list_list currently contains the mfn of the top level page frame of the 3 level p2m tree, which is used by the Xen tools during saving and restoring (and live migration) of pv domains and for crash dump analysis. With three levels of the p2m tree it is possible to support up to 512 GB of RAM for a 64 bit pv domain. A 32 bit pv domain can support more, as each memory page can hold 1024 instead of 512 entries, leading to a limit of 4 TB. To be able to support more RAM on x86-64 switch to an additional virtual mapped p2m list. This patch expands struct arch_shared_info with a new p2m list virtual address, the root of the page table root and a p2m generation count. The new information is indicated by the domain to be valid by storing a non-zero value into the page table root member. To avoid build failures in the tools directory the checked structure sizes must be adapted, too. Signed-off-by: Juergen Gross <jgross@suse.com>