Re: [Crash-utility] [PATCH v3 0/6] Second phase of future support for x86_64 5-level page tables

Changelog: V1-->V2: -Fix the backwards compatibility issues suggested by Dave -Test with "mod","kmem -f","vm -p" command again. V2-->V3: -keep the pml4, upml, last_upml_read and last_pml4_read members in struct machine_specific like before for extension modules suggested by Dave -move ptrs_per_pgd to the end of the machine_specific data structure -rewirte the changelog -rebase the patchset -retest it I found Dave had alread done the first phase of future support for x86_64 5-level page tables(commit 307e7f35f510). when I asked him about the state of this work, he gave me a more detailed answer and suggestion. I follow his advice, and do the following job. 1. Refine the original logical: 1) Create some new common function for getting the offset of page table 2) Repace the PML4 and UPML with the common PGD: machdep->machspec->pml4/upml ==> machdep->pdg 3) Using the PUD in x86_64 2. Add 5-level page tables support for x86_64_k/uvtop() This patchset is the second phase of the work, As Dave said, we need to be a manner of determining very early on whether the kernel page tables are using 5-level and whether each user-space task is using 4- or 5-level page tables. These will be done after this phase. About test work: I have tested this patchset with 4-level and 5-level paging table. sadump are not be tested. Dou Liyang (6): defs.h: Fix the PHYSICAL_PAGE_MASK macro x86_64: Extract public page table mapping code x86_64: Unify the page table parsing for 4-level mode x86_64.c: Add the VMEMMAP support for 5 level page table x86_64: Add 5-level paging support for x86_64_k/uvtop() x86_64: Fix the misusage of PGDIR_SHIFT defs.h | 56 ++--- sadump.c | 7 +- x86_64.c | 750 +++++++++++++++++++++++++++++++++------------------------------ 3 files changed, 418 insertions(+), 395 deletions(-) -- 2.14.3