Apologies for the delayed update. Its been quite some time since I posted the last version (v5), but I have been really caught up in some other critical issues. Changes since v5: ---------------- - v5 can be viewed here: http://lists.infradead.org/pipermail/kexec/2019-November/024055.html - Addressed review comments from James Morse and Boris. - Added Tested-by received from John on v5 patchset. - Rebased against arm64 (for-next/ptr-auth) branch which has Amit's patchset for ARMv8.3-A Pointer Authentication feature vmcoreinfo applied. Changes since v4: ---------------- - v4 can be seen here: http://lists.infradead.org/pipermail/kexec/2019-November/023961.html - Addressed comments from Dave and added patches for documenting new variables appended to vmcoreinfo documentation. - Added testing report shared by Akashi for PATCH 2/5. Changes since v3: ---------------- - v3 can be seen here: http://lists.infradead.org/pipermail/kexec/2019-March/022590.html - Addressed comments from James and exported TCR_EL1.T1SZ in vmcoreinfo instead of PTRS_PER_PGD. - Added a new patch (via [PATCH 3/3]), which fixes a simple typo in 'Documentation/arm64/memory.rst' Changes since v2: ---------------- - v2 can be seen here: http://lists.infradead.org/pipermail/kexec/2019-March/022531.html - Protected 'MAX_PHYSMEM_BITS' vmcoreinfo variable under CONFIG_SPARSEMEM ifdef sections, as suggested by Kazu. - Updated vmcoreinfo documentation to add description about 'MAX_PHYSMEM_BITS' variable (via [PATCH 3/3]). Changes since v1: ---------------- - v1 was sent out as a single patch which can be seen here: http://lists.infradead.org/pipermail/kexec/2019-February/022411.html - v2 breaks the single patch into two independent patches: [PATCH 1/2] appends 'PTRS_PER_PGD' to vmcoreinfo for arm64 arch, whereas [PATCH 2/2] appends 'MAX_PHYSMEM_BITS' to vmcoreinfo in core kernel code (all archs) This patchset primarily fixes the regression reported in user-space utilities like 'makedumpfile' and 'crash-utility' on arm64 architecture with the availability of 52-bit address space feature in underlying kernel. These regressions have been reported both on CPUs which don't support ARMv8.2 extensions (i.e. LVA, LPA) and are running newer kernels and also on prototype platforms (like ARMv8 FVP simulator model) which support ARMv8.2 extensions and are running newer kernels. The reason for these regressions is that right now user-space tools have no direct access to these values (since these are not exported from the kernel) and hence need to rely on a best-guess method of determining value of 'vabits_actual' and 'MAX_PHYSMEM_BITS' supported by underlying kernel. Exporting these values via vmcoreinfo will help user-land in such cases. In addition, as per suggestion from makedumpfile maintainer (Kazu), it makes more sense to append 'MAX_PHYSMEM_BITS' to vmcoreinfo in the core code itself rather than in arm64 arch-specific code, so that the user-space code for other archs can also benefit from this addition to the vmcoreinfo and use it as a standard way of determining 'SECTIONS_SHIFT' value in user-land. Cc: Boris Petkov <bp@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Cc: James Morse <james.morse@xxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Steve Capper <steve.capper@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Dave Anderson <anderson@xxxxxxxxxx> Cc: Kazuhito Hagio <k-hagio@xxxxxxxxxxxxx> Cc: John Donnelly <john.p.donnelly@xxxxxxxxxx> Cc: scott.branden@xxxxxxxxxxxx Cc: Amit Kachhap <amit.kachhap@xxxxxxx> Cc: x86@xxxxxxxxxx Cc: linuxppc-dev@xxxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: linux-doc@xxxxxxxxxxxxxxx Cc: kexec@xxxxxxxxxxxxxxxxxxx Bhupesh Sharma (2): crash_core, vmcoreinfo: Append 'MAX_PHYSMEM_BITS' to vmcoreinfo arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo Documentation/admin-guide/kdump/vmcoreinfo.rst | 16 ++++++++++++++++ arch/arm64/include/asm/pgtable-hwdef.h | 1 + arch/arm64/kernel/crash_core.c | 10 ++++++++++ kernel/crash_core.c | 1 + 4 files changed, 28 insertions(+) -- 2.7.4
