This series enables 52 bits PA support for 4K and 16K page configs via existing CONFIG_ARM64_PA_BITS_52, utilizing a new arch feature FEAT_LPA2 which is available from ARM v8.7. IDMAP needs changes to accommodate two new level of page tables in certain scenarios like (4K|39VA|52PA) but the same problem also exists for (16K|36VA|48PA) which needs fixing. I have sent a fix for 16K case [1] and later will enable it for FEAT_LPA2 as well. This series applies on v5.14-rc3. Testing: Build and boot tested (individual patches) on all existing and new FEAT_LPA2 enabled config combinations. Pending: - Enable IDMAP for FEAT_LPA2 - Enable 52 bit VA range on 4K/16K page sizes - Evaluate KVM and SMMU impacts from FEAT_LPA2 [1] https://lore.kernel.org/lkml/1627019894-14819-1-git-send-email-anshuman.khandual@xxxxxxx/ Changes in RFC V2: - Changed FEAT_LPA2 presence qualifying criteria wrt ID_AA64MMFR0_TGRAN_LPA2 - Changed FEAT_LPA2 specific encoding which drops the additional tmp variable - Fixed [phys|pte]_to_[pte|phys]() helpers when FEAT_LPA2 is implemented Changes in RFC V1: https://lore.kernel.org/lkml/1626229291-6569-1-git-send-email-anshuman.khandual@xxxxxxx/ Anshuman Khandual (10): mm/mmap: Dynamically initialize protection_map[] arm64/mm: Consolidate TCR_EL1 fields arm64/mm: Add FEAT_LPA2 specific TCR_EL1.DS field arm64/mm: Add FEAT_LPA2 specific ID_AA64MMFR0.TGRAN[2] arm64/mm: Add CONFIG_ARM64_PA_BITS_52_[LPA|LPA2] arm64/mm: Add FEAT_LPA2 specific encoding arm64/mm: Detect and enable FEAT_LPA2 arm64/mm: Add FEAT_LPA2 specific PTE_SHARED and PMD_SECT_S arm64/mm: Add FEAT_LPA2 specific fallback (48 bits PA) when not implemented arm64/mm: Enable CONFIG_ARM64_PA_BITS_52 on CONFIG_ARM64_[4K|16K]_PAGES arch/arm64/Kconfig | 9 ++++++- arch/arm64/include/asm/assembler.h | 42 ++++++++++++++++++++++++++------- arch/arm64/include/asm/kernel-pgtable.h | 4 ++-- arch/arm64/include/asm/memory.h | 1 + arch/arm64/include/asm/pgtable-hwdef.h | 28 ++++++++++++++++++---- arch/arm64/include/asm/pgtable.h | 18 +++++++++++--- arch/arm64/include/asm/sysreg.h | 9 +++---- arch/arm64/kernel/head.S | 30 +++++++++++++++++++++++ arch/arm64/mm/mmu.c | 3 +++ arch/arm64/mm/pgd.c | 2 +- arch/arm64/mm/proc.S | 11 ++++++++- arch/arm64/mm/ptdump.c | 26 ++++++++++++++++++-- mm/mmap.c | 26 ++++++++++++++++---- 13 files changed, 177 insertions(+), 32 deletions(-) -- 2.7.4
