| Message ID | 1533042538-26184-1-git-send-email-vladimir.murzin@arm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Support Common Not Private translations | expand |
Hi Vladimir, On Tue, Jul 31, 2018 at 02:08:55PM +0100, Vladimir Murzin wrote: > Vladimir Murzin (3): > arm64: mm: Support Common Not Private translations > arm64: KVM: Enable Common Not Private translations > arm64: Introduce command line parameter to disable CNP I queued the first two patches for 4.20. I've also turned the feature on by default as is the case with other new architecture features. Thanks.
On 18/09/18 12:09, Catalin Marinas wrote: > Hi Vladimir, > > On Tue, Jul 31, 2018 at 02:08:55PM +0100, Vladimir Murzin wrote: >> Vladimir Murzin (3): >> arm64: mm: Support Common Not Private translations >> arm64: KVM: Enable Common Not Private translations >> arm64: Introduce command line parameter to disable CNP > > I queued the first two patches for 4.20. I've also turned the feature on > by default as is the case with other new architecture features. > Yay! Thanks Catalin! Vladimir > Thanks. >
Common Not Private (CNP) translations is a feature of ARMv8.2 extension which allows translation table entries to be shared between different PEs in the same inner shareable domain, so the hardware can use this fact to optimise the caching of such entries in the TLB. This patch set is an attempt to bring CNP support into Linux. It was tested on a v8.2 Fast Model with exploring traces and checking that TTBRx_ELy and VTTBR_EL2 have CnP bit set where appropriate. Changelog: v5 -> v6 - fix CONFIG_ARM64_PA_BITS_52 (per Catalin) - is_kdump_kernel() instead of elfcorehdr_size (per Suzuki) - rebased on 4.18-rc6 v4 -> v5 - cleanups and comment/commit improvements (per James) - VTTBR_CNP_BIT instead of a hard-coded value (per Catalin) - rebased on 4.18-rc1 v3 -> v4 - rebased on 4.17-rc4 for real v2 -> v3 - do not enable CNP if we are crush kernel (per James) - default to "no" - rebased on 4.17-rc4 v1 -> v2 - handle cpuilde case (per James) - use lm_allias with swapper_pg_dir (per James) - rule out ARM64_SW_TTBR0_PAN case (per Catalin) - s/BUG_ON/WARN_ON/ (per Catalin) - comment and commit message updates (per Catalin) - TTBR_CNP_BIT moved to asm/pgtable-hwdef.h (per Catalin) - has_useable_cnp() simplified (per Julien) RFC -> v1 - dropped RFC tag - rebased on 4.14-rc4 Thanks! Vladimir Murzin (3): arm64: mm: Support Common Not Private translations arm64: KVM: Enable Common Not Private translations arm64: Introduce command line parameter to disable CNP Documentation/admin-guide/kernel-parameters.txt | 4 +++ arch/arm/include/asm/kvm_arm.h | 1 + arch/arm/include/asm/kvm_mmu.h | 5 +++ arch/arm64/Kconfig | 13 ++++++++ arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/cpufeature.h | 6 ++++ arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/include/asm/kvm_mmu.h | 5 +++ arch/arm64/include/asm/mmu_context.h | 17 ++++++++-- arch/arm64/include/asm/pgtable-hwdef.h | 2 ++ arch/arm64/kernel/cpufeature.c | 43 +++++++++++++++++++++++++ arch/arm64/kernel/suspend.c | 4 +++ arch/arm64/kvm/hyp-init.S | 3 ++ arch/arm64/mm/context.c | 3 ++ arch/arm64/mm/proc.S | 11 +++++-- virt/kvm/arm/arm.c | 4 +-- 16 files changed, 117 insertions(+), 8 deletions(-)