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SubjectRe: [RFC PATCH v3 0/4] arm64: tlb: add support for TTL field
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Hi Zenghui,



On 2020/3/24 19:31, Zenghui Yu wrote:

>Hi Zhenyu,

>

>On 2020/3/21 20:16, Zhenyu Ye wrote:

>> --

>> ChangeList:

>> v3:

>> use vma->vm_flags to replace mm->context.flags.

>>

>> v2:

>> build the patch on Marc's NV series[1].

>>

>> v1:

>> add support for TTL field in arm64.

>>

>> --

>> ARMv8.4-TTL provides the TTL field in tlbi instruction to indicate

>> the level of translation table walk holding the leaf entry for the

>> address that is being invalidated. Hardware can use this information

>> to determine if there was a risk of splintering.

>>

>> Marc has provided basic support for ARM64-TTL features on his

>> NV series[1] patches. NV is a large feature, however, only

>> patches 62[2] and 67[3] are need by this patch set.

>> ** You only need read those two patches before review this patch. **

>

>It'd be good if you can put the whole thing into a series, otherwise

>people will have difficulty when reviewing and testing it...

>

>I haven't tracked the previous versions. If Marc is OK to share the

>two patches below [2][3], I'd suggest you to pick them up, add them

>in your series, rebase on top of mainline and resend it.

>

>

>Thanks,

>Zenghui

>



Thanks for your review. I'd take your suggestion and resend a new set

right now.



Thanks,

Zhenyu



>>

>> Some of this patch depends on a feature powered by @Will Deacon

>> two years ago, which tracking the level of page tables in mm_gather.

>> See more in commit a6d60245.

>>

>> [1] git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/nv-5.6-rc1

>> [2] https://lore.kernel.org/linux-arm-kernel/20200211174938.27809-63-maz@kernel.org/

>> [3] https://lore.kernel.org/linux-arm-kernel/20200211174938.27809-68-maz@kernel.org/

>>

>> Zhenyu Ye (4):

>> arm64: Add level-hinted TLB invalidation helper to tlbi_user

>> mm: Add page table level flags to vm_flags

>> arm64: tlb: Use translation level hint in vm_flags

>> mm: Set VM_LEVEL flags in some tlb_flush functions

>>

>> arch/arm64/include/asm/mmu.h | 2 ++

>> arch/arm64/include/asm/tlb.h | 12 +++++++++

>> arch/arm64/include/asm/tlbflush.h | 44 ++++++++++++++++++++++++++-----

>> arch/arm64/mm/hugetlbpage.c | 4 +--

>> arch/arm64/mm/mmu.c | 14 ++++++++++

>> include/asm-generic/pgtable.h | 16 +++++++++--

>> include/linux/mm.h | 10 +++++++

>> include/trace/events/mmflags.h | 15 ++++++++++-

>> mm/huge_memory.c | 8 +++++-

>> 9 files changed, 113 insertions(+), 12 deletions(-)

>>

>

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