[PATCH v3 00/21] KVM: arm64: Rewrite page-table code and fault handling

[Alexandru Elisei]

Hi Will,

I've been looking into pinning guest memory for KVM SPE, so I like to think that
the stage 2 page table code is not entirely alien to me. I'll do my best to review
the series, I hope you'll find it useful.

Thanks,

Alex

On 8/25/20 10:39 AM, Will Deacon wrote:
> Hello folks,
>
> This is version three of the KVM page-table rework that I previously posted
> here:
>
>   v1: https://lore.kernel.org/r/20200730153406.25136-1-will@kernel.org
>   v2: https://lore.kernel.org/r/20200818132818.16065-1-will@kernel.org
>
> Changes since v2 include:
>
>   * Rebased onto -rc2, which includes the conflicting OOM blocking fixes
>   * Dropped the patch trying to "fix" the memcache in kvm_phys_addr_ioremap()
>
> Cheers,
>
> Will
>
> Cc: Marc Zyngier <maz at kernel.org>
> Cc: Quentin Perret <qperret at google.com>
> Cc: James Morse <james.morse at arm.com>
> Cc: Suzuki Poulose <suzuki.poulose at arm.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Gavin Shan <gshan at redhat.com>
> Cc: kernel-team at android.com
> Cc: linux-arm-kernel at lists.infradead.org
>
> --->8
>
> Quentin Perret (4):
>   KVM: arm64: Add support for stage-2 write-protect in generic
>     page-table
>   KVM: arm64: Convert write-protect operation to generic page-table API
>   KVM: arm64: Add support for stage-2 cache flushing in generic
>     page-table
>   KVM: arm64: Convert memslot cache-flushing code to generic page-table
>     API
>
> Will Deacon (17):
>   KVM: arm64: Remove kvm_mmu_free_memory_caches()
>   KVM: arm64: Add stand-alone page-table walker infrastructure
>   KVM: arm64: Add support for creating kernel-agnostic stage-1 page
>     tables
>   KVM: arm64: Use generic allocator for hyp stage-1 page-tables
>   KVM: arm64: Add support for creating kernel-agnostic stage-2 page
>     tables
>   KVM: arm64: Add support for stage-2 map()/unmap() in generic
>     page-table
>   KVM: arm64: Convert kvm_phys_addr_ioremap() to generic page-table API
>   KVM: arm64: Convert kvm_set_spte_hva() to generic page-table API
>   KVM: arm64: Convert unmap_stage2_range() to generic page-table API
>   KVM: arm64: Add support for stage-2 page-aging in generic page-table
>   KVM: arm64: Convert page-aging and access faults to generic page-table
>     API
>   KVM: arm64: Add support for relaxing stage-2 perms in generic
>     page-table code
>   KVM: arm64: Convert user_mem_abort() to generic page-table API
>   KVM: arm64: Check the pgt instead of the pgd when modifying page-table
>   KVM: arm64: Remove unused page-table code
>   KVM: arm64: Remove unused 'pgd' field from 'struct kvm_s2_mmu'
>   KVM: arm64: Don't constrain maximum IPA size based on host
>     configuration
>
>  arch/arm64/include/asm/kvm_host.h       |    2 +-
>  arch/arm64/include/asm/kvm_mmu.h        |  221 +---
>  arch/arm64/include/asm/kvm_pgtable.h    |  279 ++++
>  arch/arm64/include/asm/pgtable-hwdef.h  |   23 -
>  arch/arm64/include/asm/pgtable-prot.h   |   19 -
>  arch/arm64/include/asm/stage2_pgtable.h |  215 ----
>  arch/arm64/kvm/arm.c                    |    2 +-
>  arch/arm64/kvm/hyp/Makefile             |    2 +-
>  arch/arm64/kvm/hyp/pgtable.c            |  860 +++++++++++++
>  arch/arm64/kvm/mmu.c                    | 1566 +++--------------------
>  arch/arm64/kvm/reset.c                  |   38 +-
>  11 files changed, 1326 insertions(+), 1901 deletions(-)
>  create mode 100644 arch/arm64/include/asm/kvm_pgtable.h
>  create mode 100644 arch/arm64/kvm/hyp/pgtable.c
>