On 03/07/20 04:35, Sean Christopherson wrote:
> The only interesting delta from v2 is that patch 18 is updated to handle
> a conflict with arm64's p4d rework. Resolution was straightforward
> (famous last words).
>
>
> This series resurrects Christoffer Dall's series[1] to provide a common
> MMU memory cache implementation that can be shared by x86, arm64 and MIPS.
>
> It also picks up a suggested change from Ben Gardon[2] to clear shadow
> page tables during initial allocation so as to avoid clearing entire
> pages while holding mmu_lock.
>
> The front half of the patches do house cleaning on x86's memory cache
> implementation in preparation for moving it to common code, along with a
> fair bit of cleanup on the usage. The middle chunk moves the patches to
> common KVM, and the last two chunks convert arm64 and MIPS to the common
> implementation.
>
> Fully tested on x86 only. Compile tested patches 14-21 on arm64, MIPS,
> s390 and PowerPC.
Queued, thanks.
Paolo
> v3:
> - Rebased to kvm/queue, commit a037ff353ba6 ("Merge ... into HEAD")
> - Collect more review tags. [Ben]
>
> v2:
> - Rebase to kvm-5.8-2, commit 49b3deaad345 ("Merge tag ...").
> - Use an asm-generic kvm_types.h for s390 and PowerPC instead of an
> empty arch-specific file. [Marc]
> - Explicit document "GFP_PGTABLE_USER == GFP_KERNEL_ACCOUNT | GFP_ZERO"
> in the arm64 conversion patch. [Marc]
> - Collect review tags. [Ben]
>
> Sean Christopherson (21):
> KVM: x86/mmu: Track the associated kmem_cache in the MMU caches
> KVM: x86/mmu: Consolidate "page" variant of memory cache helpers
> KVM: x86/mmu: Use consistent "mc" name for kvm_mmu_memory_cache locals
> KVM: x86/mmu: Remove superfluous gotos from mmu_topup_memory_caches()
> KVM: x86/mmu: Try to avoid crashing KVM if a MMU memory cache is empty
> KVM: x86/mmu: Move fast_page_fault() call above
> mmu_topup_memory_caches()
> KVM: x86/mmu: Topup memory caches after walking GVA->GPA
> KVM: x86/mmu: Clean up the gorilla math in mmu_topup_memory_caches()
> KVM: x86/mmu: Separate the memory caches for shadow pages and gfn
> arrays
> KVM: x86/mmu: Make __GFP_ZERO a property of the memory cache
> KVM: x86/mmu: Zero allocate shadow pages (outside of mmu_lock)
> KVM: x86/mmu: Skip filling the gfn cache for guaranteed direct MMU
> topups
> KVM: x86/mmu: Prepend "kvm_" to memory cache helpers that will be
> global
> KVM: Move x86's version of struct kvm_mmu_memory_cache to common code
> KVM: Move x86's MMU memory cache helpers to common KVM code
> KVM: arm64: Drop @max param from mmu_topup_memory_cache()
> KVM: arm64: Use common code's approach for __GFP_ZERO with memory
> caches
> KVM: arm64: Use common KVM implementation of MMU memory caches
> KVM: MIPS: Drop @max param from mmu_topup_memory_cache()
> KVM: MIPS: Account pages used for GPA page tables
> KVM: MIPS: Use common KVM implementation of MMU memory caches
>
> arch/arm64/include/asm/kvm_host.h | 11 ---
> arch/arm64/include/asm/kvm_types.h | 8 ++
> arch/arm64/kvm/arm.c | 2 +
> arch/arm64/kvm/mmu.c | 56 +++----------
> arch/mips/include/asm/kvm_host.h | 11 ---
> arch/mips/include/asm/kvm_types.h | 7 ++
> arch/mips/kvm/mmu.c | 44 ++--------
> arch/powerpc/include/asm/Kbuild | 1 +
> arch/s390/include/asm/Kbuild | 1 +
> arch/x86/include/asm/kvm_host.h | 14 +---
> arch/x86/include/asm/kvm_types.h | 7 ++
> arch/x86/kvm/mmu/mmu.c | 129 +++++++++--------------------
> arch/x86/kvm/mmu/paging_tmpl.h | 10 +--
> include/asm-generic/kvm_types.h | 5 ++
> include/linux/kvm_host.h | 7 ++
> include/linux/kvm_types.h | 19 +++++
> virt/kvm/kvm_main.c | 55 ++++++++++++
> 17 files changed, 176 insertions(+), 211 deletions(-)
> create mode 100644 arch/arm64/include/asm/kvm_types.h
> create mode 100644 arch/mips/include/asm/kvm_types.h
> create mode 100644 arch/x86/include/asm/kvm_types.h
> create mode 100644 include/asm-generic/kvm_types.h
>
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