For the description of the "why" of this patch, I'll just direct you to David's excellent cover letter from v6, which can be found at https://lore.kernel.org/r/20220516232138.1783324-1-dmatlack@xxxxxxxxxx. This version mostly does the following: - apply the feedback from Sean and other reviewers, which is mostly aesthetic - replace the refactoring of drop_large_spte()/__drop_large_spte() with my own version. The insight there is that drop_large_spte() is always followed by {,__}link_shadow_page(), so the call is moved there - split the TLB flush optimization into a separate patch, mostly to perform the previous refactoring independent of the optional TLB flush - rename a few functions from *nested_mmu* to *shadow_mmu* David Matlack (21): KVM: x86/mmu: Optimize MMU page cache lookup for all direct SPs KVM: x86/mmu: Use a bool for direct KVM: x86/mmu: Stop passing "direct" to mmu_alloc_root() KVM: x86/mmu: Derive shadow MMU page role from parent KVM: x86/mmu: Always pass 0 for @quadrant when gptes are 8 bytes KVM: x86/mmu: Decompose kvm_mmu_get_page() into separate functions KVM: x86/mmu: Consolidate shadow page allocation and initialization KVM: x86/mmu: Rename shadow MMU functions that deal with shadow pages KVM: x86/mmu: Move guest PT write-protection to account_shadowed() KVM: x86/mmu: Pass memory caches to allocate SPs separately KVM: x86/mmu: Replace vcpu with kvm in kvm_mmu_alloc_shadow_page() KVM: x86/mmu: Pass kvm pointer separately from vcpu to kvm_mmu_find_shadow_page() KVM: x86/mmu: Allow NULL @vcpu in kvm_mmu_find_shadow_page() KVM: x86/mmu: Pass const memslot to rmap_add() KVM: x86/mmu: Decouple rmap_add() and link_shadow_page() from kvm_vcpu KVM: x86/mmu: Update page stats in __rmap_add() KVM: x86/mmu: Cache the access bits of shadowed translations KVM: x86/mmu: Extend make_huge_page_split_spte() for the shadow MMU KVM: x86/mmu: Zap collapsible SPTEs in shadow MMU at all possible levels KVM: Allow for different capacities in kvm_mmu_memory_cache structs KVM: x86/mmu: Extend Eager Page Splitting to nested MMUs Paolo Bonzini (2): KVM: x86/mmu: pull call to drop_large_spte() into __link_shadow_page() KVM: x86/mmu: Avoid unnecessary flush on eager page split .../admin-guide/kernel-parameters.txt | 3 +- arch/arm64/kvm/mmu.c | 2 +- arch/riscv/kvm/mmu.c | 5 +- arch/x86/include/asm/kvm_host.h | 24 +- arch/x86/kvm/mmu/mmu.c | 719 ++++++++++++++---- arch/x86/kvm/mmu/mmu_internal.h | 17 +- arch/x86/kvm/mmu/paging_tmpl.h | 43 +- arch/x86/kvm/mmu/spte.c | 15 +- arch/x86/kvm/mmu/spte.h | 4 +- arch/x86/kvm/mmu/tdp_mmu.c | 2 +- include/linux/kvm_host.h | 1 + include/linux/kvm_types.h | 6 +- virt/kvm/kvm_main.c | 33 +- 13 files changed, 666 insertions(+), 208 deletions(-) -- 2.31.1
