Hi, This series build up based on the feedback on v3. Biggest change in features is to enable NUMA aware page table per VM basis instead of using a module parameter for all VMs on a host. This was decided based on an internal discussion to avoid forcing all VMs to be NUMA aware on a host. We need to collect more data to see how much performance degradation a VM can get in negative testing, where vCPUs in VM are always accessing remote NUMA nodes memory instead of staying local compared to a VM which is not NUMA aware. There are other changes which are mentioned in the change log below for v4. Thanks Vipin v4: - Removed module parameter for enabling NUMA aware page table. - Added new capability KVM_CAP_NUMA_AWARE_PAGE_TABLE to enable this feature per VM. - Added documentation for the new capability. - Holding mutex just before the top up and releasing it after the fault/split is addressed. Previous version were using spinlocks two times, first time for topup and second time fetching the page from cache. - Using the existing slots_lock for split_shadow_page_cache operations. - KVM MMU shrinker will also shrink mm_shadow_info_cache besides split_shadow_page_cache and mmu_shadow_page_cache. - Reduced cache default size to 4. - Split patches into smaller ones. v3: https://lore.kernel.org/lkml/20221222023457.1764-1-vipinsh@xxxxxxxxxx/ - Split patches into smaller ones. - Repurposed KVM MMU shrinker to free cache pages instead of oldest page table pages - Reduced cache size from 40 to 5 - Removed __weak function and initializing node value in all architectures. - Some name changes. v2: https://lore.kernel.org/lkml/20221201195718.1409782-1-vipinsh@xxxxxxxxxx/ - All page table pages will be allocated on underlying physical page's NUMA node. - Introduced module parameter, numa_aware_pagetable, to disable this feature. - Using kvm_pfn_to_refcounted_page to get page from a pfn. v1: https://lore.kernel.org/all/20220801151928.270380-1-vipinsh@xxxxxxxxxx/ Vipin Sharma (18): KVM: x86/mmu: Change KVM mmu shrinker to no-op KVM: x86/mmu: Remove zapped_obsolete_pages from struct kvm_arch{} KVM: x86/mmu: Track count of pages in KVM MMU page caches globally KVM: x86/mmu: Shrink shadow page caches via MMU shrinker KVM: x86/mmu: Add split_shadow_page_cache pages to global count of MMU cache pages KVM: x86/mmu: Shrink split_shadow_page_cache via MMU shrinker KVM: x86/mmu: Unconditionally count allocations from MMU page caches KVM: x86/mmu: Track unused mmu_shadowed_info_cache pages count via global counter KVM: x86/mmu: Shrink mmu_shadowed_info_cache via MMU shrinker KVM: x86/mmu: Add per VM NUMA aware page table capability KVM: x86/mmu: Add documentation of NUMA aware page table capability KVM: x86/mmu: Allocate NUMA aware page tables on TDP huge page splits KVM: mmu: Add common initialization logic for struct kvm_mmu_memory_cache{} KVM: mmu: Initialize kvm_mmu_memory_cache.gfp_zero to __GFP_ZERO by default KVM: mmu: Add NUMA node support in struct kvm_mmu_memory_cache{} KVM: x86/mmu: Allocate numa aware page tables during page fault KVM: x86/mmu: Allocate shadow mmu page table on huge page split on the same NUMA node KVM: x86/mmu: Reduce default mmu memory cache size Documentation/virt/kvm/api.rst | 29 +++ arch/arm64/kvm/arm.c | 2 +- arch/arm64/kvm/mmu.c | 2 +- arch/mips/kvm/mips.c | 3 + arch/riscv/kvm/mmu.c | 8 +- arch/riscv/kvm/vcpu.c | 2 +- arch/x86/include/asm/kvm_host.h | 17 +- arch/x86/include/asm/kvm_types.h | 6 +- arch/x86/kvm/mmu/mmu.c | 319 +++++++++++++++++++------------ arch/x86/kvm/mmu/mmu_internal.h | 38 ++++ arch/x86/kvm/mmu/paging_tmpl.h | 29 +-- arch/x86/kvm/mmu/tdp_mmu.c | 23 ++- arch/x86/kvm/x86.c | 18 +- include/linux/kvm_host.h | 2 + include/linux/kvm_types.h | 21 ++ include/uapi/linux/kvm.h | 1 + virt/kvm/kvm_main.c | 24 ++- 17 files changed, 386 insertions(+), 158 deletions(-) -- 2.40.0.rc0.216.gc4246ad0f0-goog
