Linux-Kernel Archive: [PATCH v6 00/29] KVM: Scalable memslots implementation [PATCH v6 00/29] KVM: Scalable memslots implementation From: Maciej S. Szmigiero Date: Tue Nov 30 2021 - 16:44:52 EST Next message: Maciej S. Szmigiero: "[PATCH v6 01/29] KVM: Require total number of memslot pages to fit in an unsigned long" Previous message: Tom Zanussi: "Re: [PATCH v3 2/2] tracing: Have existing event_command implementations use helpers" Next in thread: Maciej S. Szmigiero: "[PATCH v6 02/29] KVM: Open code kvm_delete_memslot() into its only caller" Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] From: "Maciej S. Szmigiero" This series contains the sixth iteration of the scalable memslots patch set. It is based on Sean's version "5.5", but with integrated patches for issues that arose during its review round. In addition to that, the kvm_for_each_memslot_in_gfn_range() implementation was reworked to return only strictly overlapping memslots and to use iterators. However, I've dropped a similar kvm_for_each_memslot_in_hva_range() rework since the existing implementation was already returning only strictly overlapping memslots and it was already based on interval tree iterators, so wrapping them in another layer of iterators would only add unnecessary complexity. The code in this "for"-like macro is also self-contained and very simple, so let's keep it this way. The series was tested on x86 with KASAN on and booted various guests successfully (including nested ones; with TDP MMU both enabled and disabled). Sean's previous version (5.5) is available here: [1]: https://lore.kernel.org/kvm/20211104002531.1176691-1-seanjc@xxxxxxxxxx/ Changes from v5.5: * Note open-coding of kvm_copy_memslots() in the commit message of patch 3, * When changing kvm_arch_prepare_memory_region() signature change it also in the RISC-V implementation of this function in patch 5, * Avoid overflowing "nr_mmu_pages" in patch 18, * Add a comment to the "slot id to memslot" hash table declaration explaining its bucket count in patch 21, * Don't check twice for "old" being != NULL in kvm_replace_memslot() in patch 21, * Remove unnecessary "new" NULL check in kvm_replace_memslot() in patch 22, * Split out changing kvm_invalidate_memslot() to call kvm_arch_flush_shadow_memslot() on an old slot from patch 24 to a separate patch 25, * Make kvm_for_each_memslot_in_gfn_range() return only strictly overlapping memslots and rewrite its implementation to use iterators in patch 26. Maciej S. Szmigiero (12): KVM: Resync only arch fields when slots_arch_lock gets reacquired KVM: x86: Don't call kvm_mmu_change_mmu_pages() if the count hasn't changed KVM: x86: Use nr_memslot_pages to avoid traversing the memslots array KVM: Integrate gfn_to_memslot_approx() into search_memslots() KVM: Move WARN on invalid memslot index to update_memslots() KVM: Resolve memslot ID via a hash table instead of via a static array KVM: Use interval tree to do fast hva lookup in memslots KVM: s390: Introduce kvm_s390_get_gfn_end() KVM: Keep memslots in tree-based structures instead of array-based ones KVM: Call kvm_arch_flush_shadow_memslot() on the old slot in kvm_invalidate_memslot() KVM: Optimize gfn lookup in kvm_zap_gfn_range() KVM: Optimize overlapping memslots check Sean Christopherson (17): KVM: Require total number of memslot pages to fit in an unsigned long KVM: Open code kvm_delete_memslot() into its only caller KVM: Use "new" memslot's address space ID instead of dedicated param KVM: Let/force architectures to deal with arch specific memslot data KVM: arm64: Use "new" memslot instead of userspace memory region KVM: MIPS: Drop pr_debug from memslot commit to avoid using "mem" KVM: PPC: Avoid referencing userspace memory region in memslot updates KVM: s390: Use "new" memslot instead of userspace memory region KVM: x86: Use "new" memslot instead of userspace memory region KVM: RISC-V: Use "new" memslot instead of userspace memory region KVM: Stop passing kvm_userspace_memory_region to arch memslot hooks KVM: Use prepare/commit hooks to handle generic memslot metadata updates KVM: x86: Don't assume old/new memslots are non-NULL at memslot commit KVM: s390: Skip gfn/size sanity checks on memslot DELETE or FLAGS_ONLY KVM: Don't make a full copy of the old memslot in __kvm_set_memory_region() KVM: Wait 'til the bitter end to initialize the "new" memslot KVM: Dynamically allocate "new" memslots from the get-go arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/mmu.c | 27 +- arch/mips/kvm/Kconfig | 1 + arch/mips/kvm/mips.c | 9 +- arch/powerpc/include/asm/kvm_ppc.h | 14 +- arch/powerpc/kvm/Kconfig | 1 + arch/powerpc/kvm/book3s.c | 14 +- arch/powerpc/kvm/book3s_64_mmu_hv.c | 4 +- arch/powerpc/kvm/book3s_hv.c | 28 +- arch/powerpc/kvm/book3s_hv_nested.c | 4 +- arch/powerpc/kvm/book3s_hv_uvmem.c | 14 +- arch/powerpc/kvm/book3s_pr.c | 9 +- arch/powerpc/kvm/booke.c | 7 +- arch/powerpc/kvm/powerpc.c | 9 +- arch/riscv/kvm/mmu.c | 31 +- arch/s390/kvm/Kconfig | 1 + arch/s390/kvm/kvm-s390.c | 98 ++-- arch/s390/kvm/kvm-s390.h | 14 + arch/s390/kvm/pv.c | 4 +- arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/Kconfig | 1 + arch/x86/kvm/debugfs.c | 6 +- arch/x86/kvm/mmu/mmu.c | 38 +- arch/x86/kvm/x86.c | 41 +- include/linux/kvm_host.h | 277 ++++++--- virt/kvm/kvm_main.c | 835 ++++++++++++++++------------ 26 files changed, 854 insertions(+), 637 deletions(-) Next message: Maciej S. Szmigiero: "[PATCH v6 01/29] KVM: Require total number of memslot pages to fit in an unsigned long" Previous message: Tom Zanussi: "Re: [PATCH v3 2/2] tracing: Have existing event_command implementations use helpers" Next in thread: Maciej S. Szmigiero: "[PATCH v6 02/29] KVM: Open code kvm_delete_memslot() into its only caller" Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
