This series refines mmu zap caused by EPT memory type update. The first 3 patches will only do mmu zap when the target is to update memory type of EPT entries by introducing a help in patch 1 to skip non-EPT cases. The 4th patch will trigger zapping of EPT leaf entries if non-coherent DMA devices count goes from 0 to 1 or from 1 to 0. The 5th-6th patches reduces EPT zap count by introducing a per-VM based guest MTRR and only zap EPT entries when this per-VM based guest MTRR changes. Changelog: v1 --> v2: 1. Added a helper to skip non EPT case in patch 1 2. Added patch 2 to skip mmu zap when guest CR0_CD changes if EPT is not enabled. (Chao Gao) 3. Added patch 3 to skip mmu zap when guest MTRR changes if EPT is not enabled. 4. Do not mention TDX in patch 4 as the code is not merged yet (Chao Gao) 5. Added patches 5-6 to reduce EPT zap during guest bootup. v1: https://lore.kernel.org/all/20230508034700.7686-1-yan.y.zhao@xxxxxxxxx/ Yan Zhao (6): KVM: x86/mmu: add a new mmu zap helper to indicate memtype changes KVM: x86/mmu: only zap EPT when guest CR0_CD changes KVM: x86/mmu: only zap EPT when guest MTRR changes KVM: x86/mmu: Zap all EPT leaf entries according noncoherent DMA count KVM: x86: Keep a per-VM MTRR state KVM: x86/mmu: use per-VM based MTRR for EPT arch/x86/include/asm/kvm_host.h | 3 + arch/x86/kvm/mmu.h | 1 + arch/x86/kvm/mmu/mmu.c | 18 ++++- arch/x86/kvm/mtrr.c | 112 +++++++++++++++++++++++++------- arch/x86/kvm/vmx/vmx.c | 2 +- arch/x86/kvm/x86.c | 10 ++- arch/x86/kvm/x86.h | 6 +- 7 files changed, 122 insertions(+), 30 deletions(-) base-commit: 5c291b93e5d665380dbecc6944973583f9565ee5 -- 2.17.1
