From: Lai Jiangshan <laijs@xxxxxxxxxxxxxxxxx> This patchset uses kvm_vcpu_flush_tlb_guest() instead of kvm_mmu_reset_context() when X86_CR4_PGE is changed or X86_CR4_PCIDE is changed 1->0. Neither X86_CR4_PGE nor X86_CR4_PCIDE participates in kvm_mmu_role, so kvm_mmu_reset_context() is not required to be invoked. Only flushing tlb is required as SDM says. The patchset has nothing to do with performance, because the overheads of kvm_mmu_reset_context() and kvm_vcpu_flush_tlb_guest() are the same. And even in the [near] future, kvm_vcpu_flush_tlb_guest() will be optimized, the code is not in the hot path. This patchset makes the code more clear when to reset the mmu context. And it makes KVM_MMU_CR4_ROLE_BITS consistent with kvm_mmu_role. Lai Jiangshan (2): KVM: X86: Don't reset mmu context when X86_CR4_PCIDE 1->0 KVM: X86: Don't reset mmu context when toggling X86_CR4_PGE arch/x86/kvm/mmu.h | 5 ++--- arch/x86/kvm/x86.c | 7 +++++-- 2 files changed, 7 insertions(+), 5 deletions(-) -- 2.19.1.6.gb485710b
