On 11/13/2011 02:27 PM, Xin Tong wrote: > I am investigating how INVLPG is emulated in kvm.
You're on the wrong list. > It turns out that it calls > > kvm_mmu_invlpg > kvm_mmu_flush_tlb > kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); > > and the kvm_make_request set the vcpu->requests bit to high, when the > guest os resumes, it handles the bit. I have 2 questions > > > 1. How does the make_request mechanism work ? See vcpu_enter_guest(). > how does the guest > handle the requests ? The guest never sees them, this is all internal to kvm. > 2. INVLPG invalidates a tlb entry, it is typically used when the page > table changes. However, an ipi is typically used to invalidate the tlb > entries in other processor cores, However, i can not find the > emulation code for IPI instruction. There is no IPI instruction, see lapic.c:apic_send_ipi(). -- error compiling committee.c: too many arguments to function
