On 06/09/2018 15:32, Liran Alon wrote: > Hi, > > This patch series aim to enhance L1<->L2 transitions to avoid > unnecessary TLB flushes in case L1 uses VPID and EPT. > > The 1st patch fixes a bug that INVEPT was executed on L1<->L2 > transitions to flush TLB but with the wrong EPTP because it hasn't been > loaded yet with the destination EPTP. The patch handles this issue > easily by just delaying vmx_flush_tlb() to be called after EPTP has been > set to destination by using KVM_REQ_TLB_FLUSH. > > The 2nd patch avoids unnecessary flushing TLB on L2->L1 VMExit if L1 > uses VPID and EPT. This is because TLB entries of L1 and L2 are > separated by the fact they are tagged with different EPTP. > > The 3rd patch modifies L1->L2 VMEntry code such that it will set > vmcs02->vpid to vmcs12->vpid in case L1 uses EPT. This leverages the > fact TLB entries of L1 and L2 are separated by being tagged with > different EPTPs and therefore we don't need to use the special vpid02. > > The 4rd patch then modifies L1->L2 VMEntry code to avoid unnecessary > flushing TLB in case L1 uses both VPID and EPT as TLB entries of L1 and > L2 are separated by different EPTP tags. Queued patches 1-2-4, thanks. Paolo
