On Tue, Mar 08, 2022 at 04:20:53PM +0800, Jason Wang wrote: > > Not by itself but I'm not sure we can guarantee guest will not > > attempt to use the IOVA addresses we are reserving down > > the road. > > The IOVA is allocated via the listeners and stored in the iova tree > per GPA range as IOVA->(GPA)->HVA.Guests will only see GPA, Qemu > virtio core see GPA to HVA mapping. And we do a reverse lookup to find > the HVA->IOVA we allocated previously. So we have double check here: > > 1) Qemu memory core to make sure the GPA that guest uses is valid > 2) the IOVA tree that guarantees there will be no HVA beyond what > guest can see is used > > So technically, there's no way for the guest to use the IOVA address > allocated for the shadow virtqueue. > > Thanks
I mean, IOVA is programmed in the host hardware to translate to HPA, right? -- MST
