On Fri, Jun 15, 2012 at 03:08:22PM -0400, Christoffer Dall wrote: > From: Christoffer Dall <cdall at cs.columbia.edu> > > This commit introduces the framework for guest memory management > through the use of 2nd stage translation. Each VM has a pointer > to a level-1 table (the pgd field in struct kvm_arch) which is > used for the 2nd stage translations. Entries are added when handling > guest faults (later patch) and the table itself can be allocated and > freed through the following functions implemented in > arch/arm/kvm/arm_mmu.c: > - kvm_alloc_stage2_pgd(struct kvm *kvm); > - kvm_free_stage2_pgd(struct kvm *kvm); > > Further, each entry in TLBs and caches are tagged with a VMID > identifier in addition to ASIDs. The VMIDs are assigned consecutively > to VMs in the order that VMs are executed, and caches and tlbs are > invalidated when the VMID space has been used to allow for more than > 255 simultaenously running guests. > > The 2nd stage pgd is allocated in kvm_arch_init_vm(). The table is > freed in kvm_arch_destroy_vm(). Both functions are called from the main > KVM code. > > Signed-off-by: Christoffer Dall <c.dall at virtualopensystems.com> Can you explain on a high level how the IPA -> PA mappings work?
