On 27/10/14 14:52, Juergen Gross wrote: > Paravirtualized kernels running on Xen use a three level tree for > translation of guest specific physical addresses to machine global > addresses. This p2m tree is used for construction of page table > entries, so the p2m tree walk is performance critical. > > By using a linear virtual mapped p2m list accesses to p2m elements > can be sped up while even simplifying code. To achieve this goal > some p2m related initializations have to be performed later in the > boot process, as the final p2m list can be set up only after basic > memory management functions are available.
What impact does this have on 32-bit guests which don't have huge amount of virtual address space? I think a 32-bit guest could have up to 64 GiB of PFNs, which would require a 128 MiB p2m array, which is too large? David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/