On Friday, October 31, 2008 5:30 am Matthew Wilcox wrote: > On Fri, Oct 31, 2008 at 02:49:30PM +0900, Yuji Shimada wrote: > > I created this patch for xen's dom0 linux. It is useful when we assign > > I/O device to HVM domain using pci passthrough, because page-aligned > > memory resource is required for pci passthrough. But I heard it is > > also useful for KVM. So I submit it to linux-pci ML. > > > > On many system, BIOS assigns memory resources to the device and > > enables it. So my patch disables the device, and releases memory > > resources. Then it assigns page-aligned memory resource to the device. > > > > To reassign page-aligned memory resources to device, please add boot > > parameters of linux as follows. > > > > reassigndev=00:1d.7,01:00.0 > > > > reassigndev= Specifies device to reassign page-aligned > > memory resources. PCI-PCI bridge can be > > specified, if resource windows need to be > > expanded. > > It seems unreasonably restrictive to have to specify this at boot time. > We do have some infrastructure for resizing and moving resource windows. > Perhaps you could investigate a method for reassigning resources at > runtime? Yeah you should be able to modify resource_alignment to choose the smaller of resource_size and PAGE_SIZE if that's what you need (possibly wrapping the call where you need it rather that modifying kernel/resource.c directly). -- Jesse Barnes, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
