On 30/09/15 12:32, Mark Rutland wrote: > On Wed, Sep 30, 2015 at 11:45:15AM +0100, Julien Grall wrote: >> Hi all, > > Hi, > >> ARM64 Linux is supporting both 4KB and 64KB page granularity. Although, Xen >> hypercall interface and PV protocol are always based on 4KB page granularity. >> >> Any attempt to boot a Linux guest with 64KB pages enabled will result to a >> guest crash. >> >> This series is a first attempt to allow those Linux running with the current >> hypercall interface and PV protocol. >> >> This solution has been chosen because we want to run Linux 64KB in released >> Xen ARM version or/and platform using an old version of Linux DOM0. > > Just to check, would this be expected to work with a 16K DomU (e.g. > [2])? > > From a quick scan it looks like the relaxations provided by this series > should work so long as PAGE_SIZE % XEN_PAGE_SIZE == 0, assuming I > haven't missed something.
Correct, this series is able to cope with any PAGE_SIZE as long as it's a multiple of the granularity used by Xen (i.e 4KB on ARM). >> There is room for improvement, such as support of 64KB grant, modification >> of PV protocol to support different page size... They will be explored in a >> separate patch series later. >> >> TODO list: >> - Convert xenfb to 64KB >> - Support for multiple page ring support >> - Support for 64KB in gnttdev >> - Support of non-indirect grant with 64KB frontend (patch sent [1]) >> - It may be possible to move some common define between >> netback/netfront and blkfront/blkback in an header > > Would any of these require more work to also handle 16K? No. It should just boot on Xen as long as the CPU is support 16K granularity. Regards, -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel