| Date | Fri, 15 May 2015 11:51:33 -0400 | From | Boris Ostrovsky <> | Subject | Re: [Xen-devel] [RFC 00/23] arm64: Add support for 64KB page granularity in Xen guest |
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On 05/15/2015 11:45 AM, David Vrabel wrote: > On 14/05/15 18:00, Julien Grall wrote: >> Hi all, >> >> 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. > The key problem I see with this approach is the confusion between guest > page size and Xen page size. This is going to be particularly > problematic since the majority of development/usage will remain on x86 > where PAGE_SIZE == XEN_PAGE_SIZE. > > I think it would be nice to keep XEN_PAGE_SIZE etc out of front and > backend drivers. Perhaps with a suitable set of helper functions?
I am thinking exactly the same thing as I am going over these patches.
-boris
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