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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v5 00/22] xen/arm64: Add support for 64KB page in Linux
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. > 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? Thanks, Mark. [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-September/370117.html > I've got most of the patches for the TODO items. I'm planning to send them as > a follow-up as it's not a requirement for a basic guests. > > All patches has been built tested for ARM32, ARM64, x86. But I haven't tested > to run it on x86 as I don't have a box with Xen x86 running. Although, 99% > of the changes has been made in the PV drivers there should be no specific > issue. Although, I would be happy if someone give a try and see possible > regression for x86. > > I know that Konrad as a test-suite for x86. Konrand, would it be possible to > give a run to for this series? > > A branch based on the latest xentip/for-linus-4.4 can be found here: > > git://xenbits.xen.org/people/julieng/linux-arm.git branch xen-64k-v5 > > There is no major changes in this series, only a couple of conflict during > rebase in netback and balloon drivers. For those pathces, I've keept the > reviewed-by/acked-by from Wei and Stefano. Let me know if it's not fine. > > I also fold the swiotlb patch series into this series because it has been > reviewed by Stefano and I don't think there is much controversy (see patch #21 > and #22). > > Comments, suggestions are welcomed. > > Sincerely yours, > > [1] https://lkml.org/lkml/2015/9/11/567 > > Cc: david.vrabel@xxxxxxxxxx > Cc: konrad.wilk@xxxxxxxxxx > Cc: boris.ostrovsky@xxxxxxxxxx > Cc: wei.liu2@xxxxxxxxxx > Cc: roger.pau@xxxxxxxxxx > > Status of each patch: > > A: Reviewed-by - Acked-by > M: Patch modified in this series > m: Minor changes in this series due to conflict during rebase > L: Missing Acked-by from a Linux maintainers (Boris, David or Konrad) > > Julien Grall (22): > A net/xen-netback: xenvif_gop_frag_copy: move GSO check out of the loop > A arm/xen: Drop pte_mfn and mfn_pte > A L xen: Add Xen specific page definition > A xen/grant: Introduce helpers to split a page into grant > A xen/grant: Add helper gnttab_page_grant_foreign_access_ref_one > A block/xen-blkfront: Split blkif_queue_request in 2 > A block/xen-blkfront: Store a page rather a pfn in the grant structure > A block/xen-blkfront: split get_grant in 2 > A L xen/biomerge: Don't allow biovec's to be merged when Linux is not > using 4KB pages > A xen/xenbus: Use Xen page definition > A L tty/hvc: xen: Use xen page definition > A m L xen/balloon: Don't rely on the page granularity is the same for Xen > and Linux > A xen/events: fifo: Make it running on 64KB granularity > A xen/grant-table: Make it running on 64KB granularity > A block/xen-blkfront: Make it running on 64KB page granularity > A block/xen-blkback: Make it running on 64KB page granularity > A net/xen-netfront: Make it running on 64KB page granularity > A m net/xen-netback: Make it running on 64KB page granularity > A xen/privcmd: Add support for Linux 64KB page granularity > A arm/xen: Add support for 64KB page granularity > A m L xen/swiotlb: Pass addresses rather than frame numbers to > xen_arch_need_swiotlb > A L xen/swiotlb: Add support for 64KB page granularity > > arch/arm/include/asm/xen/page-coherent.h | 26 +- > arch/arm/include/asm/xen/page.h | 22 +- > arch/arm/xen/enlighten.c | 6 +- > arch/arm/xen/mm.c | 39 ++- > arch/arm/xen/p2m.c | 6 +- > arch/x86/include/asm/xen/page.h | 6 +- > drivers/block/xen-blkback/blkback.c | 5 +- > drivers/block/xen-blkback/common.h | 17 +- > drivers/block/xen-blkback/xenbus.c | 9 +- > drivers/block/xen-blkfront.c | 552 > ++++++++++++++++++++----------- > drivers/net/xen-netback/common.h | 16 +- > drivers/net/xen-netback/netback.c | 167 ++++++---- > drivers/net/xen-netfront.c | 122 +++++-- > drivers/tty/hvc/hvc_xen.c | 4 +- > drivers/xen/balloon.c | 69 +++- > drivers/xen/biomerge.c | 8 + > drivers/xen/events/events_base.c | 2 +- > drivers/xen/events/events_fifo.c | 2 +- > drivers/xen/grant-table.c | 32 +- > drivers/xen/privcmd.c | 8 +- > drivers/xen/swiotlb-xen.c | 43 ++- > drivers/xen/xenbus/xenbus_client.c | 6 +- > drivers/xen/xenbus/xenbus_probe.c | 3 +- > drivers/xen/xlate_mmu.c | 124 ++++--- > include/xen/grant_table.h | 51 +++ > include/xen/page.h | 27 +- > 26 files changed, 937 insertions(+), 435 deletions(-) > > -- > 2.1.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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