Hi all, this patch series is part of the work in progress support for Xen on ARMv7 with virtualization extensions in Linux.
It is obviously NOT ready to be accepted upstream but implements enough support to allow Linux Dom0 to receive event channel notifications and initialize xenbus. With this series applied and the corresponding Xen patch series (http://marc.info/?l=xen-devel&m=133001696312879) is possible to boot Linux as Dom0 on Xen on a Versatile Express Cortex A15 emulator and issue basic xl commands, like "xl list" and "xl uptime". "xl create" is still not working though but it is the next on the list :)
Working on this series it became obvious that passing the hypercall number as IMM parameter to HVC is not flexible enough because we don't always know the hypercall number at compile time. As a result I changed the hypercall.h header file to use r12 to pass the hypercall number instead. r12 was chosen because it is defined as "intra-procedure call scratch register" so it seems the most appropriate.
I have CC'ed the KVM list on the first patch because following previous discussions hypercall.h might become a common header file to issue hypercalls on different hypervisors on ARM. I haven't disentangled the Xen specific bits from the generic ones yet, however it should be straightforward.
I am looking forward to hearing your opinions, especially on the hypercall calling convention.
The patch series is available here:
git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git xenarmv7-1
It is based on the vexpress-dt branch of git://xenbits.xen.org/people/dvrabel/linux.git, that we are currently using as development tree for Linux on Xen on Cortex A15. See http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions.
The list of patches with diffstat follows:
Stefano Stabellini (13): xen/arm: use r12 to pass the hypercall number to the hypervisor xen/arm: introduce privcmp, physdev_op and memory_op hypercalls. xen/arm: mmu.h and page.h related definitions xen/arm: sync_bitops xen/arm: empty implementation of grant_table arch specific functions xen/arm: missing includes xen/arm: receive xen events on arm xen/arm: fix arm xen guest handle definitions xen/arm: shared_info and start_info xen/arm: empty implementation of xen_remap_domain_mfn_range xen/arm: Introduce xen_pfn_t for pfn and mfn types xen/arm: compile and run xenbus xen/arm: compile grant-table features events and xenbus, do not compile pci
arch/arm/Kconfig | 4 + arch/arm/include/asm/sync_bitops.h | 17 ++++ arch/arm/include/asm/xen/events.h | 9 ++ arch/arm/include/asm/xen/grant_table.h | 2 + arch/arm/include/asm/xen/hypercall.h | 111 ++++++++++++++++++---------- arch/arm/include/asm/xen/interface.h | 12 +-- arch/arm/include/asm/xen/mmu.h | 61 +++++++++++++++ arch/arm/include/asm/xen/page.h | 14 +++- arch/arm/xen/Makefile | 2 +- arch/arm/xen/enlighten.c | 71 ++++++++++++++++-- arch/arm/xen/grant-table.c | 47 ++++++++++++ arch/ia64/include/asm/xen/interface.h | 3 +- arch/x86/include/asm/xen/interface.h | 3 + drivers/xen/Makefile | 7 +- drivers/xen/events.c | 36 +++++++++- drivers/xen/grant-table.c | 2 + drivers/xen/xenbus/xenbus_client.c | 1 + drivers/xen/xenbus/xenbus_comms.c | 2 +- drivers/xen/xenbus/xenbus_probe.c | 26 ++++--- drivers/xen/xenbus/xenbus_probe_frontend.c | 1 + drivers/xen/xenbus/xenbus_xs.c | 3 +- drivers/xen/xenfs/xenstored.c | 1 + include/xen/interface/grant_table.h | 4 +- include/xen/interface/memory.h | 6 +- include/xen/interface/platform.h | 4 +- include/xen/interface/xen.h | 6 +- include/xen/privcmd.h | 3 +- include/xen/xen.h | 2 +- 28 files changed, 371 insertions(+), 89 deletions(-)
Cheers,
Stefano