[PATCH v2 00/23] Introduce Xen support on ARM

Stefano Stabellini
2012-08-06T14:25:40Z

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Hi all,
this patch series implements Xen support for ARMv7 with virtualization
extensions. It allows a Linux guest to boot as dom0 and
as domU on Xen on ARM. PV console, disk and network frontends and
backends are all working correctly.

It has been tested on a Versatile Express Cortex A15 emulator, using the
latest Xen ARM developement branch
(git://xenbits.xen.org/people/ianc/xen-unstable.git arm-for-4.3) plus
the "ARM hypercall ABI: 64 bit ready" patch series
(http://marc.info/?l=xen-devel&m=134426267205408), and a simple ad-hoc
tool to build guest domains (marc.info/?l=xen-devel&m=134089788016546).

The patch marked with [HACK] shouldn't be applied and is part of the
series only because it is needed to create domUs.

I am also attaching to this email the dts'es that I am currently using
for dom0 and domU: vexpress-v2p-ca15-tc1.dts (that includes
vexpress-v2m-rs1-rtsm.dtsi) is the dts used for dom0 and it is passed to
Linux by Xen, while vexpress-virt.dts is the dts used for other domUs
and it is appended in binary form to the guest kernel image. I am not
sure where they are supposed to live yet, so I am just attaching them
here so that people can actually try out this series if they want to.

Comments are very welcome!

Changes in v2:
- fix up many comments and commit messages;
- remove the early_printk patches: rely on the emulated serial for now;
- remove the xen_guest_init patch: without any PV early_printk, we don't
need any early call to xen_guest_init, we can rely on core_initcall
alone;
- define an HYPERCALL macro for 5 arguments hypercall wrappers, even if
at the moment is unused;
- use ldm instead of pop in the hypercall wrappers;
- return -ENOSYS rather than -1 from the unimplemented grant_table
functions;
- remove the pvclock ifdef in the Xen headers;
- remove include linux/types.h from xen/interface/xen.h;
- replace pr_info with pr_debug in xen_guest_init;
- add a new patch to introduce xen_ulong_t and use it top replace all
the occurences of unsigned long in the public Xen interface;
- explicitely size all the pointers to 64 bit on ARM, so that the
hypercall ABI is "64 bit ready";
- clean up xenbus_init;
- make pci.o depend on CONFIG_PCI and acpi.o depend on CONFIG_ACPI;
- mark Xen guest support on ARM as EXPERIMENTAL;
- introduce GRANT_TABLE_PHYSADDR;
- remove unneeded initialization of boot_max_nr_grant_frames;
- add a new patch to clear IRQ_NOAUTOEN and IRQ_NOREQUEST in events.c;
- return -EINVAL from xen_remap_domain_mfn_range if
auto_translated_physmap;
- retain binary compatibility in xen_add_to_physmap: use a union to
introduce foreign_domid.

Ian Campbell (1):
[HACK] xen/arm: implement xen_remap_domain_mfn_range

Stefano Stabellini (22):
arm: initial Xen support
xen/arm: hypercalls
xen/arm: page.h definitions
xen/arm: sync_bitops
xen/arm: empty implementation of grant_table arch specific functions
xen: missing includes
xen/arm: Xen detection and shared_info page mapping
xen/arm: Introduce xen_pfn_t for pfn and mfn types
xen/arm: Introduce xen_ulong_t for unsigned long
xen/arm: compile and run xenbus
xen: do not compile manage, balloon, pci, acpi and cpu_hotplug on ARM
xen/arm: introduce CONFIG_XEN on ARM
xen/arm: get privilege status
xen/arm: initialize grant_table on ARM
xen/arm: receive Xen events on ARM
xen: clear IRQ_NOAUTOEN and IRQ_NOREQUEST
xen/arm: implement alloc/free_xenballooned_pages with alloc_pages/kfree
xen: allow privcmd for HVM guests
xen/arm: compile blkfront and blkback
xen/arm: compile netback
xen: update xen_add_to_physmap interface
arm/v2m: initialize arch_timers even if v2m_timer is not present

arch/arm/Kconfig | 10 ++
arch/arm/Makefile | 1 +
arch/arm/include/asm/hypervisor.h | 6 +
arch/arm/include/asm/sync_bitops.h | 27 +++
arch/arm/include/asm/xen/events.h | 18 ++
arch/arm/include/asm/xen/hypercall.h | 69 ++++++++
arch/arm/include/asm/xen/hypervisor.h | 19 +++
arch/arm/include/asm/xen/interface.h | 72 +++++++++
arch/arm/include/asm/xen/page.h | 79 +++++++++
arch/arm/mach-vexpress/v2m.c | 11 +-
arch/arm/xen/Makefile | 1 +
arch/arm/xen/enlighten.c | 237 ++++++++++++++++++++++++++++
arch/arm/xen/grant-table.c | 53 ++++++
arch/arm/xen/hypercall.S | 106 +++++++++++++
arch/ia64/include/asm/xen/interface.h | 6 +-
arch/x86/include/asm/xen/interface.h | 8 +
arch/x86/xen/enlighten.c | 1 +
arch/x86/xen/irq.c | 1 +
arch/x86/xen/mmu.c | 3 +
arch/x86/xen/xen-ops.h | 1 -
drivers/block/xen-blkback/blkback.c | 1 +
drivers/net/xen-netback/netback.c | 1 +
drivers/net/xen-netfront.c | 1 +
drivers/tty/hvc/hvc_xen.c | 2 +
drivers/xen/Makefile | 11 +-
drivers/xen/events.c | 18 ++-
drivers/xen/grant-table.c | 1 +
drivers/xen/privcmd.c | 20 +--
drivers/xen/xenbus/xenbus_comms.c | 2 +-
drivers/xen/xenbus/xenbus_probe.c | 62 +++++---
drivers/xen/xenbus/xenbus_probe_frontend.c | 1 +
drivers/xen/xenbus/xenbus_xs.c | 1 +
drivers/xen/xenfs/super.c | 7 +
include/xen/events.h | 2 +
include/xen/interface/features.h | 3 +
include/xen/interface/grant_table.h | 4 +-
include/xen/interface/io/protocols.h | 3 +
include/xen/interface/memory.h | 32 +++--
include/xen/interface/physdev.h | 4 +-
include/xen/interface/platform.h | 4 +-
include/xen/interface/version.h | 2 +-
include/xen/interface/xen.h | 13 +-
include/xen/privcmd.h | 3 +-
include/xen/xen.h | 2 +-
44 files changed, 857 insertions(+), 72 deletions(-)

A branch based on 3.5-rc7 is available here:

git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 3.5-rc7-arm-2

Cheers,

Stefano

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/*
* ARM Ltd. Versatile Express
*
* ARM Envelope Model v7A (single CPU).
*/

/dts-v1/;

/include/ "skeleton.dtsi"

/ {
model = "V2P-AEMv7A";
compatible = "arm,vexpress,v2p-aem,v7a", "arm,vexpress,v2p-aem", "arm,vexpress";
interrupt-parent = <&gic>;

chosen {
bootargs = "earlyprintk debug loglevel=9 console=hvc0 root=/dev/xvda init=/sbin/init";
};

cpus {
#address-cells = <1>;
#size-cells = <0>;

cpu@0 {
device_type = "cpu";
compatible = "arm,cortex-a15";
reg = <0>;
};
};

memory {
device_type = "memory";
reg = <0x80000000 0x08000000>;
};

gic: interrupt-controller@2c001000 {
compatible = "arm,cortex-a9-gic";
#interrupt-cells = <3>;
#address-cells = <0>;
interrupt-controller;
reg = <0x2c001000 0x1000>,
<0x2c002000 0x100>;
};

timer {
compatible = "arm,armv7-timer";
interrupts = <1 13 0xf08>,
<1 14 0xf08>,
<1 11 0xf08>,
<1 10 0xf08>;
};

xen {
compatible = "arm,xen";
reg = <0xb0000000 0x20000>;
interrupts = <1 15 0xf08>;
};

motherboard {
arm,v2m-memory-map = "rs1";
ranges = <0 0 0x08000000 0x04000000>,
<1 0 0x14000000 0x04000000>,
<2 0 0x18000000 0x04000000>,
<3 0 0x1c000000 0x04000000>,
<4 0 0x0c000000 0x04000000>,
<5 0 0x10000000 0x04000000>;

interrupt-map-mask = <0 0 63>;
interrupt-map = <0 0 0 &gic 0 0 4>,
<0 0 1 &gic 0 1 4>,
<0 0 2 &gic 0 2 4>,
<0 0 3 &gic 0 3 4>,
<0 0 4 &gic 0 4 4>,
<0 0 5 &gic 0 5 4>,
<0 0 6 &gic 0 6 4>,
<0 0 7 &gic 0 7 4>,
<0 0 8 &gic 0 8 4>,
<0 0 9 &gic 0 9 4>,
<0 0 10 &gic 0 10 4>,
<0 0 11 &gic 0 11 4>,
<0 0 12 &gic 0 12 4>,
<0 0 13 &gic 0 13 4>,
<0 0 14 &gic 0 14 4>,
<0 0 15 &gic 0 15 4>,
<0 0 16 &gic 0 16 4>,
<0 0 17 &gic 0 17 4>,
<0 0 18 &gic 0 18 4>,
<0 0 19 &gic 0 19 4>,
<0 0 20 &gic 0 20 4>,
<0 0 21 &gic 0 21 4>,
<0 0 22 &gic 0 22 4>,
<0 0 23 &gic 0 23 4>,
<0 0 24 &gic 0 24 4>,
<0 0 25 &gic 0 25 4>,
<0 0 26 &gic 0 26 4>,
<0 0 27 &gic 0 27 4>,
<0 0 28 &gic 0 28 4>,
<0 0 29 &gic 0 29 4>,
<0 0 30 &gic 0 30 4>,
<0 0 31 &gic 0 31 4>,
<0 0 32 &gic 0 32 4>,
<0 0 33 &gic 0 33 4>,
<0 0 34 &gic 0 34 4>,
<0 0 35 &gic 0 35 4>,
<0 0 36 &gic 0 36 4>,
<0 0 37 &gic 0 37 4>,
<0 0 38 &gic 0 38 4>,
<0 0 39 &gic 0 39 4>,
<0 0 40 &gic 0 40 4>,
<0 0 41 &gic 0 41 4>,
<0 0 42 &gic 0 42 4>;
};
};

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/*
* ARM Ltd. Versatile Express
*
* CoreTile Express A15x2 (version with Test Chip 1)
* Cortex-A15 MPCore (V2P-CA15)
*
* HBI-0237A
*/

/dts-v1/;

/ {
model = "V2P-CA15";
arm,hbi = <0x237>;
compatible = "arm,vexpress,v2p-ca15,tc1", "arm,vexpress,v2p-ca15", "arm,vexpress";

#address-cells = <1>;
#size-cells = <1>;

interrupt-parent = <&gic>;

chosen {
bootargs = "dom0_mem=128M";
xen,dom0-bootargs = "earlyprintk console=ttyAMA1 root=/dev/mmcblk0 debug rw";
};

aliases {
serial0 = &v2m_serial0;
serial1 = &v2m_serial1;
serial2 = &v2m_serial2;
serial3 = &v2m_serial3;
i2c0 = &v2m_i2c_dvi;
i2c1 = &v2m_i2c_pcie;
};

cpus {
#address-cells = <1>;
#size-cells = <0>;

cpu@0 {
device_type = "cpu";
compatible = "arm,cortex-a15";
reg = <0>;
};
};

memory {
device_type = "memory";
reg = <0x80000000 0x80000000>;
};

gic: interrupt-controller@2c001000 {
compatible = "arm,cortex-a9-gic";
#interrupt-cells = <3>;
#address-cells = <0>;
interrupt-controller;
reg = <0x2c001000 0x1000>,
<0x2c002000 0x100>;
};

pmu {
compatible = "arm,cortex-a9-pmu";
interrupts = <0 68 4>,
<0 69 4>;
};

xen {
compatible = "arm,xen";
reg = <0xb0000000 0x20000>;
interrupts = <1 15 0xf08>;
};

motherboard {
ranges = <0 0 0x08000000 0x04000000>,
<1 0 0x14000000 0x04000000>,
<2 0 0x18000000 0x04000000>,
<3 0 0x1c000000 0x04000000>,
<4 0 0x0c000000 0x04000000>,
<5 0 0x10000000 0x04000000>;

interrupt-map-mask = <0 0 63>;
interrupt-map = <0 0 0 &gic 0 0 4>,
<0 0 1 &gic 0 1 4>,
<0 0 2 &gic 0 2 4>,
<0 0 3 &gic 0 3 4>,
<0 0 4 &gic 0 4 4>,
<0 0 5 &gic 0 5 4>,
<0 0 6 &gic 0 6 4>,
<0 0 7 &gic 0 7 4>,
<0 0 8 &gic 0 8 4>,
<0 0 9 &gic 0 9 4>,
<0 0 10 &gic 0 10 4>,
<0 0 11 &gic 0 11 4>,
<0 0 12 &gic 0 12 4>,
<0 0 13 &gic 0 13 4>,
<0 0 14 &gic 0 14 4>,
<0 0 15 &gic 0 15 4>,
<0 0 16 &gic 0 16 4>,
<0 0 17 &gic 0 17 4>,
<0 0 18 &gic 0 18 4>,
<0 0 19 &gic 0 19 4>,
<0 0 20 &gic 0 20 4>,
<0 0 21 &gic 0 21 4>,
<0 0 22 &gic 0 22 4>,
<0 0 23 &gic 0 23 4>,
<0 0 24 &gic 0 24 4>,
<0 0 25 &gic 0 25 4>,
<0 0 26 &gic 0 26 4>,
<0 0 27 &gic 0 27 4>,
<0 0 28 &gic 0 28 4>,
<0 0 29 &gic 0 29 4>,
<0 0 30 &gic 0 30 4>,
<0 0 31 &gic 0 31 4>,
<0 0 32 &gic 0 32 4>,
<0 0 33 &gic 0 33 4>,
<0 0 34 &gic 0 34 4>,
<0 0 35 &gic 0 35 4>,
<0 0 36 &gic 0 36 4>,
<0 0 37 &gic 0 37 4>,
<0 0 38 &gic 0 38 4>,
<0 0 39 &gic 0 39 4>,
<0 0 40 &gic 0 40 4>,
<0 0 41 &gic 0 41 4>,
<0 0 42 &gic 0 42 4>;
};
};

/include/ "vexpress-v2m-rs1-rtsm.dtsi"

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/*
* ARM Ltd. Versatile Express
*
* Motherboard Express uATX
* V2M-P1
*
* HBI-0190D
*
* RS1 memory map ("ARM Cortex-A Series memory map" in the board's
* Technical Reference Manual)
*
* WARNING! The hardware described in this file is independent from the
* original variant (vexpress-v2m.dtsi), but there is a strong
* correspondence between the two configurations.
*
* TAKE CARE WHEN MAINTAINING THIS FILE TO PROPAGATE ANY RELEVANT
* CHANGES TO vexpress-v2m.dtsi!
*/

/ {
aliases {
arm,v2m_timer = &v2m_timer01;
};

motherboard {
compatible = "simple-bus";
arm,v2m-memory-map = "rs1";
#address-cells = <2>; /* SMB chipselect number and offset */
#size-cells = <1>;
#interrupt-cells = <1>;

flash@0,00000000 {
compatible = "arm,vexpress-flash", "cfi-flash";
reg = <0 0x00000000 0x04000000>,
<4 0x00000000 0x04000000>;
bank-width = <4>;
};

psram@1,00000000 {
compatible = "arm,vexpress-psram", "mtd-ram";
reg = <1 0x00000000 0x02000000>;
bank-width = <4>;
};

vram@2,00000000 {
compatible = "arm,vexpress-vram";
reg = <2 0x00000000 0x00800000>;
};

ethernet@2,02000000 {
compatible = "smsc,lan91c111";
reg = <2 0x02000000 0x10000>;
interrupts = <15>;
};

usb@2,03000000 {
compatible = "nxp,usb-isp1761";
reg = <2 0x03000000 0x20000>;
interrupts = <16>;
port1-otg;
};

iofpga@3,00000000 {
compatible = "arm,amba-bus", "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 3 0 0x200000>;

sysreg@010000 {
compatible = "arm,vexpress-sysreg";
reg = <0x010000 0x1000>;
};

sysctl@020000 {
compatible = "arm,sp810", "arm,primecell";
reg = <0x020000 0x1000>;
};

/* PCI-E I2C bus */
v2m_i2c_pcie: i2c@030000 {
compatible = "arm,versatile-i2c";
reg = <0x030000 0x1000>;

#address-cells = <1>;
#size-cells = <0>;

pcie-switch@60 {
compatible = "idt,89hpes32h8";
reg = <0x60>;
};
};

aaci@040000 {
compatible = "arm,pl041", "arm,primecell";
reg = <0x040000 0x1000>;
interrupts = <11>;
};

mmci@050000 {
compatible = "arm,pl180", "arm,primecell";
reg = <0x050000 0x1000>;
interrupts = <9 10>;
};

kmi@060000 {
compatible = "arm,pl050", "arm,primecell";
reg = <0x060000 0x1000>;
interrupts = <12>;
};

kmi@070000 {
compatible = "arm,pl050", "arm,primecell";
reg = <0x070000 0x1000>;
interrupts = <13>;
};

v2m_serial0: uart@090000 {
compatible = "arm,pl011", "arm,primecell";
reg = <0x090000 0x1000>;
interrupts = <5>;
};

v2m_serial1: uart@0a0000 {
compatible = "arm,pl011", "arm,primecell";
reg = <0x0a0000 0x1000>;
interrupts = <6>;
};

v2m_serial2: uart@0b0000 {
compatible = "arm,pl011", "arm,primecell";
reg = <0x0b0000 0x1000>;
interrupts = <7>;
};

v2m_serial3: uart@0c0000 {
compatible = "arm,pl011", "arm,primecell";
reg = <0x0c0000 0x1000>;
interrupts = <8>;
};

wdt@0f0000 {
compatible = "arm,sp805", "arm,primecell";
reg = <0x0f0000 0x1000>;
interrupts = <0>;
};

v2m_timer01: timer@110000 {
compatible = "arm,sp804", "arm,primecell";
reg = <0x110000 0x1000>;
interrupts = <2>;
};

v2m_timer23: timer@120000 {
compatible = "arm,sp804", "arm,primecell";
reg = <0x120000 0x1000>;
};

/* DVI I2C bus */
v2m_i2c_dvi: i2c@160000 {
compatible = "arm,versatile-i2c";
reg = <0x160000 0x1000>;

#address-cells = <1>;
#size-cells = <0>;

dvi-transmitter@39 {
compatible = "sil,sii9022-tpi", "sil,sii9022";
reg = <0x39>;
};

dvi-transmitter@60 {
compatible = "sil,sii9022-cpi", "sil,sii9022";
reg = <0x60>;
};
};

rtc@170000 {
compatible = "arm,pl031", "arm,primecell";
reg = <0x170000 0x1000>;
interrupts = <4>;
};

compact-flash@1a0000 {
compatible = "arm,vexpress-cf", "ata-generic";
reg = <0x1a0000 0x100
0x1a0100 0xf00>;
reg-shift = <2>;
};

clcd@1f0000 {
compatible = "arm,pl111", "arm,primecell";
reg = <0x1f0000 0x1000>;
interrupts = <14>;
};
};
};
};