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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-09-26 16:42:14 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-09-26 16:43:35 -0400
commitae1659ee6b4bf5e12a141d04636a3de89543c237 (patch)
tree67ca3da7e9461832f9e2cb23fc89b5c7c92ff10d /arch/arm
parentc341ca45ce56143804ef5a8f4db753e554e640b4 (diff)
parentbbd6eb29214e1a278e8575f57d64b88077bebf6d (diff)
Merge branch 'xenarm-for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm into stable/for-linus-3.7
* 'xenarm-for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm: arm: introduce a DTS for Xen unprivileged virtual machines MAINTAINERS: add myself as Xen ARM maintainer xen/arm: compile netback xen/arm: compile blkfront and blkback xen/arm: implement alloc/free_xenballooned_pages with alloc_pages/kfree xen/arm: receive Xen events on ARM xen/arm: initialize grant_table on ARM xen/arm: get privilege status xen/arm: introduce CONFIG_XEN on ARM xen: do not compile manage, balloon, pci, acpi, pcpu and cpu_hotplug on ARM xen/arm: Introduce xen_ulong_t for unsigned long xen/arm: Xen detection and shared_info page mapping docs: Xen ARM DT bindings xen/arm: empty implementation of grant_table arch specific functions xen/arm: sync_bitops xen/arm: page.h definitions xen/arm: hypercalls arm: initial Xen support Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/Kconfig10
-rw-r--r--arch/arm/Makefile1
-rw-r--r--arch/arm/boot/dts/xenvm-4.2.dts68
-rw-r--r--arch/arm/include/asm/hypervisor.h6
-rw-r--r--arch/arm/include/asm/sync_bitops.h27
-rw-r--r--arch/arm/include/asm/xen/events.h18
-rw-r--r--arch/arm/include/asm/xen/hypercall.h69
-rw-r--r--arch/arm/include/asm/xen/hypervisor.h19
-rw-r--r--arch/arm/include/asm/xen/interface.h73
-rw-r--r--arch/arm/include/asm/xen/page.h82
-rw-r--r--arch/arm/mach-vexpress/Makefile.boot3
-rw-r--r--arch/arm/mach-vexpress/v2m.c1
-rw-r--r--arch/arm/xen/Makefile1
-rw-r--r--arch/arm/xen/enlighten.c168
-rw-r--r--arch/arm/xen/grant-table.c53
-rw-r--r--arch/arm/xen/hypercall.S106
16 files changed, 704 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2f88d8d97701..33614669a9a0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1897,6 +1897,16 @@ config DEPRECATED_PARAM_STRUCT
1897 This was deprecated in 2001 and announced to live on for 5 years. 1897 This was deprecated in 2001 and announced to live on for 5 years.
1898 Some old boot loaders still use this way. 1898 Some old boot loaders still use this way.
1899 1899
1900config XEN_DOM0
1901 def_bool y
1902 depends on XEN
1903
1904config XEN
1905 bool "Xen guest support on ARM (EXPERIMENTAL)"
1906 depends on EXPERIMENTAL && ARM && OF
1907 help
1908 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1909
1900endmenu 1910endmenu
1901 1911
1902menu "Boot options" 1912menu "Boot options"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 30eae87ead6d..f42968a9fca3 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -251,6 +251,7 @@ endif
251core-$(CONFIG_FPE_NWFPE) += arch/arm/nwfpe/ 251core-$(CONFIG_FPE_NWFPE) += arch/arm/nwfpe/
252core-$(CONFIG_FPE_FASTFPE) += $(FASTFPE_OBJ) 252core-$(CONFIG_FPE_FASTFPE) += $(FASTFPE_OBJ)
253core-$(CONFIG_VFP) += arch/arm/vfp/ 253core-$(CONFIG_VFP) += arch/arm/vfp/
254core-$(CONFIG_XEN) += arch/arm/xen/
254 255
255# If we have a machine-specific directory, then include it in the build. 256# If we have a machine-specific directory, then include it in the build.
256core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/ 257core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/
diff --git a/arch/arm/boot/dts/xenvm-4.2.dts b/arch/arm/boot/dts/xenvm-4.2.dts
new file mode 100644
index 000000000000..ec3f9528e180
--- /dev/null
+++ b/arch/arm/boot/dts/xenvm-4.2.dts
@@ -0,0 +1,68 @@
1/*
2 * Xen Virtual Machine for unprivileged guests
3 *
4 * Based on ARM Ltd. Versatile Express CoreTile Express (single CPU)
5 * Cortex-A15 MPCore (V2P-CA15)
6 *
7 */
8
9/dts-v1/;
10
11/ {
12 model = "XENVM-4.2";
13 compatible = "xen,xenvm-4.2", "xen,xenvm";
14 interrupt-parent = <&gic>;
15 #address-cells = <2>;
16 #size-cells = <2>;
17
18 chosen {
19 /* this field is going to be adjusted by the hypervisor */
20 bootargs = "console=hvc0 root=/dev/xvda";
21 };
22
23 cpus {
24 #address-cells = <1>;
25 #size-cells = <0>;
26
27 cpu@0 {
28 device_type = "cpu";
29 compatible = "arm,cortex-a15";
30 reg = <0>;
31 };
32 };
33
34 memory@80000000 {
35 device_type = "memory";
36 /* this field is going to be adjusted by the hypervisor */
37 reg = <0 0x80000000 0 0x08000000>;
38 };
39
40 gic: interrupt-controller@2c001000 {
41 compatible = "arm,cortex-a15-gic", "arm,cortex-a9-gic";
42 #interrupt-cells = <3>;
43 #address-cells = <0>;
44 interrupt-controller;
45 reg = <0 0x2c001000 0 0x1000>,
46 <0 0x2c002000 0 0x100>;
47 };
48
49 timer {
50 compatible = "arm,armv7-timer";
51 interrupts = <1 13 0xf08>,
52 <1 14 0xf08>,
53 <1 11 0xf08>,
54 <1 10 0xf08>;
55 };
56
57 hypervisor {
58 compatible = "xen,xen-4.2", "xen,xen";
59 /* this field is going to be adjusted by the hypervisor */
60 reg = <0 0xb0000000 0 0x20000>;
61 /* this field is going to be adjusted by the hypervisor */
62 interrupts = <1 15 0xf08>;
63 };
64
65 motherboard {
66 arm,v2m-memory-map = "rs1";
67 };
68};
diff --git a/arch/arm/include/asm/hypervisor.h b/arch/arm/include/asm/hypervisor.h
new file mode 100644
index 000000000000..b90d9e523d6f
--- /dev/null
+++ b/arch/arm/include/asm/hypervisor.h
@@ -0,0 +1,6 @@
1#ifndef _ASM_ARM_HYPERVISOR_H
2#define _ASM_ARM_HYPERVISOR_H
3
4#include <asm/xen/hypervisor.h>
5
6#endif
diff --git a/arch/arm/include/asm/sync_bitops.h b/arch/arm/include/asm/sync_bitops.h
new file mode 100644
index 000000000000..63479eecbf76
--- /dev/null
+++ b/arch/arm/include/asm/sync_bitops.h
@@ -0,0 +1,27 @@
1#ifndef __ASM_SYNC_BITOPS_H__
2#define __ASM_SYNC_BITOPS_H__
3
4#include <asm/bitops.h>
5#include <asm/system.h>
6
7/* sync_bitops functions are equivalent to the SMP implementation of the
8 * original functions, independently from CONFIG_SMP being defined.
9 *
10 * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
11 * under Xen you might be communicating with a completely external entity
12 * who might be on another CPU (e.g. two uniprocessor guests communicating
13 * via event channels and grant tables). So we need a variant of the bit
14 * ops which are SMP safe even on a UP kernel.
15 */
16
17#define sync_set_bit(nr, p) _set_bit(nr, p)
18#define sync_clear_bit(nr, p) _clear_bit(nr, p)
19#define sync_change_bit(nr, p) _change_bit(nr, p)
20#define sync_test_and_set_bit(nr, p) _test_and_set_bit(nr, p)
21#define sync_test_and_clear_bit(nr, p) _test_and_clear_bit(nr, p)
22#define sync_test_and_change_bit(nr, p) _test_and_change_bit(nr, p)
23#define sync_test_bit(nr, addr) test_bit(nr, addr)
24#define sync_cmpxchg cmpxchg
25
26
27#endif
diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
new file mode 100644
index 000000000000..94b4e9020b02
--- /dev/null
+++ b/arch/arm/include/asm/xen/events.h
@@ -0,0 +1,18 @@
1#ifndef _ASM_ARM_XEN_EVENTS_H
2#define _ASM_ARM_XEN_EVENTS_H
3
4#include <asm/ptrace.h>
5
6enum ipi_vector {
7 XEN_PLACEHOLDER_VECTOR,
8
9 /* Xen IPIs go here */
10 XEN_NR_IPIS,
11};
12
13static inline int xen_irqs_disabled(struct pt_regs *regs)
14{
15 return raw_irqs_disabled_flags(regs->ARM_cpsr);
16}
17
18#endif /* _ASM_ARM_XEN_EVENTS_H */
diff --git a/arch/arm/include/asm/xen/hypercall.h b/arch/arm/include/asm/xen/hypercall.h
new file mode 100644
index 000000000000..8a823253d775
--- /dev/null
+++ b/arch/arm/include/asm/xen/hypercall.h
@@ -0,0 +1,69 @@
1/******************************************************************************
2 * hypercall.h
3 *
4 * Linux-specific hypervisor handling.
5 *
6 * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation; or, when distributed
11 * separately from the Linux kernel or incorporated into other
12 * software packages, subject to the following license:
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this source file (the "Software"), to deal in the Software without
16 * restriction, including without limitation the rights to use, copy, modify,
17 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18 * and to permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30 * IN THE SOFTWARE.
31 */
32
33#ifndef _ASM_ARM_XEN_HYPERCALL_H
34#define _ASM_ARM_XEN_HYPERCALL_H
35
36#include <xen/interface/xen.h>
37
38long privcmd_call(unsigned call, unsigned long a1,
39 unsigned long a2, unsigned long a3,
40 unsigned long a4, unsigned long a5);
41int HYPERVISOR_xen_version(int cmd, void *arg);
42int HYPERVISOR_console_io(int cmd, int count, char *str);
43int HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count);
44int HYPERVISOR_sched_op(int cmd, void *arg);
45int HYPERVISOR_event_channel_op(int cmd, void *arg);
46unsigned long HYPERVISOR_hvm_op(int op, void *arg);
47int HYPERVISOR_memory_op(unsigned int cmd, void *arg);
48int HYPERVISOR_physdev_op(int cmd, void *arg);
49
50static inline void
51MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
52 unsigned int new_val, unsigned long flags)
53{
54 BUG();
55}
56
57static inline void
58MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
59 int count, int *success_count, domid_t domid)
60{
61 BUG();
62}
63
64static inline int
65HYPERVISOR_multicall(void *call_list, int nr_calls)
66{
67 BUG();
68}
69#endif /* _ASM_ARM_XEN_HYPERCALL_H */
diff --git a/arch/arm/include/asm/xen/hypervisor.h b/arch/arm/include/asm/xen/hypervisor.h
new file mode 100644
index 000000000000..d7ab99a0c9eb
--- /dev/null
+++ b/arch/arm/include/asm/xen/hypervisor.h
@@ -0,0 +1,19 @@
1#ifndef _ASM_ARM_XEN_HYPERVISOR_H
2#define _ASM_ARM_XEN_HYPERVISOR_H
3
4extern struct shared_info *HYPERVISOR_shared_info;
5extern struct start_info *xen_start_info;
6
7/* Lazy mode for batching updates / context switch */
8enum paravirt_lazy_mode {
9 PARAVIRT_LAZY_NONE,
10 PARAVIRT_LAZY_MMU,
11 PARAVIRT_LAZY_CPU,
12};
13
14static inline enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
15{
16 return PARAVIRT_LAZY_NONE;
17}
18
19#endif /* _ASM_ARM_XEN_HYPERVISOR_H */
diff --git a/arch/arm/include/asm/xen/interface.h b/arch/arm/include/asm/xen/interface.h
new file mode 100644
index 000000000000..ae05e56dd17d
--- /dev/null
+++ b/arch/arm/include/asm/xen/interface.h
@@ -0,0 +1,73 @@
1/******************************************************************************
2 * Guest OS interface to ARM Xen.
3 *
4 * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
5 */
6
7#ifndef _ASM_ARM_XEN_INTERFACE_H
8#define _ASM_ARM_XEN_INTERFACE_H
9
10#include <linux/types.h>
11
12#define uint64_aligned_t uint64_t __attribute__((aligned(8)))
13
14#define __DEFINE_GUEST_HANDLE(name, type) \
15 typedef struct { union { type *p; uint64_aligned_t q; }; } \
16 __guest_handle_ ## name
17
18#define DEFINE_GUEST_HANDLE_STRUCT(name) \
19 __DEFINE_GUEST_HANDLE(name, struct name)
20#define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name)
21#define GUEST_HANDLE(name) __guest_handle_ ## name
22
23#define set_xen_guest_handle(hnd, val) \
24 do { \
25 if (sizeof(hnd) == 8) \
26 *(uint64_t *)&(hnd) = 0; \
27 (hnd).p = val; \
28 } while (0)
29
30#ifndef __ASSEMBLY__
31/* Explicitly size integers that represent pfns in the interface with
32 * Xen so that we can have one ABI that works for 32 and 64 bit guests. */
33typedef uint64_t xen_pfn_t;
34typedef uint64_t xen_ulong_t;
35/* Guest handles for primitive C types. */
36__DEFINE_GUEST_HANDLE(uchar, unsigned char);
37__DEFINE_GUEST_HANDLE(uint, unsigned int);
38__DEFINE_GUEST_HANDLE(ulong, unsigned long);
39DEFINE_GUEST_HANDLE(char);
40DEFINE_GUEST_HANDLE(int);
41DEFINE_GUEST_HANDLE(long);
42DEFINE_GUEST_HANDLE(void);
43DEFINE_GUEST_HANDLE(uint64_t);
44DEFINE_GUEST_HANDLE(uint32_t);
45DEFINE_GUEST_HANDLE(xen_pfn_t);
46
47/* Maximum number of virtual CPUs in multi-processor guests. */
48#define MAX_VIRT_CPUS 1
49
50struct arch_vcpu_info { };
51struct arch_shared_info { };
52
53/* TODO: Move pvclock definitions some place arch independent */
54struct pvclock_vcpu_time_info {
55 u32 version;
56 u32 pad0;
57 u64 tsc_timestamp;
58 u64 system_time;
59 u32 tsc_to_system_mul;
60 s8 tsc_shift;
61 u8 flags;
62 u8 pad[2];
63} __attribute__((__packed__)); /* 32 bytes */
64
65/* It is OK to have a 12 bytes struct with no padding because it is packed */
66struct pvclock_wall_clock {
67 u32 version;
68 u32 sec;
69 u32 nsec;
70} __attribute__((__packed__));
71#endif
72
73#endif /* _ASM_ARM_XEN_INTERFACE_H */
diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
new file mode 100644
index 000000000000..174202318dff
--- /dev/null
+++ b/arch/arm/include/asm/xen/page.h
@@ -0,0 +1,82 @@
1#ifndef _ASM_ARM_XEN_PAGE_H
2#define _ASM_ARM_XEN_PAGE_H
3
4#include <asm/page.h>
5#include <asm/pgtable.h>
6
7#include <linux/pfn.h>
8#include <linux/types.h>
9
10#include <xen/interface/grant_table.h>
11
12#define pfn_to_mfn(pfn) (pfn)
13#define phys_to_machine_mapping_valid (1)
14#define mfn_to_pfn(mfn) (mfn)
15#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
16
17#define pte_mfn pte_pfn
18#define mfn_pte pfn_pte
19
20/* Xen machine address */
21typedef struct xmaddr {
22 phys_addr_t maddr;
23} xmaddr_t;
24
25/* Xen pseudo-physical address */
26typedef struct xpaddr {
27 phys_addr_t paddr;
28} xpaddr_t;
29
30#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
31#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
32
33static inline xmaddr_t phys_to_machine(xpaddr_t phys)
34{
35 unsigned offset = phys.paddr & ~PAGE_MASK;
36 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
37}
38
39static inline xpaddr_t machine_to_phys(xmaddr_t machine)
40{
41 unsigned offset = machine.maddr & ~PAGE_MASK;
42 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
43}
44/* VIRT <-> MACHINE conversion */
45#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
46#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
47#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
48#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
49
50static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
51{
52 /* TODO: assuming it is mapped in the kernel 1:1 */
53 return virt_to_machine(vaddr);
54}
55
56/* TODO: this shouldn't be here but it is because the frontend drivers
57 * are using it (its rolled in headers) even though we won't hit the code path.
58 * So for right now just punt with this.
59 */
60static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
61{
62 BUG();
63 return NULL;
64}
65
66static inline int m2p_add_override(unsigned long mfn, struct page *page,
67 struct gnttab_map_grant_ref *kmap_op)
68{
69 return 0;
70}
71
72static inline int m2p_remove_override(struct page *page, bool clear_pte)
73{
74 return 0;
75}
76
77static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
78{
79 BUG();
80 return false;
81}
82#endif /* _ASM_ARM_XEN_PAGE_H */
diff --git a/arch/arm/mach-vexpress/Makefile.boot b/arch/arm/mach-vexpress/Makefile.boot
index 318d308dfb93..38dbaac63349 100644
--- a/arch/arm/mach-vexpress/Makefile.boot
+++ b/arch/arm/mach-vexpress/Makefile.boot
@@ -7,4 +7,5 @@ initrd_phys-y := 0x60800000
7dtb-$(CONFIG_ARCH_VEXPRESS_DT) += vexpress-v2p-ca5s.dtb \ 7dtb-$(CONFIG_ARCH_VEXPRESS_DT) += vexpress-v2p-ca5s.dtb \
8 vexpress-v2p-ca9.dtb \ 8 vexpress-v2p-ca9.dtb \
9 vexpress-v2p-ca15-tc1.dtb \ 9 vexpress-v2p-ca15-tc1.dtb \
10 vexpress-v2p-ca15_a7.dtb 10 vexpress-v2p-ca15_a7.dtb \
11 xenvm-4.2.dtb
diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
index 37608f22ee31..0a79b085ceaf 100644
--- a/arch/arm/mach-vexpress/v2m.c
+++ b/arch/arm/mach-vexpress/v2m.c
@@ -658,6 +658,7 @@ static void __init v2m_dt_init(void)
658 658
659const static char *v2m_dt_match[] __initconst = { 659const static char *v2m_dt_match[] __initconst = {
660 "arm,vexpress", 660 "arm,vexpress",
661 "xen,xenvm",
661 NULL, 662 NULL,
662}; 663};
663 664
diff --git a/arch/arm/xen/Makefile b/arch/arm/xen/Makefile
new file mode 100644
index 000000000000..43841033afd3
--- /dev/null
+++ b/arch/arm/xen/Makefile
@@ -0,0 +1 @@
obj-y := enlighten.o hypercall.o grant-table.o
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
new file mode 100644
index 000000000000..59bcb96ac369
--- /dev/null
+++ b/arch/arm/xen/enlighten.c
@@ -0,0 +1,168 @@
1#include <xen/xen.h>
2#include <xen/events.h>
3#include <xen/grant_table.h>
4#include <xen/hvm.h>
5#include <xen/interface/xen.h>
6#include <xen/interface/memory.h>
7#include <xen/interface/hvm/params.h>
8#include <xen/features.h>
9#include <xen/platform_pci.h>
10#include <xen/xenbus.h>
11#include <asm/xen/hypervisor.h>
12#include <asm/xen/hypercall.h>
13#include <linux/interrupt.h>
14#include <linux/irqreturn.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/of_irq.h>
18#include <linux/of_address.h>
19
20struct start_info _xen_start_info;
21struct start_info *xen_start_info = &_xen_start_info;
22EXPORT_SYMBOL_GPL(xen_start_info);
23
24enum xen_domain_type xen_domain_type = XEN_NATIVE;
25EXPORT_SYMBOL_GPL(xen_domain_type);
26
27struct shared_info xen_dummy_shared_info;
28struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
29
30DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
31
32/* TODO: to be removed */
33__read_mostly int xen_have_vector_callback;
34EXPORT_SYMBOL_GPL(xen_have_vector_callback);
35
36int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
37EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
38
39static __read_mostly int xen_events_irq = -1;
40
41int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
42 unsigned long addr,
43 unsigned long mfn, int nr,
44 pgprot_t prot, unsigned domid)
45{
46 return -ENOSYS;
47}
48EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
49
50/*
51 * see Documentation/devicetree/bindings/arm/xen.txt for the
52 * documentation of the Xen Device Tree format.
53 */
54#define GRANT_TABLE_PHYSADDR 0
55static int __init xen_guest_init(void)
56{
57 struct xen_add_to_physmap xatp;
58 static struct shared_info *shared_info_page = 0;
59 struct device_node *node;
60 int len;
61 const char *s = NULL;
62 const char *version = NULL;
63 const char *xen_prefix = "xen,xen-";
64 struct resource res;
65
66 node = of_find_compatible_node(NULL, NULL, "xen,xen");
67 if (!node) {
68 pr_debug("No Xen support\n");
69 return 0;
70 }
71 s = of_get_property(node, "compatible", &len);
72 if (strlen(xen_prefix) + 3 < len &&
73 !strncmp(xen_prefix, s, strlen(xen_prefix)))
74 version = s + strlen(xen_prefix);
75 if (version == NULL) {
76 pr_debug("Xen version not found\n");
77 return 0;
78 }
79 if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
80 return 0;
81 xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
82 xen_events_irq = irq_of_parse_and_map(node, 0);
83 pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
84 version, xen_events_irq, xen_hvm_resume_frames);
85 xen_domain_type = XEN_HVM_DOMAIN;
86
87 xen_setup_features();
88 if (xen_feature(XENFEAT_dom0))
89 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
90 else
91 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
92
93 if (!shared_info_page)
94 shared_info_page = (struct shared_info *)
95 get_zeroed_page(GFP_KERNEL);
96 if (!shared_info_page) {
97 pr_err("not enough memory\n");
98 return -ENOMEM;
99 }
100 xatp.domid = DOMID_SELF;
101 xatp.idx = 0;
102 xatp.space = XENMAPSPACE_shared_info;
103 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
104 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
105 BUG();
106
107 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
108
109 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
110 * page, we use it in the event channel upcall and in some pvclock
111 * related functions. We don't need the vcpu_info placement
112 * optimizations because we don't use any pv_mmu or pv_irq op on
113 * HVM.
114 * The shared info contains exactly 1 CPU (the boot CPU). The guest
115 * is required to use VCPUOP_register_vcpu_info to place vcpu info
116 * for secondary CPUs as they are brought up. */
117 per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
118
119 gnttab_init();
120 if (!xen_initial_domain())
121 xenbus_probe(NULL);
122
123 return 0;
124}
125core_initcall(xen_guest_init);
126
127static irqreturn_t xen_arm_callback(int irq, void *arg)
128{
129 xen_hvm_evtchn_do_upcall();
130 return IRQ_HANDLED;
131}
132
133static int __init xen_init_events(void)
134{
135 if (!xen_domain() || xen_events_irq < 0)
136 return -ENODEV;
137
138 xen_init_IRQ();
139
140 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
141 "events", xen_vcpu)) {
142 pr_err("Error requesting IRQ %d\n", xen_events_irq);
143 return -EINVAL;
144 }
145
146 enable_percpu_irq(xen_events_irq, 0);
147
148 return 0;
149}
150postcore_initcall(xen_init_events);
151
152/* XXX: only until balloon is properly working */
153int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
154{
155 *pages = alloc_pages(highmem ? GFP_HIGHUSER : GFP_KERNEL,
156 get_order(nr_pages));
157 if (*pages == NULL)
158 return -ENOMEM;
159 return 0;
160}
161EXPORT_SYMBOL_GPL(alloc_xenballooned_pages);
162
163void free_xenballooned_pages(int nr_pages, struct page **pages)
164{
165 kfree(*pages);
166 *pages = NULL;
167}
168EXPORT_SYMBOL_GPL(free_xenballooned_pages);
diff --git a/arch/arm/xen/grant-table.c b/arch/arm/xen/grant-table.c
new file mode 100644
index 000000000000..dbd1330c0196
--- /dev/null
+++ b/arch/arm/xen/grant-table.c
@@ -0,0 +1,53 @@
1/******************************************************************************
2 * grant_table.c
3 * ARM specific part
4 *
5 * Granting foreign access to our memory reservation.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version 2
9 * as published by the Free Software Foundation; or, when distributed
10 * separately from the Linux kernel or incorporated into other
11 * software packages, subject to the following license:
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a copy
14 * of this source file (the "Software"), to deal in the Software without
15 * restriction, including without limitation the rights to use, copy, modify,
16 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
17 * and to permit persons to whom the Software is furnished to do so, subject to
18 * the following conditions:
19 *
20 * The above copyright notice and this permission notice shall be included in
21 * all copies or substantial portions of the Software.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
26 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
29 * IN THE SOFTWARE.
30 */
31
32#include <xen/interface/xen.h>
33#include <xen/page.h>
34#include <xen/grant_table.h>
35
36int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
37 unsigned long max_nr_gframes,
38 void **__shared)
39{
40 return -ENOSYS;
41}
42
43void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
44{
45 return;
46}
47
48int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
49 unsigned long max_nr_gframes,
50 grant_status_t **__shared)
51{
52 return -ENOSYS;
53}
diff --git a/arch/arm/xen/hypercall.S b/arch/arm/xen/hypercall.S
new file mode 100644
index 000000000000..074f5ed101b9
--- /dev/null
+++ b/arch/arm/xen/hypercall.S
@@ -0,0 +1,106 @@
1/******************************************************************************
2 * hypercall.S
3 *
4 * Xen hypercall wrappers
5 *
6 * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation; or, when distributed
11 * separately from the Linux kernel or incorporated into other
12 * software packages, subject to the following license:
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this source file (the "Software"), to deal in the Software without
16 * restriction, including without limitation the rights to use, copy, modify,
17 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18 * and to permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30 * IN THE SOFTWARE.
31 */
32
33/*
34 * The Xen hypercall calling convention is very similar to the ARM
35 * procedure calling convention: the first paramter is passed in r0, the
36 * second in r1, the third in r2 and the fourth in r3. Considering that
37 * Xen hypercalls have 5 arguments at most, the fifth paramter is passed
38 * in r4, differently from the procedure calling convention of using the
39 * stack for that case.
40 *
41 * The hypercall number is passed in r12.
42 *
43 * The return value is in r0.
44 *
45 * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM
46 * hypercall tag.
47 */
48
49#include <linux/linkage.h>
50#include <asm/assembler.h>
51#include <xen/interface/xen.h>
52
53
54/* HVC 0xEA1 */
55#ifdef CONFIG_THUMB2_KERNEL
56#define xen_hvc .word 0xf7e08ea1
57#else
58#define xen_hvc .word 0xe140ea71
59#endif
60
61#define HYPERCALL_SIMPLE(hypercall) \
62ENTRY(HYPERVISOR_##hypercall) \
63 mov r12, #__HYPERVISOR_##hypercall; \
64 xen_hvc; \
65 mov pc, lr; \
66ENDPROC(HYPERVISOR_##hypercall)
67
68#define HYPERCALL0 HYPERCALL_SIMPLE
69#define HYPERCALL1 HYPERCALL_SIMPLE
70#define HYPERCALL2 HYPERCALL_SIMPLE
71#define HYPERCALL3 HYPERCALL_SIMPLE
72#define HYPERCALL4 HYPERCALL_SIMPLE
73
74#define HYPERCALL5(hypercall) \
75ENTRY(HYPERVISOR_##hypercall) \
76 stmdb sp!, {r4} \
77 ldr r4, [sp, #4] \
78 mov r12, #__HYPERVISOR_##hypercall; \
79 xen_hvc \
80 ldm sp!, {r4} \
81 mov pc, lr \
82ENDPROC(HYPERVISOR_##hypercall)
83
84 .text
85
86HYPERCALL2(xen_version);
87HYPERCALL3(console_io);
88HYPERCALL3(grant_table_op);
89HYPERCALL2(sched_op);
90HYPERCALL2(event_channel_op);
91HYPERCALL2(hvm_op);
92HYPERCALL2(memory_op);
93HYPERCALL2(physdev_op);
94
95ENTRY(privcmd_call)
96 stmdb sp!, {r4}
97 mov r12, r0
98 mov r0, r1
99 mov r1, r2
100 mov r2, r3
101 ldr r3, [sp, #8]
102 ldr r4, [sp, #4]
103 xen_hvc
104 ldm sp!, {r4}
105 mov pc, lr
106ENDPROC(privcmd_call);