diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/Kconfig | 10 | ||||
| -rw-r--r-- | arch/arm/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/boot/dts/Makefile | 3 | ||||
| -rw-r--r-- | arch/arm/boot/dts/xenvm-4.2.dts | 68 | ||||
| -rw-r--r-- | arch/arm/include/asm/hypervisor.h | 6 | ||||
| -rw-r--r-- | arch/arm/include/asm/sync_bitops.h | 27 | ||||
| -rw-r--r-- | arch/arm/include/asm/xen/events.h | 18 | ||||
| -rw-r--r-- | arch/arm/include/asm/xen/hypercall.h | 69 | ||||
| -rw-r--r-- | arch/arm/include/asm/xen/hypervisor.h | 19 | ||||
| -rw-r--r-- | arch/arm/include/asm/xen/interface.h | 73 | ||||
| -rw-r--r-- | arch/arm/include/asm/xen/page.h | 82 | ||||
| -rw-r--r-- | arch/arm/mach-vexpress/v2m.c | 1 | ||||
| -rw-r--r-- | arch/arm/xen/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/xen/enlighten.c | 168 | ||||
| -rw-r--r-- | arch/arm/xen/grant-table.c | 53 | ||||
| -rw-r--r-- | arch/arm/xen/hypercall.S | 106 |
16 files changed, 704 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 7bab17e..3975d10 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1829,6 +1829,16 @@ config DEPRECATED_PARAM_STRUCT This was deprecated in 2001 and announced to live on for 5 years. Some old boot loaders still use this way. +config XEN_DOM0 + def_bool y + depends on XEN + +config XEN + bool "Xen guest support on ARM (EXPERIMENTAL)" + depends on EXPERIMENTAL && ARM && OF + help + Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. + endmenu menu "Boot options" diff --git a/arch/arm/Makefile b/arch/arm/Makefile index b86e57e..40ea991 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -250,6 +250,7 @@ endif core-$(CONFIG_FPE_NWFPE) += arch/arm/nwfpe/ core-$(CONFIG_FPE_FASTFPE) += $(FASTFPE_OBJ) core-$(CONFIG_VFP) += arch/arm/vfp/ +core-$(CONFIG_XEN) += arch/arm/xen/ # If we have a machine-specific directory, then include it in the build. core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/ diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile index 43c084c..4745c1f 100644 --- a/arch/arm/boot/dts/Makefile +++ b/arch/arm/boot/dts/Makefile @@ -96,6 +96,7 @@ dtb-$(CONFIG_ARCH_TEGRA) += tegra20-harmony.dtb \ dtb-$(CONFIG_ARCH_VEXPRESS) += vexpress-v2p-ca5s.dtb \ vexpress-v2p-ca9.dtb \ vexpress-v2p-ca15-tc1.dtb \ - vexpress-v2p-ca15_a7.dtb + vexpress-v2p-ca15_a7.dtb \ + xenvm-4.2.dtb endif 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 0000000..ec3f952 --- /dev/null +++ b/arch/arm/boot/dts/xenvm-4.2.dts @@ -0,0 +1,68 @@ +/* + * Xen Virtual Machine for unprivileged guests + * + * Based on ARM Ltd. Versatile Express CoreTile Express (single CPU) + * Cortex-A15 MPCore (V2P-CA15) + * + */ + +/dts-v1/; + +/ { + model = "XENVM-4.2"; + compatible = "xen,xenvm-4.2", "xen,xenvm"; + interrupt-parent = <&gic>; + #address-cells = <2>; + #size-cells = <2>; + + chosen { + /* this field is going to be adjusted by the hypervisor */ + bootargs = "console=hvc0 root=/dev/xvda"; + }; + + cpus { + #address-cells = <1>; + #size-cells = <0>; + + cpu@0 { + device_type = "cpu"; + compatible = "arm,cortex-a15"; + reg = <0>; + }; + }; + + memory@80000000 { + device_type = "memory"; + /* this field is going to be adjusted by the hypervisor */ + reg = <0 0x80000000 0 0x08000000>; + }; + + gic: interrupt-controller@2c001000 { + compatible = "arm,cortex-a15-gic", "arm,cortex-a9-gic"; + #interrupt-cells = <3>; + #address-cells = <0>; + interrupt-controller; + reg = <0 0x2c001000 0 0x1000>, + <0 0x2c002000 0 0x100>; + }; + + timer { + compatible = "arm,armv7-timer"; + interrupts = <1 13 0xf08>, + <1 14 0xf08>, + <1 11 0xf08>, + <1 10 0xf08>; + }; + + hypervisor { + compatible = "xen,xen-4.2", "xen,xen"; + /* this field is going to be adjusted by the hypervisor */ + reg = <0 0xb0000000 0 0x20000>; + /* this field is going to be adjusted by the hypervisor */ + interrupts = <1 15 0xf08>; + }; + + motherboard { + arm,v2m-memory-map = "rs1"; + }; +}; diff --git a/arch/arm/include/asm/hypervisor.h b/arch/arm/include/asm/hypervisor.h new file mode 100644 index 0000000..b90d9e5 --- /dev/null +++ b/arch/arm/include/asm/hypervisor.h @@ -0,0 +1,6 @@ +#ifndef _ASM_ARM_HYPERVISOR_H +#define _ASM_ARM_HYPERVISOR_H + +#include <asm/xen/hypervisor.h> + +#endif diff --git a/arch/arm/include/asm/sync_bitops.h b/arch/arm/include/asm/sync_bitops.h new file mode 100644 index 0000000..63479ee --- /dev/null +++ b/arch/arm/include/asm/sync_bitops.h @@ -0,0 +1,27 @@ +#ifndef __ASM_SYNC_BITOPS_H__ +#define __ASM_SYNC_BITOPS_H__ + +#include <asm/bitops.h> +#include <asm/system.h> + +/* sync_bitops functions are equivalent to the SMP implementation of the + * original functions, independently from CONFIG_SMP being defined. + * + * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But + * under Xen you might be communicating with a completely external entity + * who might be on another CPU (e.g. two uniprocessor guests communicating + * via event channels and grant tables). So we need a variant of the bit + * ops which are SMP safe even on a UP kernel. + */ + +#define sync_set_bit(nr, p) _set_bit(nr, p) +#define sync_clear_bit(nr, p) _clear_bit(nr, p) +#define sync_change_bit(nr, p) _change_bit(nr, p) +#define sync_test_and_set_bit(nr, p) _test_and_set_bit(nr, p) +#define sync_test_and_clear_bit(nr, p) _test_and_clear_bit(nr, p) +#define sync_test_and_change_bit(nr, p) _test_and_change_bit(nr, p) +#define sync_test_bit(nr, addr) test_bit(nr, addr) +#define sync_cmpxchg cmpxchg + + +#endif diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h new file mode 100644 index 0000000..94b4e90 --- /dev/null +++ b/arch/arm/include/asm/xen/events.h @@ -0,0 +1,18 @@ +#ifndef _ASM_ARM_XEN_EVENTS_H +#define _ASM_ARM_XEN_EVENTS_H + +#include <asm/ptrace.h> + +enum ipi_vector { + XEN_PLACEHOLDER_VECTOR, + + /* Xen IPIs go here */ + XEN_NR_IPIS, +}; + +static inline int xen_irqs_disabled(struct pt_regs *regs) +{ + return raw_irqs_disabled_flags(regs->ARM_cpsr); +} + +#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 0000000..8a82325 --- /dev/null +++ b/arch/arm/include/asm/xen/hypercall.h @@ -0,0 +1,69 @@ +/****************************************************************************** + * hypercall.h + * + * Linux-specific hypervisor handling. + * + * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation; or, when distributed + * separately from the Linux kernel or incorporated into other + * software packages, subject to the following license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this source file (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, modify, + * merge, publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#ifndef _ASM_ARM_XEN_HYPERCALL_H +#define _ASM_ARM_XEN_HYPERCALL_H + +#include <xen/interface/xen.h> + +long privcmd_call(unsigned call, unsigned long a1, + unsigned long a2, unsigned long a3, + unsigned long a4, unsigned long a5); +int HYPERVISOR_xen_version(int cmd, void *arg); +int HYPERVISOR_console_io(int cmd, int count, char *str); +int HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count); +int HYPERVISOR_sched_op(int cmd, void *arg); +int HYPERVISOR_event_channel_op(int cmd, void *arg); +unsigned long HYPERVISOR_hvm_op(int op, void *arg); +int HYPERVISOR_memory_op(unsigned int cmd, void *arg); +int HYPERVISOR_physdev_op(int cmd, void *arg); + +static inline void +MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va, + unsigned int new_val, unsigned long flags) +{ + BUG(); +} + +static inline void +MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req, + int count, int *success_count, domid_t domid) +{ + BUG(); +} + +static inline int +HYPERVISOR_multicall(void *call_list, int nr_calls) +{ + BUG(); +} +#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 0000000..d7ab99a --- /dev/null +++ b/arch/arm/include/asm/xen/hypervisor.h @@ -0,0 +1,19 @@ +#ifndef _ASM_ARM_XEN_HYPERVISOR_H +#define _ASM_ARM_XEN_HYPERVISOR_H + +extern struct shared_info *HYPERVISOR_shared_info; +extern struct start_info *xen_start_info; + +/* Lazy mode for batching updates / context switch */ +enum paravirt_lazy_mode { + PARAVIRT_LAZY_NONE, + PARAVIRT_LAZY_MMU, + PARAVIRT_LAZY_CPU, +}; + +static inline enum paravirt_lazy_mode paravirt_get_lazy_mode(void) +{ + return PARAVIRT_LAZY_NONE; +} + +#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 0000000..ae05e56 --- /dev/null +++ b/arch/arm/include/asm/xen/interface.h @@ -0,0 +1,73 @@ +/****************************************************************************** + * Guest OS interface to ARM Xen. + * + * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 + */ + +#ifndef _ASM_ARM_XEN_INTERFACE_H +#define _ASM_ARM_XEN_INTERFACE_H + +#include <linux/types.h> + +#define uint64_aligned_t uint64_t __attribute__((aligned(8))) + +#define __DEFINE_GUEST_HANDLE(name, type) \ + typedef struct { union { type *p; uint64_aligned_t q; }; } \ + __guest_handle_ ## name + +#define DEFINE_GUEST_HANDLE_STRUCT(name) \ + __DEFINE_GUEST_HANDLE(name, struct name) +#define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name) +#define GUEST_HANDLE(name) __guest_handle_ ## name + +#define set_xen_guest_handle(hnd, val) \ + do { \ + if (sizeof(hnd) == 8) \ + *(uint64_t *)&(hnd) = 0; \ + (hnd).p = val; \ + } while (0) + +#ifndef __ASSEMBLY__ +/* Explicitly size integers that represent pfns in the interface with + * Xen so that we can have one ABI that works for 32 and 64 bit guests. */ +typedef uint64_t xen_pfn_t; +typedef uint64_t xen_ulong_t; +/* Guest handles for primitive C types. */ +__DEFINE_GUEST_HANDLE(uchar, unsigned char); +__DEFINE_GUEST_HANDLE(uint, unsigned int); +__DEFINE_GUEST_HANDLE(ulong, unsigned long); +DEFINE_GUEST_HANDLE(char); +DEFINE_GUEST_HANDLE(int); +DEFINE_GUEST_HANDLE(long); +DEFINE_GUEST_HANDLE(void); +DEFINE_GUEST_HANDLE(uint64_t); +DEFINE_GUEST_HANDLE(uint32_t); +DEFINE_GUEST_HANDLE(xen_pfn_t); + +/* Maximum number of virtual CPUs in multi-processor guests. */ +#define MAX_VIRT_CPUS 1 + +struct arch_vcpu_info { }; +struct arch_shared_info { }; + +/* TODO: Move pvclock definitions some place arch independent */ +struct pvclock_vcpu_time_info { + u32 version; + u32 pad0; + u64 tsc_timestamp; + u64 system_time; + u32 tsc_to_system_mul; + s8 tsc_shift; + u8 flags; + u8 pad[2]; +} __attribute__((__packed__)); /* 32 bytes */ + +/* It is OK to have a 12 bytes struct with no padding because it is packed */ +struct pvclock_wall_clock { + u32 version; + u32 sec; + u32 nsec; +} __attribute__((__packed__)); +#endif + +#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 0000000..1742023 --- /dev/null +++ b/arch/arm/include/asm/xen/page.h @@ -0,0 +1,82 @@ +#ifndef _ASM_ARM_XEN_PAGE_H +#define _ASM_ARM_XEN_PAGE_H + +#include <asm/page.h> +#include <asm/pgtable.h> + +#include <linux/pfn.h> +#include <linux/types.h> + +#include <xen/interface/grant_table.h> + +#define pfn_to_mfn(pfn) (pfn) +#define phys_to_machine_mapping_valid (1) +#define mfn_to_pfn(mfn) (mfn) +#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) + +#define pte_mfn pte_pfn +#define mfn_pte pfn_pte + +/* Xen machine address */ +typedef struct xmaddr { + phys_addr_t maddr; +} xmaddr_t; + +/* Xen pseudo-physical address */ +typedef struct xpaddr { + phys_addr_t paddr; +} xpaddr_t; + +#define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) +#define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) + +static inline xmaddr_t phys_to_machine(xpaddr_t phys) +{ + unsigned offset = phys.paddr & ~PAGE_MASK; + return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); +} + +static inline xpaddr_t machine_to_phys(xmaddr_t machine) +{ + unsigned offset = machine.maddr & ~PAGE_MASK; + return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); +} +/* VIRT <-> MACHINE conversion */ +#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) +#define virt_to_pfn(v) (PFN_DOWN(__pa(v))) +#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) +#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) + +static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr) +{ + /* TODO: assuming it is mapped in the kernel 1:1 */ + return virt_to_machine(vaddr); +} + +/* TODO: this shouldn't be here but it is because the frontend drivers + * are using it (its rolled in headers) even though we won't hit the code path. + * So for right now just punt with this. + */ +static inline pte_t *lookup_address(unsigned long address, unsigned int *level) +{ + BUG(); + return NULL; +} + +static inline int m2p_add_override(unsigned long mfn, struct page *page, + struct gnttab_map_grant_ref *kmap_op) +{ + return 0; +} + +static inline int m2p_remove_override(struct page *page, bool clear_pte) +{ + return 0; +} + +static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) +{ + BUG(); + return false; +} +#endif /* _ASM_ARM_XEN_PAGE_H */ diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c index 5f6b7d5..560e0df 100644 --- a/arch/arm/mach-vexpress/v2m.c +++ b/arch/arm/mach-vexpress/v2m.c @@ -659,6 +659,7 @@ static void __init v2m_dt_init(void) const static char *v2m_dt_match[] __initconst = { "arm,vexpress", + "xen,xenvm", NULL, }; diff --git a/arch/arm/xen/Makefile b/arch/arm/xen/Makefile new file mode 100644 index 0000000..4384103 --- /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 0000000..59bcb96 --- /dev/null +++ b/arch/arm/xen/enlighten.c @@ -0,0 +1,168 @@ +#include <xen/xen.h> +#include <xen/events.h> +#include <xen/grant_table.h> +#include <xen/hvm.h> +#include <xen/interface/xen.h> +#include <xen/interface/memory.h> +#include <xen/interface/hvm/params.h> +#include <xen/features.h> +#include <xen/platform_pci.h> +#include <xen/xenbus.h> +#include <asm/xen/hypervisor.h> +#include <asm/xen/hypercall.h> +#include <linux/interrupt.h> +#include <linux/irqreturn.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> + +struct start_info _xen_start_info; +struct start_info *xen_start_info = &_xen_start_info; +EXPORT_SYMBOL_GPL(xen_start_info); + +enum xen_domain_type xen_domain_type = XEN_NATIVE; +EXPORT_SYMBOL_GPL(xen_domain_type); + +struct shared_info xen_dummy_shared_info; +struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; + +DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); + +/* TODO: to be removed */ +__read_mostly int xen_have_vector_callback; +EXPORT_SYMBOL_GPL(xen_have_vector_callback); + +int xen_platform_pci_unplug = XEN_UNPLUG_ALL; +EXPORT_SYMBOL_GPL(xen_platform_pci_unplug); + +static __read_mostly int xen_events_irq = -1; + +int xen_remap_domain_mfn_range(struct vm_area_struct *vma, + unsigned long addr, + unsigned long mfn, int nr, + pgprot_t prot, unsigned domid) +{ + return -ENOSYS; +} +EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range); + +/* + * see Documentation/devicetree/bindings/arm/xen.txt for the + * documentation of the Xen Device Tree format. + */ +#define GRANT_TABLE_PHYSADDR 0 +static int __init xen_guest_init(void) +{ + struct xen_add_to_physmap xatp; + static struct shared_info *shared_info_page = 0; + struct device_node *node; + int len; + const char *s = NULL; + const char *version = NULL; + const char *xen_prefix = "xen,xen-"; + struct resource res; + + node = of_find_compatible_node(NULL, NULL, "xen,xen"); + if (!node) { + pr_debug("No Xen support\n"); + return 0; + } + s = of_get_property(node, "compatible", &len); + if (strlen(xen_prefix) + 3 < len && + !strncmp(xen_prefix, s, strlen(xen_prefix))) + version = s + strlen(xen_prefix); + if (version == NULL) { + pr_debug("Xen version not found\n"); + return 0; + } + if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res)) + return 0; + xen_hvm_resume_frames = res.start >> PAGE_SHIFT; + xen_events_irq = irq_of_parse_and_map(node, 0); + pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n", + version, xen_events_irq, xen_hvm_resume_frames); + xen_domain_type = XEN_HVM_DOMAIN; + + xen_setup_features(); + if (xen_feature(XENFEAT_dom0)) + xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; + else + xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED); + + if (!shared_info_page) + shared_info_page = (struct shared_info *) + get_zeroed_page(GFP_KERNEL); + if (!shared_info_page) { + pr_err("not enough memory\n"); + return -ENOMEM; + } + xatp.domid = DOMID_SELF; + xatp.idx = 0; + xatp.space = XENMAPSPACE_shared_info; + xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; + if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) + BUG(); + + HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; + + /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info + * page, we use it in the event channel upcall and in some pvclock + * related functions. We don't need the vcpu_info placement + * optimizations because we don't use any pv_mmu or pv_irq op on + * HVM. + * The shared info contains exactly 1 CPU (the boot CPU). The guest + * is required to use VCPUOP_register_vcpu_info to place vcpu info + * for secondary CPUs as they are brought up. */ + per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; + + gnttab_init(); + if (!xen_initial_domain()) + xenbus_probe(NULL); + + return 0; +} +core_initcall(xen_guest_init); + +static irqreturn_t xen_arm_callback(int irq, void *arg) +{ + xen_hvm_evtchn_do_upcall(); + return IRQ_HANDLED; +} + +static int __init xen_init_events(void) +{ + if (!xen_domain() || xen_events_irq < 0) + return -ENODEV; + + xen_init_IRQ(); + + if (request_percpu_irq(xen_events_irq, xen_arm_callback, + "events", xen_vcpu)) { + pr_err("Error requesting IRQ %d\n", xen_events_irq); + return -EINVAL; + } + + enable_percpu_irq(xen_events_irq, 0); + + return 0; +} +postcore_initcall(xen_init_events); + +/* XXX: only until balloon is properly working */ +int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem) +{ + *pages = alloc_pages(highmem ? GFP_HIGHUSER : GFP_KERNEL, + get_order(nr_pages)); + if (*pages == NULL) + return -ENOMEM; + return 0; +} +EXPORT_SYMBOL_GPL(alloc_xenballooned_pages); + +void free_xenballooned_pages(int nr_pages, struct page **pages) +{ + kfree(*pages); + *pages = NULL; +} +EXPORT_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 0000000..dbd1330 --- /dev/null +++ b/arch/arm/xen/grant-table.c @@ -0,0 +1,53 @@ +/****************************************************************************** + * grant_table.c + * ARM specific part + * + * Granting foreign access to our memory reservation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation; or, when distributed + * separately from the Linux kernel or incorporated into other + * software packages, subject to the following license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this source file (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, modify, + * merge, publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include <xen/interface/xen.h> +#include <xen/page.h> +#include <xen/grant_table.h> + +int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes, + unsigned long max_nr_gframes, + void **__shared) +{ + return -ENOSYS; +} + +void arch_gnttab_unmap(void *shared, unsigned long nr_gframes) +{ + return; +} + +int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes, + unsigned long max_nr_gframes, + grant_status_t **__shared) +{ + return -ENOSYS; +} diff --git a/arch/arm/xen/hypercall.S b/arch/arm/xen/hypercall.S new file mode 100644 index 0000000..074f5ed --- /dev/null +++ b/arch/arm/xen/hypercall.S @@ -0,0 +1,106 @@ +/****************************************************************************** + * hypercall.S + * + * Xen hypercall wrappers + * + * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation; or, when distributed + * separately from the Linux kernel or incorporated into other + * software packages, subject to the following license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this source file (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, modify, + * merge, publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +/* + * The Xen hypercall calling convention is very similar to the ARM + * procedure calling convention: the first paramter is passed in r0, the + * second in r1, the third in r2 and the fourth in r3. Considering that + * Xen hypercalls have 5 arguments at most, the fifth paramter is passed + * in r4, differently from the procedure calling convention of using the + * stack for that case. + * + * The hypercall number is passed in r12. + * + * The return value is in r0. + * + * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM + * hypercall tag. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <xen/interface/xen.h> + + +/* HVC 0xEA1 */ +#ifdef CONFIG_THUMB2_KERNEL +#define xen_hvc .word 0xf7e08ea1 +#else +#define xen_hvc .word 0xe140ea71 +#endif + +#define HYPERCALL_SIMPLE(hypercall) \ +ENTRY(HYPERVISOR_##hypercall) \ + mov r12, #__HYPERVISOR_##hypercall; \ + xen_hvc; \ + mov pc, lr; \ +ENDPROC(HYPERVISOR_##hypercall) + +#define HYPERCALL0 HYPERCALL_SIMPLE +#define HYPERCALL1 HYPERCALL_SIMPLE +#define HYPERCALL2 HYPERCALL_SIMPLE +#define HYPERCALL3 HYPERCALL_SIMPLE +#define HYPERCALL4 HYPERCALL_SIMPLE + +#define HYPERCALL5(hypercall) \ +ENTRY(HYPERVISOR_##hypercall) \ + stmdb sp!, {r4} \ + ldr r4, [sp, #4] \ + mov r12, #__HYPERVISOR_##hypercall; \ + xen_hvc \ + ldm sp!, {r4} \ + mov pc, lr \ +ENDPROC(HYPERVISOR_##hypercall) + + .text + +HYPERCALL2(xen_version); +HYPERCALL3(console_io); +HYPERCALL3(grant_table_op); +HYPERCALL2(sched_op); +HYPERCALL2(event_channel_op); +HYPERCALL2(hvm_op); +HYPERCALL2(memory_op); +HYPERCALL2(physdev_op); + +ENTRY(privcmd_call) + stmdb sp!, {r4} + mov r12, r0 + mov r0, r1 + mov r1, r2 + mov r2, r3 + ldr r3, [sp, #8] + ldr r4, [sp, #4] + xen_hvc + ldm sp!, {r4} + mov pc, lr +ENDPROC(privcmd_call); |