From f7ae240ea162f1bf80c2f9d58e42fac888f4320b Mon Sep 17 00:00:00 2001 From: Fathi Boudra Date: Thu, 23 May 2013 14:08:13 +0300 Subject: Initial commit - add 3.8.13 mainline Signed-off-by: Fathi Boudra --- arch/arm/xen/Makefile | 1 + arch/arm/xen/enlighten.c | 260 +++++++++++++++++++++++++++++++++++++++++++++ arch/arm/xen/grant-table.c | 53 +++++++++ arch/arm/xen/hypercall.S | 102 ++++++++++++++++++ 4 files changed, 416 insertions(+) create mode 100644 arch/arm/xen/Makefile create mode 100644 arch/arm/xen/enlighten.c create mode 100644 arch/arm/xen/grant-table.c create mode 100644 arch/arm/xen/hypercall.S (limited to 'arch/arm/xen') diff --git a/arch/arm/xen/Makefile b/arch/arm/xen/Makefile new file mode 100644 index 00000000..43841033 --- /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 00000000..01b20a20 --- /dev/null +++ b/arch/arm/xen/enlighten.c @@ -0,0 +1,260 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +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); + +/* These are unused until we support booting "pre-ballooned" */ +unsigned long xen_released_pages; +struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; + +/* 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; + +/* map fgmfn of domid to lpfn in the current domain */ +static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn, + unsigned int domid) +{ + int rc; + struct xen_add_to_physmap_range xatp = { + .domid = DOMID_SELF, + .foreign_domid = domid, + .size = 1, + .space = XENMAPSPACE_gmfn_foreign, + }; + xen_ulong_t idx = fgmfn; + xen_pfn_t gpfn = lpfn; + + set_xen_guest_handle(xatp.idxs, &idx); + set_xen_guest_handle(xatp.gpfns, &gpfn); + + rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp); + if (rc) { + pr_warn("Failed to map pfn to mfn rc:%d pfn:%lx mfn:%lx\n", + rc, lpfn, fgmfn); + return 1; + } + return 0; +} + +struct remap_data { + xen_pfn_t fgmfn; /* foreign domain's gmfn */ + pgprot_t prot; + domid_t domid; + struct vm_area_struct *vma; + int index; + struct page **pages; + struct xen_remap_mfn_info *info; +}; + +static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr, + void *data) +{ + struct remap_data *info = data; + struct page *page = info->pages[info->index++]; + unsigned long pfn = page_to_pfn(page); + pte_t pte = pfn_pte(pfn, info->prot); + + if (map_foreign_page(pfn, info->fgmfn, info->domid)) + return -EFAULT; + set_pte_at(info->vma->vm_mm, addr, ptep, pte); + + return 0; +} + +int xen_remap_domain_mfn_range(struct vm_area_struct *vma, + unsigned long addr, + xen_pfn_t mfn, int nr, + pgprot_t prot, unsigned domid, + struct page **pages) +{ + int err; + struct remap_data data; + + /* TBD: Batching, current sole caller only does page at a time */ + if (nr > 1) + return -EINVAL; + + data.fgmfn = mfn; + data.prot = prot; + data.domid = domid; + data.vma = vma; + data.index = 0; + data.pages = pages; + err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT, + remap_pte_fn, &data); + return err; +} +EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range); + +int xen_unmap_domain_mfn_range(struct vm_area_struct *vma, + int nr, struct page **pages) +{ + int i; + + for (i = 0; i < nr; i++) { + struct xen_remove_from_physmap xrp; + unsigned long rc, pfn; + + pfn = page_to_pfn(pages[i]); + + xrp.domid = DOMID_SELF; + xrp.gpfn = pfn; + rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp); + if (rc) { + pr_warn("Failed to unmap pfn:%lx rc:%ld\n", + pfn, rc); + return rc; + } + } + return 0; +} +EXPORT_SYMBOL_GPL(xen_unmap_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); + +/* In the hypervisor.S file. */ +EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); +EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); +EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); +EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); +EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); +EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); +EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); +EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); +EXPORT_SYMBOL_GPL(privcmd_call); diff --git a/arch/arm/xen/grant-table.c b/arch/arm/xen/grant-table.c new file mode 100644 index 00000000..859a9bb0 --- /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 +#include +#include + +int arch_gnttab_map_shared(xen_pfn_t *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 00000000..71f72398 --- /dev/null +++ b/arch/arm/xen/hypercall.S @@ -0,0 +1,102 @@ +/****************************************************************************** + * hypercall.S + * + * Xen hypercall wrappers + * + * Stefano Stabellini , 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 +#include +#include +#include + + +#define XEN_IMM 0xEA1 + +#define HYPERCALL_SIMPLE(hypercall) \ +ENTRY(HYPERVISOR_##hypercall) \ + mov r12, #__HYPERVISOR_##hypercall; \ + __HVC(XEN_IMM); \ + 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; \ + __HVC(XEN_IMM); \ + 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] + __HVC(XEN_IMM) + ldm sp!, {r4} + mov pc, lr +ENDPROC(privcmd_call); -- cgit v1.2.3