| /* |
| * Machine specific setup for xen |
| * |
| * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/pm.h> |
| |
| #include <asm/elf.h> |
| #include <asm/vdso.h> |
| #include <asm/e820.h> |
| #include <asm/setup.h> |
| #include <asm/acpi.h> |
| #include <asm/xen/hypervisor.h> |
| #include <asm/xen/hypercall.h> |
| |
| #include <xen/page.h> |
| #include <xen/interface/callback.h> |
| #include <xen/interface/memory.h> |
| #include <xen/interface/physdev.h> |
| #include <xen/interface/memory.h> |
| #include <xen/features.h> |
| |
| #include "xen-ops.h" |
| #include "vdso.h" |
| |
| /* These are code, but not functions. Defined in entry.S */ |
| extern const char xen_hypervisor_callback[]; |
| extern const char xen_failsafe_callback[]; |
| extern void xen_sysenter_target(void); |
| extern void xen_syscall_target(void); |
| extern void xen_syscall32_target(void); |
| |
| /* Amount of extra memory space we add to the e820 ranges */ |
| phys_addr_t xen_extra_mem_start, xen_extra_mem_size; |
| |
| static __init void xen_add_extra_mem(unsigned long pages) |
| { |
| u64 size = (u64)pages * PAGE_SIZE; |
| |
| if (!pages) |
| return; |
| |
| e820_add_region(xen_extra_mem_start + xen_extra_mem_size, size, E820_RAM); |
| sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
| |
| reserve_early(xen_extra_mem_start + xen_extra_mem_size, |
| xen_extra_mem_start + xen_extra_mem_size + size, |
| "XEN EXTRA"); |
| |
| xen_extra_mem_size += size; |
| } |
| |
| static unsigned long __init xen_release_chunk(phys_addr_t start_addr, |
| phys_addr_t end_addr) |
| { |
| struct xen_memory_reservation reservation = { |
| .address_bits = 0, |
| .extent_order = 0, |
| .domid = DOMID_SELF |
| }; |
| unsigned long start, end; |
| unsigned long len = 0; |
| unsigned long pfn; |
| int ret; |
| |
| start = PFN_UP(start_addr); |
| end = PFN_DOWN(end_addr); |
| |
| if (end <= start) |
| return 0; |
| |
| printk(KERN_INFO "xen_release_chunk: looking at area pfn %lx-%lx: ", |
| start, end); |
| for(pfn = start; pfn < end; pfn++) { |
| unsigned long mfn = pfn_to_mfn(pfn); |
| |
| /* Make sure pfn exists to start with */ |
| if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn) |
| continue; |
| |
| set_xen_guest_handle(reservation.extent_start, &mfn); |
| reservation.nr_extents = 1; |
| |
| ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, |
| &reservation); |
| WARN(ret != 1, "Failed to release memory %lx-%lx err=%d\n", |
| start, end, ret); |
| if (ret == 1) { |
| set_phys_to_machine(pfn, INVALID_P2M_ENTRY); |
| len++; |
| } |
| } |
| printk(KERN_CONT "%ld pages freed\n", len); |
| |
| return len; |
| } |
| |
| static unsigned long __init xen_return_unused_memory(unsigned long max_pfn, |
| const struct e820map *e820) |
| { |
| phys_addr_t max_addr = PFN_PHYS(max_pfn); |
| phys_addr_t last_end = 0; |
| unsigned long released = 0; |
| int i; |
| |
| for (i = 0; i < e820->nr_map && last_end < max_addr; i++) { |
| phys_addr_t end = e820->map[i].addr; |
| end = min(max_addr, end); |
| |
| released += xen_release_chunk(last_end, end); |
| last_end = e820->map[i].addr + e820->map[i].size; |
| } |
| |
| if (last_end < max_addr) |
| released += xen_release_chunk(last_end, max_addr); |
| |
| printk(KERN_INFO "released %ld pages of unused memory\n", released); |
| return released; |
| } |
| |
| /** |
| * machine_specific_memory_setup - Hook for machine specific memory setup. |
| **/ |
| char * __init xen_memory_setup(void) |
| { |
| static struct e820entry map[E820MAX] __initdata; |
| |
| unsigned long max_pfn = xen_start_info->nr_pages; |
| unsigned long long mem_end; |
| int rc; |
| struct xen_memory_map memmap; |
| unsigned long extra_pages = 0; |
| int i; |
| |
| max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); |
| mem_end = PFN_PHYS(max_pfn); |
| |
| memmap.nr_entries = E820MAX; |
| set_xen_guest_handle(memmap.buffer, map); |
| |
| rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); |
| if (rc == -ENOSYS) { |
| memmap.nr_entries = 1; |
| map[0].addr = 0ULL; |
| map[0].size = mem_end; |
| /* 8MB slack (to balance backend allocations). */ |
| map[0].size += 8ULL << 20; |
| map[0].type = E820_RAM; |
| rc = 0; |
| } |
| BUG_ON(rc); |
| |
| e820.nr_map = 0; |
| xen_extra_mem_start = mem_end; |
| for (i = 0; i < memmap.nr_entries; i++) { |
| unsigned long long end = map[i].addr + map[i].size; |
| if (map[i].type == E820_RAM) { |
| if (map[i].addr > mem_end) |
| continue; |
| if (end > mem_end) { |
| /* Truncate region to max_mem. */ |
| map[i].size -= end - mem_end; |
| |
| extra_pages += PFN_DOWN(end - mem_end); |
| } |
| } else if (map[i].type != E820_RAM) |
| xen_extra_mem_start = end; |
| if (map[i].size > 0) |
| e820_add_region(map[i].addr, map[i].size, map[i].type); |
| } |
| |
| /* |
| * Even though this is normal, usable memory under Xen, reserve |
| * ISA memory anyway because too many things think they can poke |
| * about in there. |
| */ |
| e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, |
| E820_RESERVED); |
| |
| /* |
| * Reserve Xen bits: |
| * - mfn_list |
| * - xen_start_info |
| * See comment above "struct start_info" in <xen/interface/xen.h> |
| */ |
| reserve_early(__pa(xen_start_info->mfn_list), |
| __pa(xen_start_info->pt_base), |
| "XEN START INFO"); |
| |
| sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
| |
| extra_pages += xen_return_unused_memory(xen_start_info->nr_pages, &e820); |
| |
| xen_add_extra_mem(extra_pages); |
| |
| return "Xen"; |
| } |
| |
| static void xen_idle(void) |
| { |
| local_irq_disable(); |
| |
| if (need_resched()) |
| local_irq_enable(); |
| else { |
| current_thread_info()->status &= ~TS_POLLING; |
| smp_mb__after_clear_bit(); |
| safe_halt(); |
| current_thread_info()->status |= TS_POLLING; |
| } |
| } |
| |
| /* |
| * Set the bit indicating "nosegneg" library variants should be used. |
| * We only need to bother in pure 32-bit mode; compat 32-bit processes |
| * can have un-truncated segments, so wrapping around is allowed. |
| */ |
| static void __init fiddle_vdso(void) |
| { |
| #ifdef CONFIG_X86_32 |
| u32 *mask; |
| mask = VDSO32_SYMBOL(&vdso32_int80_start, NOTE_MASK); |
| *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
| mask = VDSO32_SYMBOL(&vdso32_sysenter_start, NOTE_MASK); |
| *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
| #endif |
| } |
| |
| static __cpuinit int register_callback(unsigned type, const void *func) |
| { |
| struct callback_register callback = { |
| .type = type, |
| .address = XEN_CALLBACK(__KERNEL_CS, func), |
| .flags = CALLBACKF_mask_events, |
| }; |
| |
| return HYPERVISOR_callback_op(CALLBACKOP_register, &callback); |
| } |
| |
| void __cpuinit xen_enable_sysenter(void) |
| { |
| int ret; |
| unsigned sysenter_feature; |
| |
| #ifdef CONFIG_X86_32 |
| sysenter_feature = X86_FEATURE_SEP; |
| #else |
| sysenter_feature = X86_FEATURE_SYSENTER32; |
| #endif |
| |
| if (!boot_cpu_has(sysenter_feature)) |
| return; |
| |
| ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target); |
| if(ret != 0) |
| setup_clear_cpu_cap(sysenter_feature); |
| } |
| |
| void __cpuinit xen_enable_syscall(void) |
| { |
| #ifdef CONFIG_X86_64 |
| int ret; |
| |
| ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target); |
| if (ret != 0) { |
| printk(KERN_ERR "Failed to set syscall callback: %d\n", ret); |
| /* Pretty fatal; 64-bit userspace has no other |
| mechanism for syscalls. */ |
| } |
| |
| if (boot_cpu_has(X86_FEATURE_SYSCALL32)) { |
| ret = register_callback(CALLBACKTYPE_syscall32, |
| xen_syscall32_target); |
| if (ret != 0) |
| setup_clear_cpu_cap(X86_FEATURE_SYSCALL32); |
| } |
| #endif /* CONFIG_X86_64 */ |
| } |
| |
| void __init xen_arch_setup(void) |
| { |
| struct physdev_set_iopl set_iopl; |
| int rc; |
| |
| xen_panic_handler_init(); |
| |
| HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments); |
| HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables); |
| |
| if (!xen_feature(XENFEAT_auto_translated_physmap)) |
| HYPERVISOR_vm_assist(VMASST_CMD_enable, |
| VMASST_TYPE_pae_extended_cr3); |
| |
| if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) || |
| register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback)) |
| BUG(); |
| |
| xen_enable_sysenter(); |
| xen_enable_syscall(); |
| |
| set_iopl.iopl = 1; |
| rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); |
| if (rc != 0) |
| printk(KERN_INFO "physdev_op failed %d\n", rc); |
| |
| #ifdef CONFIG_ACPI |
| if (!(xen_start_info->flags & SIF_INITDOMAIN)) { |
| printk(KERN_INFO "ACPI in unprivileged domain disabled\n"); |
| disable_acpi(); |
| } |
| #endif |
| |
| memcpy(boot_command_line, xen_start_info->cmd_line, |
| MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ? |
| COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE); |
| |
| pm_idle = xen_idle; |
| |
| paravirt_disable_iospace(); |
| |
| fiddle_vdso(); |
| } |