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Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux...
[mv-sheeva.git] / arch / x86 / xen / setup.c
1 /*
2  * Machine specific setup for xen
3  *
4  * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
5  */
6
7 #include <linux/module.h>
8 #include <linux/sched.h>
9 #include <linux/mm.h>
10 #include <linux/pm.h>
11 #include <linux/memblock.h>
12
13 #include <asm/elf.h>
14 #include <asm/vdso.h>
15 #include <asm/e820.h>
16 #include <asm/setup.h>
17 #include <asm/acpi.h>
18 #include <asm/xen/hypervisor.h>
19 #include <asm/xen/hypercall.h>
20
21 #include <xen/page.h>
22 #include <xen/interface/callback.h>
23 #include <xen/interface/physdev.h>
24 #include <xen/interface/memory.h>
25 #include <xen/features.h>
26
27 #include "xen-ops.h"
28 #include "vdso.h"
29
30 /* These are code, but not functions.  Defined in entry.S */
31 extern const char xen_hypervisor_callback[];
32 extern const char xen_failsafe_callback[];
33 extern void xen_sysenter_target(void);
34 extern void xen_syscall_target(void);
35 extern void xen_syscall32_target(void);
36
37 static unsigned long __init xen_release_chunk(phys_addr_t start_addr,
38                                               phys_addr_t end_addr)
39 {
40         struct xen_memory_reservation reservation = {
41                 .address_bits = 0,
42                 .extent_order = 0,
43                 .domid        = DOMID_SELF
44         };
45         unsigned long start, end;
46         unsigned long len = 0;
47         unsigned long pfn;
48         int ret;
49
50         start = PFN_UP(start_addr);
51         end = PFN_DOWN(end_addr);
52
53         if (end <= start)
54                 return 0;
55
56         printk(KERN_INFO "xen_release_chunk: looking at area pfn %lx-%lx: ",
57                start, end);
58         for(pfn = start; pfn < end; pfn++) {
59                 unsigned long mfn = pfn_to_mfn(pfn);
60
61                 /* Make sure pfn exists to start with */
62                 if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
63                         continue;
64
65                 set_xen_guest_handle(reservation.extent_start, &mfn);
66                 reservation.nr_extents = 1;
67
68                 ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
69                                            &reservation);
70                 WARN(ret != 1, "Failed to release memory %lx-%lx err=%d\n",
71                      start, end, ret);
72                 if (ret == 1) {
73                         set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
74                         len++;
75                 }
76         }
77         printk(KERN_CONT "%ld pages freed\n", len);
78
79         return len;
80 }
81
82 static unsigned long __init xen_return_unused_memory(unsigned long max_pfn,
83                                                      const struct e820map *e820)
84 {
85         phys_addr_t max_addr = PFN_PHYS(max_pfn);
86         phys_addr_t last_end = 0;
87         unsigned long released = 0;
88         int i;
89
90         for (i = 0; i < e820->nr_map && last_end < max_addr; i++) {
91                 phys_addr_t end = e820->map[i].addr;
92                 end = min(max_addr, end);
93
94                 released += xen_release_chunk(last_end, end);
95                 last_end = e820->map[i].addr + e820->map[i].size;
96         }
97
98         if (last_end < max_addr)
99                 released += xen_release_chunk(last_end, max_addr);
100
101         printk(KERN_INFO "released %ld pages of unused memory\n", released);
102         return released;
103 }
104
105 /**
106  * machine_specific_memory_setup - Hook for machine specific memory setup.
107  **/
108
109 char * __init xen_memory_setup(void)
110 {
111         unsigned long max_pfn = xen_start_info->nr_pages;
112
113         max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
114
115         e820.nr_map = 0;
116
117         e820_add_region(0, PFN_PHYS((u64)max_pfn), E820_RAM);
118
119         /*
120          * Even though this is normal, usable memory under Xen, reserve
121          * ISA memory anyway because too many things think they can poke
122          * about in there.
123          */
124         e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
125                         E820_RESERVED);
126
127         /*
128          * Reserve Xen bits:
129          *  - mfn_list
130          *  - xen_start_info
131          * See comment above "struct start_info" in <xen/interface/xen.h>
132          */
133         memblock_x86_reserve_range(__pa(xen_start_info->mfn_list),
134                       __pa(xen_start_info->pt_base),
135                         "XEN START INFO");
136
137         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
138
139         xen_return_unused_memory(xen_start_info->nr_pages, &e820);
140
141         return "Xen";
142 }
143
144 static void xen_idle(void)
145 {
146         local_irq_disable();
147
148         if (need_resched())
149                 local_irq_enable();
150         else {
151                 current_thread_info()->status &= ~TS_POLLING;
152                 smp_mb__after_clear_bit();
153                 safe_halt();
154                 current_thread_info()->status |= TS_POLLING;
155         }
156 }
157
158 /*
159  * Set the bit indicating "nosegneg" library variants should be used.
160  * We only need to bother in pure 32-bit mode; compat 32-bit processes
161  * can have un-truncated segments, so wrapping around is allowed.
162  */
163 static void __init fiddle_vdso(void)
164 {
165 #ifdef CONFIG_X86_32
166         u32 *mask;
167         mask = VDSO32_SYMBOL(&vdso32_int80_start, NOTE_MASK);
168         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
169         mask = VDSO32_SYMBOL(&vdso32_sysenter_start, NOTE_MASK);
170         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
171 #endif
172 }
173
174 static __cpuinit int register_callback(unsigned type, const void *func)
175 {
176         struct callback_register callback = {
177                 .type = type,
178                 .address = XEN_CALLBACK(__KERNEL_CS, func),
179                 .flags = CALLBACKF_mask_events,
180         };
181
182         return HYPERVISOR_callback_op(CALLBACKOP_register, &callback);
183 }
184
185 void __cpuinit xen_enable_sysenter(void)
186 {
187         int ret;
188         unsigned sysenter_feature;
189
190 #ifdef CONFIG_X86_32
191         sysenter_feature = X86_FEATURE_SEP;
192 #else
193         sysenter_feature = X86_FEATURE_SYSENTER32;
194 #endif
195
196         if (!boot_cpu_has(sysenter_feature))
197                 return;
198
199         ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
200         if(ret != 0)
201                 setup_clear_cpu_cap(sysenter_feature);
202 }
203
204 void __cpuinit xen_enable_syscall(void)
205 {
206 #ifdef CONFIG_X86_64
207         int ret;
208
209         ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
210         if (ret != 0) {
211                 printk(KERN_ERR "Failed to set syscall callback: %d\n", ret);
212                 /* Pretty fatal; 64-bit userspace has no other
213                    mechanism for syscalls. */
214         }
215
216         if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
217                 ret = register_callback(CALLBACKTYPE_syscall32,
218                                         xen_syscall32_target);
219                 if (ret != 0)
220                         setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
221         }
222 #endif /* CONFIG_X86_64 */
223 }
224
225 void __init xen_arch_setup(void)
226 {
227         struct physdev_set_iopl set_iopl;
228         int rc;
229
230         xen_panic_handler_init();
231
232         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
233         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
234
235         if (!xen_feature(XENFEAT_auto_translated_physmap))
236                 HYPERVISOR_vm_assist(VMASST_CMD_enable,
237                                      VMASST_TYPE_pae_extended_cr3);
238
239         if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) ||
240             register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
241                 BUG();
242
243         xen_enable_sysenter();
244         xen_enable_syscall();
245
246         set_iopl.iopl = 1;
247         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
248         if (rc != 0)
249                 printk(KERN_INFO "physdev_op failed %d\n", rc);
250
251 #ifdef CONFIG_ACPI
252         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
253                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
254                 disable_acpi();
255         }
256 #endif
257
258         memcpy(boot_command_line, xen_start_info->cmd_line,
259                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
260                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
261
262         pm_idle = xen_idle;
263
264         paravirt_disable_iospace();
265
266         fiddle_vdso();
267 }