2 * VMI specific paravirt-ops implementation
4 * Copyright (C) 2005, VMware, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * Send feedback to zach@vmware.com
25 #include <linux/module.h>
26 #include <linux/license.h>
27 #include <linux/cpu.h>
28 #include <linux/bootmem.h>
32 #include <asm/fixmap.h>
33 #include <asm/apicdef.h>
35 #include <asm/processor.h>
36 #include <asm/timer.h>
37 #include <asm/vmi_time.h>
39 /* Convenient for calling VMI functions indirectly in the ROM */
40 typedef u32 __attribute__((regparm(1))) (VROMFUNC)(void);
41 typedef u64 __attribute__((regparm(2))) (VROMLONGFUNC)(int);
43 #define call_vrom_func(rom,func) \
44 (((VROMFUNC *)(rom->func))())
46 #define call_vrom_long_func(rom,func,arg) \
47 (((VROMLONGFUNC *)(rom->func)) (arg))
49 static struct vrom_header *vmi_rom;
50 static int license_gplok;
51 static int disable_pge;
52 static int disable_pse;
53 static int disable_sep;
54 static int disable_tsc;
55 static int disable_mtrr;
56 static int disable_noidle;
58 /* Cached VMI operations */
60 void (*cpuid)(void /* non-c */);
61 void (*_set_ldt)(u32 selector);
62 void (*set_tr)(u32 selector);
63 void (*set_kernel_stack)(u32 selector, u32 esp0);
64 void (*allocate_page)(u32, u32, u32, u32, u32);
65 void (*release_page)(u32, u32);
66 void (*set_pte)(pte_t, pte_t *, unsigned);
67 void (*update_pte)(pte_t *, unsigned);
68 void (*set_linear_mapping)(int, u32, u32, u32);
69 void (*flush_tlb)(int);
70 void (*set_initial_ap_state)(int, int);
74 /* XXX move this to alternative.h */
75 extern struct paravirt_patch __start_parainstructions[],
76 __stop_parainstructions[];
79 * VMI patching routines.
81 #define MNEM_CALL 0xe8
85 static char irq_save_disable_callout[] = {
86 MNEM_CALL, 0, 0, 0, 0,
87 MNEM_CALL, 0, 0, 0, 0,
90 #define IRQ_PATCH_INT_MASK 0
91 #define IRQ_PATCH_DISABLE 5
93 static inline void patch_offset(unsigned char *eip, unsigned char *dest)
95 *(unsigned long *)(eip+1) = dest-eip-5;
98 static unsigned patch_internal(int call, unsigned len, void *insns)
101 struct vmi_relocation_info *const rel = (struct vmi_relocation_info *)&reloc;
102 reloc = call_vrom_long_func(vmi_rom, get_reloc, call);
104 case VMI_RELOCATION_CALL_REL:
106 *(char *)insns = MNEM_CALL;
107 patch_offset(insns, rel->eip);
110 case VMI_RELOCATION_JUMP_REL:
112 *(char *)insns = MNEM_JMP;
113 patch_offset(insns, rel->eip);
116 case VMI_RELOCATION_NOP:
117 /* obliterate the whole thing */
120 case VMI_RELOCATION_NONE:
121 /* leave native code in place */
131 * Apply patch if appropriate, return length of new instruction
132 * sequence. The callee does nop padding for us.
134 static unsigned vmi_patch(u8 type, u16 clobbers, void *insns, unsigned len)
137 case PARAVIRT_IRQ_DISABLE:
138 return patch_internal(VMI_CALL_DisableInterrupts, len, insns);
139 case PARAVIRT_IRQ_ENABLE:
140 return patch_internal(VMI_CALL_EnableInterrupts, len, insns);
141 case PARAVIRT_RESTORE_FLAGS:
142 return patch_internal(VMI_CALL_SetInterruptMask, len, insns);
143 case PARAVIRT_SAVE_FLAGS:
144 return patch_internal(VMI_CALL_GetInterruptMask, len, insns);
145 case PARAVIRT_SAVE_FLAGS_IRQ_DISABLE:
147 patch_internal(VMI_CALL_GetInterruptMask, len, insns);
148 patch_internal(VMI_CALL_DisableInterrupts, len-5, insns+5);
152 * You bastards didn't leave enough room to
153 * patch save_flags_irq_disable inline. Patch
157 *(char *)insns = MNEM_CALL;
158 patch_offset(insns, irq_save_disable_callout);
161 case PARAVIRT_INTERRUPT_RETURN:
162 return patch_internal(VMI_CALL_IRET, len, insns);
163 case PARAVIRT_STI_SYSEXIT:
164 return patch_internal(VMI_CALL_SYSEXIT, len, insns);
171 /* CPUID has non-C semantics, and paravirt-ops API doesn't match hardware ISA */
172 static void vmi_cpuid(unsigned int *eax, unsigned int *ebx,
173 unsigned int *ecx, unsigned int *edx)
178 asm volatile ("call *%6"
183 : "0" (*eax), "2" (*ecx), "r" (vmi_ops.cpuid));
186 *edx &= ~X86_FEATURE_PSE;
188 *edx &= ~X86_FEATURE_PGE;
190 *edx &= ~X86_FEATURE_SEP;
192 *edx &= ~X86_FEATURE_TSC;
194 *edx &= ~X86_FEATURE_MTRR;
198 static inline void vmi_maybe_load_tls(struct desc_struct *gdt, int nr, struct desc_struct *new)
200 if (gdt[nr].a != new->a || gdt[nr].b != new->b)
201 write_gdt_entry(gdt, nr, new->a, new->b);
204 static void vmi_load_tls(struct thread_struct *t, unsigned int cpu)
206 struct desc_struct *gdt = get_cpu_gdt_table(cpu);
207 vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 0, &t->tls_array[0]);
208 vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 1, &t->tls_array[1]);
209 vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 2, &t->tls_array[2]);
212 static void vmi_set_ldt(const void *addr, unsigned entries)
214 unsigned cpu = smp_processor_id();
217 pack_descriptor(&low, &high, (unsigned long)addr,
218 entries * sizeof(struct desc_struct) - 1,
220 write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, low, high);
221 vmi_ops._set_ldt(entries ? GDT_ENTRY_LDT*sizeof(struct desc_struct) : 0);
224 static void vmi_set_tr(void)
226 vmi_ops.set_tr(GDT_ENTRY_TSS*sizeof(struct desc_struct));
229 static void vmi_load_esp0(struct tss_struct *tss,
230 struct thread_struct *thread)
232 tss->esp0 = thread->esp0;
234 /* This can only happen when SEP is enabled, no need to test "SEP"arately */
235 if (unlikely(tss->ss1 != thread->sysenter_cs)) {
236 tss->ss1 = thread->sysenter_cs;
237 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
239 vmi_ops.set_kernel_stack(__KERNEL_DS, tss->esp0);
242 static void vmi_flush_tlb_user(void)
244 vmi_ops.flush_tlb(VMI_FLUSH_TLB);
247 static void vmi_flush_tlb_kernel(void)
249 vmi_ops.flush_tlb(VMI_FLUSH_TLB | VMI_FLUSH_GLOBAL);
252 /* Stub to do nothing at all; used for delays and unimplemented calls */
253 static void vmi_nop(void)
257 /* For NO_IDLE_HZ, we stop the clock when halting the kernel */
258 static fastcall void vmi_safe_halt(void)
260 int idle = vmi_stop_hz_timer();
264 vmi_account_time_restart_hz_timer();
269 #ifdef CONFIG_DEBUG_PAGE_TYPE
271 #ifdef CONFIG_X86_PAE
272 #define MAX_BOOT_PTS (2048+4+1)
274 #define MAX_BOOT_PTS (1024+1)
278 * During boot, mem_map is not yet available in paging_init, so stash
279 * all the boot page allocations here.
284 } boot_page_allocations[MAX_BOOT_PTS];
285 static int num_boot_page_allocations;
286 static int boot_allocations_applied;
288 void vmi_apply_boot_page_allocations(void)
292 for (i = 0; i < num_boot_page_allocations; i++) {
293 struct page *page = pfn_to_page(boot_page_allocations[i].pfn);
294 page->type = boot_page_allocations[i].type;
295 page->type = boot_page_allocations[i].type &
296 ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE);
298 boot_allocations_applied = 1;
301 static void record_page_type(u32 pfn, int type)
303 BUG_ON(num_boot_page_allocations >= MAX_BOOT_PTS);
304 boot_page_allocations[num_boot_page_allocations].pfn = pfn;
305 boot_page_allocations[num_boot_page_allocations].type = type;
306 num_boot_page_allocations++;
309 static void check_zeroed_page(u32 pfn, int type, struct page *page)
313 int limit = PAGE_SIZE / sizeof(int);
315 if (page_address(page))
316 ptr = (u32 *)page_address(page);
318 ptr = (u32 *)__va(pfn << PAGE_SHIFT);
320 * When cloning the root in non-PAE mode, only the userspace
321 * pdes need to be zeroed.
323 if (type & VMI_PAGE_CLONE)
324 limit = USER_PTRS_PER_PGD;
325 for (i = 0; i < limit; i++)
330 * We stash the page type into struct page so we can verify the page
331 * types are used properly.
333 static void vmi_set_page_type(u32 pfn, int type)
335 /* PAE can have multiple roots per page - don't track */
336 if (PTRS_PER_PMD > 1 && (type & VMI_PAGE_PDP))
339 if (boot_allocations_applied) {
340 struct page *page = pfn_to_page(pfn);
341 if (type != VMI_PAGE_NORMAL)
344 BUG_ON(page->type == VMI_PAGE_NORMAL);
345 page->type = type & ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE);
346 if (type & VMI_PAGE_ZEROED)
347 check_zeroed_page(pfn, type, page);
349 record_page_type(pfn, type);
353 static void vmi_check_page_type(u32 pfn, int type)
355 /* PAE can have multiple roots per page - skip checks */
356 if (PTRS_PER_PMD > 1 && (type & VMI_PAGE_PDP))
359 type &= ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE);
360 if (boot_allocations_applied) {
361 struct page *page = pfn_to_page(pfn);
362 BUG_ON((page->type ^ type) & VMI_PAGE_PAE);
363 BUG_ON(type == VMI_PAGE_NORMAL && page->type);
364 BUG_ON((type & page->type) == 0);
368 #define vmi_set_page_type(p,t) do { } while (0)
369 #define vmi_check_page_type(p,t) do { } while (0)
372 static void vmi_map_pt_hook(int type, pte_t *va, u32 pfn)
375 * Internally, the VMI ROM must map virtual addresses to physical
376 * addresses for processing MMU updates. By the time MMU updates
377 * are issued, this information is typically already lost.
378 * Fortunately, the VMI provides a cache of mapping slots for active
381 * We use slot zero for the linear mapping of physical memory, and
382 * in HIGHPTE kernels, slot 1 and 2 for KM_PTE0 and KM_PTE1.
384 * args: SLOT VA COUNT PFN
386 BUG_ON(type != KM_PTE0 && type != KM_PTE1);
387 vmi_ops.set_linear_mapping((type - KM_PTE0)+1, (u32)va, 1, pfn);
390 static void vmi_allocate_pt(u32 pfn)
392 vmi_set_page_type(pfn, VMI_PAGE_L1);
393 vmi_ops.allocate_page(pfn, VMI_PAGE_L1, 0, 0, 0);
396 static void vmi_allocate_pd(u32 pfn)
399 * This call comes in very early, before mem_map is setup.
400 * It is called only for swapper_pg_dir, which already has
403 vmi_set_page_type(pfn, VMI_PAGE_L2);
404 vmi_ops.allocate_page(pfn, VMI_PAGE_L2, 0, 0, 0);
407 static void vmi_allocate_pd_clone(u32 pfn, u32 clonepfn, u32 start, u32 count)
409 vmi_set_page_type(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE);
410 vmi_check_page_type(clonepfn, VMI_PAGE_L2);
411 vmi_ops.allocate_page(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE, clonepfn, start, count);
414 static void vmi_release_pt(u32 pfn)
416 vmi_ops.release_page(pfn, VMI_PAGE_L1);
417 vmi_set_page_type(pfn, VMI_PAGE_NORMAL);
420 static void vmi_release_pd(u32 pfn)
422 vmi_ops.release_page(pfn, VMI_PAGE_L2);
423 vmi_set_page_type(pfn, VMI_PAGE_NORMAL);
427 * Helper macros for MMU update flags. We can defer updates until a flush
428 * or page invalidation only if the update is to the current address space
429 * (otherwise, there is no flush). We must check against init_mm, since
430 * this could be a kernel update, which usually passes init_mm, although
431 * sometimes this check can be skipped if we know the particular function
432 * is only called on user mode PTEs. We could change the kernel to pass
433 * current->active_mm here, but in particular, I was unsure if changing
434 * mm/highmem.c to do this would still be correct on other architectures.
436 #define is_current_as(mm, mustbeuser) ((mm) == current->active_mm || \
437 (!mustbeuser && (mm) == &init_mm))
438 #define vmi_flags_addr(mm, addr, level, user) \
439 ((level) | (is_current_as(mm, user) ? \
440 (VMI_PAGE_CURRENT_AS | ((addr) & VMI_PAGE_VA_MASK)) : 0))
441 #define vmi_flags_addr_defer(mm, addr, level, user) \
442 ((level) | (is_current_as(mm, user) ? \
443 (VMI_PAGE_DEFER | VMI_PAGE_CURRENT_AS | ((addr) & VMI_PAGE_VA_MASK)) : 0))
445 static void vmi_update_pte(struct mm_struct *mm, u32 addr, pte_t *ptep)
447 vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
448 vmi_ops.update_pte(ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0));
451 static void vmi_update_pte_defer(struct mm_struct *mm, u32 addr, pte_t *ptep)
453 vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
454 vmi_ops.update_pte(ptep, vmi_flags_addr_defer(mm, addr, VMI_PAGE_PT, 0));
457 static void vmi_set_pte(pte_t *ptep, pte_t pte)
459 /* XXX because of set_pmd_pte, this can be called on PT or PD layers */
460 vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE | VMI_PAGE_PD);
461 vmi_ops.set_pte(pte, ptep, VMI_PAGE_PT);
464 static void vmi_set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pte)
466 vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
467 vmi_ops.set_pte(pte, ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0));
470 static void vmi_set_pmd(pmd_t *pmdp, pmd_t pmdval)
472 #ifdef CONFIG_X86_PAE
473 const pte_t pte = { pmdval.pmd, pmdval.pmd >> 32 };
474 vmi_check_page_type(__pa(pmdp) >> PAGE_SHIFT, VMI_PAGE_PMD);
476 const pte_t pte = { pmdval.pud.pgd.pgd };
477 vmi_check_page_type(__pa(pmdp) >> PAGE_SHIFT, VMI_PAGE_PGD);
479 vmi_ops.set_pte(pte, (pte_t *)pmdp, VMI_PAGE_PD);
482 #ifdef CONFIG_X86_PAE
484 static void vmi_set_pte_atomic(pte_t *ptep, pte_t pteval)
487 * XXX This is called from set_pmd_pte, but at both PT
488 * and PD layers so the VMI_PAGE_PT flag is wrong. But
489 * it is only called for large page mapping changes,
490 * the Xen backend, doesn't support large pages, and the
491 * ESX backend doesn't depend on the flag.
493 set_64bit((unsigned long long *)ptep,pte_val(pteval));
494 vmi_ops.update_pte(ptep, VMI_PAGE_PT);
497 static void vmi_set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
499 vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
500 vmi_ops.set_pte(pte, ptep, vmi_flags_addr_defer(mm, addr, VMI_PAGE_PT, 1));
503 static void vmi_set_pud(pud_t *pudp, pud_t pudval)
506 const pte_t pte = { pudval.pgd.pgd, pudval.pgd.pgd >> 32 };
507 vmi_check_page_type(__pa(pudp) >> PAGE_SHIFT, VMI_PAGE_PGD);
508 vmi_ops.set_pte(pte, (pte_t *)pudp, VMI_PAGE_PDP);
511 static void vmi_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
513 const pte_t pte = { 0 };
514 vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
515 vmi_ops.set_pte(pte, ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0));
518 void vmi_pmd_clear(pmd_t *pmd)
520 const pte_t pte = { 0 };
521 vmi_check_page_type(__pa(pmd) >> PAGE_SHIFT, VMI_PAGE_PMD);
522 vmi_ops.set_pte(pte, (pte_t *)pmd, VMI_PAGE_PD);
527 struct vmi_ap_state ap;
528 extern void setup_pda(void);
530 static void __init /* XXX cpu hotplug */
531 vmi_startup_ipi_hook(int phys_apicid, unsigned long start_eip,
532 unsigned long start_esp)
534 /* Default everything to zero. This is fine for most GPRs. */
535 memset(&ap, 0, sizeof(struct vmi_ap_state));
537 ap.gdtr_limit = GDT_SIZE - 1;
538 ap.gdtr_base = (unsigned long) get_cpu_gdt_table(phys_apicid);
540 ap.idtr_limit = IDT_ENTRIES * 8 - 1;
541 ap.idtr_base = (unsigned long) idt_table;
546 ap.eip = (unsigned long) start_eip;
548 ap.esp = (unsigned long) start_esp;
552 ap.fs = __KERNEL_PDA;
559 #ifdef CONFIG_X86_PAE
560 /* efer should match BSP efer. */
563 rdmsr(MSR_EFER, l, h);
564 ap.efer = (unsigned long long) h << 32 | l;
568 ap.cr3 = __pa(swapper_pg_dir);
569 /* Protected mode, paging, AM, WP, NE, MP. */
571 ap.cr4 = mmu_cr4_features;
572 vmi_ops.set_initial_ap_state(__pa(&ap), phys_apicid);
576 static inline int __init check_vmi_rom(struct vrom_header *rom)
578 struct pci_header *pci;
579 struct pnp_header *pnp;
580 const char *manufacturer = "UNKNOWN";
581 const char *product = "UNKNOWN";
582 const char *license = "unspecified";
584 if (rom->rom_signature != 0xaa55)
586 if (rom->vrom_signature != VMI_SIGNATURE)
588 if (rom->api_version_maj != VMI_API_REV_MAJOR ||
589 rom->api_version_min+1 < VMI_API_REV_MINOR+1) {
590 printk(KERN_WARNING "VMI: Found mismatched rom version %d.%d\n",
591 rom->api_version_maj,
592 rom->api_version_min);
597 * Relying on the VMI_SIGNATURE field is not 100% safe, so check
598 * the PCI header and device type to make sure this is really a
601 if (!rom->pci_header_offs) {
602 printk(KERN_WARNING "VMI: ROM does not contain PCI header.\n");
606 pci = (struct pci_header *)((char *)rom+rom->pci_header_offs);
607 if (pci->vendorID != PCI_VENDOR_ID_VMWARE ||
608 pci->deviceID != PCI_DEVICE_ID_VMWARE_VMI) {
609 /* Allow it to run... anyways, but warn */
610 printk(KERN_WARNING "VMI: ROM from unknown manufacturer\n");
613 if (rom->pnp_header_offs) {
614 pnp = (struct pnp_header *)((char *)rom+rom->pnp_header_offs);
615 if (pnp->manufacturer_offset)
616 manufacturer = (const char *)rom+pnp->manufacturer_offset;
617 if (pnp->product_offset)
618 product = (const char *)rom+pnp->product_offset;
621 if (rom->license_offs)
622 license = (char *)rom+rom->license_offs;
624 printk(KERN_INFO "VMI: Found %s %s, API version %d.%d, ROM version %d.%d\n",
625 manufacturer, product,
626 rom->api_version_maj, rom->api_version_min,
627 pci->rom_version_maj, pci->rom_version_min);
629 license_gplok = license_is_gpl_compatible(license);
630 if (!license_gplok) {
631 printk(KERN_WARNING "VMI: ROM license '%s' taints kernel... "
632 "inlining disabled\n",
634 add_taint(TAINT_PROPRIETARY_MODULE);
640 * Probe for the VMI option ROM
642 static inline int __init probe_vmi_rom(void)
646 /* VMI ROM is in option ROM area, check signature */
647 for (base = 0xC0000; base < 0xE0000; base += 2048) {
648 struct vrom_header *romstart;
649 romstart = (struct vrom_header *)isa_bus_to_virt(base);
650 if (check_vmi_rom(romstart)) {
659 * VMI setup common to all processors
661 void vmi_bringup(void)
663 /* We must establish the lowmem mapping for MMU ops to work */
665 vmi_ops.set_linear_mapping(0, __PAGE_OFFSET, max_low_pfn, 0);
669 * Return a pointer to the VMI function or a NOP stub
671 static void *vmi_get_function(int vmicall)
674 const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc;
675 reloc = call_vrom_long_func(vmi_rom, get_reloc, vmicall);
676 BUG_ON(rel->type == VMI_RELOCATION_JUMP_REL);
677 if (rel->type == VMI_RELOCATION_CALL_REL)
678 return (void *)rel->eip;
680 return (void *)vmi_nop;
684 * Helper macro for making the VMI paravirt-ops fill code readable.
685 * For unimplemented operations, fall back to default.
687 #define para_fill(opname, vmicall) \
689 reloc = call_vrom_long_func(vmi_rom, get_reloc, \
690 VMI_CALL_##vmicall); \
691 if (rel->type != VMI_RELOCATION_NONE) { \
692 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL); \
693 paravirt_ops.opname = (void *)rel->eip; \
698 * Activate the VMI interface and switch into paravirtualized mode
700 static inline int __init activate_vmi(void)
704 const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc;
706 if (call_vrom_func(vmi_rom, vmi_init) != 0) {
707 printk(KERN_ERR "VMI ROM failed to initialize!");
710 savesegment(cs, kernel_cs);
712 paravirt_ops.paravirt_enabled = 1;
713 paravirt_ops.kernel_rpl = kernel_cs & SEGMENT_RPL_MASK;
715 paravirt_ops.patch = vmi_patch;
716 paravirt_ops.name = "vmi";
719 * Many of these operations are ABI compatible with VMI.
720 * This means we can fill in the paravirt-ops with direct
721 * pointers into the VMI ROM. If the calling convention for
722 * these operations changes, this code needs to be updated.
725 * CPUID paravirt-op uses pointers, not the native ISA
726 * halt has no VMI equivalent; all VMI halts are "safe"
727 * no MSR support yet - just trap and emulate. VMI uses the
728 * same ABI as the native ISA, but Linux wants exceptions
729 * from bogus MSR read / write handled
730 * rdpmc is not yet used in Linux
733 /* CPUID is special, so very special */
734 reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_CPUID);
735 if (rel->type != VMI_RELOCATION_NONE) {
736 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
737 vmi_ops.cpuid = (void *)rel->eip;
738 paravirt_ops.cpuid = vmi_cpuid;
741 para_fill(clts, CLTS);
742 para_fill(get_debugreg, GetDR);
743 para_fill(set_debugreg, SetDR);
744 para_fill(read_cr0, GetCR0);
745 para_fill(read_cr2, GetCR2);
746 para_fill(read_cr3, GetCR3);
747 para_fill(read_cr4, GetCR4);
748 para_fill(write_cr0, SetCR0);
749 para_fill(write_cr2, SetCR2);
750 para_fill(write_cr3, SetCR3);
751 para_fill(write_cr4, SetCR4);
752 para_fill(save_fl, GetInterruptMask);
753 para_fill(restore_fl, SetInterruptMask);
754 para_fill(irq_disable, DisableInterrupts);
755 para_fill(irq_enable, EnableInterrupts);
756 /* irq_save_disable !!! sheer pain */
757 patch_offset(&irq_save_disable_callout[IRQ_PATCH_INT_MASK],
758 (char *)paravirt_ops.save_fl);
759 patch_offset(&irq_save_disable_callout[IRQ_PATCH_DISABLE],
760 (char *)paravirt_ops.irq_disable);
762 para_fill(wbinvd, WBINVD);
763 /* paravirt_ops.read_msr = vmi_rdmsr */
764 /* paravirt_ops.write_msr = vmi_wrmsr */
765 para_fill(read_tsc, RDTSC);
766 /* paravirt_ops.rdpmc = vmi_rdpmc */
768 /* TR interface doesn't pass TR value */
769 reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetTR);
770 if (rel->type != VMI_RELOCATION_NONE) {
771 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
772 vmi_ops.set_tr = (void *)rel->eip;
773 paravirt_ops.load_tr_desc = vmi_set_tr;
776 /* LDT is special, too */
777 reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetLDT);
778 if (rel->type != VMI_RELOCATION_NONE) {
779 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
780 vmi_ops._set_ldt = (void *)rel->eip;
781 paravirt_ops.set_ldt = vmi_set_ldt;
784 para_fill(load_gdt, SetGDT);
785 para_fill(load_idt, SetIDT);
786 para_fill(store_gdt, GetGDT);
787 para_fill(store_idt, GetIDT);
788 para_fill(store_tr, GetTR);
789 paravirt_ops.load_tls = vmi_load_tls;
790 para_fill(write_ldt_entry, WriteLDTEntry);
791 para_fill(write_gdt_entry, WriteGDTEntry);
792 para_fill(write_idt_entry, WriteIDTEntry);
793 reloc = call_vrom_long_func(vmi_rom, get_reloc,
794 VMI_CALL_UpdateKernelStack);
795 if (rel->type != VMI_RELOCATION_NONE) {
796 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
797 vmi_ops.set_kernel_stack = (void *)rel->eip;
798 paravirt_ops.load_esp0 = vmi_load_esp0;
801 para_fill(set_iopl_mask, SetIOPLMask);
802 paravirt_ops.io_delay = (void *)vmi_nop;
804 para_fill(set_lazy_mode, SetLazyMode);
806 reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_FlushTLB);
807 if (rel->type != VMI_RELOCATION_NONE) {
808 vmi_ops.flush_tlb = (void *)rel->eip;
809 paravirt_ops.flush_tlb_user = vmi_flush_tlb_user;
810 paravirt_ops.flush_tlb_kernel = vmi_flush_tlb_kernel;
812 para_fill(flush_tlb_single, InvalPage);
815 * Until a standard flag format can be agreed on, we need to
816 * implement these as wrappers in Linux. Get the VMI ROM
817 * function pointers for the two backend calls.
819 #ifdef CONFIG_X86_PAE
820 vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxELong);
821 vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxELong);
823 vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxE);
824 vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxE);
826 vmi_ops.set_linear_mapping = vmi_get_function(VMI_CALL_SetLinearMapping);
827 vmi_ops.allocate_page = vmi_get_function(VMI_CALL_AllocatePage);
828 vmi_ops.release_page = vmi_get_function(VMI_CALL_ReleasePage);
830 paravirt_ops.map_pt_hook = vmi_map_pt_hook;
831 paravirt_ops.alloc_pt = vmi_allocate_pt;
832 paravirt_ops.alloc_pd = vmi_allocate_pd;
833 paravirt_ops.alloc_pd_clone = vmi_allocate_pd_clone;
834 paravirt_ops.release_pt = vmi_release_pt;
835 paravirt_ops.release_pd = vmi_release_pd;
836 paravirt_ops.set_pte = vmi_set_pte;
837 paravirt_ops.set_pte_at = vmi_set_pte_at;
838 paravirt_ops.set_pmd = vmi_set_pmd;
839 paravirt_ops.pte_update = vmi_update_pte;
840 paravirt_ops.pte_update_defer = vmi_update_pte_defer;
841 #ifdef CONFIG_X86_PAE
842 paravirt_ops.set_pte_atomic = vmi_set_pte_atomic;
843 paravirt_ops.set_pte_present = vmi_set_pte_present;
844 paravirt_ops.set_pud = vmi_set_pud;
845 paravirt_ops.pte_clear = vmi_pte_clear;
846 paravirt_ops.pmd_clear = vmi_pmd_clear;
849 * These MUST always be patched. Don't support indirect jumps
850 * through these operations, as the VMI interface may use either
851 * a jump or a call to get to these operations, depending on
852 * the backend. They are performance critical anyway, so requiring
853 * a patch is not a big problem.
855 paravirt_ops.irq_enable_sysexit = (void *)0xfeedbab0;
856 paravirt_ops.iret = (void *)0xbadbab0;
859 paravirt_ops.startup_ipi_hook = vmi_startup_ipi_hook;
860 vmi_ops.set_initial_ap_state = vmi_get_function(VMI_CALL_SetInitialAPState);
863 #ifdef CONFIG_X86_LOCAL_APIC
864 paravirt_ops.apic_read = vmi_get_function(VMI_CALL_APICRead);
865 paravirt_ops.apic_write = vmi_get_function(VMI_CALL_APICWrite);
866 paravirt_ops.apic_write_atomic = vmi_get_function(VMI_CALL_APICWrite);
870 * Check for VMI timer functionality by probing for a cycle frequency method
872 reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_GetCycleFrequency);
873 if (rel->type != VMI_RELOCATION_NONE) {
874 vmi_timer_ops.get_cycle_frequency = (void *)rel->eip;
875 vmi_timer_ops.get_cycle_counter =
876 vmi_get_function(VMI_CALL_GetCycleCounter);
877 vmi_timer_ops.get_wallclock =
878 vmi_get_function(VMI_CALL_GetWallclockTime);
879 vmi_timer_ops.wallclock_updated =
880 vmi_get_function(VMI_CALL_WallclockUpdated);
881 vmi_timer_ops.set_alarm = vmi_get_function(VMI_CALL_SetAlarm);
882 vmi_timer_ops.cancel_alarm =
883 vmi_get_function(VMI_CALL_CancelAlarm);
884 paravirt_ops.time_init = vmi_time_init;
885 paravirt_ops.get_wallclock = vmi_get_wallclock;
886 paravirt_ops.set_wallclock = vmi_set_wallclock;
887 #ifdef CONFIG_X86_LOCAL_APIC
888 paravirt_ops.setup_boot_clock = vmi_timer_setup_boot_alarm;
889 paravirt_ops.setup_secondary_clock = vmi_timer_setup_secondary_alarm;
891 paravirt_ops.get_scheduled_cycles = vmi_get_sched_cycles;
892 paravirt_ops.get_cpu_khz = vmi_cpu_khz;
895 para_fill(safe_halt, Halt);
897 vmi_ops.halt = vmi_get_function(VMI_CALL_Halt);
898 paravirt_ops.safe_halt = vmi_safe_halt;
902 * Alternative instruction rewriting doesn't happen soon enough
903 * to convert VMI_IRET to a call instead of a jump; so we have
904 * to do this before IRQs get reenabled. Fortunately, it is
907 apply_paravirt(__start_parainstructions, __stop_parainstructions);
916 void __init vmi_init(void)
923 check_vmi_rom(vmi_rom);
925 /* In case probing for or validating the ROM failed, basil */
929 reserve_top_address(-vmi_rom->virtual_top);
931 local_irq_save(flags);
934 #ifdef CONFIG_X86_IO_APIC
937 no_sync_cmos_clock = 1;
939 local_irq_restore(flags & X86_EFLAGS_IF);
942 static int __init parse_vmi(char *arg)
947 if (!strcmp(arg, "disable_pge")) {
948 clear_bit(X86_FEATURE_PGE, boot_cpu_data.x86_capability);
950 } else if (!strcmp(arg, "disable_pse")) {
951 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
953 } else if (!strcmp(arg, "disable_sep")) {
954 clear_bit(X86_FEATURE_SEP, boot_cpu_data.x86_capability);
956 } else if (!strcmp(arg, "disable_tsc")) {
957 clear_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability);
959 } else if (!strcmp(arg, "disable_mtrr")) {
960 clear_bit(X86_FEATURE_MTRR, boot_cpu_data.x86_capability);
962 } else if (!strcmp(arg, "disable_noidle"))
967 early_param("vmi", parse_vmi);