1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Paravirtualization interfaces 3 Copyright (C) 2006 Rusty Russell IBM Corporation 4 5 6 2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc 7 */ 8 9 #include <linux/errno.h> 10 #include <linux/init.h> 11 #include <linux/export.h> 12 #include <linux/efi.h> 13 #include <linux/bcd.h> 14 #include <linux/highmem.h> 15 #include <linux/kprobes.h> 16 #include <linux/pgtable.h> 17 #include <linux/static_call.h> 18 19 #include <asm/bug.h> 20 #include <asm/paravirt.h> 21 #include <asm/debugreg.h> 22 #include <asm/desc.h> 23 #include <asm/setup.h> 24 #include <asm/time.h> 25 #include <asm/pgalloc.h> 26 #include <asm/irq.h> 27 #include <asm/cpuid/api.h> 28 #include <asm/delay.h> 29 #include <asm/fixmap.h> 30 #include <asm/apic.h> 31 #include <asm/tlbflush.h> 32 #include <asm/timer.h> 33 #include <asm/special_insns.h> 34 #include <asm/tlb.h> 35 #include <asm/io_bitmap.h> 36 #include <asm/gsseg.h> 37 #include <asm/msr.h> 38 39 /* stub always returning 0. */ 40 DEFINE_ASM_FUNC(paravirt_ret0, "xor %eax,%eax", .entry.text); 41 42 void __init default_banner(void) 43 { 44 printk(KERN_INFO "Booting paravirtualized kernel on %s\n", 45 pv_info.name); 46 } 47 48 #ifdef CONFIG_PARAVIRT_XXL 49 unsigned long pv_native_save_fl(void); 50 void pv_native_irq_disable(void); 51 void pv_native_irq_enable(void); 52 unsigned long pv_native_read_cr2(void); 53 54 DEFINE_ASM_FUNC(_paravirt_ident_64, "mov %rdi, %rax", .text); 55 DEFINE_ASM_FUNC(pv_native_save_fl, "pushf; pop %rax", .noinstr.text); 56 DEFINE_ASM_FUNC(pv_native_irq_disable, "cli", .noinstr.text); 57 DEFINE_ASM_FUNC(pv_native_irq_enable, "sti", .noinstr.text); 58 DEFINE_ASM_FUNC(pv_native_read_cr2, "mov %cr2, %rax", .noinstr.text); 59 #endif 60 61 static noinstr void pv_native_safe_halt(void) 62 { 63 native_safe_halt(); 64 } 65 66 #ifdef CONFIG_PARAVIRT_XXL 67 static noinstr void pv_native_write_cr2(unsigned long val) 68 { 69 native_write_cr2(val); 70 } 71 72 static noinstr unsigned long pv_native_read_cr3(void) 73 { 74 return __native_read_cr3(); 75 } 76 77 static noinstr void pv_native_write_cr3(unsigned long cr3) 78 { 79 native_write_cr3(cr3); 80 } 81 82 static noinstr unsigned long pv_native_get_debugreg(int regno) 83 { 84 return native_get_debugreg(regno); 85 } 86 87 static noinstr void pv_native_set_debugreg(int regno, unsigned long val) 88 { 89 native_set_debugreg(regno, val); 90 } 91 #endif 92 93 struct pv_info pv_info = { 94 .name = "bare hardware", 95 #ifdef CONFIG_PARAVIRT_XXL 96 .extra_user_64bit_cs = __USER_CS, 97 #endif 98 .io_delay = true, 99 }; 100 101 /* 64-bit pagetable entries */ 102 #define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64) 103 104 struct paravirt_patch_template pv_ops = { 105 /* Cpu ops. */ 106 #ifdef CONFIG_PARAVIRT_XXL 107 .cpu.cpuid = native_cpuid, 108 .cpu.get_debugreg = pv_native_get_debugreg, 109 .cpu.set_debugreg = pv_native_set_debugreg, 110 .cpu.read_cr0 = native_read_cr0, 111 .cpu.write_cr0 = native_write_cr0, 112 .cpu.write_cr4 = native_write_cr4, 113 .cpu.read_msr = native_read_msr, 114 .cpu.write_msr = native_write_msr, 115 .cpu.read_msr_safe = native_read_msr_safe, 116 .cpu.write_msr_safe = native_write_msr_safe, 117 .cpu.read_pmc = native_read_pmc, 118 .cpu.load_tr_desc = native_load_tr_desc, 119 .cpu.set_ldt = native_set_ldt, 120 .cpu.load_gdt = native_load_gdt, 121 .cpu.load_idt = native_load_idt, 122 .cpu.store_tr = native_store_tr, 123 .cpu.load_tls = native_load_tls, 124 .cpu.load_gs_index = native_load_gs_index, 125 .cpu.write_ldt_entry = native_write_ldt_entry, 126 .cpu.write_gdt_entry = native_write_gdt_entry, 127 .cpu.write_idt_entry = native_write_idt_entry, 128 129 .cpu.alloc_ldt = paravirt_nop, 130 .cpu.free_ldt = paravirt_nop, 131 132 .cpu.load_sp0 = native_load_sp0, 133 134 #ifdef CONFIG_X86_IOPL_IOPERM 135 .cpu.invalidate_io_bitmap = native_tss_invalidate_io_bitmap, 136 .cpu.update_io_bitmap = native_tss_update_io_bitmap, 137 #endif 138 139 .cpu.start_context_switch = paravirt_nop, 140 .cpu.end_context_switch = paravirt_nop, 141 142 /* Irq ops. */ 143 .irq.save_fl = __PV_IS_CALLEE_SAVE(pv_native_save_fl), 144 .irq.irq_disable = __PV_IS_CALLEE_SAVE(pv_native_irq_disable), 145 .irq.irq_enable = __PV_IS_CALLEE_SAVE(pv_native_irq_enable), 146 #endif /* CONFIG_PARAVIRT_XXL */ 147 148 /* Irq HLT ops. */ 149 .irq.safe_halt = pv_native_safe_halt, 150 .irq.halt = native_halt, 151 152 /* Mmu ops. */ 153 .mmu.flush_tlb_user = native_flush_tlb_local, 154 .mmu.flush_tlb_kernel = native_flush_tlb_global, 155 .mmu.flush_tlb_one_user = native_flush_tlb_one_user, 156 .mmu.flush_tlb_multi = native_flush_tlb_multi, 157 158 .mmu.exit_mmap = paravirt_nop, 159 .mmu.notify_page_enc_status_changed = paravirt_nop, 160 161 #ifdef CONFIG_PARAVIRT_XXL 162 .mmu.read_cr2 = __PV_IS_CALLEE_SAVE(pv_native_read_cr2), 163 .mmu.write_cr2 = pv_native_write_cr2, 164 .mmu.read_cr3 = pv_native_read_cr3, 165 .mmu.write_cr3 = pv_native_write_cr3, 166 167 .mmu.pgd_alloc = __paravirt_pgd_alloc, 168 .mmu.pgd_free = paravirt_nop, 169 170 .mmu.alloc_pte = paravirt_nop, 171 .mmu.alloc_pmd = paravirt_nop, 172 .mmu.alloc_pud = paravirt_nop, 173 .mmu.alloc_p4d = paravirt_nop, 174 .mmu.release_pte = paravirt_nop, 175 .mmu.release_pmd = paravirt_nop, 176 .mmu.release_pud = paravirt_nop, 177 .mmu.release_p4d = paravirt_nop, 178 179 .mmu.set_pte = native_set_pte, 180 .mmu.set_pmd = native_set_pmd, 181 182 .mmu.ptep_modify_prot_start = __ptep_modify_prot_start, 183 .mmu.ptep_modify_prot_commit = __ptep_modify_prot_commit, 184 185 .mmu.set_pud = native_set_pud, 186 187 .mmu.pmd_val = PTE_IDENT, 188 .mmu.make_pmd = PTE_IDENT, 189 190 .mmu.pud_val = PTE_IDENT, 191 .mmu.make_pud = PTE_IDENT, 192 193 .mmu.set_p4d = native_set_p4d, 194 195 .mmu.p4d_val = PTE_IDENT, 196 .mmu.make_p4d = PTE_IDENT, 197 198 .mmu.set_pgd = native_set_pgd, 199 200 .mmu.pte_val = PTE_IDENT, 201 .mmu.pgd_val = PTE_IDENT, 202 203 .mmu.make_pte = PTE_IDENT, 204 .mmu.make_pgd = PTE_IDENT, 205 206 .mmu.enter_mmap = paravirt_nop, 207 208 .mmu.lazy_mode_flush = paravirt_nop, 209 210 .mmu.set_fixmap = native_set_fixmap, 211 #endif /* CONFIG_PARAVIRT_XXL */ 212 }; 213 214 #ifdef CONFIG_PARAVIRT_XXL 215 NOKPROBE_SYMBOL(native_load_idt); 216 #endif 217 218 EXPORT_SYMBOL(pv_ops); 219 EXPORT_SYMBOL_GPL(pv_info); 220