| /* |
| * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved. |
| * Copyright 2010-2011 Freescale Semiconductor, Inc. |
| * |
| * Authors: |
| * Alexander Graf <agraf@suse.de> |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| */ |
| |
| #include <linux/kvm_host.h> |
| #include <linux/init.h> |
| #include <linux/export.h> |
| #include <linux/kmemleak.h> |
| #include <linux/kvm_para.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/pagemap.h> |
| |
| #include <asm/reg.h> |
| #include <asm/sections.h> |
| #include <asm/cacheflush.h> |
| #include <asm/disassemble.h> |
| #include <asm/ppc-opcode.h> |
| #include <asm/epapr_hcalls.h> |
| |
| #define KVM_MAGIC_PAGE (-4096L) |
| #define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x) |
| |
| #define KVM_INST_LWZ 0x80000000 |
| #define KVM_INST_STW 0x90000000 |
| #define KVM_INST_LD 0xe8000000 |
| #define KVM_INST_STD 0xf8000000 |
| #define KVM_INST_NOP 0x60000000 |
| #define KVM_INST_B 0x48000000 |
| #define KVM_INST_B_MASK 0x03ffffff |
| #define KVM_INST_B_MAX 0x01ffffff |
| #define KVM_INST_LI 0x38000000 |
| |
| #define KVM_MASK_RT 0x03e00000 |
| #define KVM_RT_30 0x03c00000 |
| #define KVM_MASK_RB 0x0000f800 |
| #define KVM_INST_MFMSR 0x7c0000a6 |
| |
| #define SPR_FROM 0 |
| #define SPR_TO 0x100 |
| |
| #define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \ |
| (((sprn) & 0x1f) << 16) | \ |
| (((sprn) & 0x3e0) << 6) | \ |
| (moveto)) |
| |
| #define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM) |
| #define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO) |
| |
| #define KVM_INST_TLBSYNC 0x7c00046c |
| #define KVM_INST_MTMSRD_L0 0x7c000164 |
| #define KVM_INST_MTMSRD_L1 0x7c010164 |
| #define KVM_INST_MTMSR 0x7c000124 |
| |
| #define KVM_INST_WRTEE 0x7c000106 |
| #define KVM_INST_WRTEEI_0 0x7c000146 |
| #define KVM_INST_WRTEEI_1 0x7c008146 |
| |
| #define KVM_INST_MTSRIN 0x7c0001e4 |
| |
| static bool kvm_patching_worked = true; |
| char kvm_tmp[1024 * 1024]; |
| static int kvm_tmp_index; |
| |
| static inline void kvm_patch_ins(u32 *inst, u32 new_inst) |
| { |
| *inst = new_inst; |
| flush_icache_range((ulong)inst, (ulong)inst + 4); |
| } |
| |
| static void kvm_patch_ins_ll(u32 *inst, long addr, u32 rt) |
| { |
| #ifdef CONFIG_64BIT |
| kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); |
| #else |
| kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000fffc)); |
| #endif |
| } |
| |
| static void kvm_patch_ins_ld(u32 *inst, long addr, u32 rt) |
| { |
| #ifdef CONFIG_64BIT |
| kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); |
| #else |
| kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc)); |
| #endif |
| } |
| |
| static void kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt) |
| { |
| kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff)); |
| } |
| |
| static void kvm_patch_ins_std(u32 *inst, long addr, u32 rt) |
| { |
| #ifdef CONFIG_64BIT |
| kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc)); |
| #else |
| kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc)); |
| #endif |
| } |
| |
| static void kvm_patch_ins_stw(u32 *inst, long addr, u32 rt) |
| { |
| kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc)); |
| } |
| |
| static void kvm_patch_ins_nop(u32 *inst) |
| { |
| kvm_patch_ins(inst, KVM_INST_NOP); |
| } |
| |
| static void kvm_patch_ins_b(u32 *inst, int addr) |
| { |
| #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC_BOOK3S) |
| /* On relocatable kernels interrupts handlers and our code |
| can be in different regions, so we don't patch them */ |
| |
| if ((ulong)inst < (ulong)&__end_interrupts) |
| return; |
| #endif |
| |
| kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK)); |
| } |
| |
| static u32 *kvm_alloc(int len) |
| { |
| u32 *p; |
| |
| if ((kvm_tmp_index + len) > ARRAY_SIZE(kvm_tmp)) { |
| printk(KERN_ERR "KVM: No more space (%d + %d)\n", |
| kvm_tmp_index, len); |
| kvm_patching_worked = false; |
| return NULL; |
| } |
| |
| p = (void*)&kvm_tmp[kvm_tmp_index]; |
| kvm_tmp_index += len; |
| |
| return p; |
| } |
| |
| extern u32 kvm_emulate_mtmsrd_branch_offs; |
| extern u32 kvm_emulate_mtmsrd_reg_offs; |
| extern u32 kvm_emulate_mtmsrd_orig_ins_offs; |
| extern u32 kvm_emulate_mtmsrd_len; |
| extern u32 kvm_emulate_mtmsrd[]; |
| |
| static void kvm_patch_ins_mtmsrd(u32 *inst, u32 rt) |
| { |
| u32 *p; |
| int distance_start; |
| int distance_end; |
| ulong next_inst; |
| |
| p = kvm_alloc(kvm_emulate_mtmsrd_len * 4); |
| if (!p) |
| return; |
| |
| /* Find out where we are and put everything there */ |
| distance_start = (ulong)p - (ulong)inst; |
| next_inst = ((ulong)inst + 4); |
| distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsrd_branch_offs]; |
| |
| /* Make sure we only write valid b instructions */ |
| if (distance_start > KVM_INST_B_MAX) { |
| kvm_patching_worked = false; |
| return; |
| } |
| |
| /* Modify the chunk to fit the invocation */ |
| memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4); |
| p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK; |
| switch (get_rt(rt)) { |
| case 30: |
| kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], |
| magic_var(scratch2), KVM_RT_30); |
| break; |
| case 31: |
| kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], |
| magic_var(scratch1), KVM_RT_30); |
| break; |
| default: |
| p[kvm_emulate_mtmsrd_reg_offs] |= rt; |
| break; |
| } |
| |
| p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst; |
| flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4); |
| |
| /* Patch the invocation */ |
| kvm_patch_ins_b(inst, distance_start); |
| } |
| |
| extern u32 kvm_emulate_mtmsr_branch_offs; |
| extern u32 kvm_emulate_mtmsr_reg1_offs; |
| extern u32 kvm_emulate_mtmsr_reg2_offs; |
| extern u32 kvm_emulate_mtmsr_orig_ins_offs; |
| extern u32 kvm_emulate_mtmsr_len; |
| extern u32 kvm_emulate_mtmsr[]; |
| |
| static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt) |
| { |
| u32 *p; |
| int distance_start; |
| int distance_end; |
| ulong next_inst; |
| |
| p = kvm_alloc(kvm_emulate_mtmsr_len * 4); |
| if (!p) |
| return; |
| |
| /* Find out where we are and put everything there */ |
| distance_start = (ulong)p - (ulong)inst; |
| next_inst = ((ulong)inst + 4); |
| distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsr_branch_offs]; |
| |
| /* Make sure we only write valid b instructions */ |
| if (distance_start > KVM_INST_B_MAX) { |
| kvm_patching_worked = false; |
| return; |
| } |
| |
| /* Modify the chunk to fit the invocation */ |
| memcpy(p, kvm_emulate_mtmsr, kvm_emulate_mtmsr_len * 4); |
| p[kvm_emulate_mtmsr_branch_offs] |= distance_end & KVM_INST_B_MASK; |
| |
| /* Make clobbered registers work too */ |
| switch (get_rt(rt)) { |
| case 30: |
| kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], |
| magic_var(scratch2), KVM_RT_30); |
| kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], |
| magic_var(scratch2), KVM_RT_30); |
| break; |
| case 31: |
| kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], |
| magic_var(scratch1), KVM_RT_30); |
| kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], |
| magic_var(scratch1), KVM_RT_30); |
| break; |
| default: |
| p[kvm_emulate_mtmsr_reg1_offs] |= rt; |
| p[kvm_emulate_mtmsr_reg2_offs] |= rt; |
| break; |
| } |
| |
| p[kvm_emulate_mtmsr_orig_ins_offs] = *inst; |
| flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4); |
| |
| /* Patch the invocation */ |
| kvm_patch_ins_b(inst, distance_start); |
| } |
| |
| #ifdef CONFIG_BOOKE |
| |
| extern u32 kvm_emulate_wrtee_branch_offs; |
| extern u32 kvm_emulate_wrtee_reg_offs; |
| extern u32 kvm_emulate_wrtee_orig_ins_offs; |
| extern u32 kvm_emulate_wrtee_len; |
| extern u32 kvm_emulate_wrtee[]; |
| |
| static void kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one) |
| { |
| u32 *p; |
| int distance_start; |
| int distance_end; |
| ulong next_inst; |
| |
| p = kvm_alloc(kvm_emulate_wrtee_len * 4); |
| if (!p) |
| return; |
| |
| /* Find out where we are and put everything there */ |
| distance_start = (ulong)p - (ulong)inst; |
| next_inst = ((ulong)inst + 4); |
| distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs]; |
| |
| /* Make sure we only write valid b instructions */ |
| if (distance_start > KVM_INST_B_MAX) { |
| kvm_patching_worked = false; |
| return; |
| } |
| |
| /* Modify the chunk to fit the invocation */ |
| memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4); |
| p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK; |
| |
| if (imm_one) { |
| p[kvm_emulate_wrtee_reg_offs] = |
| KVM_INST_LI | __PPC_RT(R30) | MSR_EE; |
| } else { |
| /* Make clobbered registers work too */ |
| switch (get_rt(rt)) { |
| case 30: |
| kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], |
| magic_var(scratch2), KVM_RT_30); |
| break; |
| case 31: |
| kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], |
| magic_var(scratch1), KVM_RT_30); |
| break; |
| default: |
| p[kvm_emulate_wrtee_reg_offs] |= rt; |
| break; |
| } |
| } |
| |
| p[kvm_emulate_wrtee_orig_ins_offs] = *inst; |
| flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4); |
| |
| /* Patch the invocation */ |
| kvm_patch_ins_b(inst, distance_start); |
| } |
| |
| extern u32 kvm_emulate_wrteei_0_branch_offs; |
| extern u32 kvm_emulate_wrteei_0_len; |
| extern u32 kvm_emulate_wrteei_0[]; |
| |
| static void kvm_patch_ins_wrteei_0(u32 *inst) |
| { |
| u32 *p; |
| int distance_start; |
| int distance_end; |
| ulong next_inst; |
| |
| p = kvm_alloc(kvm_emulate_wrteei_0_len * 4); |
| if (!p) |
| return; |
| |
| /* Find out where we are and put everything there */ |
| distance_start = (ulong)p - (ulong)inst; |
| next_inst = ((ulong)inst + 4); |
| distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_0_branch_offs]; |
| |
| /* Make sure we only write valid b instructions */ |
| if (distance_start > KVM_INST_B_MAX) { |
| kvm_patching_worked = false; |
| return; |
| } |
| |
| memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4); |
| p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK; |
| flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4); |
| |
| /* Patch the invocation */ |
| kvm_patch_ins_b(inst, distance_start); |
| } |
| |
| #endif |
| |
| #ifdef CONFIG_PPC_BOOK3S_32 |
| |
| extern u32 kvm_emulate_mtsrin_branch_offs; |
| extern u32 kvm_emulate_mtsrin_reg1_offs; |
| extern u32 kvm_emulate_mtsrin_reg2_offs; |
| extern u32 kvm_emulate_mtsrin_orig_ins_offs; |
| extern u32 kvm_emulate_mtsrin_len; |
| extern u32 kvm_emulate_mtsrin[]; |
| |
| static void kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb) |
| { |
| u32 *p; |
| int distance_start; |
| int distance_end; |
| ulong next_inst; |
| |
| p = kvm_alloc(kvm_emulate_mtsrin_len * 4); |
| if (!p) |
| return; |
| |
| /* Find out where we are and put everything there */ |
| distance_start = (ulong)p - (ulong)inst; |
| next_inst = ((ulong)inst + 4); |
| distance_end = next_inst - (ulong)&p[kvm_emulate_mtsrin_branch_offs]; |
| |
| /* Make sure we only write valid b instructions */ |
| if (distance_start > KVM_INST_B_MAX) { |
| kvm_patching_worked = false; |
| return; |
| } |
| |
| /* Modify the chunk to fit the invocation */ |
| memcpy(p, kvm_emulate_mtsrin, kvm_emulate_mtsrin_len * 4); |
| p[kvm_emulate_mtsrin_branch_offs] |= distance_end & KVM_INST_B_MASK; |
| p[kvm_emulate_mtsrin_reg1_offs] |= (rb << 10); |
| p[kvm_emulate_mtsrin_reg2_offs] |= rt; |
| p[kvm_emulate_mtsrin_orig_ins_offs] = *inst; |
| flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtsrin_len * 4); |
| |
| /* Patch the invocation */ |
| kvm_patch_ins_b(inst, distance_start); |
| } |
| |
| #endif |
| |
| static void kvm_map_magic_page(void *data) |
| { |
| u32 *features = data; |
| |
| ulong in[8] = {0}; |
| ulong out[8]; |
| |
| in[0] = KVM_MAGIC_PAGE; |
| in[1] = KVM_MAGIC_PAGE | MAGIC_PAGE_FLAG_NOT_MAPPED_NX; |
| |
| epapr_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE)); |
| |
| *features = out[0]; |
| } |
| |
| static void kvm_check_ins(u32 *inst, u32 features) |
| { |
| u32 _inst = *inst; |
| u32 inst_no_rt = _inst & ~KVM_MASK_RT; |
| u32 inst_rt = _inst & KVM_MASK_RT; |
| |
| switch (inst_no_rt) { |
| /* Loads */ |
| case KVM_INST_MFMSR: |
| kvm_patch_ins_ld(inst, magic_var(msr), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SPRG0): |
| kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SPRG1): |
| kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SPRG2): |
| kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SPRG3): |
| kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SRR0): |
| kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SRR1): |
| kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt); |
| break; |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MFSPR(SPRN_DEAR): |
| #else |
| case KVM_INST_MFSPR(SPRN_DAR): |
| #endif |
| kvm_patch_ins_ld(inst, magic_var(dar), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_DSISR): |
| kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt); |
| break; |
| |
| #ifdef CONFIG_PPC_BOOK3E_MMU |
| case KVM_INST_MFSPR(SPRN_MAS0): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_MAS1): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_MAS2): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_MAS3): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_MAS4): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_MAS6): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_MAS7): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt); |
| break; |
| #endif /* CONFIG_PPC_BOOK3E_MMU */ |
| |
| case KVM_INST_MFSPR(SPRN_SPRG4): |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MFSPR(SPRN_SPRG4R): |
| #endif |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SPRG5): |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MFSPR(SPRN_SPRG5R): |
| #endif |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SPRG6): |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MFSPR(SPRN_SPRG6R): |
| #endif |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt); |
| break; |
| case KVM_INST_MFSPR(SPRN_SPRG7): |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MFSPR(SPRN_SPRG7R): |
| #endif |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt); |
| break; |
| |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MFSPR(SPRN_ESR): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(esr), inst_rt); |
| break; |
| #endif |
| |
| case KVM_INST_MFSPR(SPRN_PIR): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_lwz(inst, magic_var(pir), inst_rt); |
| break; |
| |
| |
| /* Stores */ |
| case KVM_INST_MTSPR(SPRN_SPRG0): |
| kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SPRG1): |
| kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SPRG2): |
| kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SPRG3): |
| kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SRR0): |
| kvm_patch_ins_std(inst, magic_var(srr0), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SRR1): |
| kvm_patch_ins_std(inst, magic_var(srr1), inst_rt); |
| break; |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MTSPR(SPRN_DEAR): |
| #else |
| case KVM_INST_MTSPR(SPRN_DAR): |
| #endif |
| kvm_patch_ins_std(inst, magic_var(dar), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_DSISR): |
| kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt); |
| break; |
| #ifdef CONFIG_PPC_BOOK3E_MMU |
| case KVM_INST_MTSPR(SPRN_MAS0): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_stw(inst, magic_var(mas0), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_MAS1): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_stw(inst, magic_var(mas1), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_MAS2): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_std(inst, magic_var(mas2), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_MAS3): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_stw(inst, magic_var(mas7_3) + 4, inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_MAS4): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_stw(inst, magic_var(mas4), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_MAS6): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_stw(inst, magic_var(mas6), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_MAS7): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_stw(inst, magic_var(mas7_3), inst_rt); |
| break; |
| #endif /* CONFIG_PPC_BOOK3E_MMU */ |
| |
| case KVM_INST_MTSPR(SPRN_SPRG4): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_std(inst, magic_var(sprg4), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SPRG5): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_std(inst, magic_var(sprg5), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SPRG6): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_std(inst, magic_var(sprg6), inst_rt); |
| break; |
| case KVM_INST_MTSPR(SPRN_SPRG7): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_std(inst, magic_var(sprg7), inst_rt); |
| break; |
| |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_MTSPR(SPRN_ESR): |
| if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
| kvm_patch_ins_stw(inst, magic_var(esr), inst_rt); |
| break; |
| #endif |
| |
| /* Nops */ |
| case KVM_INST_TLBSYNC: |
| kvm_patch_ins_nop(inst); |
| break; |
| |
| /* Rewrites */ |
| case KVM_INST_MTMSRD_L1: |
| kvm_patch_ins_mtmsrd(inst, inst_rt); |
| break; |
| case KVM_INST_MTMSR: |
| case KVM_INST_MTMSRD_L0: |
| kvm_patch_ins_mtmsr(inst, inst_rt); |
| break; |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_WRTEE: |
| kvm_patch_ins_wrtee(inst, inst_rt, 0); |
| break; |
| #endif |
| } |
| |
| switch (inst_no_rt & ~KVM_MASK_RB) { |
| #ifdef CONFIG_PPC_BOOK3S_32 |
| case KVM_INST_MTSRIN: |
| if (features & KVM_MAGIC_FEAT_SR) { |
| u32 inst_rb = _inst & KVM_MASK_RB; |
| kvm_patch_ins_mtsrin(inst, inst_rt, inst_rb); |
| } |
| break; |
| #endif |
| } |
| |
| switch (_inst) { |
| #ifdef CONFIG_BOOKE |
| case KVM_INST_WRTEEI_0: |
| kvm_patch_ins_wrteei_0(inst); |
| break; |
| |
| case KVM_INST_WRTEEI_1: |
| kvm_patch_ins_wrtee(inst, 0, 1); |
| break; |
| #endif |
| } |
| } |
| |
| extern u32 kvm_template_start[]; |
| extern u32 kvm_template_end[]; |
| |
| static void kvm_use_magic_page(void) |
| { |
| u32 *p; |
| u32 *start, *end; |
| u32 features; |
| |
| /* Tell the host to map the magic page to -4096 on all CPUs */ |
| on_each_cpu(kvm_map_magic_page, &features, 1); |
| |
| /* Quick self-test to see if the mapping works */ |
| if (!fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) { |
| kvm_patching_worked = false; |
| return; |
| } |
| |
| /* Now loop through all code and find instructions */ |
| start = (void*)_stext; |
| end = (void*)_etext; |
| |
| /* |
| * Being interrupted in the middle of patching would |
| * be bad for SPRG4-7, which KVM can't keep in sync |
| * with emulated accesses because reads don't trap. |
| */ |
| local_irq_disable(); |
| |
| for (p = start; p < end; p++) { |
| /* Avoid patching the template code */ |
| if (p >= kvm_template_start && p < kvm_template_end) { |
| p = kvm_template_end - 1; |
| continue; |
| } |
| kvm_check_ins(p, features); |
| } |
| |
| local_irq_enable(); |
| |
| printk(KERN_INFO "KVM: Live patching for a fast VM %s\n", |
| kvm_patching_worked ? "worked" : "failed"); |
| } |
| |
| static __init void kvm_free_tmp(void) |
| { |
| /* |
| * Inform kmemleak about the hole in the .bss section since the |
| * corresponding pages will be unmapped with DEBUG_PAGEALLOC=y. |
| */ |
| kmemleak_free_part(&kvm_tmp[kvm_tmp_index], |
| ARRAY_SIZE(kvm_tmp) - kvm_tmp_index); |
| free_reserved_area(&kvm_tmp[kvm_tmp_index], |
| &kvm_tmp[ARRAY_SIZE(kvm_tmp)], -1, NULL); |
| } |
| |
| static int __init kvm_guest_init(void) |
| { |
| if (!kvm_para_available()) |
| goto free_tmp; |
| |
| if (!epapr_paravirt_enabled) |
| goto free_tmp; |
| |
| if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE)) |
| kvm_use_magic_page(); |
| |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| /* Enable napping */ |
| powersave_nap = 1; |
| #endif |
| |
| free_tmp: |
| kvm_free_tmp(); |
| |
| return 0; |
| } |
| |
| postcore_initcall(kvm_guest_init); |
