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722 lines
19 KiB
722 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved. |
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* Copyright 2010-2011 Freescale Semiconductor, Inc. |
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* |
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* Authors: |
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* Alexander Graf <[email protected]> |
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*/ |
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#include <linux/kvm_host.h> |
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#include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/kmemleak.h> |
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#include <linux/kvm_para.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/pagemap.h> |
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#include <asm/reg.h> |
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#include <asm/sections.h> |
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#include <asm/cacheflush.h> |
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#include <asm/disassemble.h> |
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#include <asm/ppc-opcode.h> |
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#include <asm/epapr_hcalls.h> |
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#define KVM_MAGIC_PAGE (-4096L) |
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#define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x) |
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#define KVM_INST_LWZ 0x80000000 |
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#define KVM_INST_STW 0x90000000 |
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#define KVM_INST_LD 0xe8000000 |
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#define KVM_INST_STD 0xf8000000 |
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#define KVM_INST_NOP 0x60000000 |
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#define KVM_INST_B 0x48000000 |
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#define KVM_INST_B_MASK 0x03ffffff |
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#define KVM_INST_B_MAX 0x01ffffff |
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#define KVM_INST_LI 0x38000000 |
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#define KVM_MASK_RT 0x03e00000 |
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#define KVM_RT_30 0x03c00000 |
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#define KVM_MASK_RB 0x0000f800 |
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#define KVM_INST_MFMSR 0x7c0000a6 |
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#define SPR_FROM 0 |
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#define SPR_TO 0x100 |
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#define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \ |
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(((sprn) & 0x1f) << 16) | \ |
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(((sprn) & 0x3e0) << 6) | \ |
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(moveto)) |
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#define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM) |
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#define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO) |
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#define KVM_INST_TLBSYNC 0x7c00046c |
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#define KVM_INST_MTMSRD_L0 0x7c000164 |
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#define KVM_INST_MTMSRD_L1 0x7c010164 |
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#define KVM_INST_MTMSR 0x7c000124 |
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#define KVM_INST_WRTEE 0x7c000106 |
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#define KVM_INST_WRTEEI_0 0x7c000146 |
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#define KVM_INST_WRTEEI_1 0x7c008146 |
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#define KVM_INST_MTSRIN 0x7c0001e4 |
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static bool kvm_patching_worked = true; |
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extern char kvm_tmp[]; |
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extern char kvm_tmp_end[]; |
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static int kvm_tmp_index; |
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static void __init kvm_patch_ins(u32 *inst, u32 new_inst) |
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{ |
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*inst = new_inst; |
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flush_icache_range((ulong)inst, (ulong)inst + 4); |
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} |
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static void __init kvm_patch_ins_ll(u32 *inst, long addr, u32 rt) |
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{ |
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#ifdef CONFIG_64BIT |
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kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); |
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#else |
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kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000fffc)); |
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#endif |
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} |
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static void __init kvm_patch_ins_ld(u32 *inst, long addr, u32 rt) |
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{ |
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#ifdef CONFIG_64BIT |
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kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); |
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#else |
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kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc)); |
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#endif |
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} |
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static void __init kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt) |
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{ |
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kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff)); |
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} |
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static void __init kvm_patch_ins_std(u32 *inst, long addr, u32 rt) |
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{ |
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#ifdef CONFIG_64BIT |
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kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc)); |
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#else |
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kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc)); |
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#endif |
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} |
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static void __init kvm_patch_ins_stw(u32 *inst, long addr, u32 rt) |
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{ |
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kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc)); |
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} |
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static void __init kvm_patch_ins_nop(u32 *inst) |
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{ |
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kvm_patch_ins(inst, KVM_INST_NOP); |
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} |
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static void __init kvm_patch_ins_b(u32 *inst, int addr) |
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{ |
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#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC_BOOK3S) |
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/* On relocatable kernels interrupts handlers and our code |
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can be in different regions, so we don't patch them */ |
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if ((ulong)inst < (ulong)&__end_interrupts) |
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return; |
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#endif |
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kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK)); |
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} |
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static u32 * __init kvm_alloc(int len) |
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{ |
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u32 *p; |
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if ((kvm_tmp_index + len) > (kvm_tmp_end - kvm_tmp)) { |
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printk(KERN_ERR "KVM: No more space (%d + %d)\n", |
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kvm_tmp_index, len); |
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kvm_patching_worked = false; |
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return NULL; |
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} |
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p = (void*)&kvm_tmp[kvm_tmp_index]; |
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kvm_tmp_index += len; |
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return p; |
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} |
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extern u32 kvm_emulate_mtmsrd_branch_offs; |
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extern u32 kvm_emulate_mtmsrd_reg_offs; |
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extern u32 kvm_emulate_mtmsrd_orig_ins_offs; |
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extern u32 kvm_emulate_mtmsrd_len; |
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extern u32 kvm_emulate_mtmsrd[]; |
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static void __init kvm_patch_ins_mtmsrd(u32 *inst, u32 rt) |
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{ |
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u32 *p; |
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int distance_start; |
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int distance_end; |
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ulong next_inst; |
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p = kvm_alloc(kvm_emulate_mtmsrd_len * 4); |
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if (!p) |
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return; |
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/* Find out where we are and put everything there */ |
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distance_start = (ulong)p - (ulong)inst; |
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next_inst = ((ulong)inst + 4); |
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distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsrd_branch_offs]; |
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/* Make sure we only write valid b instructions */ |
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if (distance_start > KVM_INST_B_MAX) { |
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kvm_patching_worked = false; |
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return; |
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} |
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/* Modify the chunk to fit the invocation */ |
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memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4); |
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p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK; |
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switch (get_rt(rt)) { |
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case 30: |
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kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], |
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magic_var(scratch2), KVM_RT_30); |
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break; |
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case 31: |
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kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], |
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magic_var(scratch1), KVM_RT_30); |
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break; |
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default: |
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p[kvm_emulate_mtmsrd_reg_offs] |= rt; |
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break; |
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} |
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p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst; |
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flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4); |
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/* Patch the invocation */ |
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kvm_patch_ins_b(inst, distance_start); |
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} |
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extern u32 kvm_emulate_mtmsr_branch_offs; |
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extern u32 kvm_emulate_mtmsr_reg1_offs; |
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extern u32 kvm_emulate_mtmsr_reg2_offs; |
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extern u32 kvm_emulate_mtmsr_orig_ins_offs; |
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extern u32 kvm_emulate_mtmsr_len; |
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extern u32 kvm_emulate_mtmsr[]; |
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static void __init kvm_patch_ins_mtmsr(u32 *inst, u32 rt) |
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{ |
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u32 *p; |
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int distance_start; |
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int distance_end; |
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ulong next_inst; |
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p = kvm_alloc(kvm_emulate_mtmsr_len * 4); |
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if (!p) |
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return; |
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/* Find out where we are and put everything there */ |
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distance_start = (ulong)p - (ulong)inst; |
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next_inst = ((ulong)inst + 4); |
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distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsr_branch_offs]; |
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/* Make sure we only write valid b instructions */ |
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if (distance_start > KVM_INST_B_MAX) { |
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kvm_patching_worked = false; |
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return; |
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} |
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/* Modify the chunk to fit the invocation */ |
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memcpy(p, kvm_emulate_mtmsr, kvm_emulate_mtmsr_len * 4); |
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p[kvm_emulate_mtmsr_branch_offs] |= distance_end & KVM_INST_B_MASK; |
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/* Make clobbered registers work too */ |
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switch (get_rt(rt)) { |
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case 30: |
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kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], |
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magic_var(scratch2), KVM_RT_30); |
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kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], |
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magic_var(scratch2), KVM_RT_30); |
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break; |
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case 31: |
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kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], |
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magic_var(scratch1), KVM_RT_30); |
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kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], |
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magic_var(scratch1), KVM_RT_30); |
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break; |
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default: |
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p[kvm_emulate_mtmsr_reg1_offs] |= rt; |
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p[kvm_emulate_mtmsr_reg2_offs] |= rt; |
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break; |
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} |
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p[kvm_emulate_mtmsr_orig_ins_offs] = *inst; |
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flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4); |
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/* Patch the invocation */ |
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kvm_patch_ins_b(inst, distance_start); |
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} |
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#ifdef CONFIG_BOOKE |
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extern u32 kvm_emulate_wrtee_branch_offs; |
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extern u32 kvm_emulate_wrtee_reg_offs; |
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extern u32 kvm_emulate_wrtee_orig_ins_offs; |
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extern u32 kvm_emulate_wrtee_len; |
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extern u32 kvm_emulate_wrtee[]; |
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static void __init kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one) |
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{ |
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u32 *p; |
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int distance_start; |
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int distance_end; |
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ulong next_inst; |
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p = kvm_alloc(kvm_emulate_wrtee_len * 4); |
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if (!p) |
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return; |
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/* Find out where we are and put everything there */ |
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distance_start = (ulong)p - (ulong)inst; |
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next_inst = ((ulong)inst + 4); |
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distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs]; |
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/* Make sure we only write valid b instructions */ |
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if (distance_start > KVM_INST_B_MAX) { |
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kvm_patching_worked = false; |
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return; |
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} |
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/* Modify the chunk to fit the invocation */ |
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memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4); |
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p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK; |
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if (imm_one) { |
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p[kvm_emulate_wrtee_reg_offs] = |
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KVM_INST_LI | __PPC_RT(R30) | MSR_EE; |
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} else { |
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/* Make clobbered registers work too */ |
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switch (get_rt(rt)) { |
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case 30: |
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kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], |
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magic_var(scratch2), KVM_RT_30); |
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break; |
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case 31: |
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kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], |
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magic_var(scratch1), KVM_RT_30); |
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break; |
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default: |
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p[kvm_emulate_wrtee_reg_offs] |= rt; |
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break; |
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} |
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} |
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p[kvm_emulate_wrtee_orig_ins_offs] = *inst; |
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flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4); |
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/* Patch the invocation */ |
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kvm_patch_ins_b(inst, distance_start); |
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} |
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extern u32 kvm_emulate_wrteei_0_branch_offs; |
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extern u32 kvm_emulate_wrteei_0_len; |
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extern u32 kvm_emulate_wrteei_0[]; |
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static void __init kvm_patch_ins_wrteei_0(u32 *inst) |
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{ |
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u32 *p; |
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int distance_start; |
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int distance_end; |
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ulong next_inst; |
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p = kvm_alloc(kvm_emulate_wrteei_0_len * 4); |
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if (!p) |
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return; |
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/* Find out where we are and put everything there */ |
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distance_start = (ulong)p - (ulong)inst; |
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next_inst = ((ulong)inst + 4); |
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distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_0_branch_offs]; |
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/* Make sure we only write valid b instructions */ |
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if (distance_start > KVM_INST_B_MAX) { |
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kvm_patching_worked = false; |
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return; |
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} |
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memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4); |
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p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK; |
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flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4); |
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/* Patch the invocation */ |
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kvm_patch_ins_b(inst, distance_start); |
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} |
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#endif |
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#ifdef CONFIG_PPC_BOOK3S_32 |
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extern u32 kvm_emulate_mtsrin_branch_offs; |
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extern u32 kvm_emulate_mtsrin_reg1_offs; |
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extern u32 kvm_emulate_mtsrin_reg2_offs; |
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extern u32 kvm_emulate_mtsrin_orig_ins_offs; |
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extern u32 kvm_emulate_mtsrin_len; |
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extern u32 kvm_emulate_mtsrin[]; |
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static void __init kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb) |
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{ |
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u32 *p; |
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int distance_start; |
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int distance_end; |
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ulong next_inst; |
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p = kvm_alloc(kvm_emulate_mtsrin_len * 4); |
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if (!p) |
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return; |
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/* Find out where we are and put everything there */ |
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distance_start = (ulong)p - (ulong)inst; |
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next_inst = ((ulong)inst + 4); |
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distance_end = next_inst - (ulong)&p[kvm_emulate_mtsrin_branch_offs]; |
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/* Make sure we only write valid b instructions */ |
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if (distance_start > KVM_INST_B_MAX) { |
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kvm_patching_worked = false; |
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return; |
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} |
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/* Modify the chunk to fit the invocation */ |
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memcpy(p, kvm_emulate_mtsrin, kvm_emulate_mtsrin_len * 4); |
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p[kvm_emulate_mtsrin_branch_offs] |= distance_end & KVM_INST_B_MASK; |
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p[kvm_emulate_mtsrin_reg1_offs] |= (rb << 10); |
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p[kvm_emulate_mtsrin_reg2_offs] |= rt; |
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p[kvm_emulate_mtsrin_orig_ins_offs] = *inst; |
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flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtsrin_len * 4); |
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/* Patch the invocation */ |
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kvm_patch_ins_b(inst, distance_start); |
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} |
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#endif |
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static void __init kvm_map_magic_page(void *data) |
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{ |
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u32 *features = data; |
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ulong in[8] = {0}; |
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ulong out[8]; |
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in[0] = KVM_MAGIC_PAGE; |
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in[1] = KVM_MAGIC_PAGE | MAGIC_PAGE_FLAG_NOT_MAPPED_NX; |
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epapr_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE)); |
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*features = out[0]; |
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} |
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static void __init kvm_check_ins(u32 *inst, u32 features) |
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{ |
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u32 _inst = *inst; |
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u32 inst_no_rt = _inst & ~KVM_MASK_RT; |
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u32 inst_rt = _inst & KVM_MASK_RT; |
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switch (inst_no_rt) { |
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/* Loads */ |
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case KVM_INST_MFMSR: |
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kvm_patch_ins_ld(inst, magic_var(msr), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_SPRG0): |
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kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_SPRG1): |
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kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_SPRG2): |
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kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_SPRG3): |
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kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_SRR0): |
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kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_SRR1): |
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kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt); |
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break; |
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#ifdef CONFIG_BOOKE |
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case KVM_INST_MFSPR(SPRN_DEAR): |
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#else |
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case KVM_INST_MFSPR(SPRN_DAR): |
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#endif |
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kvm_patch_ins_ld(inst, magic_var(dar), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_DSISR): |
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kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt); |
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break; |
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#ifdef CONFIG_PPC_BOOK3E_MMU |
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case KVM_INST_MFSPR(SPRN_MAS0): |
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if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
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kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_MAS1): |
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if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
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kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_MAS2): |
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if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
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kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_MAS3): |
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if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
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kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_MAS4): |
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if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
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kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_MAS6): |
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if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
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kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt); |
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break; |
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case KVM_INST_MFSPR(SPRN_MAS7): |
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if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) |
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kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt); |
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break; |
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#endif /* CONFIG_PPC_BOOK3E_MMU */ |
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|
|
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 __init 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 int __init kvm_guest_init(void) |
|
{ |
|
if (!kvm_para_available()) |
|
return 0; |
|
|
|
if (!epapr_paravirt_enabled) |
|
return 0; |
|
|
|
if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE)) |
|
kvm_use_magic_page(); |
|
|
|
#ifdef CONFIG_PPC_BOOK3S_64 |
|
/* Enable napping */ |
|
powersave_nap = 1; |
|
#endif |
|
|
|
return 0; |
|
} |
|
|
|
postcore_initcall(kvm_guest_init);
|
|
|