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307 lines
6.7 KiB
307 lines
6.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* Copyright IBM Corp. 2007 |
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* Copyright 2011 Freescale Semiconductor, Inc. |
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* |
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* Authors: Hollis Blanchard <[email protected]> |
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*/ |
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#include <linux/jiffies.h> |
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#include <linux/hrtimer.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/kvm_host.h> |
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#include <linux/clockchips.h> |
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#include <asm/reg.h> |
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#include <asm/time.h> |
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#include <asm/byteorder.h> |
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#include <asm/kvm_ppc.h> |
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#include <asm/disassemble.h> |
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#include <asm/ppc-opcode.h> |
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#include "timing.h" |
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#include "trace.h" |
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void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) |
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{ |
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unsigned long dec_nsec; |
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unsigned long long dec_time; |
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pr_debug("mtDEC: %lx\n", vcpu->arch.dec); |
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hrtimer_try_to_cancel(&vcpu->arch.dec_timer); |
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#ifdef CONFIG_PPC_BOOK3S |
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/* mtdec lowers the interrupt line when positive. */ |
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kvmppc_core_dequeue_dec(vcpu); |
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#endif |
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#ifdef CONFIG_BOOKE |
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/* On BOOKE, DEC = 0 is as good as decrementer not enabled */ |
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if (vcpu->arch.dec == 0) |
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return; |
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#endif |
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/* |
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* The decrementer ticks at the same rate as the timebase, so |
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* that's how we convert the guest DEC value to the number of |
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* host ticks. |
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*/ |
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dec_time = vcpu->arch.dec; |
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/* |
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* Guest timebase ticks at the same frequency as host timebase. |
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* So use the host timebase calculations for decrementer emulation. |
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*/ |
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dec_time = tb_to_ns(dec_time); |
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dec_nsec = do_div(dec_time, NSEC_PER_SEC); |
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hrtimer_start(&vcpu->arch.dec_timer, |
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ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL); |
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vcpu->arch.dec_jiffies = get_tb(); |
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} |
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u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb) |
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{ |
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u64 jd = tb - vcpu->arch.dec_jiffies; |
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#ifdef CONFIG_BOOKE |
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if (vcpu->arch.dec < jd) |
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return 0; |
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#endif |
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return vcpu->arch.dec - jd; |
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} |
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static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) |
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{ |
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enum emulation_result emulated = EMULATE_DONE; |
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ulong spr_val = kvmppc_get_gpr(vcpu, rs); |
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switch (sprn) { |
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case SPRN_SRR0: |
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kvmppc_set_srr0(vcpu, spr_val); |
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break; |
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case SPRN_SRR1: |
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kvmppc_set_srr1(vcpu, spr_val); |
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break; |
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/* XXX We need to context-switch the timebase for |
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* watchdog and FIT. */ |
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case SPRN_TBWL: break; |
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case SPRN_TBWU: break; |
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case SPRN_DEC: |
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vcpu->arch.dec = (u32) spr_val; |
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kvmppc_emulate_dec(vcpu); |
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break; |
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case SPRN_SPRG0: |
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kvmppc_set_sprg0(vcpu, spr_val); |
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break; |
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case SPRN_SPRG1: |
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kvmppc_set_sprg1(vcpu, spr_val); |
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break; |
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case SPRN_SPRG2: |
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kvmppc_set_sprg2(vcpu, spr_val); |
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break; |
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case SPRN_SPRG3: |
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kvmppc_set_sprg3(vcpu, spr_val); |
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break; |
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/* PIR can legally be written, but we ignore it */ |
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case SPRN_PIR: break; |
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default: |
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emulated = vcpu->kvm->arch.kvm_ops->emulate_mtspr(vcpu, sprn, |
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spr_val); |
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if (emulated == EMULATE_FAIL) |
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printk(KERN_INFO "mtspr: unknown spr " |
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"0x%x\n", sprn); |
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break; |
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} |
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kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS); |
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return emulated; |
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} |
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static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) |
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{ |
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enum emulation_result emulated = EMULATE_DONE; |
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ulong spr_val = 0; |
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switch (sprn) { |
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case SPRN_SRR0: |
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spr_val = kvmppc_get_srr0(vcpu); |
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break; |
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case SPRN_SRR1: |
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spr_val = kvmppc_get_srr1(vcpu); |
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break; |
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case SPRN_PVR: |
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spr_val = vcpu->arch.pvr; |
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break; |
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case SPRN_PIR: |
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spr_val = vcpu->vcpu_id; |
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break; |
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/* Note: mftb and TBRL/TBWL are user-accessible, so |
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* the guest can always access the real TB anyways. |
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* In fact, we probably will never see these traps. */ |
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case SPRN_TBWL: |
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spr_val = get_tb() >> 32; |
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break; |
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case SPRN_TBWU: |
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spr_val = get_tb(); |
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break; |
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case SPRN_SPRG0: |
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spr_val = kvmppc_get_sprg0(vcpu); |
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break; |
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case SPRN_SPRG1: |
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spr_val = kvmppc_get_sprg1(vcpu); |
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break; |
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case SPRN_SPRG2: |
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spr_val = kvmppc_get_sprg2(vcpu); |
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break; |
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case SPRN_SPRG3: |
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spr_val = kvmppc_get_sprg3(vcpu); |
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break; |
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/* Note: SPRG4-7 are user-readable, so we don't get |
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* a trap. */ |
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case SPRN_DEC: |
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spr_val = kvmppc_get_dec(vcpu, get_tb()); |
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break; |
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default: |
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emulated = vcpu->kvm->arch.kvm_ops->emulate_mfspr(vcpu, sprn, |
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&spr_val); |
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if (unlikely(emulated == EMULATE_FAIL)) { |
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printk(KERN_INFO "mfspr: unknown spr " |
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"0x%x\n", sprn); |
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} |
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break; |
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} |
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if (emulated == EMULATE_DONE) |
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kvmppc_set_gpr(vcpu, rt, spr_val); |
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kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS); |
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return emulated; |
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} |
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/* XXX Should probably auto-generate instruction decoding for a particular core |
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* from opcode tables in the future. */ |
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int kvmppc_emulate_instruction(struct kvm_vcpu *vcpu) |
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{ |
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u32 inst; |
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int rs, rt, sprn; |
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enum emulation_result emulated; |
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int advance = 1; |
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/* this default type might be overwritten by subcategories */ |
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kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS); |
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emulated = kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst); |
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if (emulated != EMULATE_DONE) |
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return emulated; |
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pr_debug("Emulating opcode %d / %d\n", get_op(inst), get_xop(inst)); |
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rs = get_rs(inst); |
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rt = get_rt(inst); |
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sprn = get_sprn(inst); |
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switch (get_op(inst)) { |
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case OP_TRAP: |
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#ifdef CONFIG_PPC_BOOK3S |
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case OP_TRAP_64: |
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kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP); |
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#else |
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kvmppc_core_queue_program(vcpu, |
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vcpu->arch.shared->esr | ESR_PTR); |
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#endif |
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advance = 0; |
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break; |
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case 31: |
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switch (get_xop(inst)) { |
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case OP_31_XOP_TRAP: |
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#ifdef CONFIG_64BIT |
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case OP_31_XOP_TRAP_64: |
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#endif |
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#ifdef CONFIG_PPC_BOOK3S |
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kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP); |
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#else |
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kvmppc_core_queue_program(vcpu, |
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vcpu->arch.shared->esr | ESR_PTR); |
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#endif |
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advance = 0; |
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break; |
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case OP_31_XOP_MFSPR: |
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emulated = kvmppc_emulate_mfspr(vcpu, sprn, rt); |
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if (emulated == EMULATE_AGAIN) { |
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emulated = EMULATE_DONE; |
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advance = 0; |
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} |
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break; |
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case OP_31_XOP_MTSPR: |
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emulated = kvmppc_emulate_mtspr(vcpu, sprn, rs); |
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if (emulated == EMULATE_AGAIN) { |
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emulated = EMULATE_DONE; |
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advance = 0; |
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} |
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break; |
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case OP_31_XOP_TLBSYNC: |
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break; |
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default: |
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/* Attempt core-specific emulation below. */ |
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emulated = EMULATE_FAIL; |
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} |
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break; |
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case 0: |
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/* |
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* Instruction with primary opcode 0. Based on PowerISA |
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* these are illegal instructions. |
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*/ |
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if (inst == KVMPPC_INST_SW_BREAKPOINT) { |
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vcpu->run->exit_reason = KVM_EXIT_DEBUG; |
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vcpu->run->debug.arch.status = 0; |
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vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu); |
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emulated = EMULATE_EXIT_USER; |
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advance = 0; |
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} else |
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emulated = EMULATE_FAIL; |
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break; |
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default: |
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emulated = EMULATE_FAIL; |
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} |
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if (emulated == EMULATE_FAIL) { |
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emulated = vcpu->kvm->arch.kvm_ops->emulate_op(vcpu, inst, |
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&advance); |
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if (emulated == EMULATE_AGAIN) { |
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advance = 0; |
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} else if (emulated == EMULATE_FAIL) { |
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advance = 0; |
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printk(KERN_ERR "Couldn't emulate instruction 0x%08x " |
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"(op %d xop %d)\n", inst, get_op(inst), get_xop(inst)); |
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} |
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} |
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trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated); |
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/* Advance past emulated instruction. */ |
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if (advance) |
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kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); |
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return emulated; |
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} |
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EXPORT_SYMBOL_GPL(kvmppc_emulate_instruction);
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