/* * 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. * * Copyright IBM Corp. 2007 * Copyright 2011 Freescale Semiconductor, Inc. * * Authors: Hollis Blanchard */ #include #include #include #include #include #include #include #include #include #include #include #include #include "timing.h" #include "trace.h" void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) { unsigned long dec_nsec; unsigned long long dec_time; pr_debug("mtDEC: %x\n", vcpu->arch.dec); hrtimer_try_to_cancel(&vcpu->arch.dec_timer); #ifdef CONFIG_PPC_BOOK3S /* mtdec lowers the interrupt line when positive. */ kvmppc_core_dequeue_dec(vcpu); /* POWER4+ triggers a dec interrupt if the value is < 0 */ if (vcpu->arch.dec & 0x80000000) { kvmppc_core_queue_dec(vcpu); return; } #endif #ifdef CONFIG_BOOKE /* On BOOKE, DEC = 0 is as good as decrementer not enabled */ if (vcpu->arch.dec == 0) return; #endif /* * The decrementer ticks at the same rate as the timebase, so * that's how we convert the guest DEC value to the number of * host ticks. */ dec_time = vcpu->arch.dec; /* * Guest timebase ticks at the same frequency as host decrementer. * So use the host decrementer calculations for decrementer emulation. */ dec_time = dec_time << decrementer_clockevent.shift; do_div(dec_time, decrementer_clockevent.mult); dec_nsec = do_div(dec_time, NSEC_PER_SEC); hrtimer_start(&vcpu->arch.dec_timer, ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL); vcpu->arch.dec_jiffies = get_tb(); } u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb) { u64 jd = tb - vcpu->arch.dec_jiffies; #ifdef CONFIG_BOOKE if (vcpu->arch.dec < jd) return 0; #endif return vcpu->arch.dec - jd; } static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) { enum emulation_result emulated = EMULATE_DONE; ulong spr_val = kvmppc_get_gpr(vcpu, rs); switch (sprn) { case SPRN_SRR0: vcpu->arch.shared->srr0 = spr_val; break; case SPRN_SRR1: vcpu->arch.shared->srr1 = spr_val; break; /* XXX We need to context-switch the timebase for * watchdog and FIT. */ case SPRN_TBWL: break; case SPRN_TBWU: break; case SPRN_DEC: vcpu->arch.dec = spr_val; kvmppc_emulate_dec(vcpu); break; case SPRN_SPRG0: vcpu->arch.shared->sprg0 = spr_val; break; case SPRN_SPRG1: vcpu->arch.shared->sprg1 = spr_val; break; case SPRN_SPRG2: vcpu->arch.shared->sprg2 = spr_val; break; case SPRN_SPRG3: vcpu->arch.shared->sprg3 = spr_val; break; default: emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, spr_val); if (emulated == EMULATE_FAIL) printk(KERN_INFO "mtspr: unknown spr " "0x%x\n", sprn); break; } kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS); return emulated; } static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) { enum emulation_result emulated = EMULATE_DONE; ulong spr_val = 0; switch (sprn) { case SPRN_SRR0: spr_val = vcpu->arch.shared->srr0; break; case SPRN_SRR1: spr_val = vcpu->arch.shared->srr1; break; case SPRN_PVR: spr_val = vcpu->arch.pvr; break; case SPRN_PIR: spr_val = vcpu->vcpu_id; break; /* Note: mftb and TBRL/TBWL are user-accessible, so * the guest can always access the real TB anyways. * In fact, we probably will never see these traps. */ case SPRN_TBWL: spr_val = get_tb() >> 32; break; case SPRN_TBWU: spr_val = get_tb(); break; case SPRN_SPRG0: spr_val = vcpu->arch.shared->sprg0; break; case SPRN_SPRG1: spr_val = vcpu->arch.shared->sprg1; break; case SPRN_SPRG2: spr_val = vcpu->arch.shared->sprg2; break; case SPRN_SPRG3: spr_val = vcpu->arch.shared->sprg3; break; /* Note: SPRG4-7 are user-readable, so we don't get * a trap. */ case SPRN_DEC: spr_val = kvmppc_get_dec(vcpu, get_tb()); break; default: emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, &spr_val); if (unlikely(emulated == EMULATE_FAIL)) { printk(KERN_INFO "mfspr: unknown spr " "0x%x\n", sprn); } break; } if (emulated == EMULATE_DONE) kvmppc_set_gpr(vcpu, rt, spr_val); kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS); return emulated; } /* XXX to do: * lhax * lhaux * lswx * lswi * stswx * stswi * lha * lhau * lmw * stmw * * XXX is_bigendian should depend on MMU mapping or MSR[LE] */ /* XXX Should probably auto-generate instruction decoding for a particular core * from opcode tables in the future. */ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) { u32 inst = kvmppc_get_last_inst(vcpu); int ra = get_ra(inst); int rs = get_rs(inst); int rt = get_rt(inst); int sprn = get_sprn(inst); enum emulation_result emulated = EMULATE_DONE; int advance = 1; /* this default type might be overwritten by subcategories */ kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS); pr_debug("Emulating opcode %d / %d\n", get_op(inst), get_xop(inst)); switch (get_op(inst)) { case OP_TRAP: #ifdef CONFIG_PPC_BOOK3S case OP_TRAP_64: kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP); #else kvmppc_core_queue_program(vcpu, vcpu->arch.shared->esr | ESR_PTR); #endif advance = 0; break; case 31: switch (get_xop(inst)) { case OP_31_XOP_TRAP: #ifdef CONFIG_64BIT case OP_31_XOP_TRAP_64: #endif #ifdef CONFIG_PPC_BOOK3S kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP); #else kvmppc_core_queue_program(vcpu, vcpu->arch.shared->esr | ESR_PTR); #endif advance = 0; break; case OP_31_XOP_LWZX: emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); break; case OP_31_XOP_LBZX: emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); break; case OP_31_XOP_LBZUX: emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_31_XOP_STWX: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 4, 1); break; case OP_31_XOP_STBX: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 1, 1); break; case OP_31_XOP_STBUX: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 1, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_31_XOP_LHAX: emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1); break; case OP_31_XOP_LHZX: emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); break; case OP_31_XOP_LHZUX: emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_31_XOP_MFSPR: emulated = kvmppc_emulate_mfspr(vcpu, sprn, rt); break; case OP_31_XOP_STHX: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 2, 1); break; case OP_31_XOP_STHUX: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 2, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_31_XOP_MTSPR: emulated = kvmppc_emulate_mtspr(vcpu, sprn, rs); break; case OP_31_XOP_DCBST: case OP_31_XOP_DCBF: case OP_31_XOP_DCBI: /* Do nothing. The guest is performing dcbi because * hardware DMA is not snooped by the dcache, but * emulated DMA either goes through the dcache as * normal writes, or the host kernel has handled dcache * coherence. */ break; case OP_31_XOP_LWBRX: emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0); break; case OP_31_XOP_TLBSYNC: break; case OP_31_XOP_STWBRX: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 4, 0); break; case OP_31_XOP_LHBRX: emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0); break; case OP_31_XOP_STHBRX: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 2, 0); break; default: /* Attempt core-specific emulation below. */ emulated = EMULATE_FAIL; } break; case OP_LWZ: emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); break; /* TBD: Add support for other 64 bit load variants like ldu, ldux, ldx etc. */ case OP_LD: rt = get_rt(inst); emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1); break; case OP_LWZU: emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_LBZ: emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); break; case OP_LBZU: emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_STW: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 4, 1); break; /* TBD: Add support for other 64 bit store variants like stdu, stdux, stdx etc. */ case OP_STD: rs = get_rs(inst); emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 8, 1); break; case OP_STWU: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 4, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_STB: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 1, 1); break; case OP_STBU: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 1, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_LHZ: emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); break; case OP_LHZU: emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_LHA: emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1); break; case OP_LHAU: emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; case OP_STH: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 2, 1); break; case OP_STHU: emulated = kvmppc_handle_store(run, vcpu, kvmppc_get_gpr(vcpu, rs), 2, 1); kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed); break; default: emulated = EMULATE_FAIL; } if (emulated == EMULATE_FAIL) { emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance); if (emulated == EMULATE_AGAIN) { advance = 0; } else if (emulated == EMULATE_FAIL) { advance = 0; printk(KERN_ERR "Couldn't emulate instruction 0x%08x " "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst)); kvmppc_core_queue_program(vcpu, 0); } } trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated); /* Advance past emulated instruction. */ if (advance) kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); return emulated; }