/* * 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 * * Authors: Hollis Blanchard * Christian Ehrhardt */ #include #include #include #include #include #include #include #include #include #include #include "timing.h" #include #include "booke.h" unsigned long kvmppc_booke_handlers; #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU struct kvm_stats_debugfs_item debugfs_entries[] = { { "mmio", VCPU_STAT(mmio_exits) }, { "dcr", VCPU_STAT(dcr_exits) }, { "sig", VCPU_STAT(signal_exits) }, { "itlb_r", VCPU_STAT(itlb_real_miss_exits) }, { "itlb_v", VCPU_STAT(itlb_virt_miss_exits) }, { "dtlb_r", VCPU_STAT(dtlb_real_miss_exits) }, { "dtlb_v", VCPU_STAT(dtlb_virt_miss_exits) }, { "sysc", VCPU_STAT(syscall_exits) }, { "isi", VCPU_STAT(isi_exits) }, { "dsi", VCPU_STAT(dsi_exits) }, { "inst_emu", VCPU_STAT(emulated_inst_exits) }, { "dec", VCPU_STAT(dec_exits) }, { "ext_intr", VCPU_STAT(ext_intr_exits) }, { "halt_wakeup", VCPU_STAT(halt_wakeup) }, { NULL } }; /* TODO: use vcpu_printf() */ void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu) { int i; printk("pc: %08lx msr: %08llx\n", vcpu->arch.pc, vcpu->arch.shared->msr); printk("lr: %08lx ctr: %08lx\n", vcpu->arch.lr, vcpu->arch.ctr); printk("srr0: %08llx srr1: %08llx\n", vcpu->arch.shared->srr0, vcpu->arch.shared->srr1); printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions); for (i = 0; i < 32; i += 4) { printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i, kvmppc_get_gpr(vcpu, i), kvmppc_get_gpr(vcpu, i+1), kvmppc_get_gpr(vcpu, i+2), kvmppc_get_gpr(vcpu, i+3)); } } static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int priority) { set_bit(priority, &vcpu->arch.pending_exceptions); } static void kvmppc_core_queue_dtlb_miss(struct kvm_vcpu *vcpu, ulong dear_flags, ulong esr_flags) { vcpu->arch.queued_dear = dear_flags; vcpu->arch.queued_esr = esr_flags; kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS); } static void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu, ulong dear_flags, ulong esr_flags) { vcpu->arch.queued_dear = dear_flags; vcpu->arch.queued_esr = esr_flags; kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE); } static void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu, ulong esr_flags) { vcpu->arch.queued_esr = esr_flags; kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE); } void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong esr_flags) { vcpu->arch.queued_esr = esr_flags; kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM); } void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu) { kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER); } int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu) { return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions); } void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu) { clear_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions); } void kvmppc_core_queue_external(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_EXTERNAL); } void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { clear_bit(BOOKE_IRQPRIO_EXTERNAL, &vcpu->arch.pending_exceptions); } /* Deliver the interrupt of the corresponding priority, if possible. */ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority) { int allowed = 0; ulong uninitialized_var(msr_mask); bool update_esr = false, update_dear = false; ulong crit_raw = vcpu->arch.shared->critical; ulong crit_r1 = kvmppc_get_gpr(vcpu, 1); bool crit; /* Truncate crit indicators in 32 bit mode */ if (!(vcpu->arch.shared->msr & MSR_SF)) { crit_raw &= 0xffffffff; crit_r1 &= 0xffffffff; } /* Critical section when crit == r1 */ crit = (crit_raw == crit_r1); /* ... and we're in supervisor mode */ crit = crit && !(vcpu->arch.shared->msr & MSR_PR); switch (priority) { case BOOKE_IRQPRIO_DTLB_MISS: case BOOKE_IRQPRIO_DATA_STORAGE: update_dear = true; /* fall through */ case BOOKE_IRQPRIO_INST_STORAGE: case BOOKE_IRQPRIO_PROGRAM: update_esr = true; /* fall through */ case BOOKE_IRQPRIO_ITLB_MISS: case BOOKE_IRQPRIO_SYSCALL: case BOOKE_IRQPRIO_FP_UNAVAIL: case BOOKE_IRQPRIO_SPE_UNAVAIL: case BOOKE_IRQPRIO_SPE_FP_DATA: case BOOKE_IRQPRIO_SPE_FP_ROUND: case BOOKE_IRQPRIO_AP_UNAVAIL: case BOOKE_IRQPRIO_ALIGNMENT: allowed = 1; msr_mask = MSR_CE|MSR_ME|MSR_DE; break; case BOOKE_IRQPRIO_CRITICAL: case BOOKE_IRQPRIO_WATCHDOG: allowed = vcpu->arch.shared->msr & MSR_CE; msr_mask = MSR_ME; break; case BOOKE_IRQPRIO_MACHINE_CHECK: allowed = vcpu->arch.shared->msr & MSR_ME; msr_mask = 0; break; case BOOKE_IRQPRIO_EXTERNAL: case BOOKE_IRQPRIO_DECREMENTER: case BOOKE_IRQPRIO_FIT: allowed = vcpu->arch.shared->msr & MSR_EE; allowed = allowed && !crit; msr_mask = MSR_CE|MSR_ME|MSR_DE; break; case BOOKE_IRQPRIO_DEBUG: allowed = vcpu->arch.shared->msr & MSR_DE; msr_mask = MSR_ME; break; } if (allowed) { vcpu->arch.shared->srr0 = vcpu->arch.pc; vcpu->arch.shared->srr1 = vcpu->arch.shared->msr; vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority]; if (update_esr == true) vcpu->arch.esr = vcpu->arch.queued_esr; if (update_dear == true) vcpu->arch.shared->dar = vcpu->arch.queued_dear; kvmppc_set_msr(vcpu, vcpu->arch.shared->msr & msr_mask); clear_bit(priority, &vcpu->arch.pending_exceptions); } return allowed; } /* Check pending exceptions and deliver one, if possible. */ void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; unsigned int priority; priority = __ffs(*pending); while (priority <= BOOKE_IRQPRIO_MAX) { if (kvmppc_booke_irqprio_deliver(vcpu, priority)) break; priority = find_next_bit(pending, BITS_PER_BYTE * sizeof(*pending), priority + 1); } } /** * kvmppc_handle_exit * * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV) */ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, unsigned int exit_nr) { enum emulation_result er; int r = RESUME_HOST; /* update before a new last_exit_type is rewritten */ kvmppc_update_timing_stats(vcpu); local_irq_enable(); run->exit_reason = KVM_EXIT_UNKNOWN; run->ready_for_interrupt_injection = 1; switch (exit_nr) { case BOOKE_INTERRUPT_MACHINE_CHECK: printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR)); kvmppc_dump_vcpu(vcpu); r = RESUME_HOST; break; case BOOKE_INTERRUPT_EXTERNAL: kvmppc_account_exit(vcpu, EXT_INTR_EXITS); if (need_resched()) cond_resched(); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_DECREMENTER: /* Since we switched IVPR back to the host's value, the host * handled this interrupt the moment we enabled interrupts. * Now we just offer it a chance to reschedule the guest. */ kvmppc_account_exit(vcpu, DEC_EXITS); if (need_resched()) cond_resched(); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_PROGRAM: if (vcpu->arch.shared->msr & MSR_PR) { /* Program traps generated by user-level software must be handled * by the guest kernel. */ kvmppc_core_queue_program(vcpu, vcpu->arch.fault_esr); r = RESUME_GUEST; kvmppc_account_exit(vcpu, USR_PR_INST); break; } er = kvmppc_emulate_instruction(run, vcpu); switch (er) { case EMULATE_DONE: /* don't overwrite subtypes, just account kvm_stats */ kvmppc_account_exit_stat(vcpu, EMULATED_INST_EXITS); /* Future optimization: only reload non-volatiles if * they were actually modified by emulation. */ r = RESUME_GUEST_NV; break; case EMULATE_DO_DCR: run->exit_reason = KVM_EXIT_DCR; r = RESUME_HOST; break; case EMULATE_FAIL: /* XXX Deliver Program interrupt to guest. */ printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n", __func__, vcpu->arch.pc, vcpu->arch.last_inst); /* For debugging, encode the failing instruction and * report it to userspace. */ run->hw.hardware_exit_reason = ~0ULL << 32; run->hw.hardware_exit_reason |= vcpu->arch.last_inst; r = RESUME_HOST; break; default: BUG(); } break; case BOOKE_INTERRUPT_FP_UNAVAIL: kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL); kvmppc_account_exit(vcpu, FP_UNAVAIL); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_SPE_UNAVAIL: kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_UNAVAIL); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_SPE_FP_DATA: kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_DATA); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_SPE_FP_ROUND: kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_ROUND); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_DATA_STORAGE: kvmppc_core_queue_data_storage(vcpu, vcpu->arch.fault_dear, vcpu->arch.fault_esr); kvmppc_account_exit(vcpu, DSI_EXITS); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_INST_STORAGE: kvmppc_core_queue_inst_storage(vcpu, vcpu->arch.fault_esr); kvmppc_account_exit(vcpu, ISI_EXITS); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_SYSCALL: if (!(vcpu->arch.shared->msr & MSR_PR) && (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) { /* KVM PV hypercalls */ kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu)); r = RESUME_GUEST; } else { /* Guest syscalls */ kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL); } kvmppc_account_exit(vcpu, SYSCALL_EXITS); r = RESUME_GUEST; break; case BOOKE_INTERRUPT_DTLB_MISS: { unsigned long eaddr = vcpu->arch.fault_dear; int gtlb_index; gpa_t gpaddr; gfn_t gfn; /* Check the guest TLB. */ gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr); if (gtlb_index < 0) { /* The guest didn't have a mapping for it. */ kvmppc_core_queue_dtlb_miss(vcpu, vcpu->arch.fault_dear, vcpu->arch.fault_esr); kvmppc_mmu_dtlb_miss(vcpu); kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS); r = RESUME_GUEST; break; } gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr); gfn = gpaddr >> PAGE_SHIFT; if (kvm_is_visible_gfn(vcpu->kvm, gfn)) { /* The guest TLB had a mapping, but the shadow TLB * didn't, and it is RAM. This could be because: * a) the entry is mapping the host kernel, or * b) the guest used a large mapping which we're faking * Either way, we need to satisfy the fault without * invoking the guest. */ kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index); kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS); r = RESUME_GUEST; } else { /* Guest has mapped and accessed a page which is not * actually RAM. */ vcpu->arch.paddr_accessed = gpaddr; r = kvmppc_emulate_mmio(run, vcpu); kvmppc_account_exit(vcpu, MMIO_EXITS); } break; } case BOOKE_INTERRUPT_ITLB_MISS: { unsigned long eaddr = vcpu->arch.pc; gpa_t gpaddr; gfn_t gfn; int gtlb_index; r = RESUME_GUEST; /* Check the guest TLB. */ gtlb_index = kvmppc_mmu_itlb_index(vcpu, eaddr); if (gtlb_index < 0) { /* The guest didn't have a mapping for it. */ kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS); kvmppc_mmu_itlb_miss(vcpu); kvmppc_account_exit(vcpu, ITLB_REAL_MISS_EXITS); break; } kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS); gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr); gfn = gpaddr >> PAGE_SHIFT; if (kvm_is_visible_gfn(vcpu->kvm, gfn)) { /* The guest TLB had a mapping, but the shadow TLB * didn't. This could be because: * a) the entry is mapping the host kernel, or * b) the guest used a large mapping which we're faking * Either way, we need to satisfy the fault without * invoking the guest. */ kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index); } else { /* Guest mapped and leaped at non-RAM! */ kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_MACHINE_CHECK); } break; } case BOOKE_INTERRUPT_DEBUG: { u32 dbsr; vcpu->arch.pc = mfspr(SPRN_CSRR0); /* clear IAC events in DBSR register */ dbsr = mfspr(SPRN_DBSR); dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4; mtspr(SPRN_DBSR, dbsr); run->exit_reason = KVM_EXIT_DEBUG; kvmppc_account_exit(vcpu, DEBUG_EXITS); r = RESUME_HOST; break; } default: printk(KERN_EMERG "exit_nr %d\n", exit_nr); BUG(); } local_irq_disable(); kvmppc_core_deliver_interrupts(vcpu); if (!(r & RESUME_HOST)) { /* To avoid clobbering exit_reason, only check for signals if * we aren't already exiting to userspace for some other * reason. */ if (signal_pending(current)) { run->exit_reason = KVM_EXIT_INTR; r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV); kvmppc_account_exit(vcpu, SIGNAL_EXITS); } } return r; } /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) { vcpu->arch.pc = 0; vcpu->arch.shared->msr = 0; kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */ vcpu->arch.shadow_pid = 1; /* Eye-catching number so we know if the guest takes an interrupt * before it's programmed its own IVPR. */ vcpu->arch.ivpr = 0x55550000; kvmppc_init_timing_stats(vcpu); return kvmppc_core_vcpu_setup(vcpu); } int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { int i; regs->pc = vcpu->arch.pc; regs->cr = kvmppc_get_cr(vcpu); regs->ctr = vcpu->arch.ctr; regs->lr = vcpu->arch.lr; regs->xer = kvmppc_get_xer(vcpu); regs->msr = vcpu->arch.shared->msr; regs->srr0 = vcpu->arch.shared->srr0; regs->srr1 = vcpu->arch.shared->srr1; regs->pid = vcpu->arch.pid; regs->sprg0 = vcpu->arch.shared->sprg0; regs->sprg1 = vcpu->arch.shared->sprg1; regs->sprg2 = vcpu->arch.shared->sprg2; regs->sprg3 = vcpu->arch.shared->sprg3; regs->sprg5 = vcpu->arch.sprg4; regs->sprg6 = vcpu->arch.sprg5; regs->sprg7 = vcpu->arch.sprg6; for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) regs->gpr[i] = kvmppc_get_gpr(vcpu, i); return 0; } int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { int i; vcpu->arch.pc = regs->pc; kvmppc_set_cr(vcpu, regs->cr); vcpu->arch.ctr = regs->ctr; vcpu->arch.lr = regs->lr; kvmppc_set_xer(vcpu, regs->xer); kvmppc_set_msr(vcpu, regs->msr); vcpu->arch.shared->srr0 = regs->srr0; vcpu->arch.shared->srr1 = regs->srr1; vcpu->arch.shared->sprg0 = regs->sprg0; vcpu->arch.shared->sprg1 = regs->sprg1; vcpu->arch.shared->sprg2 = regs->sprg2; vcpu->arch.shared->sprg3 = regs->sprg3; vcpu->arch.sprg5 = regs->sprg4; vcpu->arch.sprg6 = regs->sprg5; vcpu->arch.sprg7 = regs->sprg6; for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) kvmppc_set_gpr(vcpu, i, regs->gpr[i]); return 0; } int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { return -ENOTSUPP; } int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) { return -ENOTSUPP; } int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { return -ENOTSUPP; } int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { return -ENOTSUPP; } int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr) { int r; r = kvmppc_core_vcpu_translate(vcpu, tr); return r; } int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) { return -ENOTSUPP; } int __init kvmppc_booke_init(void) { unsigned long ivor[16]; unsigned long max_ivor = 0; int i; /* We install our own exception handlers by hijacking IVPR. IVPR must * be 16-bit aligned, so we need a 64KB allocation. */ kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO, VCPU_SIZE_ORDER); if (!kvmppc_booke_handlers) return -ENOMEM; /* XXX make sure our handlers are smaller than Linux's */ /* Copy our interrupt handlers to match host IVORs. That way we don't * have to swap the IVORs on every guest/host transition. */ ivor[0] = mfspr(SPRN_IVOR0); ivor[1] = mfspr(SPRN_IVOR1); ivor[2] = mfspr(SPRN_IVOR2); ivor[3] = mfspr(SPRN_IVOR3); ivor[4] = mfspr(SPRN_IVOR4); ivor[5] = mfspr(SPRN_IVOR5); ivor[6] = mfspr(SPRN_IVOR6); ivor[7] = mfspr(SPRN_IVOR7); ivor[8] = mfspr(SPRN_IVOR8); ivor[9] = mfspr(SPRN_IVOR9); ivor[10] = mfspr(SPRN_IVOR10); ivor[11] = mfspr(SPRN_IVOR11); ivor[12] = mfspr(SPRN_IVOR12); ivor[13] = mfspr(SPRN_IVOR13); ivor[14] = mfspr(SPRN_IVOR14); ivor[15] = mfspr(SPRN_IVOR15); for (i = 0; i < 16; i++) { if (ivor[i] > max_ivor) max_ivor = ivor[i]; memcpy((void *)kvmppc_booke_handlers + ivor[i], kvmppc_handlers_start + i * kvmppc_handler_len, kvmppc_handler_len); } flush_icache_range(kvmppc_booke_handlers, kvmppc_booke_handlers + max_ivor + kvmppc_handler_len); return 0; } void __exit kvmppc_booke_exit(void) { free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER); kvm_exit(); }