diff options
Diffstat (limited to 'arch/powerpc/kvm/booke.c')
| -rw-r--r-- | arch/powerpc/kvm/booke.c | 565 |
1 files changed, 565 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c new file mode 100644 index 000000000000..35485dd6927e --- /dev/null +++ b/arch/powerpc/kvm/booke.c @@ -0,0 +1,565 @@ +/* + * 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 <hollisb@us.ibm.com> + * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/kvm_host.h> +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> + +#include <asm/cputable.h> +#include <asm/uaccess.h> +#include <asm/kvm_ppc.h> +#include "timing.h" +#include <asm/cacheflush.h> +#include <asm/kvm_44x.h> + +#include "booke.h" +#include "44x_tlb.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: %08lx\n", vcpu->arch.pc, vcpu->arch.msr); + printk("lr: %08lx ctr: %08lx\n", vcpu->arch.lr, vcpu->arch.ctr); + printk("srr0: %08lx srr1: %08lx\n", vcpu->arch.srr0, vcpu->arch.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, + vcpu->arch.gpr[i], + vcpu->arch.gpr[i+1], + vcpu->arch.gpr[i+2], + vcpu->arch.gpr[i+3]); + } +} + +static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu, + unsigned int priority) +{ + set_bit(priority, &vcpu->arch.pending_exceptions); +} + +void kvmppc_core_queue_program(struct kvm_vcpu *vcpu) +{ + 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_queue_external(struct kvm_vcpu *vcpu, + struct kvm_interrupt *irq) +{ + kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_EXTERNAL); +} + +/* 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 msr_mask; + + switch (priority) { + case BOOKE_IRQPRIO_PROGRAM: + case BOOKE_IRQPRIO_DTLB_MISS: + case BOOKE_IRQPRIO_ITLB_MISS: + case BOOKE_IRQPRIO_SYSCALL: + case BOOKE_IRQPRIO_DATA_STORAGE: + case BOOKE_IRQPRIO_INST_STORAGE: + case BOOKE_IRQPRIO_FP_UNAVAIL: + 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.msr & MSR_CE; + msr_mask = MSR_ME; + break; + case BOOKE_IRQPRIO_MACHINE_CHECK: + allowed = vcpu->arch.msr & MSR_ME; + msr_mask = 0; + break; + case BOOKE_IRQPRIO_EXTERNAL: + case BOOKE_IRQPRIO_DECREMENTER: + case BOOKE_IRQPRIO_FIT: + allowed = vcpu->arch.msr & MSR_EE; + msr_mask = MSR_CE|MSR_ME|MSR_DE; + break; + case BOOKE_IRQPRIO_DEBUG: + allowed = vcpu->arch.msr & MSR_DE; + msr_mask = MSR_ME; + break; + } + + if (allowed) { + vcpu->arch.srr0 = vcpu->arch.pc; + vcpu->arch.srr1 = vcpu->arch.msr; + vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority]; + kvmppc_set_msr(vcpu, vcpu->arch.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_MAX_INTERRUPT) { + 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.msr & MSR_PR) { + /* Program traps generated by user-level software must be handled + * by the guest kernel. */ + vcpu->arch.esr = vcpu->arch.fault_esr; + kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM); + 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_DATA_STORAGE: + vcpu->arch.dear = vcpu->arch.fault_dear; + vcpu->arch.esr = vcpu->arch.fault_esr; + kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE); + kvmppc_account_exit(vcpu, DSI_EXITS); + r = RESUME_GUEST; + break; + + case BOOKE_INTERRUPT_INST_STORAGE: + vcpu->arch.esr = vcpu->arch.fault_esr; + kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE); + kvmppc_account_exit(vcpu, ISI_EXITS); + r = RESUME_GUEST; + break; + + case BOOKE_INTERRUPT_SYSCALL: + kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL); + kvmppc_account_exit(vcpu, SYSCALL_EXITS); + r = RESUME_GUEST; + break; + + /* XXX move to a 440-specific file. */ + case BOOKE_INTERRUPT_DTLB_MISS: { + struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu); + struct kvmppc_44x_tlbe *gtlbe; + unsigned long eaddr = vcpu->arch.fault_dear; + int gtlb_index; + gfn_t gfn; + + /* Check the guest TLB. */ + gtlb_index = kvmppc_44x_dtlb_index(vcpu, eaddr); + if (gtlb_index < 0) { + /* The guest didn't have a mapping for it. */ + kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS); + vcpu->arch.dear = vcpu->arch.fault_dear; + vcpu->arch.esr = vcpu->arch.fault_esr; + kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS); + r = RESUME_GUEST; + break; + } + + gtlbe = &vcpu_44x->guest_tlb[gtlb_index]; + vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr); + gfn = vcpu->arch.paddr_accessed >> 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, vcpu->arch.paddr_accessed, gtlbe->tid, + gtlbe->word2, get_tlb_bytes(gtlbe), 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. */ + r = kvmppc_emulate_mmio(run, vcpu); + kvmppc_account_exit(vcpu, MMIO_EXITS); + } + + break; + } + + /* XXX move to a 440-specific file. */ + case BOOKE_INTERRUPT_ITLB_MISS: { + struct kvmppc_vcpu_44x *vcpu_44x = to_44x(vcpu); + struct kvmppc_44x_tlbe *gtlbe; + 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_44x_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_account_exit(vcpu, ITLB_REAL_MISS_EXITS); + break; + } + + kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS); + + gtlbe = &vcpu_44x->guest_tlb[gtlb_index]; + gpaddr = tlb_xlate(gtlbe, 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, gtlbe->tid, + gtlbe->word2, get_tlb_bytes(gtlbe), 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.msr = 0; + vcpu->arch.gpr[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 = vcpu->arch.cr; + regs->ctr = vcpu->arch.ctr; + regs->lr = vcpu->arch.lr; + regs->xer = vcpu->arch.xer; + regs->msr = vcpu->arch.msr; + regs->srr0 = vcpu->arch.srr0; + regs->srr1 = vcpu->arch.srr1; + regs->pid = vcpu->arch.pid; + regs->sprg0 = vcpu->arch.sprg0; + regs->sprg1 = vcpu->arch.sprg1; + regs->sprg2 = vcpu->arch.sprg2; + regs->sprg3 = vcpu->arch.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] = vcpu->arch.gpr[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; + vcpu->arch.cr = regs->cr; + vcpu->arch.ctr = regs->ctr; + vcpu->arch.lr = regs->lr; + vcpu->arch.xer = regs->xer; + kvmppc_set_msr(vcpu, regs->msr); + vcpu->arch.srr0 = regs->srr0; + vcpu->arch.srr1 = regs->srr1; + vcpu->arch.sprg0 = regs->sprg0; + vcpu->arch.sprg1 = regs->sprg1; + vcpu->arch.sprg2 = regs->sprg2; + vcpu->arch.sprg3 = regs->sprg3; + vcpu->arch.sprg5 = regs->sprg4; + vcpu->arch.sprg6 = regs->sprg5; + vcpu->arch.sprg7 = regs->sprg6; + + for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++) + vcpu->arch.gpr[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) +{ + return kvmppc_core_vcpu_translate(vcpu, tr); +} + +int 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(); +} |