/* * QEMU KVM support * * Copyright (C) 2006-2008 Qumranet Technologies * Copyright IBM, Corp. 2008 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. * */ #include <sys/types.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <linux/kvm.h> #include "qemu-common.h" #include "sysemu.h" #include "kvm.h" #include "cpu.h" #include "gdbstub.h" //#define DEBUG_KVM #ifdef DEBUG_KVM #define dprintf(fmt, ...) \ do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) #else #define dprintf(fmt, ...) \ do { } while (0) #endif #ifdef KVM_CAP_EXT_CPUID static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max) { struct kvm_cpuid2 *cpuid; int r, size; size = sizeof(*cpuid) + max * sizeof(*cpuid->entries); cpuid = (struct kvm_cpuid2 *)qemu_mallocz(size); cpuid->nent = max; r = kvm_ioctl(s, KVM_GET_SUPPORTED_CPUID, cpuid); if (r == 0 && cpuid->nent >= max) { r = -E2BIG; } if (r < 0) { if (r == -E2BIG) { qemu_free(cpuid); return NULL; } else { fprintf(stderr, "KVM_GET_SUPPORTED_CPUID failed: %s\n", strerror(-r)); exit(1); } } return cpuid; } uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg) { struct kvm_cpuid2 *cpuid; int i, max; uint32_t ret = 0; uint32_t cpuid_1_edx; if (!kvm_check_extension(env->kvm_state, KVM_CAP_EXT_CPUID)) { return -1U; } max = 1; while ((cpuid = try_get_cpuid(env->kvm_state, max)) == NULL) { max *= 2; } for (i = 0; i < cpuid->nent; ++i) { if (cpuid->entries[i].function == function) { switch (reg) { case R_EAX: ret = cpuid->entries[i].eax; break; case R_EBX: ret = cpuid->entries[i].ebx; break; case R_ECX: ret = cpuid->entries[i].ecx; break; case R_EDX: ret = cpuid->entries[i].edx; if (function == 0x80000001) { /* On Intel, kvm returns cpuid according to the Intel spec, * so add missing bits according to the AMD spec: */ cpuid_1_edx = kvm_arch_get_supported_cpuid(env, 1, R_EDX); ret |= cpuid_1_edx & 0xdfeff7ff; } break; } } } qemu_free(cpuid); return ret; } #else uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg) { return -1U; } #endif static void kvm_trim_features(uint32_t *features, uint32_t supported) { int i; uint32_t mask; for (i = 0; i < 32; ++i) { mask = 1U << i; if ((*features & mask) && !(supported & mask)) { *features &= ~mask; } } } int kvm_arch_init_vcpu(CPUState *env) { struct { struct kvm_cpuid2 cpuid; struct kvm_cpuid_entry2 entries[100]; } __attribute__((packed)) cpuid_data; uint32_t limit, i, j, cpuid_i; uint32_t unused; env->mp_state = KVM_MP_STATE_RUNNABLE; kvm_trim_features(&env->cpuid_features, kvm_arch_get_supported_cpuid(env, 1, R_EDX)); i = env->cpuid_ext_features & CPUID_EXT_HYPERVISOR; kvm_trim_features(&env->cpuid_ext_features, kvm_arch_get_supported_cpuid(env, 1, R_ECX)); env->cpuid_ext_features |= i; kvm_trim_features(&env->cpuid_ext2_features, kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX)); kvm_trim_features(&env->cpuid_ext3_features, kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX)); cpuid_i = 0; cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused); for (i = 0; i <= limit; i++) { struct kvm_cpuid_entry2 *c = &cpuid_data.entries[cpuid_i++]; switch (i) { case 2: { /* Keep reading function 2 till all the input is received */ int times; c->function = i; c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC | KVM_CPUID_FLAG_STATE_READ_NEXT; cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx); times = c->eax & 0xff; for (j = 1; j < times; ++j) { c = &cpuid_data.entries[cpuid_i++]; c->function = i; c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC; cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx); } break; } case 4: case 0xb: case 0xd: for (j = 0; ; j++) { c->function = i; c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX; c->index = j; cpu_x86_cpuid(env, i, j, &c->eax, &c->ebx, &c->ecx, &c->edx); if (i == 4 && c->eax == 0) break; if (i == 0xb && !(c->ecx & 0xff00)) break; if (i == 0xd && c->eax == 0) break; c = &cpuid_data.entries[cpuid_i++]; } break; default: c->function = i; c->flags = 0; cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx); break; } } cpu_x86_cpuid(env, 0x80000000, 0, &limit, &unused, &unused, &unused); for (i = 0x80000000; i <= limit; i++) { struct kvm_cpuid_entry2 *c = &cpuid_data.entries[cpuid_i++]; c->function = i; c->flags = 0; cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx); } cpuid_data.cpuid.nent = cpuid_i; return kvm_vcpu_ioctl(env, KVM_SET_CPUID2, &cpuid_data); } static int kvm_has_msr_star(CPUState *env) { static int has_msr_star; int ret; /* first time */ if (has_msr_star == 0) { struct kvm_msr_list msr_list, *kvm_msr_list; has_msr_star = -1; /* Obtain MSR list from KVM. These are the MSRs that we must * save/restore */ msr_list.nmsrs = 0; ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, &msr_list); if (ret < 0) return 0; /* Old kernel modules had a bug and could write beyond the provided memory. Allocate at least a safe amount of 1K. */ kvm_msr_list = qemu_mallocz(MAX(1024, sizeof(msr_list) + msr_list.nmsrs * sizeof(msr_list.indices[0]))); kvm_msr_list->nmsrs = msr_list.nmsrs; ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, kvm_msr_list); if (ret >= 0) { int i; for (i = 0; i < kvm_msr_list->nmsrs; i++) { if (kvm_msr_list->indices[i] == MSR_STAR) { has_msr_star = 1; break; } } } free(kvm_msr_list); } if (has_msr_star == 1) return 1; return 0; } int kvm_arch_init(KVMState *s, int smp_cpus) { int ret; /* create vm86 tss. KVM uses vm86 mode to emulate 16-bit code * directly. In order to use vm86 mode, a TSS is needed. Since this * must be part of guest physical memory, we need to allocate it. Older * versions of KVM just assumed that it would be at the end of physical * memory but that doesn't work with more than 4GB of memory. We simply * refuse to work with those older versions of KVM. */ ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SET_TSS_ADDR); if (ret <= 0) { fprintf(stderr, "kvm does not support KVM_CAP_SET_TSS_ADDR\n"); return ret; } /* this address is 3 pages before the bios, and the bios should present * as unavaible memory. FIXME, need to ensure the e820 map deals with * this? */ return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, 0xfffbd000); } static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs) { lhs->selector = rhs->selector; lhs->base = rhs->base; lhs->limit = rhs->limit; lhs->type = 3; lhs->present = 1; lhs->dpl = 3; lhs->db = 0; lhs->s = 1; lhs->l = 0; lhs->g = 0; lhs->avl = 0; lhs->unusable = 0; } static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs) { unsigned flags = rhs->flags; lhs->selector = rhs->selector; lhs->base = rhs->base; lhs->limit = rhs->limit; lhs->type = (flags >> DESC_TYPE_SHIFT) & 15; lhs->present = (flags & DESC_P_MASK) != 0; lhs->dpl = rhs->selector & 3; lhs->db = (flags >> DESC_B_SHIFT) & 1; lhs->s = (flags & DESC_S_MASK) != 0; lhs->l = (flags >> DESC_L_SHIFT) & 1; lhs->g = (flags & DESC_G_MASK) != 0; lhs->avl = (flags & DESC_AVL_MASK) != 0; lhs->unusable = 0; } static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs) { lhs->selector = rhs->selector; lhs->base = rhs->base; lhs->limit = rhs->limit; lhs->flags = (rhs->type << DESC_TYPE_SHIFT) | (rhs->present * DESC_P_MASK) | (rhs->dpl << DESC_DPL_SHIFT) | (rhs->db << DESC_B_SHIFT) | (rhs->s * DESC_S_MASK) | (rhs->l << DESC_L_SHIFT) | (rhs->g * DESC_G_MASK) | (rhs->avl * DESC_AVL_MASK); } static void kvm_getput_reg(__u64 *kvm_reg, target_ulong *qemu_reg, int set) { if (set) *kvm_reg = *qemu_reg; else *qemu_reg = *kvm_reg; } static int kvm_getput_regs(CPUState *env, int set) { struct kvm_regs regs; int ret = 0; if (!set) { ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, ®s); if (ret < 0) return ret; } kvm_getput_reg(®s.rax, &env->regs[R_EAX], set); kvm_getput_reg(®s.rbx, &env->regs[R_EBX], set); kvm_getput_reg(®s.rcx, &env->regs[R_ECX], set); kvm_getput_reg(®s.rdx, &env->regs[R_EDX], set); kvm_getput_reg(®s.rsi, &env->regs[R_ESI], set); kvm_getput_reg(®s.rdi, &env->regs[R_EDI], set); kvm_getput_reg(®s.rsp, &env->regs[R_ESP], set); kvm_getput_reg(®s.rbp, &env->regs[R_EBP], set); #ifdef TARGET_X86_64 kvm_getput_reg(®s.r8, &env->regs[8], set); kvm_getput_reg(®s.r9, &env->regs[9], set); kvm_getput_reg(®s.r10, &env->regs[10], set); kvm_getput_reg(®s.r11, &env->regs[11], set); kvm_getput_reg(®s.r12, &env->regs[12], set); kvm_getput_reg(®s.r13, &env->regs[13], set); kvm_getput_reg(®s.r14, &env->regs[14], set); kvm_getput_reg(®s.r15, &env->regs[15], set); #endif kvm_getput_reg(®s.rflags, &env->eflags, set); kvm_getput_reg(®s.rip, &env->eip, set); if (set) ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, ®s); return ret; } static int kvm_put_fpu(CPUState *env) { struct kvm_fpu fpu; int i; memset(&fpu, 0, sizeof fpu); fpu.fsw = env->fpus & ~(7 << 11); fpu.fsw |= (env->fpstt & 7) << 11; fpu.fcw = env->fpuc; for (i = 0; i < 8; ++i) fpu.ftwx |= (!env->fptags[i]) << i; memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs); memcpy(fpu.xmm, env->xmm_regs, sizeof env->xmm_regs); fpu.mxcsr = env->mxcsr; return kvm_vcpu_ioctl(env, KVM_SET_FPU, &fpu); } static int kvm_put_sregs(CPUState *env) { struct kvm_sregs sregs; memcpy(sregs.interrupt_bitmap, env->interrupt_bitmap, sizeof(sregs.interrupt_bitmap)); if ((env->eflags & VM_MASK)) { set_v8086_seg(&sregs.cs, &env->segs[R_CS]); set_v8086_seg(&sregs.ds, &env->segs[R_DS]); set_v8086_seg(&sregs.es, &env->segs[R_ES]); set_v8086_seg(&sregs.fs, &env->segs[R_FS]); set_v8086_seg(&sregs.gs, &env->segs[R_GS]); set_v8086_seg(&sregs.ss, &env->segs[R_SS]); } else { set_seg(&sregs.cs, &env->segs[R_CS]); set_seg(&sregs.ds, &env->segs[R_DS]); set_seg(&sregs.es, &env->segs[R_ES]); set_seg(&sregs.fs, &env->segs[R_FS]); set_seg(&sregs.gs, &env->segs[R_GS]); set_seg(&sregs.ss, &env->segs[R_SS]); if (env->cr[0] & CR0_PE_MASK) { /* force ss cpl to cs cpl */ sregs.ss.selector = (sregs.ss.selector & ~3) | (sregs.cs.selector & 3); sregs.ss.dpl = sregs.ss.selector & 3; } } set_seg(&sregs.tr, &env->tr); set_seg(&sregs.ldt, &env->ldt); sregs.idt.limit = env->idt.limit; sregs.idt.base = env->idt.base; sregs.gdt.limit = env->gdt.limit; sregs.gdt.base = env->gdt.base; sregs.cr0 = env->cr[0]; sregs.cr2 = env->cr[2]; sregs.cr3 = env->cr[3]; sregs.cr4 = env->cr[4]; sregs.cr8 = cpu_get_apic_tpr(env); sregs.apic_base = cpu_get_apic_base(env); sregs.efer = env->efer; return kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs); } static void kvm_msr_entry_set(struct kvm_msr_entry *entry, uint32_t index, uint64_t value) { entry->index = index; entry->data = value; } static int kvm_put_msrs(CPUState *env) { struct { struct kvm_msrs info; struct kvm_msr_entry entries[100]; } msr_data; struct kvm_msr_entry *msrs = msr_data.entries; int n = 0; kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs); kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp); kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip); if (kvm_has_msr_star(env)) kvm_msr_entry_set(&msrs[n++], MSR_STAR, env->star); kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc); #ifdef TARGET_X86_64 /* FIXME if lm capable */ kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar); kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase); kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask); kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar); #endif msr_data.info.nmsrs = n; return kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data); } static int kvm_get_fpu(CPUState *env) { struct kvm_fpu fpu; int i, ret; ret = kvm_vcpu_ioctl(env, KVM_GET_FPU, &fpu); if (ret < 0) return ret; env->fpstt = (fpu.fsw >> 11) & 7; env->fpus = fpu.fsw; env->fpuc = fpu.fcw; for (i = 0; i < 8; ++i) env->fptags[i] = !((fpu.ftwx >> i) & 1); memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs); memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs); env->mxcsr = fpu.mxcsr; return 0; } static int kvm_get_sregs(CPUState *env) { struct kvm_sregs sregs; uint32_t hflags; int ret; ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs); if (ret < 0) return ret; memcpy(env->interrupt_bitmap, sregs.interrupt_bitmap, sizeof(sregs.interrupt_bitmap)); get_seg(&env->segs[R_CS], &sregs.cs); get_seg(&env->segs[R_DS], &sregs.ds); get_seg(&env->segs[R_ES], &sregs.es); get_seg(&env->segs[R_FS], &sregs.fs); get_seg(&env->segs[R_GS], &sregs.gs); get_seg(&env->segs[R_SS], &sregs.ss); get_seg(&env->tr, &sregs.tr); get_seg(&env->ldt, &sregs.ldt); env->idt.limit = sregs.idt.limit; env->idt.base = sregs.idt.base; env->gdt.limit = sregs.gdt.limit; env->gdt.base = sregs.gdt.base; env->cr[0] = sregs.cr0; env->cr[2] = sregs.cr2; env->cr[3] = sregs.cr3; env->cr[4] = sregs.cr4; cpu_set_apic_base(env, sregs.apic_base); env->efer = sregs.efer; //cpu_set_apic_tpr(env, sregs.cr8); #define HFLAG_COPY_MASK ~( \ HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \ HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \ HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \ HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK) hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK; hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT); hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) & (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK); hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK)); hflags |= (env->cr[4] & CR4_OSFXSR_MASK) << (HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT); if (env->efer & MSR_EFER_LMA) { hflags |= HF_LMA_MASK; } if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) { hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK; } else { hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >> (DESC_B_SHIFT - HF_CS32_SHIFT); hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >> (DESC_B_SHIFT - HF_SS32_SHIFT); if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK) || !(hflags & HF_CS32_MASK)) { hflags |= HF_ADDSEG_MASK; } else { hflags |= ((env->segs[R_DS].base | env->segs[R_ES].base | env->segs[R_SS].base) != 0) << HF_ADDSEG_SHIFT; } } env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags; return 0; } static int kvm_get_msrs(CPUState *env) { struct { struct kvm_msrs info; struct kvm_msr_entry entries[100]; } msr_data; struct kvm_msr_entry *msrs = msr_data.entries; int ret, i, n; n = 0; msrs[n++].index = MSR_IA32_SYSENTER_CS; msrs[n++].index = MSR_IA32_SYSENTER_ESP; msrs[n++].index = MSR_IA32_SYSENTER_EIP; if (kvm_has_msr_star(env)) msrs[n++].index = MSR_STAR; msrs[n++].index = MSR_IA32_TSC; #ifdef TARGET_X86_64 /* FIXME lm_capable_kernel */ msrs[n++].index = MSR_CSTAR; msrs[n++].index = MSR_KERNELGSBASE; msrs[n++].index = MSR_FMASK; msrs[n++].index = MSR_LSTAR; #endif msr_data.info.nmsrs = n; ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data); if (ret < 0) return ret; for (i = 0; i < ret; i++) { switch (msrs[i].index) { case MSR_IA32_SYSENTER_CS: env->sysenter_cs = msrs[i].data; break; case MSR_IA32_SYSENTER_ESP: env->sysenter_esp = msrs[i].data; break; case MSR_IA32_SYSENTER_EIP: env->sysenter_eip = msrs[i].data; break; case MSR_STAR: env->star = msrs[i].data; break; #ifdef TARGET_X86_64 case MSR_CSTAR: env->cstar = msrs[i].data; break; case MSR_KERNELGSBASE: env->kernelgsbase = msrs[i].data; break; case MSR_FMASK: env->fmask = msrs[i].data; break; case MSR_LSTAR: env->lstar = msrs[i].data; break; #endif case MSR_IA32_TSC: env->tsc = msrs[i].data; break; } } return 0; } static int kvm_put_mp_state(CPUState *env) { struct kvm_mp_state mp_state = { .mp_state = env->mp_state }; return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state); } static int kvm_get_mp_state(CPUState *env) { struct kvm_mp_state mp_state; int ret; ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state); if (ret < 0) { return ret; } env->mp_state = mp_state.mp_state; return 0; } int kvm_arch_put_registers(CPUState *env) { int ret; ret = kvm_getput_regs(env, 1); if (ret < 0) return ret; ret = kvm_put_fpu(env); if (ret < 0) return ret; ret = kvm_put_sregs(env); if (ret < 0) return ret; ret = kvm_put_msrs(env); if (ret < 0) return ret; ret = kvm_put_mp_state(env); if (ret < 0) return ret; ret = kvm_get_mp_state(env); if (ret < 0) return ret; return 0; } int kvm_arch_get_registers(CPUState *env) { int ret; ret = kvm_getput_regs(env, 0); if (ret < 0) return ret; ret = kvm_get_fpu(env); if (ret < 0) return ret; ret = kvm_get_sregs(env); if (ret < 0) return ret; ret = kvm_get_msrs(env); if (ret < 0) return ret; return 0; } int kvm_arch_pre_run(CPUState *env, struct kvm_run *run) { /* Try to inject an interrupt if the guest can accept it */ if (run->ready_for_interrupt_injection && (env->interrupt_request & CPU_INTERRUPT_HARD) && (env->eflags & IF_MASK)) { int irq; env->interrupt_request &= ~CPU_INTERRUPT_HARD; irq = cpu_get_pic_interrupt(env); if (irq >= 0) { struct kvm_interrupt intr; intr.irq = irq; /* FIXME: errors */ dprintf("injected interrupt %d\n", irq); kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr); } } /* If we have an interrupt but the guest is not ready to receive an * interrupt, request an interrupt window exit. This will * cause a return to userspace as soon as the guest is ready to * receive interrupts. */ if ((env->interrupt_request & CPU_INTERRUPT_HARD)) run->request_interrupt_window = 1; else run->request_interrupt_window = 0; dprintf("setting tpr\n"); run->cr8 = cpu_get_apic_tpr(env); return 0; } int kvm_arch_post_run(CPUState *env, struct kvm_run *run) { if (run->if_flag) env->eflags |= IF_MASK; else env->eflags &= ~IF_MASK; cpu_set_apic_tpr(env, run->cr8); cpu_set_apic_base(env, run->apic_base); return 0; } static int kvm_handle_halt(CPUState *env) { if (!((env->interrupt_request & CPU_INTERRUPT_HARD) && (env->eflags & IF_MASK)) && !(env->interrupt_request & CPU_INTERRUPT_NMI)) { env->halted = 1; env->exception_index = EXCP_HLT; return 0; } return 1; } int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run) { int ret = 0; switch (run->exit_reason) { case KVM_EXIT_HLT: dprintf("handle_hlt\n"); ret = kvm_handle_halt(env); break; } return ret; } #ifdef KVM_CAP_SET_GUEST_DEBUG int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp) { static const uint8_t int3 = 0xcc; if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 0) || cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&int3, 1, 1)) return -EINVAL; return 0; } int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp) { uint8_t int3; if (cpu_memory_rw_debug(env, bp->pc, &int3, 1, 0) || int3 != 0xcc || cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) return -EINVAL; return 0; } static struct { target_ulong addr; int len; int type; } hw_breakpoint[4]; static int nb_hw_breakpoint; static int find_hw_breakpoint(target_ulong addr, int len, int type) { int n; for (n = 0; n < nb_hw_breakpoint; n++) if (hw_breakpoint[n].addr == addr && hw_breakpoint[n].type == type && (hw_breakpoint[n].len == len || len == -1)) return n; return -1; } int kvm_arch_insert_hw_breakpoint(target_ulong addr, target_ulong len, int type) { switch (type) { case GDB_BREAKPOINT_HW: len = 1; break; case GDB_WATCHPOINT_WRITE: case GDB_WATCHPOINT_ACCESS: switch (len) { case 1: break; case 2: case 4: case 8: if (addr & (len - 1)) return -EINVAL; break; default: return -EINVAL; } break; default: return -ENOSYS; } if (nb_hw_breakpoint == 4) return -ENOBUFS; if (find_hw_breakpoint(addr, len, type) >= 0) return -EEXIST; hw_breakpoint[nb_hw_breakpoint].addr = addr; hw_breakpoint[nb_hw_breakpoint].len = len; hw_breakpoint[nb_hw_breakpoint].type = type; nb_hw_breakpoint++; return 0; } int kvm_arch_remove_hw_breakpoint(target_ulong addr, target_ulong len, int type) { int n; n = find_hw_breakpoint(addr, (type == GDB_BREAKPOINT_HW) ? 1 : len, type); if (n < 0) return -ENOENT; nb_hw_breakpoint--; hw_breakpoint[n] = hw_breakpoint[nb_hw_breakpoint]; return 0; } void kvm_arch_remove_all_hw_breakpoints(void) { nb_hw_breakpoint = 0; } static CPUWatchpoint hw_watchpoint; int kvm_arch_debug(struct kvm_debug_exit_arch *arch_info) { int handle = 0; int n; if (arch_info->exception == 1) { if (arch_info->dr6 & (1 << 14)) { if (cpu_single_env->singlestep_enabled) handle = 1; } else { for (n = 0; n < 4; n++) if (arch_info->dr6 & (1 << n)) switch ((arch_info->dr7 >> (16 + n*4)) & 0x3) { case 0x0: handle = 1; break; case 0x1: handle = 1; cpu_single_env->watchpoint_hit = &hw_watchpoint; hw_watchpoint.vaddr = hw_breakpoint[n].addr; hw_watchpoint.flags = BP_MEM_WRITE; break; case 0x3: handle = 1; cpu_single_env->watchpoint_hit = &hw_watchpoint; hw_watchpoint.vaddr = hw_breakpoint[n].addr; hw_watchpoint.flags = BP_MEM_ACCESS; break; } } } else if (kvm_find_sw_breakpoint(cpu_single_env, arch_info->pc)) handle = 1; if (!handle) kvm_update_guest_debug(cpu_single_env, (arch_info->exception == 1) ? KVM_GUESTDBG_INJECT_DB : KVM_GUESTDBG_INJECT_BP); return handle; } void kvm_arch_update_guest_debug(CPUState *env, struct kvm_guest_debug *dbg) { const uint8_t type_code[] = { [GDB_BREAKPOINT_HW] = 0x0, [GDB_WATCHPOINT_WRITE] = 0x1, [GDB_WATCHPOINT_ACCESS] = 0x3 }; const uint8_t len_code[] = { [1] = 0x0, [2] = 0x1, [4] = 0x3, [8] = 0x2 }; int n; if (kvm_sw_breakpoints_active(env)) dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP; if (nb_hw_breakpoint > 0) { dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP; dbg->arch.debugreg[7] = 0x0600; for (n = 0; n < nb_hw_breakpoint; n++) { dbg->arch.debugreg[n] = hw_breakpoint[n].addr; dbg->arch.debugreg[7] |= (2 << (n * 2)) | (type_code[hw_breakpoint[n].type] << (16 + n*4)) | (len_code[hw_breakpoint[n].len] << (18 + n*4)); } } } #endif /* KVM_CAP_SET_GUEST_DEBUG */