/* * QEMU KVM support * * Copyright (C) 2006-2008 Qumranet Technologies * Copyright IBM, Corp. 2008 * * Authors: * Anthony Liguori * * 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 #include #include #include #include "qemu-common.h" #include "sysemu.h" #include "kvm.h" #include "cpu.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 int kvm_arch_init_vcpu(CPUState *env) { struct { struct kvm_cpuid cpuid; struct kvm_cpuid_entry entries[100]; } __attribute__((packed)) cpuid_data; int limit, i, cpuid_i; uint32_t eax, ebx, ecx, edx; cpuid_i = 0; cpu_x86_cpuid(env, 0, &eax, &ebx, &ecx, &edx); limit = eax; for (i = 0; i <= limit; i++) { struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++]; cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx); c->function = i; c->eax = eax; c->ebx = ebx; c->ecx = ecx; c->edx = edx; } cpu_x86_cpuid(env, 0x80000000, &eax, &ebx, &ecx, &edx); limit = eax; for (i = 0x80000000; i <= limit; i++) { struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++]; cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx); c->function = i; c->eax = eax; c->ebx = ebx; c->ecx = ecx; c->edx = edx; } cpuid_data.cpuid.nent = cpuid_i; return kvm_vcpu_ioctl(env, KVM_SET_CPUID, &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 */ ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, &msr_list); if (ret < 0) return 0; msr_list.nmsrs = 0; kvm_msr_list = qemu_mallocz(sizeof(msr_list) + msr_list.nmsrs * sizeof(msr_list.indices[0])); if (kvm_msr_list == NULL) return 0; 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, (void *)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, (void *)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; env->cc_src = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C); env->df = 1 - (2 * ((env->eflags >> 10) & 1)); env->cc_op = CC_OP_EFLAGS; env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C); 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; } 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; 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; }