diff options
Diffstat (limited to 'target/i386/nvmm/nvmm-all.c')
| -rw-r--r-- | target/i386/nvmm/nvmm-all.c | 1226 |
1 files changed, 1226 insertions, 0 deletions
diff --git a/target/i386/nvmm/nvmm-all.c b/target/i386/nvmm/nvmm-all.c new file mode 100644 index 0000000000..dfa690d65d --- /dev/null +++ b/target/i386/nvmm/nvmm-all.c @@ -0,0 +1,1226 @@ +/* + * Copyright (c) 2018-2019 Maxime Villard, All rights reserved. + * + * NetBSD Virtual Machine Monitor (NVMM) accelerator for QEMU. + * + * 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 "qemu/osdep.h" +#include "cpu.h" +#include "exec/address-spaces.h" +#include "exec/ioport.h" +#include "qemu-common.h" +#include "qemu/accel.h" +#include "sysemu/nvmm.h" +#include "sysemu/cpus.h" +#include "sysemu/runstate.h" +#include "qemu/main-loop.h" +#include "qemu/error-report.h" +#include "qapi/error.h" +#include "qemu/queue.h" +#include "migration/blocker.h" +#include "strings.h" + +#include "nvmm-accel-ops.h" + +#include <nvmm.h> + +struct qemu_vcpu { + struct nvmm_vcpu vcpu; + uint8_t tpr; + bool stop; + + /* Window-exiting for INTs/NMIs. */ + bool int_window_exit; + bool nmi_window_exit; + + /* The guest is in an interrupt shadow (POP SS, etc). */ + bool int_shadow; +}; + +struct qemu_machine { + struct nvmm_capability cap; + struct nvmm_machine mach; +}; + +/* -------------------------------------------------------------------------- */ + +static bool nvmm_allowed; +static struct qemu_machine qemu_mach; + +static struct qemu_vcpu * +get_qemu_vcpu(CPUState *cpu) +{ + return (struct qemu_vcpu *)cpu->hax_vcpu; +} + +static struct nvmm_machine * +get_nvmm_mach(void) +{ + return &qemu_mach.mach; +} + +/* -------------------------------------------------------------------------- */ + +static void +nvmm_set_segment(struct nvmm_x64_state_seg *nseg, const SegmentCache *qseg) +{ + uint32_t attrib = qseg->flags; + + nseg->selector = qseg->selector; + nseg->limit = qseg->limit; + nseg->base = qseg->base; + nseg->attrib.type = __SHIFTOUT(attrib, DESC_TYPE_MASK); + nseg->attrib.s = __SHIFTOUT(attrib, DESC_S_MASK); + nseg->attrib.dpl = __SHIFTOUT(attrib, DESC_DPL_MASK); + nseg->attrib.p = __SHIFTOUT(attrib, DESC_P_MASK); + nseg->attrib.avl = __SHIFTOUT(attrib, DESC_AVL_MASK); + nseg->attrib.l = __SHIFTOUT(attrib, DESC_L_MASK); + nseg->attrib.def = __SHIFTOUT(attrib, DESC_B_MASK); + nseg->attrib.g = __SHIFTOUT(attrib, DESC_G_MASK); +} + +static void +nvmm_set_registers(CPUState *cpu) +{ + struct CPUX86State *env = (CPUArchState *)cpu->env_ptr; + struct nvmm_machine *mach = get_nvmm_mach(); + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + struct nvmm_x64_state *state = vcpu->state; + uint64_t bitmap; + size_t i; + int ret; + + assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu)); + + /* GPRs. */ + state->gprs[NVMM_X64_GPR_RAX] = env->regs[R_EAX]; + state->gprs[NVMM_X64_GPR_RCX] = env->regs[R_ECX]; + state->gprs[NVMM_X64_GPR_RDX] = env->regs[R_EDX]; + state->gprs[NVMM_X64_GPR_RBX] = env->regs[R_EBX]; + state->gprs[NVMM_X64_GPR_RSP] = env->regs[R_ESP]; + state->gprs[NVMM_X64_GPR_RBP] = env->regs[R_EBP]; + state->gprs[NVMM_X64_GPR_RSI] = env->regs[R_ESI]; + state->gprs[NVMM_X64_GPR_RDI] = env->regs[R_EDI]; +#ifdef TARGET_X86_64 + state->gprs[NVMM_X64_GPR_R8] = env->regs[R_R8]; + state->gprs[NVMM_X64_GPR_R9] = env->regs[R_R9]; + state->gprs[NVMM_X64_GPR_R10] = env->regs[R_R10]; + state->gprs[NVMM_X64_GPR_R11] = env->regs[R_R11]; + state->gprs[NVMM_X64_GPR_R12] = env->regs[R_R12]; + state->gprs[NVMM_X64_GPR_R13] = env->regs[R_R13]; + state->gprs[NVMM_X64_GPR_R14] = env->regs[R_R14]; + state->gprs[NVMM_X64_GPR_R15] = env->regs[R_R15]; +#endif + + /* RIP and RFLAGS. */ + state->gprs[NVMM_X64_GPR_RIP] = env->eip; + state->gprs[NVMM_X64_GPR_RFLAGS] = env->eflags; + + /* Segments. */ + nvmm_set_segment(&state->segs[NVMM_X64_SEG_CS], &env->segs[R_CS]); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_DS], &env->segs[R_DS]); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_ES], &env->segs[R_ES]); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_FS], &env->segs[R_FS]); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_GS], &env->segs[R_GS]); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_SS], &env->segs[R_SS]); + + /* Special segments. */ + nvmm_set_segment(&state->segs[NVMM_X64_SEG_GDT], &env->gdt); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_LDT], &env->ldt); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_TR], &env->tr); + nvmm_set_segment(&state->segs[NVMM_X64_SEG_IDT], &env->idt); + + /* Control registers. */ + state->crs[NVMM_X64_CR_CR0] = env->cr[0]; + state->crs[NVMM_X64_CR_CR2] = env->cr[2]; + state->crs[NVMM_X64_CR_CR3] = env->cr[3]; + state->crs[NVMM_X64_CR_CR4] = env->cr[4]; + state->crs[NVMM_X64_CR_CR8] = qcpu->tpr; + state->crs[NVMM_X64_CR_XCR0] = env->xcr0; + + /* Debug registers. */ + state->drs[NVMM_X64_DR_DR0] = env->dr[0]; + state->drs[NVMM_X64_DR_DR1] = env->dr[1]; + state->drs[NVMM_X64_DR_DR2] = env->dr[2]; + state->drs[NVMM_X64_DR_DR3] = env->dr[3]; + state->drs[NVMM_X64_DR_DR6] = env->dr[6]; + state->drs[NVMM_X64_DR_DR7] = env->dr[7]; + + /* FPU. */ + state->fpu.fx_cw = env->fpuc; + state->fpu.fx_sw = (env->fpus & ~0x3800) | ((env->fpstt & 0x7) << 11); + state->fpu.fx_tw = 0; + for (i = 0; i < 8; i++) { + state->fpu.fx_tw |= (!env->fptags[i]) << i; + } + state->fpu.fx_opcode = env->fpop; + state->fpu.fx_ip.fa_64 = env->fpip; + state->fpu.fx_dp.fa_64 = env->fpdp; + state->fpu.fx_mxcsr = env->mxcsr; + state->fpu.fx_mxcsr_mask = 0x0000FFFF; + assert(sizeof(state->fpu.fx_87_ac) == sizeof(env->fpregs)); + memcpy(state->fpu.fx_87_ac, env->fpregs, sizeof(env->fpregs)); + for (i = 0; i < CPU_NB_REGS; i++) { + memcpy(&state->fpu.fx_xmm[i].xmm_bytes[0], + &env->xmm_regs[i].ZMM_Q(0), 8); + memcpy(&state->fpu.fx_xmm[i].xmm_bytes[8], + &env->xmm_regs[i].ZMM_Q(1), 8); + } + + /* MSRs. */ + state->msrs[NVMM_X64_MSR_EFER] = env->efer; + state->msrs[NVMM_X64_MSR_STAR] = env->star; +#ifdef TARGET_X86_64 + state->msrs[NVMM_X64_MSR_LSTAR] = env->lstar; + state->msrs[NVMM_X64_MSR_CSTAR] = env->cstar; + state->msrs[NVMM_X64_MSR_SFMASK] = env->fmask; + state->msrs[NVMM_X64_MSR_KERNELGSBASE] = env->kernelgsbase; +#endif + state->msrs[NVMM_X64_MSR_SYSENTER_CS] = env->sysenter_cs; + state->msrs[NVMM_X64_MSR_SYSENTER_ESP] = env->sysenter_esp; + state->msrs[NVMM_X64_MSR_SYSENTER_EIP] = env->sysenter_eip; + state->msrs[NVMM_X64_MSR_PAT] = env->pat; + state->msrs[NVMM_X64_MSR_TSC] = env->tsc; + + bitmap = + NVMM_X64_STATE_SEGS | + NVMM_X64_STATE_GPRS | + NVMM_X64_STATE_CRS | + NVMM_X64_STATE_DRS | + NVMM_X64_STATE_MSRS | + NVMM_X64_STATE_FPU; + + ret = nvmm_vcpu_setstate(mach, vcpu, bitmap); + if (ret == -1) { + error_report("NVMM: Failed to set virtual processor context," + " error=%d", errno); + } +} + +static void +nvmm_get_segment(SegmentCache *qseg, const struct nvmm_x64_state_seg *nseg) +{ + qseg->selector = nseg->selector; + qseg->limit = nseg->limit; + qseg->base = nseg->base; + + qseg->flags = + __SHIFTIN((uint32_t)nseg->attrib.type, DESC_TYPE_MASK) | + __SHIFTIN((uint32_t)nseg->attrib.s, DESC_S_MASK) | + __SHIFTIN((uint32_t)nseg->attrib.dpl, DESC_DPL_MASK) | + __SHIFTIN((uint32_t)nseg->attrib.p, DESC_P_MASK) | + __SHIFTIN((uint32_t)nseg->attrib.avl, DESC_AVL_MASK) | + __SHIFTIN((uint32_t)nseg->attrib.l, DESC_L_MASK) | + __SHIFTIN((uint32_t)nseg->attrib.def, DESC_B_MASK) | + __SHIFTIN((uint32_t)nseg->attrib.g, DESC_G_MASK); +} + +static void +nvmm_get_registers(CPUState *cpu) +{ + struct CPUX86State *env = (CPUArchState *)cpu->env_ptr; + struct nvmm_machine *mach = get_nvmm_mach(); + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + X86CPU *x86_cpu = X86_CPU(cpu); + struct nvmm_x64_state *state = vcpu->state; + uint64_t bitmap, tpr; + size_t i; + int ret; + + assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu)); + + bitmap = + NVMM_X64_STATE_SEGS | + NVMM_X64_STATE_GPRS | + NVMM_X64_STATE_CRS | + NVMM_X64_STATE_DRS | + NVMM_X64_STATE_MSRS | + NVMM_X64_STATE_FPU; + + ret = nvmm_vcpu_getstate(mach, vcpu, bitmap); + if (ret == -1) { + error_report("NVMM: Failed to get virtual processor context," + " error=%d", errno); + } + + /* GPRs. */ + env->regs[R_EAX] = state->gprs[NVMM_X64_GPR_RAX]; + env->regs[R_ECX] = state->gprs[NVMM_X64_GPR_RCX]; + env->regs[R_EDX] = state->gprs[NVMM_X64_GPR_RDX]; + env->regs[R_EBX] = state->gprs[NVMM_X64_GPR_RBX]; + env->regs[R_ESP] = state->gprs[NVMM_X64_GPR_RSP]; + env->regs[R_EBP] = state->gprs[NVMM_X64_GPR_RBP]; + env->regs[R_ESI] = state->gprs[NVMM_X64_GPR_RSI]; + env->regs[R_EDI] = state->gprs[NVMM_X64_GPR_RDI]; +#ifdef TARGET_X86_64 + env->regs[R_R8] = state->gprs[NVMM_X64_GPR_R8]; + env->regs[R_R9] = state->gprs[NVMM_X64_GPR_R9]; + env->regs[R_R10] = state->gprs[NVMM_X64_GPR_R10]; + env->regs[R_R11] = state->gprs[NVMM_X64_GPR_R11]; + env->regs[R_R12] = state->gprs[NVMM_X64_GPR_R12]; + env->regs[R_R13] = state->gprs[NVMM_X64_GPR_R13]; + env->regs[R_R14] = state->gprs[NVMM_X64_GPR_R14]; + env->regs[R_R15] = state->gprs[NVMM_X64_GPR_R15]; +#endif + + /* RIP and RFLAGS. */ + env->eip = state->gprs[NVMM_X64_GPR_RIP]; + env->eflags = state->gprs[NVMM_X64_GPR_RFLAGS]; + + /* Segments. */ + nvmm_get_segment(&env->segs[R_ES], &state->segs[NVMM_X64_SEG_ES]); + nvmm_get_segment(&env->segs[R_CS], &state->segs[NVMM_X64_SEG_CS]); + nvmm_get_segment(&env->segs[R_SS], &state->segs[NVMM_X64_SEG_SS]); + nvmm_get_segment(&env->segs[R_DS], &state->segs[NVMM_X64_SEG_DS]); + nvmm_get_segment(&env->segs[R_FS], &state->segs[NVMM_X64_SEG_FS]); + nvmm_get_segment(&env->segs[R_GS], &state->segs[NVMM_X64_SEG_GS]); + + /* Special segments. */ + nvmm_get_segment(&env->gdt, &state->segs[NVMM_X64_SEG_GDT]); + nvmm_get_segment(&env->ldt, &state->segs[NVMM_X64_SEG_LDT]); + nvmm_get_segment(&env->tr, &state->segs[NVMM_X64_SEG_TR]); + nvmm_get_segment(&env->idt, &state->segs[NVMM_X64_SEG_IDT]); + + /* Control registers. */ + env->cr[0] = state->crs[NVMM_X64_CR_CR0]; + env->cr[2] = state->crs[NVMM_X64_CR_CR2]; + env->cr[3] = state->crs[NVMM_X64_CR_CR3]; + env->cr[4] = state->crs[NVMM_X64_CR_CR4]; + tpr = state->crs[NVMM_X64_CR_CR8]; + if (tpr != qcpu->tpr) { + qcpu->tpr = tpr; + cpu_set_apic_tpr(x86_cpu->apic_state, tpr); + } + env->xcr0 = state->crs[NVMM_X64_CR_XCR0]; + + /* Debug registers. */ + env->dr[0] = state->drs[NVMM_X64_DR_DR0]; + env->dr[1] = state->drs[NVMM_X64_DR_DR1]; + env->dr[2] = state->drs[NVMM_X64_DR_DR2]; + env->dr[3] = state->drs[NVMM_X64_DR_DR3]; + env->dr[6] = state->drs[NVMM_X64_DR_DR6]; + env->dr[7] = state->drs[NVMM_X64_DR_DR7]; + + /* FPU. */ + env->fpuc = state->fpu.fx_cw; + env->fpstt = (state->fpu.fx_sw >> 11) & 0x7; + env->fpus = state->fpu.fx_sw & ~0x3800; + for (i = 0; i < 8; i++) { + env->fptags[i] = !((state->fpu.fx_tw >> i) & 1); + } + env->fpop = state->fpu.fx_opcode; + env->fpip = state->fpu.fx_ip.fa_64; + env->fpdp = state->fpu.fx_dp.fa_64; + env->mxcsr = state->fpu.fx_mxcsr; + assert(sizeof(state->fpu.fx_87_ac) == sizeof(env->fpregs)); + memcpy(env->fpregs, state->fpu.fx_87_ac, sizeof(env->fpregs)); + for (i = 0; i < CPU_NB_REGS; i++) { + memcpy(&env->xmm_regs[i].ZMM_Q(0), + &state->fpu.fx_xmm[i].xmm_bytes[0], 8); + memcpy(&env->xmm_regs[i].ZMM_Q(1), + &state->fpu.fx_xmm[i].xmm_bytes[8], 8); + } + + /* MSRs. */ + env->efer = state->msrs[NVMM_X64_MSR_EFER]; + env->star = state->msrs[NVMM_X64_MSR_STAR]; +#ifdef TARGET_X86_64 + env->lstar = state->msrs[NVMM_X64_MSR_LSTAR]; + env->cstar = state->msrs[NVMM_X64_MSR_CSTAR]; + env->fmask = state->msrs[NVMM_X64_MSR_SFMASK]; + env->kernelgsbase = state->msrs[NVMM_X64_MSR_KERNELGSBASE]; +#endif + env->sysenter_cs = state->msrs[NVMM_X64_MSR_SYSENTER_CS]; + env->sysenter_esp = state->msrs[NVMM_X64_MSR_SYSENTER_ESP]; + env->sysenter_eip = state->msrs[NVMM_X64_MSR_SYSENTER_EIP]; + env->pat = state->msrs[NVMM_X64_MSR_PAT]; + env->tsc = state->msrs[NVMM_X64_MSR_TSC]; + + x86_update_hflags(env); +} + +static bool +nvmm_can_take_int(CPUState *cpu) +{ + struct CPUX86State *env = (CPUArchState *)cpu->env_ptr; + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + struct nvmm_machine *mach = get_nvmm_mach(); + + if (qcpu->int_window_exit) { + return false; + } + + if (qcpu->int_shadow || !(env->eflags & IF_MASK)) { + struct nvmm_x64_state *state = vcpu->state; + + /* Exit on interrupt window. */ + nvmm_vcpu_getstate(mach, vcpu, NVMM_X64_STATE_INTR); + state->intr.int_window_exiting = 1; + nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_INTR); + + return false; + } + + return true; +} + +static bool +nvmm_can_take_nmi(CPUState *cpu) +{ + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + + /* + * Contrary to INTs, NMIs always schedule an exit when they are + * completed. Therefore, if window-exiting is enabled, it means + * NMIs are blocked. + */ + if (qcpu->nmi_window_exit) { + return false; + } + + return true; +} + +/* + * Called before the VCPU is run. We inject events generated by the I/O + * thread, and synchronize the guest TPR. + */ +static void +nvmm_vcpu_pre_run(CPUState *cpu) +{ + struct CPUX86State *env = (CPUArchState *)cpu->env_ptr; + struct nvmm_machine *mach = get_nvmm_mach(); + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + X86CPU *x86_cpu = X86_CPU(cpu); + struct nvmm_x64_state *state = vcpu->state; + struct nvmm_vcpu_event *event = vcpu->event; + bool has_event = false; + bool sync_tpr = false; + uint8_t tpr; + int ret; + + qemu_mutex_lock_iothread(); + + tpr = cpu_get_apic_tpr(x86_cpu->apic_state); + if (tpr != qcpu->tpr) { + qcpu->tpr = tpr; + sync_tpr = true; + } + + /* + * Force the VCPU out of its inner loop to process any INIT requests + * or commit pending TPR access. + */ + if (cpu->interrupt_request & (CPU_INTERRUPT_INIT | CPU_INTERRUPT_TPR)) { + cpu->exit_request = 1; + } + + if (!has_event && (cpu->interrupt_request & CPU_INTERRUPT_NMI)) { + if (nvmm_can_take_nmi(cpu)) { + cpu->interrupt_request &= ~CPU_INTERRUPT_NMI; + event->type = NVMM_VCPU_EVENT_INTR; + event->vector = 2; + has_event = true; + } + } + + if (!has_event && (cpu->interrupt_request & CPU_INTERRUPT_HARD)) { + if (nvmm_can_take_int(cpu)) { + cpu->interrupt_request &= ~CPU_INTERRUPT_HARD; + event->type = NVMM_VCPU_EVENT_INTR; + event->vector = cpu_get_pic_interrupt(env); + has_event = true; + } + } + + /* Don't want SMIs. */ + if (cpu->interrupt_request & CPU_INTERRUPT_SMI) { + cpu->interrupt_request &= ~CPU_INTERRUPT_SMI; + } + + if (sync_tpr) { + ret = nvmm_vcpu_getstate(mach, vcpu, NVMM_X64_STATE_CRS); + if (ret == -1) { + error_report("NVMM: Failed to get CPU state," + " error=%d", errno); + } + + state->crs[NVMM_X64_CR_CR8] = qcpu->tpr; + + ret = nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_CRS); + if (ret == -1) { + error_report("NVMM: Failed to set CPU state," + " error=%d", errno); + } + } + + if (has_event) { + ret = nvmm_vcpu_inject(mach, vcpu); + if (ret == -1) { + error_report("NVMM: Failed to inject event," + " error=%d", errno); + } + } + + qemu_mutex_unlock_iothread(); +} + +/* + * Called after the VCPU ran. We synchronize the host view of the TPR and + * RFLAGS. + */ +static void +nvmm_vcpu_post_run(CPUState *cpu, struct nvmm_vcpu_exit *exit) +{ + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct CPUX86State *env = (CPUArchState *)cpu->env_ptr; + X86CPU *x86_cpu = X86_CPU(cpu); + uint64_t tpr; + + env->eflags = exit->exitstate.rflags; + qcpu->int_shadow = exit->exitstate.int_shadow; + qcpu->int_window_exit = exit->exitstate.int_window_exiting; + qcpu->nmi_window_exit = exit->exitstate.nmi_window_exiting; + + tpr = exit->exitstate.cr8; + if (qcpu->tpr != tpr) { + qcpu->tpr = tpr; + qemu_mutex_lock_iothread(); + cpu_set_apic_tpr(x86_cpu->apic_state, qcpu->tpr); + qemu_mutex_unlock_iothread(); + } +} + +/* -------------------------------------------------------------------------- */ + +static void +nvmm_io_callback(struct nvmm_io *io) +{ + MemTxAttrs attrs = { 0 }; + int ret; + + ret = address_space_rw(&address_space_io, io->port, attrs, io->data, + io->size, !io->in); + if (ret != MEMTX_OK) { + error_report("NVMM: I/O Transaction Failed " + "[%s, port=%u, size=%zu]", (io->in ? "in" : "out"), + io->port, io->size); + } + + /* Needed, otherwise infinite loop. */ + current_cpu->vcpu_dirty = false; +} + +static void +nvmm_mem_callback(struct nvmm_mem *mem) +{ + cpu_physical_memory_rw(mem->gpa, mem->data, mem->size, mem->write); + + /* Needed, otherwise infinite loop. */ + current_cpu->vcpu_dirty = false; +} + +static struct nvmm_assist_callbacks nvmm_callbacks = { + .io = nvmm_io_callback, + .mem = nvmm_mem_callback +}; + +/* -------------------------------------------------------------------------- */ + +static int +nvmm_handle_mem(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) +{ + int ret; + + ret = nvmm_assist_mem(mach, vcpu); + if (ret == -1) { + error_report("NVMM: Mem Assist Failed [gpa=%p]", + (void *)vcpu->exit->u.mem.gpa); + } + + return ret; +} + +static int +nvmm_handle_io(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) +{ + int ret; + + ret = nvmm_assist_io(mach, vcpu); + if (ret == -1) { + error_report("NVMM: I/O Assist Failed [port=%d]", + (int)vcpu->exit->u.io.port); + } + + return ret; +} + +static int +nvmm_handle_rdmsr(struct nvmm_machine *mach, CPUState *cpu, + struct nvmm_vcpu_exit *exit) +{ + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + X86CPU *x86_cpu = X86_CPU(cpu); + struct nvmm_x64_state *state = vcpu->state; + uint64_t val; + int ret; + + switch (exit->u.rdmsr.msr) { + case MSR_IA32_APICBASE: + val = cpu_get_apic_base(x86_cpu->apic_state); + break; + case MSR_MTRRcap: + case MSR_MTRRdefType: + case MSR_MCG_CAP: + case MSR_MCG_STATUS: + val = 0; + break; + default: /* More MSRs to add? */ + val = 0; + error_report("NVMM: Unexpected RDMSR 0x%x, ignored", + exit->u.rdmsr.msr); + break; + } + + ret = nvmm_vcpu_getstate(mach, vcpu, NVMM_X64_STATE_GPRS); + if (ret == -1) { + return -1; + } + + state->gprs[NVMM_X64_GPR_RAX] = (val & 0xFFFFFFFF); + state->gprs[NVMM_X64_GPR_RDX] = (val >> 32); + state->gprs[NVMM_X64_GPR_RIP] = exit->u.rdmsr.npc; + + ret = nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_GPRS); + if (ret == -1) { + return -1; + } + + return 0; +} + +static int +nvmm_handle_wrmsr(struct nvmm_machine *mach, CPUState *cpu, + struct nvmm_vcpu_exit *exit) +{ + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + X86CPU *x86_cpu = X86_CPU(cpu); + struct nvmm_x64_state *state = vcpu->state; + uint64_t val; + int ret; + + val = exit->u.wrmsr.val; + + switch (exit->u.wrmsr.msr) { + case MSR_IA32_APICBASE: + cpu_set_apic_base(x86_cpu->apic_state, val); + break; + case MSR_MTRRdefType: + case MSR_MCG_STATUS: + break; + default: /* More MSRs to add? */ + error_report("NVMM: Unexpected WRMSR 0x%x [val=0x%lx], ignored", + exit->u.wrmsr.msr, val); + break; + } + + ret = nvmm_vcpu_getstate(mach, vcpu, NVMM_X64_STATE_GPRS); + if (ret == -1) { + return -1; + } + + state->gprs[NVMM_X64_GPR_RIP] = exit->u.wrmsr.npc; + + ret = nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_GPRS); + if (ret == -1) { + return -1; + } + + return 0; +} + +static int +nvmm_handle_halted(struct nvmm_machine *mach, CPUState *cpu, + struct nvmm_vcpu_exit *exit) +{ + struct CPUX86State *env = (CPUArchState *)cpu->env_ptr; + int ret = 0; + + qemu_mutex_lock_iothread(); + + if (!((cpu->interrupt_request & CPU_INTERRUPT_HARD) && + (env->eflags & IF_MASK)) && + !(cpu->interrupt_request & CPU_INTERRUPT_NMI)) { + cpu->exception_index = EXCP_HLT; + cpu->halted = true; + ret = 1; + } + + qemu_mutex_unlock_iothread(); + + return ret; +} + +static int +nvmm_inject_ud(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) +{ + struct nvmm_vcpu_event *event = vcpu->event; + + event->type = NVMM_VCPU_EVENT_EXCP; + event->vector = 6; + event->u.excp.error = 0; + + return nvmm_vcpu_inject(mach, vcpu); +} + +static int +nvmm_vcpu_loop(CPUState *cpu) +{ + struct CPUX86State *env = (CPUArchState *)cpu->env_ptr; + struct nvmm_machine *mach = get_nvmm_mach(); + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + X86CPU *x86_cpu = X86_CPU(cpu); + struct nvmm_vcpu_exit *exit = vcpu->exit; + int ret; + + /* + * Some asynchronous events must be handled outside of the inner + * VCPU loop. They are handled here. + */ + if (cpu->interrupt_request & CPU_INTERRUPT_INIT) { + nvmm_cpu_synchronize_state(cpu); + do_cpu_init(x86_cpu); + /* set int/nmi windows back to the reset state */ + } + if (cpu->interrupt_request & CPU_INTERRUPT_POLL) { + cpu->interrupt_request &= ~CPU_INTERRUPT_POLL; + apic_poll_irq(x86_cpu->apic_state); + } + if (((cpu->interrupt_request & CPU_INTERRUPT_HARD) && + (env->eflags & IF_MASK)) || + (cpu->interrupt_request & CPU_INTERRUPT_NMI)) { + cpu->halted = false; + } + if (cpu->interrupt_request & CPU_INTERRUPT_SIPI) { + nvmm_cpu_synchronize_state(cpu); + do_cpu_sipi(x86_cpu); + } + if (cpu->interrupt_request & CPU_INTERRUPT_TPR) { + cpu->interrupt_request &= ~CPU_INTERRUPT_TPR; + nvmm_cpu_synchronize_state(cpu); + apic_handle_tpr_access_report(x86_cpu->apic_state, env->eip, + env->tpr_access_type); + } + + if (cpu->halted) { + cpu->exception_index = EXCP_HLT; + qatomic_set(&cpu->exit_request, false); + return 0; + } + + qemu_mutex_unlock_iothread(); + cpu_exec_start(cpu); + + /* + * Inner VCPU loop. + */ + do { + if (cpu->vcpu_dirty) { + nvmm_set_registers(cpu); + cpu->vcpu_dirty = false; + } + + if (qcpu->stop) { + cpu->exception_index = EXCP_INTERRUPT; + qcpu->stop = false; + ret = 1; + break; + } + + nvmm_vcpu_pre_run(cpu); + + if (qatomic_read(&cpu->exit_request)) { + nvmm_vcpu_stop(vcpu); + } + + /* Read exit_request before the kernel reads the immediate exit flag */ + smp_rmb(); + ret = nvmm_vcpu_run(mach, vcpu); + if (ret == -1) { + error_report("NVMM: Failed to exec a virtual processor," + " error=%d", errno); + break; + } + + nvmm_vcpu_post_run(cpu, exit); + + switch (exit->reason) { + case NVMM_VCPU_EXIT_NONE: + break; + case NVMM_VCPU_EXIT_STOPPED: + /* + * The kernel cleared the immediate exit flag; cpu->exit_request + * must be cleared after + */ + smp_wmb(); + qcpu->stop = true; + break; + case NVMM_VCPU_EXIT_MEMORY: + ret = nvmm_handle_mem(mach, vcpu); + break; + case NVMM_VCPU_EXIT_IO: + ret = nvmm_handle_io(mach, vcpu); + break; + case NVMM_VCPU_EXIT_INT_READY: + case NVMM_VCPU_EXIT_NMI_READY: + case NVMM_VCPU_EXIT_TPR_CHANGED: + break; + case NVMM_VCPU_EXIT_HALTED: + ret = nvmm_handle_halted(mach, cpu, exit); + break; + case NVMM_VCPU_EXIT_SHUTDOWN: + qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); + cpu->exception_index = EXCP_INTERRUPT; + ret = 1; + break; + case NVMM_VCPU_EXIT_RDMSR: + ret = nvmm_handle_rdmsr(mach, cpu, exit); + break; + case NVMM_VCPU_EXIT_WRMSR: + ret = nvmm_handle_wrmsr(mach, cpu, exit); + break; + case NVMM_VCPU_EXIT_MONITOR: + case NVMM_VCPU_EXIT_MWAIT: + ret = nvmm_inject_ud(mach, vcpu); + break; + default: + error_report("NVMM: Unexpected VM exit code 0x%lx [hw=0x%lx]", + exit->reason, exit->u.inv.hwcode); + nvmm_get_registers(cpu); + qemu_mutex_lock_iothread(); + qemu_system_guest_panicked(cpu_get_crash_info(cpu)); + qemu_mutex_unlock_iothread(); + ret = -1; + break; + } + } while (ret == 0); + + cpu_exec_end(cpu); + qemu_mutex_lock_iothread(); + + qatomic_set(&cpu->exit_request, false); + + return ret < 0; +} + +/* -------------------------------------------------------------------------- */ + +static void +do_nvmm_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg) +{ + nvmm_get_registers(cpu); + cpu->vcpu_dirty = true; +} + +static void +do_nvmm_cpu_synchronize_post_reset(CPUState *cpu, run_on_cpu_data arg) +{ + nvmm_set_registers(cpu); + cpu->vcpu_dirty = false; +} + +static void +do_nvmm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg) +{ + nvmm_set_registers(cpu); + cpu->vcpu_dirty = false; +} + +static void +do_nvmm_cpu_synchronize_pre_loadvm(CPUState *cpu, run_on_cpu_data arg) +{ + cpu->vcpu_dirty = true; +} + +void nvmm_cpu_synchronize_state(CPUState *cpu) +{ + if (!cpu->vcpu_dirty) { + run_on_cpu(cpu, do_nvmm_cpu_synchronize_state, RUN_ON_CPU_NULL); + } +} + +void nvmm_cpu_synchronize_post_reset(CPUState *cpu) +{ + run_on_cpu(cpu, do_nvmm_cpu_synchronize_post_reset, RUN_ON_CPU_NULL); +} + +void nvmm_cpu_synchronize_post_init(CPUState *cpu) +{ + run_on_cpu(cpu, do_nvmm_cpu_synchronize_post_init, RUN_ON_CPU_NULL); +} + +void nvmm_cpu_synchronize_pre_loadvm(CPUState *cpu) +{ + run_on_cpu(cpu, do_nvmm_cpu_synchronize_pre_loadvm, RUN_ON_CPU_NULL); +} + +/* -------------------------------------------------------------------------- */ + +static Error *nvmm_migration_blocker; + +/* + * The nvmm_vcpu_stop() mechanism breaks races between entering the VMM + * and another thread signaling the vCPU thread to exit. + */ + +static void +nvmm_ipi_signal(int sigcpu) +{ + if (current_cpu) { + struct qemu_vcpu *qcpu = get_qemu_vcpu(current_cpu); + struct nvmm_vcpu *vcpu = &qcpu->vcpu; + nvmm_vcpu_stop(vcpu); + } +} + +static void +nvmm_init_cpu_signals(void) +{ + struct sigaction sigact; + sigset_t set; + + /* Install the IPI handler. */ + memset(&sigact, 0, sizeof(sigact)); + sigact.sa_handler = nvmm_ipi_signal; + sigaction(SIG_IPI, &sigact, NULL); + + /* Allow IPIs on the current thread. */ + sigprocmask(SIG_BLOCK, NULL, &set); + sigdelset(&set, SIG_IPI); + pthread_sigmask(SIG_SETMASK, &set, NULL); +} + +int +nvmm_init_vcpu(CPUState *cpu) +{ + struct nvmm_machine *mach = get_nvmm_mach(); + struct nvmm_vcpu_conf_cpuid cpuid; + struct nvmm_vcpu_conf_tpr tpr; + Error *local_error = NULL; + struct qemu_vcpu *qcpu; + int ret, err; + + nvmm_init_cpu_signals(); + + if (nvmm_migration_blocker == NULL) { + error_setg(&nvmm_migration_blocker, + "NVMM: Migration not supported"); + + (void)migrate_add_blocker(nvmm_migration_blocker, &local_error); + if (local_error) { + error_report_err(local_error); + migrate_del_blocker(nvmm_migration_blocker); + error_free(nvmm_migration_blocker); + return -EINVAL; + } + } + + qcpu = g_malloc0(sizeof(*qcpu)); + if (qcpu == NULL) { + error_report("NVMM: Failed to allocate VCPU context."); + return -ENOMEM; + } + + ret = nvmm_vcpu_create(mach, cpu->cpu_index, &qcpu->vcpu); + if (ret == -1) { + err = errno; + error_report("NVMM: Failed to create a virtual processor," + " error=%d", err); + g_free(qcpu); + return -err; + } + + memset(&cpuid, 0, sizeof(cpuid)); + cpuid.mask = 1; + cpuid.leaf = 0x00000001; + cpuid.u.mask.set.edx = CPUID_MCE | CPUID_MCA | CPUID_MTRR; + ret = nvmm_vcpu_configure(mach, &qcpu->vcpu, NVMM_VCPU_CONF_CPUID, + &cpuid); + if (ret == -1) { + err = errno; + error_report("NVMM: Failed to configure a virtual processor," + " error=%d", err); + g_free(qcpu); + return -err; + } + + ret = nvmm_vcpu_configure(mach, &qcpu->vcpu, NVMM_VCPU_CONF_CALLBACKS, + &nvmm_callbacks); + if (ret == -1) { + err = errno; + error_report("NVMM: Failed to configure a virtual processor," + " error=%d", err); + g_free(qcpu); + return -err; + } + + if (qemu_mach.cap.arch.vcpu_conf_support & NVMM_CAP_ARCH_VCPU_CONF_TPR) { + memset(&tpr, 0, sizeof(tpr)); + tpr.exit_changed = 1; + ret = nvmm_vcpu_configure(mach, &qcpu->vcpu, NVMM_VCPU_CONF_TPR, &tpr); + if (ret == -1) { + err = errno; + error_report("NVMM: Failed to configure a virtual processor," + " error=%d", err); + g_free(qcpu); + return -err; + } + } + + cpu->vcpu_dirty = true; + cpu->hax_vcpu = (struct hax_vcpu_state *)qcpu; + + return 0; +} + +int +nvmm_vcpu_exec(CPUState *cpu) +{ + int ret, fatal; + + while (1) { + if (cpu->exception_index >= EXCP_INTERRUPT) { + ret = cpu->exception_index; + cpu->exception_index = -1; + break; + } + + fatal = nvmm_vcpu_loop(cpu); + + if (fatal) { + error_report("NVMM: Failed to execute a VCPU."); + abort(); + } + } + + return ret; +} + +void +nvmm_destroy_vcpu(CPUState *cpu) +{ + struct nvmm_machine *mach = get_nvmm_mach(); + struct qemu_vcpu *qcpu = get_qemu_vcpu(cpu); + + nvmm_vcpu_destroy(mach, &qcpu->vcpu); + g_free(cpu->hax_vcpu); +} + +/* -------------------------------------------------------------------------- */ + +static void +nvmm_update_mapping(hwaddr start_pa, ram_addr_t size, uintptr_t hva, + bool add, bool rom, const char *name) +{ + struct nvmm_machine *mach = get_nvmm_mach(); + int ret, prot; + + if (add) { + prot = PROT_READ | PROT_EXEC; + if (!rom) { + prot |= PROT_WRITE; + } + ret = nvmm_gpa_map(mach, hva, start_pa, size, prot); + } else { + ret = nvmm_gpa_unmap(mach, hva, start_pa, size); + } + + if (ret == -1) { + error_report("NVMM: Failed to %s GPA range '%s' PA:%p, " + "Size:%p bytes, HostVA:%p, error=%d", + (add ? "map" : "unmap"), name, (void *)(uintptr_t)start_pa, + (void *)size, (void *)hva, errno); + } +} + +static void +nvmm_process_section(MemoryRegionSection *section, int add) +{ + MemoryRegion *mr = section->mr; + hwaddr start_pa = section->offset_within_address_space; + ram_addr_t size = int128_get64(section->size); + unsigned int delta; + uintptr_t hva; + + if (!memory_region_is_ram(mr)) { + return; + } + + /* Adjust start_pa and size so that they are page-aligned. */ + delta = qemu_real_host_page_size - (start_pa & ~qemu_real_host_page_mask); + delta &= ~qemu_real_host_page_mask; + if (delta > size) { + return; + } + start_pa += delta; + size -= delta; + size &= qemu_real_host_page_mask; + if (!size || (start_pa & ~qemu_real_host_page_mask)) { + return; + } + + hva = (uintptr_t)memory_region_get_ram_ptr(mr) + + section->offset_within_region + delta; + + nvmm_update_mapping(start_pa, size, hva, add, + memory_region_is_rom(mr), mr->name); +} + +static void +nvmm_region_add(MemoryListener *listener, MemoryRegionSection *section) +{ + memory_region_ref(section->mr); + nvmm_process_section(section, 1); +} + +static void +nvmm_region_del(MemoryListener *listener, MemoryRegionSection *section) +{ + nvmm_process_section(section, 0); + memory_region_unref(section->mr); +} + +static void +nvmm_transaction_begin(MemoryListener *listener) +{ + /* nothing */ +} + +static void +nvmm_transaction_commit(MemoryListener *listener) +{ + /* nothing */ +} + +static void +nvmm_log_sync(MemoryListener *listener, MemoryRegionSection *section) +{ + MemoryRegion *mr = section->mr; + + if (!memory_region_is_ram(mr)) { + return; + } + + memory_region_set_dirty(mr, 0, int128_get64(section->size)); +} + +static MemoryListener nvmm_memory_listener = { + .begin = nvmm_transaction_begin, + .commit = nvmm_transaction_commit, + .region_add = nvmm_region_add, + .region_del = nvmm_region_del, + .log_sync = nvmm_log_sync, + .priority = 10, +}; + +static void +nvmm_ram_block_added(RAMBlockNotifier *n, void *host, size_t size) +{ + struct nvmm_machine *mach = get_nvmm_mach(); + uintptr_t hva = (uintptr_t)host; + int ret; + + ret = nvmm_hva_map(mach, hva, size); + + if (ret == -1) { + error_report("NVMM: Failed to map HVA, HostVA:%p " + "Size:%p bytes, error=%d", + (void *)hva, (void *)size, errno); + } +} + +static struct RAMBlockNotifier nvmm_ram_notifier = { + .ram_block_added = nvmm_ram_block_added +}; + +/* -------------------------------------------------------------------------- */ + +static int +nvmm_accel_init(MachineState *ms) +{ + int ret, err; + + ret = nvmm_init(); + if (ret == -1) { + err = errno; + error_report("NVMM: Initialization failed, error=%d", errno); + return -err; + } + + ret = nvmm_capability(&qemu_mach.cap); + if (ret == -1) { + err = errno; + error_report("NVMM: Unable to fetch capability, error=%d", errno); + return -err; + } + if (qemu_mach.cap.version < NVMM_KERN_VERSION) { + error_report("NVMM: Unsupported version %u", qemu_mach.cap.version); + return -EPROGMISMATCH; + } + if (qemu_mach.cap.state_size != sizeof(struct nvmm_x64_state)) { + error_report("NVMM: Wrong state size %u", qemu_mach.cap.state_size); + return -EPROGMISMATCH; + } + + ret = nvmm_machine_create(&qemu_mach.mach); + if (ret == -1) { + err = errno; + error_report("NVMM: Machine creation failed, error=%d", errno); + return -err; + } + + memory_listener_register(&nvmm_memory_listener, &address_space_memory); + ram_block_notifier_add(&nvmm_ram_notifier); + + printf("NetBSD Virtual Machine Monitor accelerator is operational\n"); + return 0; +} + +int +nvmm_enabled(void) +{ + return nvmm_allowed; +} + +static void +nvmm_accel_class_init(ObjectClass *oc, void *data) +{ + AccelClass *ac = ACCEL_CLASS(oc); + ac->name = "NVMM"; + ac->init_machine = nvmm_accel_init; + ac->allowed = &nvmm_allowed; +} + +static const TypeInfo nvmm_accel_type = { + .name = ACCEL_CLASS_NAME("nvmm"), + .parent = TYPE_ACCEL, + .class_init = nvmm_accel_class_init, +}; + +static void +nvmm_type_init(void) +{ + type_register_static(&nvmm_accel_type); +} + +type_init(nvmm_type_init); |