| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/virtualization/bin/vmm/vcpu.h" |
| |
| #include <lib/fit/defer.h> |
| #include <lib/fit/function.h> |
| #include <lib/syslog/cpp/macros.h> |
| #include <lib/trace/event.h> |
| #include <lib/zx/thread.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <zircon/process.h> |
| #include <zircon/syscalls.h> |
| #include <zircon/syscalls/hypervisor.h> |
| #include <zircon/syscalls/port.h> |
| |
| #include "src/lib/fxl/strings/string_printf.h" |
| #include "src/virtualization/bin/vmm/guest.h" |
| #include "src/virtualization/bin/vmm/io.h" |
| |
| static thread_local Vcpu* thread_vcpu = nullptr; |
| |
| #if __aarch64__ |
| static zx_status_t HandleMemArm(const zx_packet_guest_mem_t& mem, uint64_t trap_key, |
| uint64_t* reg) { |
| TRACE_DURATION("machina", "mmio", "addr", mem.addr, "access_size", mem.access_size); |
| |
| IoValue mmio = {mem.access_size, {.u64 = mem.data}}; |
| IoMapping* mapping = IoMapping::FromPortKey(trap_key); |
| if (!mem.read) { |
| return mapping->Write(mem.addr, mmio); |
| } |
| |
| zx_status_t status = mapping->Read(mem.addr, &mmio); |
| if (status != ZX_OK) { |
| return status; |
| } |
| *reg = mmio.u64; |
| if (mem.sign_extend && *reg & (1ul << (mmio.access_size * CHAR_BIT - 1))) { |
| *reg |= UINT64_MAX << mmio.access_size; |
| } |
| return ZX_OK; |
| } |
| #elif __x86_64__ |
| #include "src/virtualization/bin/vmm/arch/x64/decode.h" |
| |
| static zx_status_t HandleMemX86(const zx_packet_guest_mem_t& mem, uint64_t trap_key, |
| const Instruction* inst) { |
| TRACE_DURATION("machina", "mmio", "addr", mem.addr, "access_size", inst->access_size); |
| |
| zx_status_t status; |
| IoValue mmio = {inst->access_size, {.u64 = 0}}; |
| switch (inst->type) { |
| case INST_MOV_WRITE: |
| switch (inst->access_size) { |
| case 1: |
| status = inst_write8(inst, &mmio.u8); |
| break; |
| case 2: |
| status = inst_write16(inst, &mmio.u16); |
| break; |
| case 4: |
| status = inst_write32(inst, &mmio.u32); |
| break; |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| if (status != ZX_OK) { |
| return status; |
| } |
| return IoMapping::FromPortKey(trap_key)->Write(mem.addr, mmio); |
| |
| case INST_MOV_READ: |
| status = IoMapping::FromPortKey(trap_key)->Read(mem.addr, &mmio); |
| if (status != ZX_OK) { |
| return status; |
| } |
| switch (inst->access_size) { |
| case 1: |
| return inst_read8(inst, mmio.u8); |
| case 2: |
| return inst_read16(inst, mmio.u16); |
| case 4: |
| return inst_read32(inst, mmio.u32); |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| |
| case INST_TEST: |
| status = IoMapping::FromPortKey(trap_key)->Read(mem.addr, &mmio); |
| if (status != ZX_OK) { |
| return status; |
| } |
| switch (inst->access_size) { |
| case 1: |
| return inst_test8(inst, static_cast<uint8_t>(inst->imm), mmio.u8); |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| |
| default: |
| return ZX_ERR_INVALID_ARGS; |
| } |
| } |
| #endif |
| |
| Vcpu::Vcpu(uint64_t id, Guest* guest, zx_gpaddr_t entry, zx_gpaddr_t boot_ptr, async::Loop* loop) |
| : id_(id), guest_(guest), entry_(entry), boot_ptr_(boot_ptr), loop_(loop) {} |
| |
| zx_status_t Vcpu::Start() { |
| std::promise<zx_status_t> barrier; |
| std::future<zx_status_t> barrier_future = barrier.get_future(); |
| std::thread(fit::bind_member(this, &Vcpu::Loop), std::move(barrier)).detach(); |
| barrier_future.wait(); |
| return barrier_future.get(); |
| } |
| |
| Vcpu* Vcpu::GetCurrent() { |
| FX_DCHECK(thread_vcpu != nullptr) << "Thread does not have a VCPU"; |
| return thread_vcpu; |
| } |
| |
| zx_status_t Vcpu::Loop(std::promise<zx_status_t> barrier) { |
| FX_DCHECK(thread_vcpu == nullptr) << "Thread has multiple VCPUs"; |
| |
| // Set the thread state. |
| { |
| thread_vcpu = this; |
| auto name = fxl::StringPrintf("vcpu-%lu", id_); |
| zx_status_t status = zx::thread::self()->set_property(ZX_PROP_NAME, name.c_str(), name.size()); |
| if (status != ZX_OK) { |
| FX_PLOGS(WARNING, status) << "Failed to set VCPU " << id_ << " thread name"; |
| } |
| } |
| |
| // Create the VCPU. |
| { |
| zx_status_t status = zx::vcpu::create(guest_->object(), 0, entry_, &vcpu_); |
| if (status != ZX_OK) { |
| FX_PLOGS(ERROR, status) << "Failed to create VCPU " << id_; |
| barrier.set_value(status); |
| return status; |
| } |
| } |
| |
| // Set the initial VCPU state. |
| { |
| zx_vcpu_state_t vcpu_state = {}; |
| #if __aarch64__ |
| vcpu_state.x[0] = boot_ptr_; |
| #elif __x86_64__ |
| vcpu_state.rsi = boot_ptr_; |
| #endif |
| |
| zx_status_t status = vcpu_.write_state(ZX_VCPU_STATE, &vcpu_state, sizeof(vcpu_state)); |
| if (status != ZX_OK) { |
| FX_PLOGS(ERROR, status) << "Failed to set VCPU " << id_ << " state"; |
| barrier.set_value(status); |
| return status; |
| } |
| } |
| |
| // Unblock VCPU startup barrier. |
| barrier.set_value(ZX_OK); |
| |
| // Quit the main loop if we return. |
| auto deferred = fit::defer([this] { loop_->Quit(); }); |
| |
| while (true) { |
| zx_port_packet_t packet; |
| zx_status_t status = vcpu_.resume(&packet); |
| switch (status) { |
| case ZX_OK: |
| break; |
| case ZX_ERR_STOP: |
| // Only stop this VCPU. |
| deferred.cancel(); |
| return ZX_OK; |
| case ZX_ERR_UNAVAILABLE: |
| case ZX_ERR_CANCELED: |
| return ZX_OK; |
| default: |
| FX_PLOGS(ERROR, status) << "Failed to resume VCPU " << id_; |
| return status; |
| } |
| |
| status = HandlePacket(packet); |
| switch (status) { |
| case ZX_OK: |
| break; |
| case ZX_ERR_STOP: |
| // Only stop this VCPU. |
| deferred.cancel(); |
| return ZX_OK; |
| default: |
| FX_PLOGS(ERROR, status) << "Failed to handle packet " << packet.type; |
| return status; |
| } |
| } |
| } |
| |
| zx_status_t Vcpu::Interrupt(uint32_t vector) { return vcpu_.interrupt(vector); } |
| |
| zx_status_t Vcpu::HandlePacket(const zx_port_packet_t& packet) { |
| switch (packet.type) { |
| case ZX_PKT_TYPE_GUEST_MEM: |
| return HandleMem(packet.guest_mem, packet.key); |
| #if __x86_64__ |
| case ZX_PKT_TYPE_GUEST_IO: |
| return HandleIo(packet.guest_io, packet.key); |
| #endif // __x86_64__ |
| case ZX_PKT_TYPE_GUEST_VCPU: |
| return HandleVcpu(packet.guest_vcpu, packet.key); |
| default: |
| FX_LOGS(ERROR) << "Unhandled guest packet " << packet.type; |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| } |
| |
| zx_status_t Vcpu::HandleMem(const zx_packet_guest_mem_t& mem, uint64_t trap_key) { |
| zx_vcpu_state_t vcpu_state; |
| zx_status_t status; |
| #if __aarch64__ |
| if (mem.read) |
| #endif |
| { |
| status = vcpu_.read_state(ZX_VCPU_STATE, &vcpu_state, sizeof(vcpu_state)); |
| if (status != ZX_OK) { |
| return status; |
| } |
| } |
| |
| bool do_write = false; |
| #if __aarch64__ |
| do_write = mem.read; |
| status = HandleMemArm(mem, trap_key, &vcpu_state.x[mem.xt]); |
| #elif __x86_64__ |
| Instruction inst; |
| status = inst_decode(mem.inst_buf, mem.inst_len, mem.default_operand_size, &vcpu_state, &inst); |
| if (status != ZX_OK) { |
| std::string inst; |
| for (uint8_t i = 0; i < mem.inst_len; i++) { |
| fxl::StringAppendf(&inst, " %x", mem.inst_buf[i]); |
| } |
| FX_LOGS(ERROR) << "Unsupported instruction:" << inst; |
| } else { |
| status = HandleMemX86(mem, trap_key, &inst); |
| // If there was an attempt to read or test memory, update the GPRs. |
| do_write = inst.type == INST_MOV_READ || inst.type == INST_TEST; |
| } |
| #endif // __x86_64__ |
| |
| if (status == ZX_OK && do_write) { |
| return vcpu_.write_state(ZX_VCPU_STATE, &vcpu_state, sizeof(vcpu_state)); |
| } |
| |
| return status; |
| } |
| |
| #if __x86_64__ |
| zx_status_t Vcpu::HandleInput(const zx_packet_guest_io_t& io, uint64_t trap_key) { |
| TRACE_DURATION("machina", "pio_in", "port", io.port, "access_size", io.access_size); |
| |
| IoValue value = {}; |
| value.access_size = io.access_size; |
| zx_status_t status = IoMapping::FromPortKey(trap_key)->Read(io.port, &value); |
| if (status != ZX_OK) { |
| FX_PLOGS(ERROR, status) << "Failed to handle port in 0x" << std::hex << io.port; |
| return status; |
| } |
| |
| zx_vcpu_io_t vcpu_io; |
| memset(&vcpu_io, 0, sizeof(vcpu_io)); |
| vcpu_io.access_size = value.access_size; |
| vcpu_io.u32 = value.u32; |
| if (vcpu_io.access_size != io.access_size) { |
| FX_LOGS(ERROR) << "Unexpected size (" << vcpu_io.access_size << " != " << io.access_size |
| << ") for port in 0x" << std::hex << io.port; |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| return vcpu_.write_state(ZX_VCPU_IO, &vcpu_io, sizeof(vcpu_io)); |
| } |
| |
| zx_status_t Vcpu::HandleOutput(const zx_packet_guest_io_t& io, uint64_t trap_key) { |
| TRACE_DURATION("machina", "pio_out", "port", io.port, "access_size", io.access_size); |
| |
| IoValue value; |
| value.access_size = io.access_size; |
| value.u32 = io.u32; |
| zx_status_t status = IoMapping::FromPortKey(trap_key)->Write(io.port, value); |
| if (status != ZX_OK) { |
| FX_PLOGS(ERROR, status) << "Failed to handle port out 0x" << std::hex << io.port; |
| } |
| return status; |
| } |
| |
| zx_status_t Vcpu::HandleIo(const zx_packet_guest_io_t& io, uint64_t trap_key) { |
| return io.input ? HandleInput(io, trap_key) : HandleOutput(io, trap_key); |
| } |
| #endif // __x86_64__ |
| |
| zx_status_t Vcpu::HandleVcpu(const zx_packet_guest_vcpu_t& packet, uint64_t trap_key) { |
| switch (packet.type) { |
| case ZX_PKT_GUEST_VCPU_INTERRUPT: |
| return guest_->Interrupt(packet.interrupt.mask, packet.interrupt.vector); |
| case ZX_PKT_GUEST_VCPU_STARTUP: |
| return guest_->StartVcpu(packet.startup.id, packet.startup.entry, boot_ptr_, loop_); |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| } |