245 lines
7.8 KiB
C++
245 lines
7.8 KiB
C++
/*
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* \brief Genode/Nova specific VirtualBox SUPLib supplements
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* \author Alexander Boettcher
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* \author Norman Feske
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* \author Christian Helmuth
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*/
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/*
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* Copyright (C) 2013-2014 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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#ifndef _VIRTUALBOX__SPEC__NOVA__VCPU_VMX_H_
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#define _VIRTUALBOX__SPEC__NOVA__VCPU_VMX_H_
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/* libc includes */
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#include <stdlib.h>
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/* VirtualBox includes */
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#include <VBox/vmm/hm_vmx.h>
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#include "vmm_memory.h"
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/* Genode's VirtualBox includes */
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#include "vcpu.h"
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#include "vmx.h"
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class Vcpu_handler_vmx : public Vcpu_handler
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{
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private:
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template <unsigned X>
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__attribute__((noreturn)) void _vmx_ept()
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{
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using namespace Nova;
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using namespace Genode;
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Thread_base *myself = Thread_base::myself();
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Utcb *utcb = reinterpret_cast<Utcb *>(myself->utcb());
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_exc_memory<X>(myself, utcb, utcb->qual[0] & 0x38,
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utcb->qual[1] & ~((1UL << 12) - 1));
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}
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__attribute__((noreturn)) void _vmx_default() { _default_handler(); }
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__attribute__((noreturn)) void _vmx_startup()
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{
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using namespace Nova;
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Genode::Thread_base *myself = Genode::Thread_base::myself();
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Utcb *utcb = reinterpret_cast<Utcb *>(myself->utcb());
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/* configure VM exits to get */
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next_utcb.mtd = Nova::Mtd::CTRL;
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/* from src/VBox/VMM/VMMR0/HWVMXR0.cpp of virtualbox sources */
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next_utcb.ctrl[0] = VMX_VMCS_CTRL_PROC_EXEC_HLT_EXIT |
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VMX_VMCS_CTRL_PROC_EXEC_MOV_DR_EXIT |
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VMX_VMCS_CTRL_PROC_EXEC_UNCOND_IO_EXIT |
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/* XXX commented out because TinyCore Linux won't run as guest otherwise
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VMX_VMCS_CTRL_PROC_EXEC_MONITOR_EXIT |
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VMX_VMCS_CTRL_PROC_EXEC_MWAIT_EXIT |
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*/
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/* VMX_VMCS_CTRL_PROC_EXEC_CR8_LOAD_EXIT |
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VMX_VMCS_CTRL_PROC_EXEC_CR8_STORE_EXIT |*/
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VMX_VMCS_CTRL_PROC_EXEC_USE_TPR_SHADOW |
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VMX_VMCS_CTRL_PROC_EXEC_RDPMC_EXIT;
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/* VMX_VMCS_CTRL_PROC_EXEC_PAUSE_EXIT | */
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/*
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* Disable trapping RDTSC for now as it creates a huge load with
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* VM guests that execute it frequently.
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*/
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// VMX_VMCS_CTRL_PROC_EXEC_RDTSC_EXIT;
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next_utcb.ctrl[1] = VMX_VMCS_CTRL_PROC_EXEC2_VIRT_APIC |
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VMX_VMCS_CTRL_PROC_EXEC2_WBINVD_EXIT |
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VMX_VMCS_CTRL_PROC_EXEC2_UNRESTRICTED_GUEST |
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VMX_VMCS_CTRL_PROC_EXEC2_VPID |
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/* VMX_VMCS_CTRL_PROC_EXEC2_X2APIC | */
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VMX_VMCS_CTRL_PROC_EXEC2_RDTSCP |
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VMX_VMCS_CTRL_PROC_EXEC2_EPT;
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void *exit_status = _start_routine(_arg);
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pthread_exit(exit_status);
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Nova::reply(nullptr);
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}
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__attribute__((noreturn)) void _vmx_triple()
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{
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Vmm::printf("triple fault - dead\n");
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exit(-1);
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}
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__attribute__((noreturn)) void _vmx_irqwin() { _irq_window(); }
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__attribute__((noreturn)) void _vmx_recall()
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{
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Vcpu_handler::_recall_handler();
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}
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__attribute__((noreturn)) void _vmx_invalid()
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{
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Genode::Thread_base *myself = Genode::Thread_base::myself();
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Nova::Utcb *utcb = reinterpret_cast<Nova::Utcb *>(myself->utcb());
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unsigned const dubious = utcb->inj_info |
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utcb->intr_state | utcb->actv_state;
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if (dubious)
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Vmm::printf("%s - dubious - inj_info=0x%x inj_error=%x"
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" intr_state=0x%x actv_state=0x%x\n", __func__,
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utcb->inj_info, utcb->inj_error,
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utcb->intr_state, utcb->actv_state);
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Vmm::printf("invalid guest state - dead\n");
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exit(-1);
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}
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/*
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* This VM exit is in part handled by the NOVA kernel (writing the CR
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* register) and in part by VirtualBox (updating the PDPTE registers,
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* which requires access to the guest physical memory).
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* Intel manual sections 4.4.1 of Vol. 3A and 26.3.2.4 of Vol. 3C
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* indicate the conditions when the PDPTE registers need to get
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* updated.
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*/
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__attribute__((noreturn)) void _vmx_mov_crx()
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{
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unsigned long value;
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void *stack_reply = reinterpret_cast<void *>(&value - 1);
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Genode::Thread_base *myself = Genode::Thread_base::myself();
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Nova::Utcb *utcb = reinterpret_cast<Nova::Utcb *>(myself->utcb());
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unsigned int cr = utcb->qual[0] & 0xf;
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if (cr == 8)
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_default_handler();
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Genode::uint64_t *pdpte = (Genode::uint64_t*)
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guest_memory()->lookup(utcb->cr3, sizeof(utcb->pdpte));
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Assert(pdpte != 0);
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utcb->pdpte[0] = pdpte[0];
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utcb->pdpte[1] = pdpte[1];
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utcb->pdpte[2] = pdpte[2];
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utcb->pdpte[3] = pdpte[3];
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utcb->mtd = Nova::Mtd::PDPTE | Nova::Mtd::FPU;
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Nova::reply(stack_reply);
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}
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public:
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Vcpu_handler_vmx(size_t stack_size, const pthread_attr_t *attr,
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void *(*start_routine) (void *), void *arg,
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Genode::Cpu_session * cpu_session,
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Genode::Affinity::Location location,
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unsigned int cpu_id)
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:
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Vcpu_handler(stack_size, attr, start_routine, arg, cpu_session,
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location, cpu_id)
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{
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using namespace Nova;
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typedef Vcpu_handler_vmx This;
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Genode::addr_t const exc_base = vcpu().exc_base();
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register_handler<VMX_EXIT_TRIPLE_FAULT, This,
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&This::_vmx_triple> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_INIT_SIGNAL, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_INT_WINDOW, This,
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&This::_vmx_irqwin> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_TASK_SWITCH, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_CPUID, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_HLT, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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/* we don't support tsc offsetting for now - so let the rdtsc exit */
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register_handler<VMX_EXIT_RDTSC, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_VMCALL, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_IO_INSTR, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_RDMSR, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_WRMSR, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_ERR_INVALID_GUEST_STATE, This,
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&This::_vmx_invalid> (exc_base, Mtd::ALL | Mtd::FPU);
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// register_handler<VMX_EXIT_PAUSE, This,
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// &This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_WBINVD, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_MOV_CRX, This,
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&This::_vmx_mov_crx> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_MOV_DRX, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_TPR_BELOW_THRESHOLD, This,
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&This::_vmx_default> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VMX_EXIT_EPT_VIOLATION, This,
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&This::_vmx_ept<VMX_EXIT_EPT_VIOLATION>> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<VCPU_STARTUP, This,
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&This::_vmx_startup> (exc_base, Mtd::ALL | Mtd::FPU);
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register_handler<RECALL, This,
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&This::_vmx_recall> (exc_base, Mtd::ALL | Mtd::FPU);
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start();
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}
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bool hw_save_state(Nova::Utcb * utcb, VM * pVM, PVMCPU pVCpu) {
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return vmx_save_state(utcb, pVM, pVCpu);
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}
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bool hw_load_state(Nova::Utcb * utcb, VM * pVM, PVMCPU pVCpu) {
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return vmx_load_state(utcb, pVM, pVCpu);
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}
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bool vm_exit_requires_instruction_emulation()
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{
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if (exit_reason == VMX_EXIT_TPR_BELOW_THRESHOLD) {
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/* the instruction causing the exit has already been executed */
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return false;
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}
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if (exit_reason == RECALL)
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return false;
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return true;
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}
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};
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#endif /* _VIRTUALBOX__SPEC__NOVA__VCPU_VMX_H_ */
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