kvm: Add basic support for ARM
Architecture specific limitations: * LPAE is currently not supported by gem5. We therefore panic if LPAE is enabled when returning to gem5. * The co-processor based interface to the architected timer is unsupported. We can't support this due to limitations in the KVM API on ARM. * M5 ops are currently not supported. This requires either a kernel hack or a memory mapped device that handles the guest<->m5 interface.
This commit is contained in:
Andreas Sandberg
parent
6d2941d990
commit
f156020158
5 changed files with 914 additions and 0 deletions
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@ -953,6 +953,7 @@ if not have_kvm:
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# Check if the requested target ISA is compatible with the host
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def is_isa_kvm_compatible(isa):
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isa_comp_table = {
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"arm" : ( "armv7l" ),
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}
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try:
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import platform
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43
src/cpu/kvm/ArmKvmCPU.py
Normal file
43
src/cpu/kvm/ArmKvmCPU.py
Normal file
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@ -0,0 +1,43 @@
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# Copyright (c) 2012 ARM Limited
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# All rights reserved.
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Andreas Sandberg
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from m5.params import *
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from BaseKvmCPU import BaseKvmCPU
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class ArmKvmCPU(BaseKvmCPU):
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type = 'ArmKvmCPU'
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cxx_header = "cpu/kvm/arm_cpu.hh"
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@ -48,6 +48,10 @@ if env['USE_KVM']:
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Source('perfevent.cc')
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Source('timer.cc')
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if env['TARGET_ISA'] == 'arm':
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SimObject('ArmKvmCPU.py')
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Source('arm_cpu.cc')
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DebugFlag('Kvm', 'Basic KVM Functionality')
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DebugFlag('KvmContext', 'KVM/gem5 context synchronization')
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DebugFlag('KvmIO', 'KVM MMIO diagnostics')
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705
src/cpu/kvm/arm_cpu.cc
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705
src/cpu/kvm/arm_cpu.cc
Normal file
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@ -0,0 +1,705 @@
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/*
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* Copyright (c) 2012 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Andreas Sandberg
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*/
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#include <linux/kvm.h>
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#include <algorithm>
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#include <cerrno>
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#include <memory>
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#include "arch/registers.hh"
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#include "cpu/kvm/arm_cpu.hh"
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#include "cpu/kvm/base.hh"
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#include "debug/Kvm.hh"
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#include "debug/KvmContext.hh"
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#include "debug/KvmInt.hh"
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using namespace ArmISA;
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#define EXTRACT_FIELD(val, mask, shift) \
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(((val) & (mask)) >> (shift))
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#define REG_IS_ARM(id) \
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(((id) & KVM_REG_ARCH_MASK) == KVM_REG_ARM)
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#define REG_IS_32BIT(id) \
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(((id) & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32)
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#define REG_IS_64BIT(id) \
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(((id) & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64)
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#define REG_IS_CP(id, cp) \
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(((id) & KVM_REG_ARM_COPROC_MASK) == (cp))
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#define REG_IS_CORE(id) REG_IS_CP((id), KVM_REG_ARM_CORE)
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#define REG_IS_VFP(id) REG_IS_CP((id), KVM_REG_ARM_VFP)
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#define REG_VFP_REG(id) ((id) & KVM_REG_ARM_VFP_MASK)
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// HACK: These aren't really defined in any of the headers, so we'll
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// assume some reasonable values for now.
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#define REG_IS_VFP_REG(id) (REG_VFP_REG(id) < 0x100)
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#define REG_IS_VFP_CTRL(id) (REG_VFP_REG(id) >= 0x100)
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#define REG_IS_DEMUX(id) REG_IS_CP((id), KVM_REG_ARM_DEMUX)
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// There is no constant in the kernel headers defining the mask to use
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// to get the core register index. We'll just do what they do
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// internally.
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#define REG_CORE_IDX(id) \
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(~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE))
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#define REG_CP(id) \
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EXTRACT_FIELD(id, KVM_REG_ARM_COPROC_MASK, KVM_REG_ARM_COPROC_SHIFT)
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#define REG_CRN(id) \
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EXTRACT_FIELD(id, KVM_REG_ARM_32_CRN_MASK, KVM_REG_ARM_32_CRN_SHIFT)
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#define REG_OPC1(id) \
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EXTRACT_FIELD(id, KVM_REG_ARM_OPC1_MASK, KVM_REG_ARM_OPC1_SHIFT)
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#define REG_CRM(id) \
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EXTRACT_FIELD(id, KVM_REG_ARM_CRM_MASK, KVM_REG_ARM_CRM_SHIFT)
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#define REG_OPC2(id) \
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EXTRACT_FIELD(id, KVM_REG_ARM_32_OPC2_MASK, KVM_REG_ARM_32_OPC2_SHIFT)
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#define REG_CP32(cpnum, crn, opc1, crm, opc2) ( \
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(KVM_REG_ARM | KVM_REG_SIZE_U32) | \
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((cpnum) << KVM_REG_ARM_COPROC_SHIFT) | \
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((crn) << KVM_REG_ARM_32_CRN_SHIFT) | \
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((opc1) << KVM_REG_ARM_OPC1_SHIFT) | \
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((crm) << KVM_REG_ARM_CRM_SHIFT) | \
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((opc2) << KVM_REG_ARM_32_OPC2_SHIFT))
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#define REG_CP64(cpnum, opc1, crm) ( \
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(KVM_REG_ARM | KVM_REG_SIZE_U64) | \
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((cpnum) << KVM_REG_ARM_COPROC_SHIFT) | \
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((opc1) << KVM_REG_ARM_OPC1_SHIFT) | \
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((crm) << KVM_REG_ARM_CRM_SHIFT))
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#define REG_CORE32(kname) ( \
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(KVM_REG_ARM | KVM_REG_SIZE_U32) | \
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(KVM_REG_ARM_CORE) | \
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(KVM_REG_ARM_CORE_REG(kname)))
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#define REG_VFP32(regno) ( \
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(KVM_REG_ARM | KVM_REG_SIZE_U32) | \
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KVM_REG_ARM_VFP | (regno))
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#define REG_VFP64(regno) ( \
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(KVM_REG_ARM | KVM_REG_SIZE_U64) | \
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KVM_REG_ARM_VFP | (regno))
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#define REG_DEMUX32(dmxid, val) ( \
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(KVM_REG_ARM | KVM_REG_SIZE_U32) | \
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(dmxid) | (val))
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// Some of the co-processor registers are invariants and must have the
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// same value on both the host and the guest. We need to keep a list
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// of these to prevent gem5 from fiddling with them on the guest.
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static uint64_t invariant_reg_vector[] = {
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REG_CP32(15, 0, 0, 0, 0), // MIDR
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REG_CP32(15, 0, 0, 0, 1), // CTR
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REG_CP32(15, 0, 0, 0, 2), // TCMTR
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REG_CP32(15, 0, 0, 0, 3), // TLBTR
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REG_CP32(15, 0, 0, 0, 6), // REVIDR
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REG_CP32(15, 0, 0, 1, 0), // ID_PFR0
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REG_CP32(15, 0, 0, 1, 1), // ID_PFR1
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REG_CP32(15, 0, 0, 1, 2), // ID_DFR0
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REG_CP32(15, 0, 0, 1, 3), // ID_AFR0
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REG_CP32(15, 0, 0, 1, 4), // ID_MMFR0
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REG_CP32(15, 0, 0, 1, 5), // ID_MMFR1
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REG_CP32(15, 0, 0, 1, 6), // ID_MMFR2
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REG_CP32(15, 0, 0, 1, 7), // ID_MMFR3
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REG_CP32(15, 0, 0, 2, 0), // ID_ISAR0
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REG_CP32(15, 0, 0, 2, 1), // ID_ISAR1
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REG_CP32(15, 0, 0, 2, 2), // ID_ISAR2
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REG_CP32(15, 0, 0, 2, 3), // ID_ISAR3
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REG_CP32(15, 0, 0, 2, 4), // ID_ISAR4
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REG_CP32(15, 0, 0, 2, 5), // ID_ISAR5
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REG_CP32(15, 0, 1, 0, 0), // CSSIDR
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REG_CP32(15, 0, 1, 0, 1), // CLIDR
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REG_CP32(15, 0, 1, 0, 7), // AIDR
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REG_VFP32(KVM_REG_ARM_VFP_MVFR0),
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REG_VFP32(KVM_REG_ARM_VFP_MVFR1),
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REG_VFP32(KVM_REG_ARM_VFP_FPSID),
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REG_DEMUX32(KVM_REG_ARM_DEMUX_ID_CCSIDR, 0),
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};
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const static uint64_t KVM_REG64_TTBR0(REG_CP64(15, 0, 2));
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const static uint64_t KVM_REG64_TTBR1(REG_CP64(15, 1, 2));
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#define INTERRUPT_ID(type, vcpu, irq) ( \
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((type) << KVM_ARM_IRQ_TYPE_SHIFT) | \
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((vcpu) << KVM_ARM_IRQ_VCPU_SHIFT) | \
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((irq) << KVM_ARM_IRQ_NUM_SHIFT))
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#define INTERRUPT_VCPU_IRQ(vcpu) \
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INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_IRQ)
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#define INTERRUPT_VCPU_FIQ(vcpu) \
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INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_FIQ)
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#define COUNT_OF(l) (sizeof(l) / sizeof(*l))
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const std::set<uint64_t> ArmKvmCPU::invariant_regs(
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invariant_reg_vector,
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invariant_reg_vector + COUNT_OF(invariant_reg_vector));
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ArmKvmCPU::KvmIntRegInfo ArmKvmCPU::kvmIntRegs[] = {
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{ REG_CORE32(usr_regs.ARM_r0), INTREG_R0, "R0" },
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{ REG_CORE32(usr_regs.ARM_r1), INTREG_R1, "R1" },
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{ REG_CORE32(usr_regs.ARM_r2), INTREG_R2, "R2" },
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{ REG_CORE32(usr_regs.ARM_r3), INTREG_R3, "R3" },
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{ REG_CORE32(usr_regs.ARM_r4), INTREG_R4, "R4" },
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{ REG_CORE32(usr_regs.ARM_r5), INTREG_R5, "R5" },
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{ REG_CORE32(usr_regs.ARM_r6), INTREG_R6, "R6" },
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{ REG_CORE32(usr_regs.ARM_r7), INTREG_R7, "R7" },
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{ REG_CORE32(usr_regs.ARM_r8), INTREG_R8, "R8" },
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{ REG_CORE32(usr_regs.ARM_r9), INTREG_R9, "R9" },
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{ REG_CORE32(usr_regs.ARM_r10), INTREG_R10, "R10" },
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{ REG_CORE32(usr_regs.ARM_fp), INTREG_R11, "R11" },
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{ REG_CORE32(usr_regs.ARM_ip), INTREG_R12, "R12" },
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{ REG_CORE32(usr_regs.ARM_sp), INTREG_R13, "R13(USR)" },
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{ REG_CORE32(usr_regs.ARM_lr), INTREG_R14, "R14(USR)" },
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{ REG_CORE32(svc_regs[0]), INTREG_SP_SVC, "R13(SVC)" },
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{ REG_CORE32(svc_regs[1]), INTREG_LR_SVC, "R14(SVC)" },
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{ REG_CORE32(abt_regs[0]), INTREG_SP_ABT, "R13(ABT)" },
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{ REG_CORE32(abt_regs[1]), INTREG_LR_ABT, "R14(ABT)" },
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{ REG_CORE32(und_regs[0]), INTREG_SP_UND, "R13(UND)" },
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{ REG_CORE32(und_regs[1]), INTREG_LR_UND, "R14(UND)" },
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{ REG_CORE32(irq_regs[0]), INTREG_SP_IRQ, "R13(IRQ)" },
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{ REG_CORE32(irq_regs[1]), INTREG_LR_IRQ, "R14(IRQ)" },
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{ REG_CORE32(fiq_regs[0]), INTREG_R8_FIQ, "R8(FIQ)" },
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{ REG_CORE32(fiq_regs[1]), INTREG_R9_FIQ, "R9(FIQ)" },
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{ REG_CORE32(fiq_regs[2]), INTREG_R10_FIQ, "R10(FIQ)" },
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{ REG_CORE32(fiq_regs[3]), INTREG_R11_FIQ, "R11(FIQ)" },
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{ REG_CORE32(fiq_regs[4]), INTREG_R12_FIQ, "R12(FIQ)" },
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{ REG_CORE32(fiq_regs[5]), INTREG_R13_FIQ, "R13(FIQ)" },
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{ REG_CORE32(fiq_regs[6]), INTREG_R14_FIQ, "R14(FIQ)" },
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{ 0, NUM_INTREGS, NULL }
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};
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ArmKvmCPU::KvmCoreMiscRegInfo ArmKvmCPU::kvmCoreMiscRegs[] = {
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{ REG_CORE32(usr_regs.ARM_cpsr), MISCREG_CPSR, "CPSR" },
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{ REG_CORE32(svc_regs[2]), MISCREG_SPSR_SVC, "SPSR(SVC)" },
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{ REG_CORE32(abt_regs[2]), MISCREG_SPSR_ABT, "SPSR(ABT)" },
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{ REG_CORE32(und_regs[2]), MISCREG_SPSR_UND, "SPSR(UND)" },
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{ REG_CORE32(irq_regs[2]), MISCREG_SPSR_IRQ, "SPSR(IRQ)" },
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{ REG_CORE32(fiq_regs[2]), MISCREG_SPSR_FIQ, "SPSR(FIQ)" },
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{ 0, NUM_MISCREGS }
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};
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ArmKvmCPU::ArmKvmCPU(ArmKvmCPUParams *params)
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: BaseKvmCPU(params),
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irqAsserted(false), fiqAsserted(false)
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{
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}
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ArmKvmCPU::~ArmKvmCPU()
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{
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}
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void
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ArmKvmCPU::startup()
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{
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BaseKvmCPU::startup();
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/* TODO: This needs to be moved when we start to support VMs with
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* multiple threads since kvmArmVCpuInit requires that all CPUs in
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* the VM have been created.
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*/
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/* TODO: The CPU type needs to be configurable once KVM on ARM
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* starts to support more CPUs.
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*/
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kvmArmVCpuInit(KVM_ARM_TARGET_CORTEX_A15);
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}
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void
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ArmKvmCPU::tick()
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{
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bool simFIQ(interrupts->checkRaw(INT_FIQ));
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bool simIRQ(interrupts->checkRaw(INT_IRQ));
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if (fiqAsserted != simFIQ) {
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fiqAsserted = simFIQ;
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DPRINTF(KvmInt, "KVM: Update FIQ state: %i\n", simFIQ);
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vm.setIRQLine(INTERRUPT_VCPU_FIQ(vcpuID), simFIQ);
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}
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if (irqAsserted != simIRQ) {
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irqAsserted = simIRQ;
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DPRINTF(KvmInt, "KVM: Update IRQ state: %i\n", simIRQ);
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vm.setIRQLine(INTERRUPT_VCPU_IRQ(vcpuID), simIRQ);
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}
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BaseKvmCPU::tick();
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}
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void
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ArmKvmCPU::updateKvmState()
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{
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DPRINTF(KvmContext, "Updating KVM state...\n");
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updateKvmStateCore();
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updateKvmStateMisc();
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}
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void
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ArmKvmCPU::updateThreadContext()
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{
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DPRINTF(KvmContext, "Updating gem5 state...\n");
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updateTCStateCore();
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updateTCStateMisc();
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}
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const ArmKvmCPU::RegIndexVector &
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ArmKvmCPU::getRegList() const
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{
|
||||
if (_regIndexList.size() == 0) {
|
||||
std::unique_ptr<struct kvm_reg_list> regs;
|
||||
uint64_t i(1);
|
||||
|
||||
do {
|
||||
i <<= 1;
|
||||
regs.reset((struct kvm_reg_list *)
|
||||
operator new(sizeof(struct kvm_reg_list) +
|
||||
i * sizeof(uint64_t)));
|
||||
regs->n = i;
|
||||
} while (!getRegList(*regs));
|
||||
_regIndexList.assign(regs->reg,
|
||||
regs->reg + regs->n);
|
||||
}
|
||||
|
||||
return _regIndexList;
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::kvmArmVCpuInit(uint32_t target)
|
||||
{
|
||||
struct kvm_vcpu_init init;
|
||||
|
||||
memset(&init, 0, sizeof(init));
|
||||
|
||||
init.target = target;
|
||||
|
||||
kvmArmVCpuInit(init);
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::kvmArmVCpuInit(const struct kvm_vcpu_init &init)
|
||||
{
|
||||
if (ioctl(KVM_ARM_VCPU_INIT, (void *)&init) == -1)
|
||||
panic("KVM: Failed to initialize vCPU\n");
|
||||
}
|
||||
|
||||
MiscRegIndex
|
||||
ArmKvmCPU::decodeCoProcReg(uint64_t id) const
|
||||
{
|
||||
const unsigned cp(REG_CP(id));
|
||||
const bool is_reg32(REG_IS_32BIT(id));
|
||||
const bool is_reg64(REG_IS_64BIT(id));
|
||||
|
||||
// CP numbers larger than 15 are reserved for KVM extensions
|
||||
if (cp > 15)
|
||||
return NUM_MISCREGS;
|
||||
|
||||
const unsigned crm(REG_CRM(id));
|
||||
const unsigned crn(REG_CRN(id));
|
||||
const unsigned opc1(REG_OPC1(id));
|
||||
const unsigned opc2(REG_OPC2(id));
|
||||
|
||||
if (is_reg32) {
|
||||
switch (cp) {
|
||||
case 14:
|
||||
return decodeCP14Reg(crn, opc1, crm, opc2);
|
||||
|
||||
case 15:
|
||||
return decodeCP15Reg(crn, opc1, crm, opc2);
|
||||
|
||||
default:
|
||||
return NUM_MISCREGS;
|
||||
}
|
||||
} else if(is_reg64) {
|
||||
return NUM_MISCREGS;
|
||||
} else {
|
||||
warn("Unhandled register length, register (0x%x) ignored.\n");
|
||||
return NUM_MISCREGS;
|
||||
}
|
||||
}
|
||||
|
||||
ArmISA::MiscRegIndex
|
||||
ArmKvmCPU::decodeVFPCtrlReg(uint64_t id) const
|
||||
{
|
||||
if (!REG_IS_ARM(id) || !REG_IS_VFP(id) || !REG_IS_VFP_CTRL(id))
|
||||
return NUM_MISCREGS;
|
||||
|
||||
const unsigned vfp_reg(REG_VFP_REG(id));
|
||||
switch (vfp_reg) {
|
||||
case KVM_REG_ARM_VFP_FPSID: return MISCREG_FPSID;
|
||||
case KVM_REG_ARM_VFP_FPSCR: return MISCREG_FPSCR;
|
||||
case KVM_REG_ARM_VFP_MVFR0: return MISCREG_MVFR0;
|
||||
case KVM_REG_ARM_VFP_MVFR1: return MISCREG_MVFR1;
|
||||
case KVM_REG_ARM_VFP_FPEXC: return MISCREG_FPEXC;
|
||||
|
||||
case KVM_REG_ARM_VFP_FPINST:
|
||||
case KVM_REG_ARM_VFP_FPINST2:
|
||||
warn_once("KVM: FPINST not implemented.\n");
|
||||
return NUM_MISCREGS;
|
||||
|
||||
default:
|
||||
return NUM_MISCREGS;
|
||||
}
|
||||
}
|
||||
|
||||
bool
|
||||
ArmKvmCPU::isInvariantReg(uint64_t id)
|
||||
{
|
||||
/* Mask away the value field from multiplexed registers, we assume
|
||||
* that entire groups of multiplexed registers can be treated as
|
||||
* invariant. */
|
||||
if (REG_IS_ARM(id) && REG_IS_DEMUX(id))
|
||||
id &= ~KVM_REG_ARM_DEMUX_VAL_MASK;
|
||||
|
||||
return invariant_regs.find(id) != invariant_regs.end();
|
||||
}
|
||||
|
||||
bool
|
||||
ArmKvmCPU::getRegList(struct kvm_reg_list ®s) const
|
||||
{
|
||||
if (ioctl(KVM_GET_REG_LIST, (void *)®s) == -1) {
|
||||
if (errno == E2BIG) {
|
||||
return false;
|
||||
} else {
|
||||
panic("KVM: Failed to get vCPU register list (errno: %i)\n",
|
||||
errno);
|
||||
}
|
||||
} else {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateKvmStateCore()
|
||||
{
|
||||
for (const KvmIntRegInfo *ri(kvmIntRegs);
|
||||
ri->idx != NUM_INTREGS; ++ri) {
|
||||
|
||||
uint64_t value(tc->readIntRegFlat(ri->idx));
|
||||
DPRINTF(KvmContext, "kvm(%s) := 0x%x\n", ri->name, value);
|
||||
setOneReg(ri->id, value);
|
||||
}
|
||||
|
||||
DPRINTF(KvmContext, "kvm(PC) := 0x%x\n", tc->instAddr());
|
||||
setOneReg(REG_CORE32(usr_regs.ARM_pc), tc->instAddr());
|
||||
|
||||
for (const KvmCoreMiscRegInfo *ri(kvmCoreMiscRegs);
|
||||
ri->idx != NUM_MISCREGS; ++ri) {
|
||||
|
||||
uint64_t value(tc->readMiscReg(ri->idx));
|
||||
DPRINTF(KvmContext, "kvm(%s) := 0x%x\n", ri->name, value);
|
||||
setOneReg(ri->id, value);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateKvmStateMisc()
|
||||
{
|
||||
static bool warned(false); // We can't use warn_once since we want
|
||||
// to show /all/ registers
|
||||
|
||||
const RegIndexVector ®s(getRegList());
|
||||
|
||||
for (RegIndexVector::const_iterator it(regs.begin());
|
||||
it != regs.end();
|
||||
++it) {
|
||||
|
||||
if (!REG_IS_ARM(*it)) {
|
||||
if (!warned)
|
||||
warn("Skipping non-ARM register: 0x%x\n", *it);
|
||||
} else if (isInvariantReg(*it)) {
|
||||
DPRINTF(Kvm, "Skipping invariant register: 0x%x\n", *it);
|
||||
} else if (REG_IS_CORE(*it)) {
|
||||
// Core registers are handled in updateKvmStateCore
|
||||
continue;
|
||||
} else if (REG_CP(*it) <= 15) {
|
||||
updateKvmStateCoProc(*it, !warned);
|
||||
} else if (REG_IS_VFP(*it)) {
|
||||
updateKvmStateVFP(*it, !warned);
|
||||
} else {
|
||||
if (!warned) {
|
||||
warn("Skipping register with unknown CP (%i) id: 0x%x\n",
|
||||
REG_CP(*it), *it);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
warned = true;
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateKvmStateCoProc(uint64_t id, bool show_warnings)
|
||||
{
|
||||
MiscRegIndex reg(decodeCoProcReg(id));
|
||||
|
||||
assert(REG_IS_ARM(id));
|
||||
assert(REG_CP(id) <= 15);
|
||||
|
||||
if (id == KVM_REG64_TTBR0 || id == KVM_REG64_TTBR1) {
|
||||
// HACK HACK HACK: Workaround for 64-bit TTBRx
|
||||
reg = (id == KVM_REG64_TTBR0 ? MISCREG_TTBR0 : MISCREG_TTBR1);
|
||||
if (show_warnings)
|
||||
hack("KVM: 64-bit TTBBRx workaround\n");
|
||||
}
|
||||
|
||||
if (reg == NUM_MISCREGS) {
|
||||
if (show_warnings) {
|
||||
warn("KVM: Ignoring unknown KVM co-processor register (0x%.8x):\n",
|
||||
id);
|
||||
warn("\t0x%x: [CP: %i 64: %i CRn: c%i opc1: %.2i CRm: c%i"
|
||||
" opc2: %i]\n",
|
||||
id, REG_CP(id), REG_IS_64BIT(id), REG_CRN(id),
|
||||
REG_OPC1(id), REG_CRM(id), REG_OPC2(id));
|
||||
}
|
||||
} else if (reg >= MISCREG_CP15_UNIMP_START && reg < MISCREG_CP15_END) {
|
||||
if (show_warnings)
|
||||
warn("KVM: Co-processor reg. %s not implemented by gem5.\n",
|
||||
miscRegName[reg]);
|
||||
} else {
|
||||
setOneReg(id, tc->readMiscRegNoEffect(reg));
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateKvmStateVFP(uint64_t id, bool show_warnings)
|
||||
{
|
||||
assert(REG_IS_ARM(id));
|
||||
assert(REG_IS_VFP(id));
|
||||
|
||||
if (REG_IS_VFP_REG(id)) {
|
||||
if (!REG_IS_64BIT(id)) {
|
||||
if (show_warnings)
|
||||
warn("Unexpected VFP register length (reg: 0x%x).\n", id);
|
||||
return;
|
||||
}
|
||||
const unsigned idx(id & KVM_REG_ARM_VFP_MASK);
|
||||
const unsigned idx_base(idx << 1);
|
||||
const unsigned idx_hi(idx_base + 1);
|
||||
const unsigned idx_lo(idx_base + 0);
|
||||
uint64_t value(
|
||||
((uint64_t)tc->readFloatRegBitsFlat(idx_hi) << 32) |
|
||||
tc->readFloatRegBitsFlat(idx_lo));
|
||||
|
||||
setOneReg(id, value);
|
||||
} else if (REG_IS_VFP_CTRL(id)) {
|
||||
MiscRegIndex idx(decodeVFPCtrlReg(id));
|
||||
if (idx == NUM_MISCREGS) {
|
||||
if (show_warnings)
|
||||
warn("Unhandled VFP control register: 0x%x\n", id);
|
||||
return;
|
||||
}
|
||||
if (!REG_IS_32BIT(id)) {
|
||||
if (show_warnings)
|
||||
warn("Ignoring VFP control register (%s) with "
|
||||
"unexpected size.\n",
|
||||
miscRegName[idx]);
|
||||
return;
|
||||
}
|
||||
setOneReg(id, (uint32_t)tc->readMiscReg(idx));
|
||||
} else {
|
||||
if (show_warnings)
|
||||
warn("Unhandled VFP register: 0x%x\n", id);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateTCStateCore()
|
||||
{
|
||||
for (const KvmIntRegInfo *ri(kvmIntRegs);
|
||||
ri->idx != NUM_INTREGS; ++ri) {
|
||||
|
||||
tc->setIntRegFlat(ri->idx, getOneRegU32(ri->id));
|
||||
}
|
||||
|
||||
for (const KvmCoreMiscRegInfo *ri(kvmCoreMiscRegs);
|
||||
ri->idx != NUM_MISCREGS; ++ri) {
|
||||
|
||||
tc->setMiscRegNoEffect(ri->idx, getOneRegU32(ri->id));
|
||||
}
|
||||
|
||||
/* We want the simulator to execute all side-effects of the CPSR
|
||||
* update since this updates PC state and register maps.
|
||||
*/
|
||||
tc->setMiscReg(MISCREG_CPSR, tc->readMiscRegNoEffect(MISCREG_CPSR));
|
||||
|
||||
// We update the PC state after we have updated the CPSR the
|
||||
// contents of the CPSR affects how the npc is updated.
|
||||
PCState pc(tc->pcState());
|
||||
pc.set(getOneRegU32(REG_CORE32(usr_regs.ARM_pc)));
|
||||
tc->pcState(pc);
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateTCStateMisc()
|
||||
{
|
||||
static bool warned(false); // We can't use warn_once since we want
|
||||
// to show /all/ registers
|
||||
|
||||
const RegIndexVector ®_ids(getRegList());;
|
||||
for (RegIndexVector::const_iterator it(reg_ids.begin());
|
||||
it != reg_ids.end(); ++it) {
|
||||
|
||||
if (!REG_IS_ARM(*it)) {
|
||||
if (!warned)
|
||||
warn("Skipping non-ARM register: 0x%x\n", *it);
|
||||
} else if (REG_IS_CORE(*it)) {
|
||||
// Core registers are handled in updateKvmStateCore
|
||||
} else if (REG_CP(*it) <= 15) {
|
||||
updateTCStateCoProc(*it, !warned);
|
||||
} else if (REG_IS_VFP(*it)) {
|
||||
updateTCStateVFP(*it, !warned);
|
||||
} else {
|
||||
if (!warned) {
|
||||
warn("Skipping register with unknown CP (%i) id: 0x%x\n",
|
||||
REG_CP(*it), *it);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
warned = true;
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateTCStateCoProc(uint64_t id, bool show_warnings)
|
||||
{
|
||||
MiscRegIndex reg(decodeCoProcReg(id));
|
||||
|
||||
assert(REG_IS_ARM(id));
|
||||
assert(REG_CP(id) <= 15);
|
||||
|
||||
if (id == KVM_REG64_TTBR0 || id == KVM_REG64_TTBR1) {
|
||||
// HACK HACK HACK: We don't currently support 64-bit TTBR0/TTBR1
|
||||
hack_once("KVM: 64-bit TTBRx workaround\n");
|
||||
tc->setMiscRegNoEffect(
|
||||
id == KVM_REG64_TTBR0 ? MISCREG_TTBR0 : MISCREG_TTBR1,
|
||||
(uint32_t)(getOneRegU64(id) & 0xFFFFFFFF));
|
||||
} else if (reg == MISCREG_TTBCR) {
|
||||
uint32_t value(getOneRegU64(id));
|
||||
if (value & 0x80000000)
|
||||
panic("KVM: Guest tried to enable LPAE.\n");
|
||||
tc->setMiscRegNoEffect(reg, value);
|
||||
} else if (reg == NUM_MISCREGS) {
|
||||
if (show_warnings) {
|
||||
warn("KVM: Ignoring unknown KVM co-processor register:\n", id);
|
||||
warn("\t0x%x: [CP: %i 64: %i CRn: c%i opc1: %.2i CRm: c%i"
|
||||
" opc2: %i]\n",
|
||||
id, REG_CP(id), REG_IS_64BIT(id), REG_CRN(id),
|
||||
REG_OPC1(id), REG_CRM(id), REG_OPC2(id));
|
||||
}
|
||||
} else if (reg >= MISCREG_CP15_UNIMP_START && reg < MISCREG_CP15_END) {
|
||||
if (show_warnings)
|
||||
warn_once("KVM: Co-processor reg. %s not implemented by gem5.\n",
|
||||
miscRegName[reg]);
|
||||
} else {
|
||||
tc->setMiscRegNoEffect(reg, getOneRegU32(id));
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
ArmKvmCPU::updateTCStateVFP(uint64_t id, bool show_warnings)
|
||||
{
|
||||
assert(REG_IS_ARM(id));
|
||||
assert(REG_IS_VFP(id));
|
||||
|
||||
if (REG_IS_VFP_REG(id)) {
|
||||
if (!REG_IS_64BIT(id)) {
|
||||
if (show_warnings)
|
||||
warn("Unexpected VFP register length (reg: 0x%x).\n", id);
|
||||
return;
|
||||
}
|
||||
const unsigned idx(id & KVM_REG_ARM_VFP_MASK);
|
||||
const unsigned idx_base(idx << 1);
|
||||
const unsigned idx_hi(idx_base + 1);
|
||||
const unsigned idx_lo(idx_base + 0);
|
||||
uint64_t value(getOneRegU64(id));
|
||||
|
||||
tc->setFloatRegBitsFlat(idx_hi, (value >> 32) & 0xFFFFFFFF);
|
||||
tc->setFloatRegBitsFlat(idx_lo, value & 0xFFFFFFFF);
|
||||
} else if (REG_IS_VFP_CTRL(id)) {
|
||||
MiscRegIndex idx(decodeVFPCtrlReg(id));
|
||||
if (idx == NUM_MISCREGS) {
|
||||
if (show_warnings)
|
||||
warn("Unhandled VFP control register: 0x%x\n", id);
|
||||
return;
|
||||
}
|
||||
if (!REG_IS_32BIT(id)) {
|
||||
if (show_warnings)
|
||||
warn("Ignoring VFP control register (%s) with "
|
||||
"unexpected size.\n",
|
||||
miscRegName[idx]);
|
||||
return;
|
||||
}
|
||||
tc->setMiscReg(idx, getOneRegU64(id));
|
||||
} else {
|
||||
if (show_warnings)
|
||||
warn("Unhandled VFP register: 0x%x\n", id);
|
||||
}
|
||||
}
|
||||
|
||||
ArmKvmCPU *
|
||||
ArmKvmCPUParams::create()
|
||||
{
|
||||
return new ArmKvmCPU(this);
|
||||
}
|
||||
161
src/cpu/kvm/arm_cpu.hh
Normal file
161
src/cpu/kvm/arm_cpu.hh
Normal file
|
|
@ -0,0 +1,161 @@
|
|||
/*
|
||||
* Copyright (c) 2012 ARM Limited
|
||||
* All rights reserved
|
||||
*
|
||||
* The license below extends only to copyright in the software and shall
|
||||
* not be construed as granting a license to any other intellectual
|
||||
* property including but not limited to intellectual property relating
|
||||
* to a hardware implementation of the functionality of the software
|
||||
* licensed hereunder. You may use the software subject to the license
|
||||
* terms below provided that you ensure that this notice is replicated
|
||||
* unmodified and in its entirety in all distributions of the software,
|
||||
* modified or unmodified, in source code or in binary form.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are
|
||||
* met: redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer;
|
||||
* redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution;
|
||||
* neither the name of the copyright holders nor the names of its
|
||||
* contributors may be used to endorse or promote products derived from
|
||||
* this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
* Authors: Andreas Sandberg
|
||||
*/
|
||||
|
||||
#ifndef __CPU_KVM_ARM_CPU_HH__
|
||||
#define __CPU_KVM_ARM_CPU_HH__
|
||||
|
||||
#include <set>
|
||||
#include <vector>
|
||||
|
||||
#include "cpu/kvm/base.hh"
|
||||
#include "params/ArmKvmCPU.hh"
|
||||
|
||||
/**
|
||||
* ARM implementation of a KVM-based hardware virtualized CPU.
|
||||
* Architecture specific limitations:
|
||||
* * LPAE is currently not supported by gem5. We therefore panic if LPAE
|
||||
* is enabled when returning to gem5.
|
||||
* * The co-processor based interface to the architected timer is
|
||||
* unsupported. We can't support this due to limitations in the KVM
|
||||
* API on ARM.
|
||||
* * M5 ops are currently not supported. This requires either a kernel
|
||||
* hack or a memory mapped device that handles the guest<->m5
|
||||
* interface.
|
||||
*/
|
||||
class ArmKvmCPU : public BaseKvmCPU
|
||||
{
|
||||
public:
|
||||
ArmKvmCPU(ArmKvmCPUParams *params);
|
||||
virtual ~ArmKvmCPU();
|
||||
|
||||
void startup();
|
||||
|
||||
protected:
|
||||
struct KvmIntRegInfo {
|
||||
/** KVM ID */
|
||||
const uint64_t id;
|
||||
/** gem5 index */
|
||||
const IntRegIndex idx;
|
||||
/** Name in debug output */
|
||||
const char *name;
|
||||
};
|
||||
|
||||
struct KvmCoreMiscRegInfo {
|
||||
/** KVM ID */
|
||||
const uint64_t id;
|
||||
/** gem5 index */
|
||||
const MiscRegIndex idx;
|
||||
/** Name in debug output */
|
||||
const char *name;
|
||||
};
|
||||
|
||||
typedef std::vector<uint64_t> RegIndexVector;
|
||||
|
||||
void tick();
|
||||
|
||||
void updateKvmState();
|
||||
void updateThreadContext();
|
||||
|
||||
/**
|
||||
* Get a list of registers supported by getOneReg() and setOneReg().
|
||||
*/
|
||||
const RegIndexVector &getRegList() const;
|
||||
|
||||
void kvmArmVCpuInit(uint32_t target);
|
||||
void kvmArmVCpuInit(const struct kvm_vcpu_init &init);
|
||||
|
||||
ArmISA::MiscRegIndex decodeCoProcReg(uint64_t id) const;
|
||||
|
||||
ArmISA::MiscRegIndex decodeVFPCtrlReg(uint64_t id) const;
|
||||
|
||||
/**
|
||||
* Determine if a register is invariant.
|
||||
*
|
||||
* Some registers must have the same value in both the host and
|
||||
* the guest. Such registers are referred to as "invariant"
|
||||
* registers in KVM. This is a restriction imposed by KVM as
|
||||
* having different values in ID registers (e.g., the cache
|
||||
* identification registers) would confuse the guest kernel.
|
||||
*/
|
||||
bool isInvariantReg(uint64_t id);
|
||||
|
||||
static KvmIntRegInfo kvmIntRegs[];
|
||||
static KvmCoreMiscRegInfo kvmCoreMiscRegs[];
|
||||
|
||||
private:
|
||||
/**
|
||||
* Get a list of registers supported by getOneReg() and setOneReg().
|
||||
*
|
||||
* @return False if the number of elements allocated in the list
|
||||
* is too small to hold the complete register list (the required
|
||||
* value is written into n in this case). True on success.
|
||||
*/
|
||||
bool getRegList(struct kvm_reg_list ®s) const;
|
||||
|
||||
void updateKvmStateCore();
|
||||
void updateKvmStateMisc();
|
||||
void updateKvmStateCoProc(uint64_t id, bool show_warnings);
|
||||
void updateKvmStateVFP(uint64_t id, bool show_warnings);
|
||||
|
||||
void updateTCStateCore();
|
||||
void updateTCStateMisc();
|
||||
void updateTCStateCoProc(uint64_t id, bool show_warnings);
|
||||
void updateTCStateVFP(uint64_t id, bool show_warnings);
|
||||
|
||||
|
||||
/** Cached state of the IRQ line */
|
||||
bool irqAsserted;
|
||||
/** Cached state of the FIQ line */
|
||||
bool fiqAsserted;
|
||||
|
||||
/**
|
||||
* Cached copy of the list of co-processor registers supported by
|
||||
* KVM
|
||||
*/
|
||||
mutable RegIndexVector _regIndexList;
|
||||
|
||||
/**
|
||||
* List of co-processor registers that KVM requires to be
|
||||
* identical on both the host and the guest. KVM does not allow
|
||||
* writes to these registers.
|
||||
*/
|
||||
static const std::set<uint64_t> invariant_regs;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue