src/cpu/kvm/x86_cpu.hh - amd/gem5 - Git at Google

 /*
  * Copyright (c) 2013 Andreas Sandberg
  * All rights reserved
  *
  * 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_X86_CPU_HH__
 #define __CPU_KVM_X86_CPU_HH__

 #include "cpu/kvm/base.hh"
 #include "cpu/kvm/vm.hh"
 #include "params/X86KvmCPU.hh"

 /**
  * x86 implementation of a KVM-based hardware virtualized CPU.
  */
 class X86KvmCPU : public BaseKvmCPU
 {
   public:
     X86KvmCPU(X86KvmCPUParams *params);
     virtual ~X86KvmCPU();

     void startup() override;

     /** @{ */
     void dump() const override;
     void dumpFpuRegs() const;
     void dumpIntRegs() const;
     void dumpSpecRegs() const;
     void dumpDebugRegs() const;
     void dumpXCRs() const;
     void dumpXSave() const;
     void dumpVCpuEvents() const;
     void dumpMSRs() const;
     /** @} */

   protected:
     typedef std::vector<struct kvm_msr_entry> KvmMSRVector;

     Tick kvmRun(Tick ticks) override;

     /**
      * Run the virtual CPU until draining completes.
      *
      * In addition to the base functionality provided by
      * BaseKvmCPU::kvmRunDrain(), this method handles x86-specific
      * cases where there are pending interrupt events in the virtual
      * CPU.  These are handled by requesting an interrupt window if
      * interrupts are pending (causing the vCPU to execute until
      * interrupts can be delivered again).
      *
      * @see BaseKvmCPU::kvmRunDrain()
      * @see archIsDrained()
      *
      * @return Number of ticks executed
      */
     Tick kvmRunDrain() override;

     /** Wrapper that synchronizes state in kvm_run */
     Tick kvmRunWrapper(Tick ticks);

     uint64_t getHostCycles() const override;

     /**
      * Methods to access CPUID information using the extended
      * API. Only available if Kvm::capExtendedCPUID() is true.
      *
      * @{
      */
     void setCPUID(const struct kvm_cpuid2 &cpuid);
     void setCPUID(const Kvm::CPUIDVector &cpuid);
     /** @} */

     /**
      * Methods to access MSRs in the guest.
      *
      * @{
      */
     void setMSRs(const struct kvm_msrs &msrs);
     void setMSRs(const KvmMSRVector &msrs);
     void getMSRs(struct kvm_msrs &msrs) const;
     void setMSR(uint32_t index, uint64_t value);
     uint64_t getMSR(uint32_t index) const;
     /** @} */

     /**
      * Get a list of MSRs supported by both gem5 and KVM.
      *
      * @note This method uses an internal cache and only generates the
      * MSR list once.
      *
      * @return reference to a list of msr indices
      */
     const Kvm::MSRIndexVector &getMsrIntersection() const;

     /**
      * Wrappers around KVM's state transfer methods.
      *
      * @{
      */
     void getDebugRegisters(struct kvm_debugregs &regs) const;
     void setDebugRegisters(const struct kvm_debugregs &regs);
     void getXCRs(struct kvm_xcrs &regs) const;
     void setXCRs(const struct kvm_xcrs &regs);
     void getXSave(struct kvm_xsave &xsave) const;
     void setXSave(const struct kvm_xsave &xsave);
     void getVCpuEvents(struct kvm_vcpu_events &events) const;
     void setVCpuEvents(const struct kvm_vcpu_events &events);
     /** @} */

     void updateKvmState() override;
     void updateThreadContext() override;

     /**
      * Inject pending interrupts from gem5 into the virtual CPU.
      */
     void deliverInterrupts();

     /**
      * Handle x86 legacy IO (in/out)
      */
     Tick handleKvmExitIO() override;

     Tick handleKvmExitIRQWindowOpen() override;

     /**
      * Check if there are pending events in the vCPU that prevents it
      * from being drained.
      *
      * There are cases after interrupt injection where the interrupt
      * is still pending in the guest. This method detects such cases
      * and requests additional draining.
      *
      * @return False if there are pending events in the guest, True
      * otherwise.
      */
     bool archIsDrained() const override;

   private:
     /**
      * Support routines to update the state of the KVM CPU from gem5's
      * state representation.
      *
      * @{
      */
     /** Update integer registers */
     void updateKvmStateRegs();
     /** Update control registers (CRx, segments, etc.) */
     void updateKvmStateSRegs();
     /**
      * Update FPU and SIMD registers
      *
      * This method uses the appropriate (depending on availability and
      * user configuration) kernel API by calling
      * updateKvmStateFPULegacy() or updateKvmStateFPUXSave().
      *
      * @see updateKvmStateFPULegacy()
      * @see updateKvmStateFPUXSave()
      */
     void updateKvmStateFPU();
     /**
      * Update FPU and SIMD registers using the legacy API
      *
      * @note This method should normally only be called by
      * updateKvmStateFPU() which automatically chooses between
      * available APIs.
      */
     void updateKvmStateFPULegacy();
     /**
      * Update FPU and SIMD registers using the XSave API
      *
      * @note This method should normally only be called by
      * updateKvmStateFPU() which automatically chooses between
      * available APIs.
      */
     void updateKvmStateFPUXSave();
     /** Update MSR registers */
     void updateKvmStateMSRs();
     /** @} */

     /**
      * Support routines to update the state of gem5's thread context from
      * KVM's state representation.
      *
      * @{
      */
     /** Update integer registers */
     void updateThreadContextRegs(const struct kvm_regs &regs,
                                  const struct kvm_sregs &sregs);
     /** Update control registers (CRx, segments, etc.) */
     void updateThreadContextSRegs(const struct kvm_sregs &sregs);
     /** Update FPU and SIMD registers using the legacy API */
     void updateThreadContextFPU(const struct kvm_fpu &fpu);
     /** Update FPU and SIMD registers using the XSave API */
     void updateThreadContextXSave(const struct kvm_xsave &kxsave);
     /** Update MSR registers */
     void updateThreadContextMSRs();
     /** @} */

     /** Transfer gem5's CPUID values into the virtual CPU. */
     void updateCPUID();

     /**
      * Handle a 32-bit IO access that should be mapped to a MiscReg.
      *
      * @note This method can only be called on when handling IO after
      * a KVM_EXIT_IO.
      *
      * @param miscreg Register to map the current IO access to.
      */
     void handleIOMiscReg32(int miscreg);

     /** Cached intersection of supported MSRs */
     mutable Kvm::MSRIndexVector cachedMsrIntersection;

     /** @{ */
     /** Kvm::capDebugRegs() available? */
     bool haveDebugRegs;
     /** Kvm::capXSave() available? */
     bool haveXSave;
     /**
      * Should the XSave interface be used to sync the FPU and SIMD
      * registers?
      */
     bool useXSave;
     /** Kvm::capXCRs() available? */
     bool haveXCRs;
     /** @} */
 };

 #endif
	/*
	* Copyright (c) 2013 Andreas Sandberg
	* All rights reserved
	*
	* 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_X86_CPU_HH__
	#define __CPU_KVM_X86_CPU_HH__

	#include "cpu/kvm/base.hh"
	#include "cpu/kvm/vm.hh"
	#include "params/X86KvmCPU.hh"

	/**
	* x86 implementation of a KVM-based hardware virtualized CPU.
	*/
	class X86KvmCPU : public BaseKvmCPU
	{
	public:
	X86KvmCPU(X86KvmCPUParams *params);
	virtual ~X86KvmCPU();

	void startup() override;

	/** @{ */
	void dump() const override;
	void dumpFpuRegs() const;
	void dumpIntRegs() const;
	void dumpSpecRegs() const;
	void dumpDebugRegs() const;
	void dumpXCRs() const;
	void dumpXSave() const;
	void dumpVCpuEvents() const;
	void dumpMSRs() const;
	/** @} */

	protected:
	typedef std::vector<struct kvm_msr_entry> KvmMSRVector;

	Tick kvmRun(Tick ticks) override;

	/**
	* Run the virtual CPU until draining completes.
	*
	* In addition to the base functionality provided by
	* BaseKvmCPU::kvmRunDrain(), this method handles x86-specific
	* cases where there are pending interrupt events in the virtual
	* CPU. These are handled by requesting an interrupt window if
	* interrupts are pending (causing the vCPU to execute until
	* interrupts can be delivered again).
	*
	* @see BaseKvmCPU::kvmRunDrain()
	* @see archIsDrained()
	*
	* @return Number of ticks executed
	*/
	Tick kvmRunDrain() override;

	/** Wrapper that synchronizes state in kvm_run */
	Tick kvmRunWrapper(Tick ticks);

	uint64_t getHostCycles() const override;

	/**
	* Methods to access CPUID information using the extended
	* API. Only available if Kvm::capExtendedCPUID() is true.
	*
	* @{
	*/
	void setCPUID(const struct kvm_cpuid2 &cpuid);
	void setCPUID(const Kvm::CPUIDVector &cpuid);
	/** @} */

	/**
	* Methods to access MSRs in the guest.
	*
	* @{
	*/
	void setMSRs(const struct kvm_msrs &msrs);
	void setMSRs(const KvmMSRVector &msrs);
	void getMSRs(struct kvm_msrs &msrs) const;
	void setMSR(uint32_t index, uint64_t value);
	uint64_t getMSR(uint32_t index) const;
	/** @} */

	/**
	* Get a list of MSRs supported by both gem5 and KVM.
	*
	* @note This method uses an internal cache and only generates the
	* MSR list once.
	*
	* @return reference to a list of msr indices
	*/
	const Kvm::MSRIndexVector &getMsrIntersection() const;

	/**
	* Wrappers around KVM's state transfer methods.
	*
	* @{
	*/
	void getDebugRegisters(struct kvm_debugregs &regs) const;
	void setDebugRegisters(const struct kvm_debugregs &regs);
	void getXCRs(struct kvm_xcrs &regs) const;
	void setXCRs(const struct kvm_xcrs &regs);
	void getXSave(struct kvm_xsave &xsave) const;
	void setXSave(const struct kvm_xsave &xsave);
	void getVCpuEvents(struct kvm_vcpu_events &events) const;
	void setVCpuEvents(const struct kvm_vcpu_events &events);
	/** @} */

	void updateKvmState() override;
	void updateThreadContext() override;

	/**
	* Inject pending interrupts from gem5 into the virtual CPU.
	*/
	void deliverInterrupts();

	/**
	* Handle x86 legacy IO (in/out)
	*/
	Tick handleKvmExitIO() override;

	Tick handleKvmExitIRQWindowOpen() override;

	/**
	* Check if there are pending events in the vCPU that prevents it
	* from being drained.
	*
	* There are cases after interrupt injection where the interrupt
	* is still pending in the guest. This method detects such cases
	* and requests additional draining.
	*
	* @return False if there are pending events in the guest, True
	* otherwise.
	*/
	bool archIsDrained() const override;

	private:
	/**
	* Support routines to update the state of the KVM CPU from gem5's
	* state representation.
	*
	* @{
	*/
	/** Update integer registers */
	void updateKvmStateRegs();
	/** Update control registers (CRx, segments, etc.) */
	void updateKvmStateSRegs();
	/**
	* Update FPU and SIMD registers
	*
	* This method uses the appropriate (depending on availability and
	* user configuration) kernel API by calling
	* updateKvmStateFPULegacy() or updateKvmStateFPUXSave().
	*
	* @see updateKvmStateFPULegacy()
	* @see updateKvmStateFPUXSave()
	*/
	void updateKvmStateFPU();
	/**
	* Update FPU and SIMD registers using the legacy API
	*
	* @note This method should normally only be called by
	* updateKvmStateFPU() which automatically chooses between
	* available APIs.
	*/
	void updateKvmStateFPULegacy();
	/**
	* Update FPU and SIMD registers using the XSave API
	*
	* @note This method should normally only be called by
	* updateKvmStateFPU() which automatically chooses between
	* available APIs.
	*/
	void updateKvmStateFPUXSave();
	/** Update MSR registers */
	void updateKvmStateMSRs();
	/** @} */

	/**
	* Support routines to update the state of gem5's thread context from
	* KVM's state representation.
	*
	* @{
	*/
	/** Update integer registers */
	void updateThreadContextRegs(const struct kvm_regs &regs,
	const struct kvm_sregs &sregs);
	/** Update control registers (CRx, segments, etc.) */
	void updateThreadContextSRegs(const struct kvm_sregs &sregs);
	/** Update FPU and SIMD registers using the legacy API */
	void updateThreadContextFPU(const struct kvm_fpu &fpu);
	/** Update FPU and SIMD registers using the XSave API */
	void updateThreadContextXSave(const struct kvm_xsave &kxsave);
	/** Update MSR registers */
	void updateThreadContextMSRs();
	/** @} */

	/** Transfer gem5's CPUID values into the virtual CPU. */
	void updateCPUID();

	/**
	* Handle a 32-bit IO access that should be mapped to a MiscReg.
	*
	* @note This method can only be called on when handling IO after
	* a KVM_EXIT_IO.
	*
	* @param miscreg Register to map the current IO access to.
	*/
	void handleIOMiscReg32(int miscreg);

	/** Cached intersection of supported MSRs */
	mutable Kvm::MSRIndexVector cachedMsrIntersection;

	/** @{ */
	/** Kvm::capDebugRegs() available? */
	bool haveDebugRegs;
	/** Kvm::capXSave() available? */
	bool haveXSave;
	/**
	* Should the XSave interface be used to sync the FPU and SIMD
	* registers?
	*/
	bool useXSave;
	/** Kvm::capXCRs() available? */
	bool haveXCRs;
	/** @} */
	};

	#endif