genode/repos/ports/include/vmm/vcpu_thread.h
2017-02-28 12:59:29 +01:00

166 lines
4.4 KiB
C++

/*
* \brief Utilities for implementing VMMs on Genode/NOVA
* \author Norman Feske
* \date 2013-08-20
*/
/*
* Copyright (C) 2013-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _INCLUDE__VMM__VCPU_THREAD_H_
#define _INCLUDE__VMM__VCPU_THREAD_H_
/* Genode includes */
#include <base/thread.h>
#include <cpu_session/connection.h>
#include <pd_session/connection.h>
#include <region_map/client.h>
#include <cpu_thread/client.h>
/* NOVA includes */
#include <nova/native_thread.h>
#include <nova/cap_map.h>
namespace Vmm {
using namespace Genode;
class Vcpu_thread;
class Vcpu_other_pd;
class Vcpu_same_pd;
}
class Vmm::Vcpu_thread
{
public:
virtual Genode::addr_t exc_base() = 0;
virtual void start(Genode::addr_t) = 0;
};
class Vmm::Vcpu_other_pd : public Vmm::Vcpu_thread
{
private:
Genode::Capability<Genode::Pd_session> _pd_cap;
Genode::Affinity::Location _location;
Genode::Cpu_session *_cpu_session;
Genode::addr_t _exc_pt_sel;
public:
Vcpu_other_pd(Cpu_session * cpu_session,
Genode::Affinity::Location location,
Genode::Capability<Genode::Pd_session> pd_cap,
Genode::size_t = 0 /* stack_size */)
:
_pd_cap(pd_cap), _location(location), _cpu_session(cpu_session),
_exc_pt_sel(Genode::cap_map()->insert(Nova::NUM_INITIAL_VCPU_PT_LOG2))
{ }
void start(Genode::addr_t sel_ec)
{
using namespace Genode;
Thread_capability vcpu_vm =
_cpu_session->create_thread(_pd_cap, "vCPU",
_location, Cpu_session::Weight());
/* tell parent that this will be a vCPU */
Thread_state state;
state.sel_exc_base = _exc_pt_sel;
state.vcpu = true;
Cpu_thread_client cpu_thread(vcpu_vm);
cpu_thread.state(state);
/*
* Translate vcpu_vm thread cap via current executing thread,
* which is used to lookup current PD to delegate VM-exit portals.
*/
addr_t const current = Thread::myself()->native_thread().exc_pt_sel
+ Nova::PT_SEL_PAGE_FAULT;
translate_remote_pager(current, vcpu_vm.local_name());
/* start vCPU in separate PD */
cpu_thread.start(0, 0);
/*
* Request native EC thread cap and put it next to the
* SM cap - see Vcpu_dispatcher->sel_sm_ec description
*/
addr_t const pager_pt = _exc_pt_sel + Nova::PT_SEL_PAGE_FAULT;
request_native_ec_cap(pager_pt, sel_ec);
/* solely needed for vcpu to request native ec cap - drop it */
Nova::revoke(Nova::Obj_crd(pager_pt, 0));
/* request creation of SC to let vCPU run */
cpu_thread.resume();
}
Genode::addr_t exc_base() { return _exc_pt_sel; }
};
class Vmm::Vcpu_same_pd : public Vmm::Vcpu_thread, Genode::Thread
{
enum { WEIGHT = Genode::Cpu_session::Weight::DEFAULT_WEIGHT };
public:
Vcpu_same_pd(Cpu_session * cpu_session,
Genode::Affinity::Location location,
Genode::Capability<Genode::Pd_session>,
Genode::size_t stack_size)
:
Thread(WEIGHT, "vCPU", stack_size, Type::NORMAL, cpu_session, location)
{
/* release pre-allocated selectors of Thread */
Genode::cap_map()->remove(native_thread().exc_pt_sel, Nova::NUM_INITIAL_PT_LOG2);
/* allocate correct number of selectors */
this->native_thread().exc_pt_sel = cap_map()->insert(Nova::NUM_INITIAL_VCPU_PT_LOG2);
/* tell generic thread code that this becomes a vCPU */
this->native_thread().vcpu = true;
}
~Vcpu_same_pd()
{
using namespace Nova;
revoke(Nova::Obj_crd(this->native_thread().exc_pt_sel, NUM_INITIAL_VCPU_PT_LOG2));
cap_map()->remove(this->native_thread().exc_pt_sel, NUM_INITIAL_VCPU_PT_LOG2, false);
/* allocate selectors for ~Thread */
this->native_thread().exc_pt_sel = cap_map()->insert(Nova::NUM_INITIAL_PT_LOG2);
}
addr_t exc_base() { return this->native_thread().exc_pt_sel; }
void start(Genode::addr_t sel_ec)
{
this->Thread::start();
/*
* Request native EC thread cap and put it next to the
* SM cap - see Vcpu_dispatcher->sel_sm_ec description
*/
addr_t const pager_pt = exc_base() + Nova::PT_SEL_PAGE_FAULT;
request_native_ec_cap(pager_pt, sel_ec);
/* solely needed for vcpu to request native ec cap - drop it */
Nova::revoke(Nova::Obj_crd(pager_pt, 0));
}
void entry() { }
};
#endif /* _INCLUDE__VMM__VCPU_THREAD_H_ */