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base-sel4: port to new VMM library API

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Ref #4968
This commit is contained in:
Benjamin Lamowski 2023-08-09 16:21:12 +02:00 committed by Christian Helmuth
parent 5136883ded
commit 1515a0a51e
1 changed files with 92 additions and 28 deletions
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126
repos/base-sel4/src/lib/base/x86/vm.cc
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@ -1,11 +1,12 @@
/*
* \brief Client-side VM session interface
* \author Alexander Boettcher
* \author Benjamin Lamowski
* \date 2018-08-27
*/
/*
* Copyright (C) 2018-2021 Genode Labs GmbH
* Copyright (C) 2018-2023 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.
@ -16,6 +17,7 @@
#include <base/attached_dataspace.h>
#include <base/env.h>
#include <base/registry.h>
#include <base/sleep.h>
#include <vm_session/connection.h>
#include <vm_session/handler.h>
@ -36,6 +38,7 @@
using namespace Genode;
using Exit_config = Vm_connection::Exit_config;
using Call_with_state = Vm_connection::Call_with_state;
struct Sel4_vcpu;
@ -71,11 +74,16 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
private:
Vcpu_handler_base &_vcpu_handler;
Vcpu_handler<Sel4_vcpu> _exit_handler;
Vcpu_state _state __attribute__((aligned(0x10))) { };
Semaphore _wake_up { 0 };
Blockade _startup { };
addr_t _recall { 0 };
uint64_t _tsc_offset { 0 };
Semaphore _state_ready { 0 };
bool _dispatching { false };
bool _extra_dispatch_up { false };
void *_ep_handler { nullptr };
Constructible<Sel4_native_rpc> _rpc { };
@ -133,7 +141,7 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
/* get selector to call back a vCPU into VMM */
_recall = _stack->utcb().lock_sel();
Vcpu_state &state = this->state();
Vcpu_state &state = _state;
state.discharge();
/* wait for first user resume() */
@ -148,9 +156,10 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
state.exit_reason = VMEXIT_STARTUP;
_read_sel4_state(service, state);
Genode::Signal_transmitter(_vcpu_handler.signal_cap()).submit();
_state_ready.up();
Signal_transmitter(_exit_handler.signal_cap()).submit();
_vcpu_handler.ready_semaphore().down();
_exit_handler.ready_semaphore().down();
_wake_up.down();
State local_state { NONE };
@ -192,14 +201,13 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
_read_sel4_state(service, state);
/* notify VM handler */
Genode::Signal_transmitter(_vcpu_handler.signal_cap()).submit();
_state_ready.up();
if (_extra_dispatch_up) {
_extra_dispatch_up = false;
_exit_handler.ready_semaphore().down();
}
/*
* Wait until VM handler is really really done,
* otherwise we lose state.
*/
_vcpu_handler.ready_semaphore().down();
continue;
}
@ -219,8 +227,18 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
state.discharge();
if (res != SEL4_VMENTER_RESULT_FAULT)
/*
* If a VMEXIT_RECALL is dispatched here, it comes from a
* pause request sent by an already running asynchronous signal
* handler.
* In that case, don't dispatch an extra exit signal.
*/
bool skip_dispatch = false;
if (res != SEL4_VMENTER_RESULT_FAULT) {
state.exit_reason = VMEXIT_RECALL;
skip_dispatch = true;
}
else
state.exit_reason = (unsigned)seL4_GetMR(SEL4_VMENTER_FAULT_REASON_MR);
@ -233,15 +251,18 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
_wake_up.down();
}
}
_state_ready.up();
if (skip_dispatch)
continue;
/* notify VM handler */
Genode::Signal_transmitter(_vcpu_handler.signal_cap()).submit();
Genode::Signal_transmitter(_exit_handler.signal_cap()).submit();
/*
* Wait until VM handler is really really done,
* otherwise we lose state.
*/
_vcpu_handler.ready_semaphore().down();
_exit_handler.ready_semaphore().down();
}
}
@ -747,6 +768,13 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
return ep->affinity();
}
void _wrapper_dispatch()
{
_dispatching = true;
_vcpu_handler.dispatch(1);
_dispatching = false;
}
public:
Sel4_vcpu(Env &env, Vm_connection &vm,
@ -754,12 +782,14 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
:
Thread(env, "vcpu_thread", STACK_SIZE, _location(handler),
Weight(), env.cpu()),
_vcpu_handler(handler)
_vcpu_handler(handler),
_exit_handler(handler.ep(), *this, &Sel4_vcpu::_wrapper_dispatch)
{
Thread::start();
/* wait until thread is alive, e.g. Thread::cap() is valid */
_startup.block();
_ep_handler = reinterpret_cast<Thread *>(&handler.rpc_ep());
_rpc.construct(vm, this->cap(), *this);
@ -767,6 +797,9 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
_wake_up.up();
}
const Sel4_vcpu& operator=(const Sel4_vcpu &) = delete;
Sel4_vcpu(const Sel4_vcpu&) = delete;
void resume()
{
Mutex::Guard guard(_remote_mutex);
@ -778,21 +811,52 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
_wake_up.up();
}
void pause()
void with_state(Call_with_state &cw)
{
Mutex::Guard guard(_remote_mutex);
if (_remote == PAUSE)
return;
_remote = PAUSE;
seL4_Signal(_recall);
_wake_up.up();
if (!_dispatching) {
if (Thread::myself() != _ep_handler) {
error("vCPU state requested outside of vcpu_handler EP");
sleep_forever();
}
_remote_mutex.acquire();
/* Trigger pause exit */
_remote = PAUSE;
seL4_Signal(_recall);
_wake_up.up();
_remote_mutex.release();
_state_ready.down();
/*
* We're in the async dispatch, yet processing a non-pause exit.
* Signal that we have to wrap the dispatch loop around.
*/
if (_state.exit_reason != VMEXIT_RECALL) {
_extra_dispatch_up = true;
}
} else {
_state_ready.down();
}
if (cw.call_with_state(_state)
|| _extra_dispatch_up)
resume();
/*
* The regular exit was handled by the asynchronous dispatch handler
* triggered by the pause request.
*
* Fake finishing the exit dispatch so that the vCPU loop
* processes the asynchronously dispatched exit and provides
* the VMEXIT_RECALL to the already pending dispatch function
* for the exit code.
*/
if (!_dispatching && _extra_dispatch_up)
_exit_handler.ready_semaphore().up();
}
Vcpu_state & state() { return _state; }
Sel4_native_rpc * rpc() { return &*_rpc; }
};
@ -800,13 +864,13 @@ struct Sel4_vcpu : Genode::Thread, Noncopyable
** vCPU API **
**************/
void Vm_connection::Vcpu::run() { static_cast<Sel4_native_rpc &>(_native_vcpu).vcpu.resume(); }
void Vm_connection::Vcpu::pause() { static_cast<Sel4_native_rpc &>(_native_vcpu).vcpu.pause(); }
Vcpu_state & Vm_connection::Vcpu::state() { return static_cast<Sel4_native_rpc &>(_native_vcpu).vcpu.state(); }
void Vm_connection::Vcpu::_with_state(Call_with_state &cw) { static_cast<Sel4_native_rpc &>(_native_vcpu).vcpu.with_state(cw); }
Vm_connection::Vcpu::Vcpu(Vm_connection &vm, Allocator &alloc,
Vcpu_handler_base &handler, Exit_config const &exit_config)
:
_native_vcpu(*((new (alloc) Sel4_vcpu(vm._env, vm, handler, exit_config))->rpc()))
{ }
{
static_cast<Sel4_native_rpc &>(_native_vcpu).vcpu.resume();
}