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NOVA: Use Genode interfaces to bootstrap Vancouver

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Since no kernel objects can be created anymore outside Genode::core,
the Vancouver port must be adjusted to use solely the Genode interfaces.

The Vcpu_dispatcher creates all portals via the cpu_session interface and
uses the feature to setup a specific receive window during a IPC (the
cap_session::alloc IPC) to place to be received/to be mapped capability
(virtualization exception portal) at the designed indexes.

The actual vCPU thread extends from a normal Genode::Thread and extends it
by specific vCPU requirements, which are a larger exception base window and
the need by Vancouver to place the SM and EC cap at indexes next to each other.

Fixes #316
This commit is contained in:
Alexander Boettcher 2012-08-09 10:51:09 +02:00 committed by Norman Feske
parent 135a5a6bfb
commit a7235d2411
3 changed files with 192 additions and 142 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
base-nova/src/base/thread/thread_nova.cc
View File

@ -129,10 +129,8 @@ void Thread_base::start()
/* request exception portals for normal threads */
if (!_tid.is_vcpu) {
request_event_portal(pager_cap, _tid.exc_pt_sel,
PT_SEL_STARTUP);
request_event_portal(pager_cap, _tid.exc_pt_sel,
PT_SEL_PAGE_FAULT);
request_event_portal(pager_cap, _tid.exc_pt_sel, PT_SEL_STARTUP);
request_event_portal(pager_cap, _tid.exc_pt_sel, PT_SEL_PAGE_FAULT);
request_event_portal(pager_cap, _tid.exc_pt_sel, SM_SEL_EC);
}

326
ports/src/vancouver/main.cc
View File

@ -32,9 +32,12 @@
#include <base/sleep.h>
#include <base/cap_sel_alloc.h>
#include <base/thread.h>
#include <base/rpc_server.h>
#include <rom_session/connection.h>
#include <rm_session/connection.h>
#include <cap_session/connection.h>
#include <os/config.h>
#include <nova_cpu_session/connection.h>
/* NOVA includes that come with Genode */
#include <nova/syscalls.h>
@ -52,7 +55,8 @@
enum {
PAGE_SIZE_LOG2 = 12UL,
PAGE_SIZE = 1UL << PAGE_SIZE_LOG2
PAGE_SIZE = 1UL << PAGE_SIZE_LOG2,
STACK_SIZE = 4096,
};
@ -65,7 +69,7 @@ enum { verbose_io = false };
*
* Used for startup synchronization and coarse-grained locking.
*/
Semaphore _lock;
Genode::Lock global_lock(Genode::Lock::LOCKED);
/**
@ -165,22 +169,84 @@ class Guest_memory
}
};
class Vcpu_thread : Genode::Thread<STACK_SIZE> {
class Vcpu_dispatcher : Genode::Thread_base,
private:
/**
* Log2 size of portal window used for virtualization events
*/
enum { VCPU_EXC_BASE_LOG2 = 8 };
public:
Vcpu_thread(char const * name) : Thread(name)
{
/* release pre-allocated selectors of Thread */
Genode::cap_selector_allocator()->
free(tid().exc_pt_sel,
Nova::NUM_INITIAL_PT_LOG2);
/* allocate correct number of selectors */
tid().exc_pt_sel = Genode::cap_selector_allocator()->
alloc(VCPU_EXC_BASE_LOG2);
/* tell generic thread code that this becomes a vCPU */
tid().is_vcpu = true;
}
~Vcpu_thread()
{
using namespace Nova;
revoke(Obj_crd(tid().exc_pt_sel, VCPU_EXC_BASE_LOG2));
Genode::cap_selector_allocator()->
free(tid().exc_pt_sel, VCPU_EXC_BASE_LOG2);
/* allocate selectors for ~Thread */
tid().exc_pt_sel = Genode::cap_selector_allocator()->
alloc(NUM_INITIAL_PT_LOG2);
}
Genode::addr_t exc_base() { return tid().exc_pt_sel; }
void start() {
this->Thread_base::start();
using namespace Genode;
/*
* Request native EC thread cap and put it next to the
* SM cap - see Vcpu_dispatcher->sel_sm_ec description
*/
addr_t sel_ec = tid().exc_pt_sel + Nova::SM_SEL_EC + 1;
Nova_cpu_connection cpu;
/* Use selector next to SM cap to retrieve EC cap */
cpu.rcv_window(sel_ec);
Native_capability ec_cap = cpu.native_cap(_thread_cap);
if (!ec_cap.valid() || sel_ec != ec_cap.local_name())
Logging::panic("Could not collocate EC cap");
}
void entry() { }
};
class Vcpu_dispatcher : public Genode::Thread<STACK_SIZE>,
public StaticReceiver<Vcpu_dispatcher>
{
private:
/**
* Stack size of vCPU event handler
*/
enum { STACK_SIZE = 4096 };
/**
* Pointer to corresponding VCPU model
*/
VCpu * const _vcpu;
Vcpu_thread _vcpu_thread;
/**
* Guest-physical memory
*/
@ -191,29 +257,6 @@ class Vcpu_dispatcher : Genode::Thread_base,
*/
Motherboard &_motherboard;
/**
* Base of portal window where the handlers for virtualization events
* will be registered. This window will be passed to the vCPU EC at
* creation time.
*/
Nova::mword_t const _ev_pt_sel_base;
/**
* Size of portal window used for virtualization events, in log2
*/
enum { EV_PT_WINDOW_SIZE_LOG2 = 8 };
/**
* Capability selector used for the VCPU's execution context
*/
Genode::addr_t const _sm_sel;
Genode::addr_t const _ec_sel;
/**
* Capability selector used for the VCPU's scheduling context
*/
Genode::addr_t const _sc_sel;
/***************
** Shortcuts **
@ -225,11 +268,10 @@ class Vcpu_dispatcher : Genode::Thread_base,
static void _free_sel(Nova::mword_t sel, Genode::size_t num_caps_log2 = 0) {
Genode::cap_selector_allocator()->free(sel, num_caps_log2); }
static Nova::mword_t _pd_sel() {
return Genode::cap_selector_allocator()->pd_sel(); }
static Nova::mword_t _pd_sel() { return 0; }
static ::Utcb *_utcb_of_myself() {
return (::Utcb *)Thread_base::myself()->utcb(); }
return (::Utcb *)Genode::Thread_base::myself()->utcb(); }
/***********************************
@ -262,7 +304,7 @@ class Vcpu_dispatcher : Genode::Thread_base,
if (skip == SKIP)
_skip_instruction(msg);
SemaphoreGuard guard(_lock);
Genode::Lock::Guard guard(global_lock);
/**
* Send the message to the VCpu.
@ -333,14 +375,15 @@ class Vcpu_dispatcher : Genode::Thread_base,
Logging::printf("NPT mapping (base=0x%lx, order=%d hotspot=0x%lx)\n",
crd.base(), crd.order(), hotspot);
Nova::Utcb * u = (Nova::Utcb *)utcb;
u->set_msg_word(0);
u->append_item(crd, hotspot, false, true);
/* EPT violation during IDT vectoring? */
if (utcb->inj_info & 0x80000000)
Logging::panic("EPT violation during IDT vectoring - not handled\n");
Nova::Utcb * u = (Nova::Utcb *)utcb;
u->set_msg_word(0);
if (!u->append_item(crd, hotspot, false, true))
Logging::printf("Could not map everything");
return true;
}
@ -354,7 +397,7 @@ class Vcpu_dispatcher : Genode::Thread_base,
CpuMessage msg(is_in, static_cast<CpuState *>(utcb), io_order, port, &utcb->eax, utcb->mtd);
_skip_instruction(msg);
{
SemaphoreGuard l(_lock);
Genode::Lock::Guard l(global_lock);
if (!_vcpu->executor.send(msg, true))
Logging::panic("nobody to execute %s at %x:%x\n", __func__, msg.cpu->cs.sel, msg.cpu->eip);
}
@ -430,7 +473,7 @@ class Vcpu_dispatcher : Genode::Thread_base,
static void _portal_entry()
{
/* obtain this pointer of the event handler */
Thread_base *myself = Thread_base::myself();
Genode::Thread_base *myself = Genode::Thread_base::myself();
Vcpu_dispatcher *vd = static_cast<Vcpu_dispatcher *>(myself);
/* call event-specific handler function */
@ -444,73 +487,108 @@ class Vcpu_dispatcher : Genode::Thread_base,
* Register virtualization event handler
*/
template <unsigned EV, void (Vcpu_dispatcher::*FUNC)()>
void _register_handler(Nova::Mtd mtd)
void _register_handler(Genode::addr_t exc_base, Nova::Mtd mtd)
{
/* let the compiler generate an instance of a portal entry */
/*
* Let the compiler generate an instance of a portal
* entry
*/
void (*portal_entry)() = &_portal_entry<EV, FUNC>;
Nova::create_pt(_ev_pt_sel_base + EV, _pd_sel(),
_tid.ec_sel, mtd, (Nova::mword_t)portal_entry);
using namespace Genode;
/* Create the portal at the desired selector index */
Cap_connection conn;
conn.rcv_window(exc_base + EV);
Native_capability thread(tid().ec_sel);
Native_capability handler =
conn.alloc(thread, (Nova::mword_t)portal_entry,
mtd.value());
if (!handler.valid() ||
exc_base + EV != handler.local_name())
Logging::panic("Could not get EC cap");
}
public:
Vcpu_dispatcher(VCpu *vcpu,
Guest_memory &guest_memory,
Motherboard &motherboard,
bool has_svm,
unsigned cpu_number)
Vcpu_dispatcher(VCpu *vcpu,
Guest_memory &guest_memory,
Motherboard &motherboard,
Genode::Cap_connection &cap_session,
bool has_svm,
unsigned cpu_number)
:
Genode::Thread_base("vcpu_handler", STACK_SIZE),
_vcpu(vcpu),
_vcpu_thread("vCPU thread"),
_guest_memory(guest_memory),
_motherboard(motherboard),
_ev_pt_sel_base(_alloc_sel(EV_PT_WINDOW_SIZE_LOG2)),
_sm_sel(_alloc_sel(1)),
_ec_sel(_sm_sel + 1),
_sc_sel(_alloc_sel())
_motherboard(motherboard)
{
using namespace Genode;
/* create new pager object and assign it to the new thread */
Pager_capability pager_cap =
env()->rm_session()->add_client(_thread_cap);
if (!pager_cap.valid())
throw Cpu_session::Thread_creation_failed();
if (env()->cpu_session()->set_pager(_thread_cap, pager_cap))
throw Cpu_session::Thread_creation_failed();
addr_t thread_sp = (addr_t)&_context->stack[-4];
Genode::Nova_cpu_connection cpu;
cpu.start_exc_base_vcpu(_thread_cap, 0, thread_sp,
_tid.exc_pt_sel);
request_event_portal(pager_cap, _tid.exc_pt_sel,
Nova::PT_SEL_PAGE_FAULT);
request_event_portal(pager_cap, _tid.exc_pt_sel,
Nova::SM_SEL_EC);
/**
* Request native thread cap, _thread_cap only a token.
* The native thread cap is required to attach new rpc objects
* (to create portals bound to the ec)
*/
Native_capability ec_cap = cpu.native_cap(_thread_cap);
_tid.ec_sel = ec_cap.local_name();
/* init utcb of dispatcher thread */
Nova::Utcb * utcb = reinterpret_cast<Nova::Utcb *>(&_context->utcb);
utcb->set_msg_word(0);
utcb->crd_xlt = Nova::Crd(0);
utcb->crd_rcv = Nova::Crd(0);
using namespace Nova;
/*
* Stack and UTCB of local EC used as VCPU event handler
*/
mword_t *const sp = (mword_t * const)_context->stack;
mword_t const utcb = (mword_t) &_context->utcb;
/*
* XXX: Propagate the specified CPU number. For now, we ignore
* the 'cpu_number' argument.
*/
/*
* Create local EC used handling virtualization events. This EC has
* is executed with the CPU time donated by the guest OS.
*/
enum { CPU_NUMBER = 0, GLOBAL_NO = false };
if (create_ec(_tid.ec_sel, _pd_sel(),
CPU_NUMBER, utcb, (mword_t)sp,
_tid.exc_pt_sel, GLOBAL_NO))
PERR("create_ec failed while creating the handler EC");
/* shortcuts for common message-transfer descriptors */
Mtd const mtd_all(Mtd::ALL);
Mtd const mtd_cpuid(Mtd::EIP | Mtd::ACDB | Mtd::IRQ);
Mtd const mtd_irq(Mtd::IRQ);
/*
* Register VCPU SVM event handlers
* Register vCPU event handlers
*/
typedef Vcpu_dispatcher This;
if (has_svm) {
Genode::addr_t exc_base =
_vcpu_thread.exc_base();
_register_handler<0x72, &This::_svm_cpuid> (mtd_cpuid);
_register_handler<0x7b, &This::_svm_ioio> (mtd_all);
_register_handler<0x7c, &This::_svm_msr> (mtd_all);
_register_handler<0xfc, &This::_svm_npt> (mtd_all);
_register_handler<0xfd, &This::_svm_invalid> (mtd_all);
_register_handler<0xfe, &This::_svm_startup> (mtd_all);
_register_handler<0xff, &This::_recall> (mtd_irq);
_register_handler<0x72, &This::_svm_cpuid>
(exc_base, mtd_cpuid);
_register_handler<0x7b, &This::_svm_ioio>
(exc_base, mtd_all);
_register_handler<0x7c, &This::_svm_msr>
(exc_base, mtd_all);
_register_handler<0xfc, &This::_svm_npt>
(exc_base, mtd_all);
_register_handler<0xfd, &This::_svm_invalid>
(exc_base, mtd_all);
_register_handler<0xfe, &This::_svm_startup>
(exc_base, mtd_all);
_register_handler<0xff, &This::_recall>
(exc_base, mtd_irq);
} else {
@ -520,27 +598,8 @@ class Vcpu_dispatcher : Genode::Thread_base,
Logging::panic("no SVM available, sorry");
}
/*
* Create semaphore used as mechanism for blocking the VCPU
*/
if (create_sm(_sm_sel, _pd_sel(), 0))
PERR("create_rm returned failed while creating VCPU");
/*
* Create EC for virtual CPU. The virtual CPU is a global EC
* because it executes on an own budget of CPU time.
*/
enum { GLOBAL_YES = true, UTCB_VCPU = 0 };
if (create_ec(_ec_sel, _pd_sel(), CPU_NUMBER, UTCB_VCPU,
0, _ev_pt_sel_base, GLOBAL_YES))
PERR("create_ec failed while creating VCPU");
/*
* Fuel the VCPU with CPU time by attaching a scheduling context to
* it.
*/
if (create_sc(_sc_sel, _pd_sel(), _ec_sel, Nova::Qpd()))
PERR("create_sc failed while creating VCPU");
/* let vCPU run */
_vcpu_thread.start();
/* handle cpuid overrides */
vcpu->executor.add(this, receive_static<CpuMessage>);
@ -549,37 +608,32 @@ class Vcpu_dispatcher : Genode::Thread_base,
/**
* Destructor
*/
~Vcpu_dispatcher()
{
_free_sel(_ev_pt_sel_base, EV_PT_WINDOW_SIZE_LOG2);
_free_sel(_ec_sel, 0);
_free_sel(_sc_sel, 0);
}
~Vcpu_dispatcher() { }
/**
* Unused member of the 'Thread_base' interface
*
* Similarly to how 'Rpc_entrypoints' are handled, a 'Vcpu_dispatcher'
* comes with a custom initialization procedure, which does not call
* the thread's normal entry function. Instread, the thread's EC gets
* associated with several portals, each for handling a specific
* virtualization event.
* Similarly to how 'Rpc_entrypoints' are handled, a
* 'Vcpu_dispatcher' comes with a custom initialization
* procedure, which does not call the thread's normal entry
* function. Instead, the thread's EC gets associated with
* several portals, each for handling a specific virtualization
* event.
*/
void entry() { }
/**
* Return capability selector of the VCPU's SM and EC
*
* The returned number corresponds to the VCPU's semaphore selector.
* The consecutive number corresponds to the EC. The number returned by
* this function is used by the VMM code as a unique identifyer of the
* VCPU. I.e., it gets passed as arguments for 'MessageHostOp'
* operations.
*
* XXX: Couldn't we just use the 'Vcpu_dispatcher' as unique
* identifier instead?
* The returned number corresponds to the VCPU's semaphore
* selector. The consecutive number corresponds to the EC. The
* number returned by this function is used by the VMM code as
* a unique identifier of the VCPU. I.e., it gets passed as
* arguments for 'MessageHostOp' operations.
*/
Nova::mword_t sm_ec_sel_base() const { return _sm_sel; }
Nova::mword_t sel_sm_ec() {
return _vcpu_thread.exc_base() + Nova::SM_SEL_EC;
}
/***********************************
@ -658,15 +712,17 @@ class Machine : public StaticReceiver<Machine>
case MessageHostOp::OP_VCPU_CREATE_BACKEND:
{
Logging::printf("OP_VCPU_CREATE_BACKEND\n");
static Genode::Cap_connection cap_session;
/*
* XXX determine real CPU number, hardcoded CPU 0 for now
*/
enum { CPU_NUMBER = 0 };
Vcpu_dispatcher *vcpu_dispatcher =
new Vcpu_dispatcher(msg.vcpu, _guest_memory, _motherboard,
new Vcpu_dispatcher(msg.vcpu, _guest_memory, _motherboard, cap_session,
_hip->has_svm(), CPU_NUMBER);
msg.value = vcpu_dispatcher->sm_ec_sel_base();
msg.value = vcpu_dispatcher->sel_sm_ec();
return true;
}
@ -686,11 +742,11 @@ class Machine : public StaticReceiver<Machine>
{
Logging::printf("OP_VCPU_BLOCK\n");
_lock.up();
global_lock.lock();
Logging::printf("going to block\n");
bool res = (Nova::sm_ctrl(msg.value, Nova::SEMAPHORE_DOWN) == 0);
Logging::printf("woke up from vcpu sem, block on _lock\n");
_lock.down();
Logging::printf("woke up from vcpu sem, block on global_lock\n");
global_lock.unlock();
return res;
}
@ -966,7 +1022,7 @@ class Machine : public StaticReceiver<Machine>
MessageLegacy msg2(MessageLegacy::RESET, 0);
_motherboard.bus_legacy.send_fifo(msg2);
_lock.up();
global_lock.unlock();
Logging::printf("INIT done\n");
}
@ -981,10 +1037,6 @@ int main(int argc, char **argv)
{
Genode::printf("--- Vancouver VMM started ---\n");
_lock = Semaphore(Genode::cap_selector_allocator()->alloc());
if (Nova::create_sm(_lock.sm(), Genode::cap_selector_allocator()->pd_sel(), 0))
PWRN("_lock creation failed");
static Boot_module_provider
boot_modules(Genode::config()->xml_node().sub_node("multiboot"));

2
ports/src/vancouver/target.mk
View File

@ -10,7 +10,7 @@ ifeq ($(wildcard $(VANCOUVER_DIR)),)
REQUIRES += prepare_ports_vancouver
endif
LIBS += cxx env thread
LIBS += cxx env thread server
SRC_CC = main.cc nova_user_env.cc device_model_registry.cc
#