qemu/cpu-exec-common.c
Peter Maydell 32857f4d5e exec.c: Collect AddressSpace related fields into a CPUAddressSpace struct
Gather up all the fields currently in CPUState which deal with the CPU's
AddressSpace into a separate CPUAddressSpace struct. This paves the way
for allowing the CPU to know about more than one AddressSpace.

The rearrangement also allows us to make the MemoryListener a directly
embedded object in the CPUAddressSpace (it could not be embedded in
CPUState because 'struct MemoryListener' isn't defined for the user-only
builds). This allows us to resolve the FIXME in tcg_commit() by going
directly from the MemoryListener to the CPUAddressSpace.

This patch extracts the actual update of the cached dispatch pointer
from cpu_reload_memory_map() (which is renamed accordingly to
cpu_reloading_memory_map() as it is only responsible for breaking
cpu-exec.c's RCU critical section now). This lets us keep the definition
of the CPUAddressSpace struct private to exec.c.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <1443709790-25180-4-git-send-email-peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-10-12 18:29:26 +02:00

83 lines
2.8 KiB
C

/*
* emulator main execution loop
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "cpu.h"
#include "sysemu/cpus.h"
#include "exec/memory-internal.h"
bool exit_request;
CPUState *tcg_current_cpu;
/* exit the current TB from a signal handler. The host registers are
restored in a state compatible with the CPU emulator
*/
#if defined(CONFIG_SOFTMMU)
void cpu_resume_from_signal(CPUState *cpu, void *puc)
{
/* XXX: restore cpu registers saved in host registers */
cpu->exception_index = -1;
siglongjmp(cpu->jmp_env, 1);
}
void cpu_reloading_memory_map(void)
{
if (qemu_in_vcpu_thread()) {
/* The guest can in theory prolong the RCU critical section as long
* as it feels like. The major problem with this is that because it
* can do multiple reconfigurations of the memory map within the
* critical section, we could potentially accumulate an unbounded
* collection of memory data structures awaiting reclamation.
*
* Because the only thing we're currently protecting with RCU is the
* memory data structures, it's sufficient to break the critical section
* in this callback, which we know will get called every time the
* memory map is rearranged.
*
* (If we add anything else in the system that uses RCU to protect
* its data structures, we will need to implement some other mechanism
* to force TCG CPUs to exit the critical section, at which point this
* part of this callback might become unnecessary.)
*
* This pair matches cpu_exec's rcu_read_lock()/rcu_read_unlock(), which
* only protects cpu->as->dispatch. Since we know our caller is about
* to reload it, it's safe to split the critical section.
*/
rcu_read_unlock();
rcu_read_lock();
}
}
#endif
void cpu_loop_exit(CPUState *cpu)
{
cpu->current_tb = NULL;
siglongjmp(cpu->jmp_env, 1);
}
void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
{
if (pc) {
cpu_restore_state(cpu, pc);
}
cpu->current_tb = NULL;
siglongjmp(cpu->jmp_env, 1);
}