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kvm: Separate TCG from KVM cpu execution

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Mixing up TCG bits with KVM already led to problems around eflags
emulation on x86. Moreover, quite some code that TCG requires on cpu
enty/exit is useless for KVM. So dispatch between tcg_cpu_exec and
kvm_cpu_exec as early as possible.

The core logic of cpu_halted from cpu_exec is added to
kvm_arch_process_irqchip_events. Moving away from cpu_exec makes
exception_index meaningless for KVM, we can simply pass the exit reason
directly (only "EXCP_DEBUG vs. rest" is relevant).

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2011-02-07 12:19:18 +01:00 committed by Marcelo Tosatti
parent 83f338f73e
commit 6792a57bf1
4 changed files with 23 additions and 31 deletions
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19
cpu-exec.c
View File

@ -226,13 +226,11 @@ int cpu_exec(CPUState *env1)
}
#if defined(TARGET_I386)
if (!kvm_enabled()) {
/* put eflags in CPU temporary format */
CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
DF = 1 - (2 * ((env->eflags >> 10) & 1));
CC_OP = CC_OP_EFLAGS;
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
}
/* put eflags in CPU temporary format */
CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
DF = 1 - (2 * ((env->eflags >> 10) & 1));
CC_OP = CC_OP_EFLAGS;
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
#elif defined(TARGET_SPARC)
#elif defined(TARGET_M68K)
env->cc_op = CC_OP_FLAGS;
@ -257,7 +255,7 @@ int cpu_exec(CPUState *env1)
if (setjmp(env->jmp_env) == 0) {
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
#undef env
env = cpu_single_env;
env = cpu_single_env;
#define env cpu_single_env
#endif
/* if an exception is pending, we execute it here */
@ -316,11 +314,6 @@ int cpu_exec(CPUState *env1)
}
}
if (kvm_enabled()) {
kvm_cpu_exec(env);
longjmp(env->jmp_env, 1);
}
next_tb = 0; /* force lookup of first TB */
for(;;) {
interrupt_request = env->interrupt_request;

10
cpus.c
View File

@ -800,8 +800,6 @@ static void qemu_kvm_wait_io_event(CPUState *env)
qemu_wait_io_event_common(env);
}
static int qemu_cpu_exec(CPUState *env);
static void *qemu_kvm_cpu_thread_fn(void *arg)
{
CPUState *env = arg;
@ -829,7 +827,7 @@ static void *qemu_kvm_cpu_thread_fn(void *arg)
while (1) {
if (cpu_can_run(env)) {
r = qemu_cpu_exec(env);
r = kvm_cpu_exec(env);
if (r == EXCP_DEBUG) {
cpu_handle_debug_exception(env);
}
@ -1040,7 +1038,7 @@ void vm_stop(int reason)
#endif
static int qemu_cpu_exec(CPUState *env)
static int tcg_cpu_exec(CPUState *env)
{
int ret;
#ifdef CONFIG_PROFILER
@ -1095,9 +1093,11 @@ bool cpu_exec_all(void)
break;
}
if (cpu_can_run(env)) {
r = qemu_cpu_exec(env);
if (kvm_enabled()) {
r = kvm_cpu_exec(env);
qemu_kvm_eat_signals(env);
} else {
r = tcg_cpu_exec(env);
}
if (r == EXCP_DEBUG) {
cpu_handle_debug_exception(env);

19
kvm-all.c
View File

@ -895,10 +895,11 @@ int kvm_cpu_exec(CPUState *env)
if (kvm_arch_process_irqchip_events(env)) {
env->exit_request = 0;
env->exception_index = EXCP_HLT;
return 0;
return EXCP_HLT;
}
cpu_single_env = env;
do {
if (env->kvm_vcpu_dirty) {
kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
@ -927,7 +928,6 @@ int kvm_cpu_exec(CPUState *env)
kvm_flush_coalesced_mmio_buffer();
if (ret == -EINTR || ret == -EAGAIN) {
cpu_exit(env);
DPRINTF("io window exit\n");
ret = 0;
break;
@ -978,8 +978,8 @@ int kvm_cpu_exec(CPUState *env)
DPRINTF("kvm_exit_debug\n");
#ifdef KVM_CAP_SET_GUEST_DEBUG
if (kvm_arch_debug(&run->debug.arch)) {
env->exception_index = EXCP_DEBUG;
return 0;
ret = EXCP_DEBUG;
goto out;
}
/* re-enter, this exception was guest-internal */
ret = 1;
@ -995,13 +995,12 @@ int kvm_cpu_exec(CPUState *env)
if (ret < 0) {
cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
vm_stop(VMSTOP_PANIC);
env->exit_request = 1;
}
if (env->exit_request) {
env->exit_request = 0;
env->exception_index = EXCP_INTERRUPT;
}
ret = EXCP_INTERRUPT;
out:
env->exit_request = 0;
cpu_single_env = NULL;
return ret;
}

6
target-i386/kvm.c
View File

@ -1502,12 +1502,13 @@ int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
int kvm_arch_process_irqchip_events(CPUState *env)
{
if (env->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI)) {
env->halted = 0;
}
if (env->interrupt_request & CPU_INTERRUPT_INIT) {
kvm_cpu_synchronize_state(env);
do_cpu_init(env);
env->exception_index = EXCP_HALTED;
}
if (env->interrupt_request & CPU_INTERRUPT_SIPI) {
kvm_cpu_synchronize_state(env);
do_cpu_sipi(env);
@ -1522,7 +1523,6 @@ static int kvm_handle_halt(CPUState *env)
(env->eflags & IF_MASK)) &&
!(env->interrupt_request & CPU_INTERRUPT_NMI)) {
env->halted = 1;
env->exception_index = EXCP_HLT;
return 0;
}