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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
kvm-all.c
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@ -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;
}