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kvm: x86: Prepare VCPU loop for in-kernel irqchip

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Effectively no functional change yet as kvm_irqchip_in_kernel still only
returns 0, but this patch will allow qemu-kvm to adopt the VCPU loop of
upsteam KVM.

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 12:19:19 +01:00 • committed by Marcelo Tosatti
parent 6792a57bf1
commit db1669bcca
1 changed files with 38 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

69
target-i386/kvm.c
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@ -1442,11 +1442,6 @@ int kvm_arch_get_registers(CPUState *env)
int kvm_arch_pre_run(CPUState *env, struct kvm_run *run) int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
{ {
/* Force the VCPU out of its inner loop to process the INIT request */
if (env->interrupt_request & CPU_INTERRUPT_INIT) {
env->exit_request = 1;
}
/* Inject NMI */ /* Inject NMI */
if (env->interrupt_request & CPU_INTERRUPT_NMI) { if (env->interrupt_request & CPU_INTERRUPT_NMI) {
env->interrupt_request &= ~CPU_INTERRUPT_NMI; env->interrupt_request &= ~CPU_INTERRUPT_NMI;
@ -1454,35 +1449,43 @@ int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
kvm_vcpu_ioctl(env, KVM_NMI); kvm_vcpu_ioctl(env, KVM_NMI);
} }
/* Try to inject an interrupt if the guest can accept it */ if (!kvm_irqchip_in_kernel()) {
if (run->ready_for_interrupt_injection && /* Force the VCPU out of its inner loop to process the INIT request */
(env->interrupt_request & CPU_INTERRUPT_HARD) && if (env->interrupt_request & CPU_INTERRUPT_INIT) {
(env->eflags & IF_MASK)) { env->exit_request = 1;
int irq;
env->interrupt_request &= ~CPU_INTERRUPT_HARD;
irq = cpu_get_pic_interrupt(env);
if (irq >= 0) {
struct kvm_interrupt intr;
intr.irq = irq;
/* FIXME: errors */
DPRINTF("injected interrupt %d\n", irq);
kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
} }
}
/* If we have an interrupt but the guest is not ready to receive an /* Try to inject an interrupt if the guest can accept it */
* interrupt, request an interrupt window exit. This will if (run->ready_for_interrupt_injection &&
* cause a return to userspace as soon as the guest is ready to (env->interrupt_request & CPU_INTERRUPT_HARD) &&
* receive interrupts. */ (env->eflags & IF_MASK)) {
if ((env->interrupt_request & CPU_INTERRUPT_HARD)) { int irq;
run->request_interrupt_window = 1;
} else {
run->request_interrupt_window = 0;
}
DPRINTF("setting tpr\n"); env->interrupt_request &= ~CPU_INTERRUPT_HARD;
run->cr8 = cpu_get_apic_tpr(env->apic_state); irq = cpu_get_pic_interrupt(env);
if (irq >= 0) {
struct kvm_interrupt intr;
intr.irq = irq;
/* FIXME: errors */
DPRINTF("injected interrupt %d\n", irq);
kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
}
}
/* If we have an interrupt but the guest is not ready to receive an
* interrupt, request an interrupt window exit. This will
* cause a return to userspace as soon as the guest is ready to
* receive interrupts. */
if ((env->interrupt_request & CPU_INTERRUPT_HARD)) {
run->request_interrupt_window = 1;
} else {
run->request_interrupt_window = 0;
}
DPRINTF("setting tpr\n");
run->cr8 = cpu_get_apic_tpr(env->apic_state);
}
return 0; return 0;
} }
@ -1502,6 +1505,10 @@ int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
int kvm_arch_process_irqchip_events(CPUState *env) int kvm_arch_process_irqchip_events(CPUState *env)
{ {
if (kvm_irqchip_in_kernel()) {
return 0;
}
if (env->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI)) { if (env->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI)) {
env->halted = 0; env->halted = 0;
} }