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KVM: arm/arm64: implement kvm_arm_[halt,resume]_guest 

We introduce kvm_arm_halt_guest and resume functions. They
will be used for IRQ forward state change.

Halt is synchronous and prevents the guest from being re-entered.
We use the same mechanism put in place for PSCI former pause,
now renamed power_off. A new flag is introduced in arch vcpu state,
pause, only meant to be used by those functions.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2015-09-25 23:41:17 +02:00 committed by Christoffer Dall
parent 101d3da09c
commit 3b92830ad4
3 changed files with 37 additions and 4 deletions
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3
arch/arm/include/asm/kvm_host.h
View File

@ -129,6 +129,9 @@ struct kvm_vcpu_arch {
/* vcpu power-off state */
bool power_off;
/* Don't run the guest (internal implementation need) */
bool pause;
/* IO related fields */
struct kvm_decode mmio_decode;

35
arch/arm/kvm/arm.c
View File

@ -353,7 +353,7 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
&& !v->arch.power_off);
&& !v->arch.power_off && !v->arch.pause);
}
/* Just ensure a guest exit from a particular CPU */
@ -479,11 +479,38 @@ bool kvm_arch_intc_initialized(struct kvm *kvm)
return vgic_initialized(kvm);
}
static void kvm_arm_halt_guest(struct kvm *kvm) __maybe_unused;
static void kvm_arm_resume_guest(struct kvm *kvm) __maybe_unused;
static void kvm_arm_halt_guest(struct kvm *kvm)
{
int i;
struct kvm_vcpu *vcpu;
kvm_for_each_vcpu(i, vcpu, kvm)
vcpu->arch.pause = true;
force_vm_exit(cpu_all_mask);
}
static void kvm_arm_resume_guest(struct kvm *kvm)
{
int i;
struct kvm_vcpu *vcpu;
kvm_for_each_vcpu(i, vcpu, kvm) {
wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
vcpu->arch.pause = false;
wake_up_interruptible(wq);
}
}
static void vcpu_sleep(struct kvm_vcpu *vcpu)
{
wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
wait_event_interruptible(*wq, !vcpu->arch.power_off);
wait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
(!vcpu->arch.pause)));
}
static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
@ -533,7 +560,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
update_vttbr(vcpu->kvm);
if (vcpu->arch.power_off)
if (vcpu->arch.power_off || vcpu->arch.pause)
vcpu_sleep(vcpu);
/*
@ -561,7 +588,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
}
if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
vcpu->arch.power_off) {
vcpu->arch.power_off || vcpu->arch.pause) {
local_irq_enable();
kvm_timer_sync_hwstate(vcpu);
kvm_vgic_sync_hwstate(vcpu);

3
arch/arm64/include/asm/kvm_host.h
View File

@ -152,6 +152,9 @@ struct kvm_vcpu_arch {
/* vcpu power-off state */
bool power_off;
/* Don't run the guest (internal implementation need) */
bool pause;
/* IO related fields */
struct kvm_decode mmio_decode;