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 <[email protected]> --- v1 -> v2: - check pause in kvm_arch_vcpu_runnable - we cannot use kvm_vcpu_block since this latter would exit on IRQ/FIQ and this is not what we want --- arch/arm/include/asm/kvm_host.h | 3 +++ arch/arm/kvm/arm.c | 35 +++++++++++++++++++++++++++++++---- arch/arm64/include/asm/kvm_host.h | 3 +++ 3 files changed, 37 insertions(+), 4 deletions(-) diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 304004d..dac85f6 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -132,6 +132,9 @@ struct kvm_vcpu_arch { /* vcpu power-off state */ bool power_off; + /* Exit and don't run the guest (internal implementation need) */ + bool pause; + /* IO related fields */ struct kvm_decode mmio_decode; diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index cc404a8..0529b38 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -348,7 +348,7 @@ 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 */ @@ -474,11 +474,38 @@ 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) @@ -528,7 +555,7 @@ 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); /* @@ -556,7 +583,7 @@ 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_vgic_sync_hwstate(vcpu); preempt_enable(); diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 009da6b..69e3785 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -125,6 +125,9 @@ struct kvm_vcpu_arch { /* vcpu power-off state */ bool power_off; + /* Don't run the guest */ + bool pause; + /* IO related fields */ struct kvm_decode mmio_decode; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
