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KVM: arm64: Track vCPU power state using MP state values

Browse source 
A subsequent change to KVM will add support for additional power states.
Store the MP state by value rather than keeping track of it as a
boolean.

No functional change intended.

Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220504032446.4133305-4-oupton@google.com
This commit is contained in:
Oliver Upton 2022-05-04 03:24:37 +00:00 committed by Marc Zyngier
parent 1e5794295c
commit b171f9bbb1
3 changed files with 21 additions and 18 deletions
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5
arch/arm64/include/asm/kvm_host.h
View file

@ -365,8 +365,8 @@ struct kvm_vcpu_arch {
u32 mdscr_el1;
} guest_debug_preserved;
/* vcpu power-off state */
bool power_off;
/* vcpu power state */
struct kvm_mp_state mp_state;
/* Don't run the guest (internal implementation need) */
bool pause;
@ -842,5 +842,6 @@ static inline void kvm_hyp_reserve(void) { }
#endif
void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu);
bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu);
#endif /* __ARM64_KVM_HOST_H__ */

22
arch/arm64/kvm/arm.c
View file

@ -434,18 +434,20 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
{
vcpu->arch.power_off = true;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_STOPPED;
kvm_make_request(KVM_REQ_SLEEP, vcpu);
kvm_vcpu_kick(vcpu);
}
bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu)
{
return vcpu->arch.mp_state.mp_state == KVM_MP_STATE_STOPPED;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
if (vcpu->arch.power_off)
mp_state->mp_state = KVM_MP_STATE_STOPPED;
else
mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
*mp_state = vcpu->arch.mp_state;
return 0;
}
@ -457,7 +459,7 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
switch (mp_state->mp_state) {
case KVM_MP_STATE_RUNNABLE:
vcpu->arch.power_off = false;
vcpu->arch.mp_state = *mp_state;
break;
case KVM_MP_STATE_STOPPED:
kvm_arm_vcpu_power_off(vcpu);
@ -480,7 +482,7 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
&& !v->arch.power_off && !v->arch.pause);
&& !kvm_arm_vcpu_stopped(v) && !v->arch.pause);
}
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
@ -597,10 +599,10 @@ static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
rcuwait_wait_event(wait,
(!vcpu->arch.power_off) &&(!vcpu->arch.pause),
(!kvm_arm_vcpu_stopped(vcpu)) && (!vcpu->arch.pause),
TASK_INTERRUPTIBLE);
if (vcpu->arch.power_off || vcpu->arch.pause) {
if (kvm_arm_vcpu_stopped(vcpu) || vcpu->arch.pause) {
/* Awaken to handle a signal, request we sleep again later. */
kvm_make_request(KVM_REQ_SLEEP, vcpu);
}
@ -1126,7 +1128,7 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
kvm_arm_vcpu_power_off(vcpu);
else
vcpu->arch.power_off = false;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
return 0;
}

12
arch/arm64/kvm/psci.c
View file

@ -76,7 +76,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
*/
if (!vcpu)
return PSCI_RET_INVALID_PARAMS;
if (!vcpu->arch.power_off) {
if (!kvm_arm_vcpu_stopped(vcpu)) {
if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1)
return PSCI_RET_ALREADY_ON;
else
@ -100,12 +100,12 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
/*
* Make sure the reset request is observed if the change to
* power_off is observed.
* Make sure the reset request is observed if the RUNNABLE mp_state is
* observed.
*/
smp_wmb();
vcpu->arch.power_off = false;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
kvm_vcpu_wake_up(vcpu);
return PSCI_RET_SUCCESS;
@ -143,7 +143,7 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
mpidr = kvm_vcpu_get_mpidr_aff(tmp);
if ((mpidr & target_affinity_mask) == target_affinity) {
matching_cpus++;
if (!tmp->arch.power_off)
if (!kvm_arm_vcpu_stopped(tmp))
return PSCI_0_2_AFFINITY_LEVEL_ON;
}
}
@ -169,7 +169,7 @@ static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type, u64 flags)
* re-initialized.
*/
kvm_for_each_vcpu(i, tmp, vcpu->kvm)
tmp->arch.power_off = true;
tmp->arch.mp_state.mp_state = KVM_MP_STATE_STOPPED;
kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));