forked from luck/tmp_suning_uos_patched
KVM: arm/arm64: Enable adaptative WFE trapping
Trapping blocking WFE is extremely beneficial in situations where the system is oversubscribed, as it allows another thread to run while being blocked. In a non-oversubscribed environment, this is the complete opposite, and trapping WFE is just unnecessary overhead. Let's only enable WFE trapping if the CPU has more than a single task to run (that is, more than just the vcpu thread). Reviewed-by: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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@ -107,6 +107,16 @@ static inline unsigned long *vcpu_hcr(const struct kvm_vcpu *vcpu)
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return (unsigned long *)&vcpu->arch.hcr;
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}
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static inline void vcpu_clear_wfe_traps(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr &= ~HCR_TWE;
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}
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static inline void vcpu_set_wfe_traps(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr |= HCR_TWE;
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}
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static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
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{
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return 1;
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@ -83,6 +83,16 @@ static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu)
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return (unsigned long *)&vcpu->arch.hcr_el2;
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}
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static inline void vcpu_clear_wfe_traps(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr_el2 &= ~HCR_TWE;
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}
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static inline void vcpu_set_wfe_traps(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr_el2 |= HCR_TWE;
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}
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static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr)
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{
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vcpu->arch.vsesr_el2 = vsesr;
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@ -30,6 +30,7 @@
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#include <linux/kvm.h>
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#include <linux/kvm_irqfd.h>
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#include <linux/irqbypass.h>
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#include <linux/sched/stat.h>
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#include <trace/events/kvm.h>
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#include <kvm/arm_pmu.h>
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#include <kvm/arm_psci.h>
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@ -380,6 +381,11 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
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kvm_timer_vcpu_load(vcpu);
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kvm_vcpu_load_sysregs(vcpu);
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kvm_arch_vcpu_load_fp(vcpu);
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if (single_task_running())
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vcpu_clear_wfe_traps(vcpu);
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else
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vcpu_set_wfe_traps(vcpu);
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}
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void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
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