From: Radim Krčmář Date: Tue, 30 Jun 2015 20:19:16 +0000 (+0200) Subject: KVM: x86: keep track of LVT0 changes under APICv X-Git-Tag: firefly_0821_release~176^2~1463^2~3 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=59fd132340b3e37b83179d2fcb673980035edf62;p=firefly-linux-kernel-4.4.55.git KVM: x86: keep track of LVT0 changes under APICv Memory-mapped LVT0 register already contains the new value when APICv traps so we can't directly detect a change. Memorize a bit we are interested in to enable legacy NMI watchdog. Suggested-by: Yoshida Nobuo Signed-off-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index e0f721bfabcb..954e98a8c2e3 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1257,16 +1257,17 @@ static void start_apic_timer(struct kvm_lapic *apic) static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val) { - int nmi_wd_enabled = apic_lvt_nmi_mode(kvm_apic_get_reg(apic, APIC_LVT0)); + bool lvt0_in_nmi_mode = apic_lvt_nmi_mode(lvt0_val); - if (apic_lvt_nmi_mode(lvt0_val)) { - if (!nmi_wd_enabled) { + if (apic->lvt0_in_nmi_mode != lvt0_in_nmi_mode) { + apic->lvt0_in_nmi_mode = lvt0_in_nmi_mode; + if (lvt0_in_nmi_mode) { apic_debug("Receive NMI setting on APIC_LVT0 " "for cpu %d\n", apic->vcpu->vcpu_id); atomic_inc(&apic->vcpu->kvm->arch.vapics_in_nmi_mode); - } - } else if (nmi_wd_enabled) - atomic_dec(&apic->vcpu->kvm->arch.vapics_in_nmi_mode); + } else + atomic_dec(&apic->vcpu->kvm->arch.vapics_in_nmi_mode); + } } static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) @@ -1597,6 +1598,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event) if (!(vcpu->kvm->arch.disabled_quirks & KVM_QUIRK_LINT0_REENABLED)) apic_set_reg(apic, APIC_LVT0, SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT)); + apic_manage_nmi_watchdog(apic, kvm_apic_get_reg(apic, APIC_LVT0)); apic_set_reg(apic, APIC_DFR, 0xffffffffU); apic_set_spiv(apic, 0xff); diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index f2f4e10ab772..71952748222a 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -26,6 +26,7 @@ struct kvm_lapic { struct kvm_vcpu *vcpu; bool sw_enabled; bool irr_pending; + bool lvt0_in_nmi_mode; /* Number of bits set in ISR. */ s16 isr_count; /* The highest vector set in ISR; if -1 - invalid, must scan ISR. */