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SynIC (synthetic interrupt controller) is a lapic extension, which is controlled via MSRs and maintains for each vCPU - 16 synthetic interrupt "lines" (SINT's); each can be configured to trigger a specific interrupt vector optionally with auto-EOI semantics - a message page in the guest memory with 16 256-byte per-SINT message slots - an event flag page in the guest memory with 16 2048-bit per-SINT event flag areas The host triggers a SINT whenever it delivers a new message to the corresponding slot or flips an event flag bit in the corresponding area. The guest informs the host that it can try delivering a message by explicitly asserting EOI in lapic or writing to End-Of-Message (EOM) MSR. The userspace (qemu) triggers interrupts and receives EOM notifications via irqfd with resampler; for that, a GSI is allocated for each configured SINT, and irq_routing api is extended to support GSI-SINT mapping. Changes v4: * added activation of SynIC by vcpu KVM_ENABLE_CAP * added per SynIC active flag * added deactivation of APICv upon SynIC activation Changes v3: * added KVM_CAP_HYPERV_SYNIC and KVM_IRQ_ROUTING_HV_SINT notes into docs Changes v2: * do not use posted interrupts for Hyper-V SynIC AutoEOI vectors * add Hyper-V SynIC vectors into EOI exit bitmap * Hyper-V SyniIC SINT msr write logic simplified Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com> Reviewed-by: Roman Kagan <rkagan@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Gleb Natapov <gleb@kernel.org> CC: Paolo Bonzini <pbonzini@redhat.com> CC: Roman Kagan <rkagan@virtuozzo.com> CC: Denis V. Lunev <den@openvz.org> CC: qemu-devel@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
178 lines
5.4 KiB
C
178 lines
5.4 KiB
C
#ifndef __KVM_X86_LAPIC_H
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#define __KVM_X86_LAPIC_H
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#include <kvm/iodev.h>
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#include <linux/kvm_host.h>
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#define KVM_APIC_INIT 0
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#define KVM_APIC_SIPI 1
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struct kvm_timer {
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struct hrtimer timer;
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s64 period; /* unit: ns */
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u32 timer_mode;
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u32 timer_mode_mask;
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u64 tscdeadline;
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u64 expired_tscdeadline;
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atomic_t pending; /* accumulated triggered timers */
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};
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struct kvm_lapic {
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unsigned long base_address;
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struct kvm_io_device dev;
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struct kvm_timer lapic_timer;
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u32 divide_count;
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struct kvm_vcpu *vcpu;
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bool sw_enabled;
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bool irr_pending;
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bool lvt0_in_nmi_mode;
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/* Number of bits set in ISR. */
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s16 isr_count;
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/* The highest vector set in ISR; if -1 - invalid, must scan ISR. */
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int highest_isr_cache;
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/**
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* APIC register page. The layout matches the register layout seen by
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* the guest 1:1, because it is accessed by the vmx microcode.
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* Note: Only one register, the TPR, is used by the microcode.
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*/
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void *regs;
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gpa_t vapic_addr;
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struct gfn_to_hva_cache vapic_cache;
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unsigned long pending_events;
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unsigned int sipi_vector;
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};
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int kvm_create_lapic(struct kvm_vcpu *vcpu);
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void kvm_free_lapic(struct kvm_vcpu *vcpu);
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int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu);
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int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu);
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int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu);
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void kvm_apic_accept_events(struct kvm_vcpu *vcpu);
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void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event);
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u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu);
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void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8);
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void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu);
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void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value);
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u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu);
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void kvm_apic_set_version(struct kvm_vcpu *vcpu);
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void __kvm_apic_update_irr(u32 *pir, void *regs);
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void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir);
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int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
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unsigned long *dest_map);
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int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type);
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bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
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struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map);
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u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
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int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
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void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
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struct kvm_lapic_state *s);
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int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu);
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u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu);
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void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data);
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void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset);
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void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector);
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int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);
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void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu);
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void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu);
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int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
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int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
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int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
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int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
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static inline bool kvm_hv_vapic_assist_page_enabled(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE;
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}
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int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data);
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void kvm_lapic_init(void);
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static inline u32 kvm_apic_get_reg(struct kvm_lapic *apic, int reg_off)
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{
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return *((u32 *) (apic->regs + reg_off));
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}
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extern struct static_key kvm_no_apic_vcpu;
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static inline bool kvm_vcpu_has_lapic(struct kvm_vcpu *vcpu)
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{
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if (static_key_false(&kvm_no_apic_vcpu))
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return vcpu->arch.apic;
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return true;
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}
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extern struct static_key_deferred apic_hw_disabled;
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static inline int kvm_apic_hw_enabled(struct kvm_lapic *apic)
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{
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if (static_key_false(&apic_hw_disabled.key))
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return apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
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return MSR_IA32_APICBASE_ENABLE;
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}
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extern struct static_key_deferred apic_sw_disabled;
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static inline bool kvm_apic_sw_enabled(struct kvm_lapic *apic)
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{
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if (static_key_false(&apic_sw_disabled.key))
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return apic->sw_enabled;
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return true;
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}
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static inline bool kvm_apic_present(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_has_lapic(vcpu) && kvm_apic_hw_enabled(vcpu->arch.apic);
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}
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static inline int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
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{
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return kvm_apic_present(vcpu) && kvm_apic_sw_enabled(vcpu->arch.apic);
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}
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static inline int apic_x2apic_mode(struct kvm_lapic *apic)
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{
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return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
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}
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static inline bool kvm_vcpu_apicv_active(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.apic && vcpu->arch.apicv_active;
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}
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static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_has_lapic(vcpu) && vcpu->arch.apic->pending_events;
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}
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static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq)
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{
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return (irq->delivery_mode == APIC_DM_LOWEST ||
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irq->msi_redir_hint);
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}
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static inline int kvm_lapic_latched_init(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_has_lapic(vcpu) && test_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
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}
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static inline int kvm_apic_id(struct kvm_lapic *apic)
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{
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return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
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}
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bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
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void wait_lapic_expire(struct kvm_vcpu *vcpu);
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bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
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struct kvm_vcpu **dest_vcpu);
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#endif
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