1 files changed, 266 insertions, 0 deletions

diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
new file mode 100644
index 000000000..4fb86e3a9
--- /dev/null
+++ b/arch/x86/kvm/lapic.h
@@ -0,0 +1,266 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __KVM_X86_LAPIC_H
+#define __KVM_X86_LAPIC_H
+
+#include <kvm/iodev.h>
+
+#include <linux/kvm_host.h>
+
+#define KVM_APIC_INIT		0
+#define KVM_APIC_SIPI		1
+#define KVM_APIC_LVT_NUM	6
+
+#define APIC_SHORT_MASK			0xc0000
+#define APIC_DEST_NOSHORT		0x0
+#define APIC_DEST_MASK			0x800
+
+#define APIC_BUS_CYCLE_NS       1
+#define APIC_BUS_FREQUENCY      (1000000000ULL / APIC_BUS_CYCLE_NS)
+
+#define APIC_BROADCAST			0xFF
+#define X2APIC_BROADCAST		0xFFFFFFFFul
+
+enum lapic_mode {
+	LAPIC_MODE_DISABLED = 0,
+	LAPIC_MODE_INVALID = X2APIC_ENABLE,
+	LAPIC_MODE_XAPIC = MSR_IA32_APICBASE_ENABLE,
+	LAPIC_MODE_X2APIC = MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE,
+};
+
+struct kvm_timer {
+	struct hrtimer timer;
+	s64 period; 				/* unit: ns */
+	ktime_t target_expiration;
+	u32 timer_mode;
+	u32 timer_mode_mask;
+	u64 tscdeadline;
+	u64 expired_tscdeadline;
+	u32 timer_advance_ns;
+	s64 advance_expire_delta;
+	atomic_t pending;			/* accumulated triggered timers */
+	bool hv_timer_in_use;
+};
+
+struct kvm_lapic {
+	unsigned long base_address;
+	struct kvm_io_device dev;
+	struct kvm_timer lapic_timer;
+	u32 divide_count;
+	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. */
+	int highest_isr_cache;
+	/**
+	 * APIC register page.  The layout matches the register layout seen by
+	 * the guest 1:1, because it is accessed by the vmx microcode.
+	 * Note: Only one register, the TPR, is used by the microcode.
+	 */
+	void *regs;
+	gpa_t vapic_addr;
+	struct gfn_to_hva_cache vapic_cache;
+	unsigned long pending_events;
+	unsigned int sipi_vector;
+};
+
+struct dest_map;
+
+int kvm_create_lapic(struct kvm_vcpu *vcpu, int timer_advance_ns);
+void kvm_free_lapic(struct kvm_vcpu *vcpu);
+
+int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu);
+int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu);
+int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu);
+void kvm_apic_accept_events(struct kvm_vcpu *vcpu);
+void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event);
+u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu);
+void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8);
+void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu);
+void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value);
+u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu);
+void kvm_recalculate_apic_map(struct kvm *kvm);
+void kvm_apic_set_version(struct kvm_vcpu *vcpu);
+int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val);
+int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
+		       void *data);
+bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
+			   int shorthand, unsigned int dest, int dest_mode);
+int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
+void kvm_apic_clear_irr(struct kvm_vcpu *vcpu, int vec);
+bool __kvm_apic_update_irr(u32 *pir, void *regs, int *max_irr);
+bool kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir, int *max_irr);
+void kvm_apic_update_ppr(struct kvm_vcpu *vcpu);
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
+		     struct dest_map *dest_map);
+int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type);
+void kvm_apic_update_apicv(struct kvm_vcpu *vcpu);
+
+bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
+		struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map);
+void kvm_apic_send_ipi(struct kvm_lapic *apic, u32 icr_low, u32 icr_high);
+
+u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
+int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
+int kvm_apic_get_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s);
+int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s);
+enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu);
+int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu);
+
+u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu);
+void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data);
+
+void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset);
+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector);
+
+int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);
+void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu);
+void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu);
+
+int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
+int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
+
+int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
+int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
+
+static inline bool kvm_hv_vapic_assist_page_enabled(struct kvm_vcpu *vcpu)
+{
+	return vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;
+}
+
+int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data, unsigned long len);
+void kvm_lapic_init(void);
+void kvm_lapic_exit(void);
+
+#define VEC_POS(v) ((v) & (32 - 1))
+#define REG_POS(v) (((v) >> 5) << 4)
+
+static inline void kvm_lapic_clear_vector(int vec, void *bitmap)
+{
+	clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
+}
+
+static inline void kvm_lapic_set_vector(int vec, void *bitmap)
+{
+	set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
+}
+
+static inline void kvm_lapic_set_irr(int vec, struct kvm_lapic *apic)
+{
+	kvm_lapic_set_vector(vec, apic->regs + APIC_IRR);
+	/*
+	 * irr_pending must be true if any interrupt is pending; set it after
+	 * APIC_IRR to avoid race with apic_clear_irr
+	 */
+	apic->irr_pending = true;
+}
+
+static inline u32 kvm_lapic_get_reg(struct kvm_lapic *apic, int reg_off)
+{
+	return *((u32 *) (apic->regs + reg_off));
+}
+
+static inline void __kvm_lapic_set_reg(char *regs, int reg_off, u32 val)
+{
+	*((u32 *) (regs + reg_off)) = val;
+}
+
+static inline void kvm_lapic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
+{
+	__kvm_lapic_set_reg(apic->regs, reg_off, val);
+}
+
+extern struct static_key kvm_no_apic_vcpu;
+
+static inline bool lapic_in_kernel(struct kvm_vcpu *vcpu)
+{
+	if (static_key_false(&kvm_no_apic_vcpu))
+		return vcpu->arch.apic;
+	return true;
+}
+
+extern struct static_key_deferred apic_hw_disabled;
+
+static inline int kvm_apic_hw_enabled(struct kvm_lapic *apic)
+{
+	if (static_key_false(&apic_hw_disabled.key))
+		return apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
+	return MSR_IA32_APICBASE_ENABLE;
+}
+
+extern struct static_key_deferred apic_sw_disabled;
+
+static inline bool kvm_apic_sw_enabled(struct kvm_lapic *apic)
+{
+	if (static_key_false(&apic_sw_disabled.key))
+		return apic->sw_enabled;
+	return true;
+}
+
+static inline bool kvm_apic_present(struct kvm_vcpu *vcpu)
+{
+	return lapic_in_kernel(vcpu) && kvm_apic_hw_enabled(vcpu->arch.apic);
+}
+
+static inline int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
+{
+	return kvm_apic_present(vcpu) && kvm_apic_sw_enabled(vcpu->arch.apic);
+}
+
+static inline int apic_x2apic_mode(struct kvm_lapic *apic)
+{
+	return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
+}
+
+static inline bool kvm_vcpu_apicv_active(struct kvm_vcpu *vcpu)
+{
+	return vcpu->arch.apic && vcpu->arch.apicv_active;
+}
+
+static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
+{
+	return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events;
+}
+
+static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq)
+{
+	return (irq->delivery_mode == APIC_DM_LOWEST ||
+			irq->msi_redir_hint);
+}
+
+static inline int kvm_lapic_latched_init(struct kvm_vcpu *vcpu)
+{
+	return lapic_in_kernel(vcpu) && test_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
+}
+
+bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
+
+void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu);
+
+void kvm_bitmap_or_dest_vcpus(struct kvm *kvm, struct kvm_lapic_irq *irq,
+			      unsigned long *vcpu_bitmap);
+
+bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
+			struct kvm_vcpu **dest_vcpu);
+int kvm_vector_to_index(u32 vector, u32 dest_vcpus,
+			const unsigned long *bitmap, u32 bitmap_size);
+void kvm_lapic_switch_to_sw_timer(struct kvm_vcpu *vcpu);
+void kvm_lapic_switch_to_hv_timer(struct kvm_vcpu *vcpu);
+void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu);
+bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu *vcpu);
+void kvm_lapic_restart_hv_timer(struct kvm_vcpu *vcpu);
+bool kvm_can_use_hv_timer(struct kvm_vcpu *vcpu);
+
+static inline enum lapic_mode kvm_apic_mode(u64 apic_base)
+{
+	return apic_base & (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE);
+}
+
+static inline u8 kvm_xapic_id(struct kvm_lapic *apic)
+{
+	return kvm_lapic_get_reg(apic, APIC_ID) >> 24;
+}
+
+#endif