arch/powerpc/kvm/book3s_xive.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright 2017 Benjamin Herrenschmidt, IBM Corporation
  */

 #ifndef _KVM_PPC_BOOK3S_XIVE_H
 #define _KVM_PPC_BOOK3S_XIVE_H

 #ifdef CONFIG_KVM_XICS
 #include "book3s_xics.h"

 /*
  * The XIVE Interrupt source numbers are within the range 0 to
  * KVMPPC_XICS_NR_IRQS.
  */
 #define KVMPPC_XIVE_FIRST_IRQ	0
 #define KVMPPC_XIVE_NR_IRQS	KVMPPC_XICS_NR_IRQS

 /*
  * State for one guest irq source.
  *
  * For each guest source we allocate a HW interrupt in the XIVE
  * which we use for all SW triggers. It will be unused for
  * pass-through but it's easier to keep around as the same
  * guest interrupt can alternatively be emulated or pass-through
  * if a physical device is hot unplugged and replaced with an
  * emulated one.
  *
  * This state structure is very similar to the XICS one with
  * additional XIVE specific tracking.
  */
 struct kvmppc_xive_irq_state {
 	bool valid;			/* Interrupt entry is valid */

 	u32 number;			/* Guest IRQ number */
 	u32 ipi_number;			/* XIVE IPI HW number */
 	struct xive_irq_data ipi_data;	/* XIVE IPI associated data */
 	u32 pt_number;			/* XIVE Pass-through number if any */
 	struct xive_irq_data *pt_data;	/* XIVE Pass-through associated data */

 	/* Targetting as set by guest */
 	u8 guest_priority;		/* Guest set priority */
 	u8 saved_priority;		/* Saved priority when masking */

 	/* Actual targetting */
 	u32 act_server;			/* Actual server */
 	u8 act_priority;		/* Actual priority */

 	/* Various state bits */
 	bool in_eoi;			/* Synchronize with H_EOI */
 	bool old_p;			/* P bit state when masking */
 	bool old_q;			/* Q bit state when masking */
 	bool lsi;			/* level-sensitive interrupt */
 	bool asserted;			/* Only for emulated LSI: current state */

 	/* Saved for migration state */
 	bool in_queue;
 	bool saved_p;
 	bool saved_q;
 	u8 saved_scan_prio;

 	/* Xive native */
 	u32 eisn;			/* Guest Effective IRQ number */
 };

 /* Select the "right" interrupt (IPI vs. passthrough) */
 static inline void kvmppc_xive_select_irq(struct kvmppc_xive_irq_state *state,
 					  u32 *out_hw_irq,
 					  struct xive_irq_data **out_xd)
 {
 	if (state->pt_number) {
 		if (out_hw_irq)
 			*out_hw_irq = state->pt_number;
 		if (out_xd)
 			*out_xd = state->pt_data;
 	} else {
 		if (out_hw_irq)
 			*out_hw_irq = state->ipi_number;
 		if (out_xd)
 			*out_xd = &state->ipi_data;
 	}
 }

 /*
  * This corresponds to an "ICS" in XICS terminology, we use it
  * as a mean to break up source information into multiple structures.
  */
 struct kvmppc_xive_src_block {
 	arch_spinlock_t lock;
 	u16 id;
 	struct kvmppc_xive_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
 };

 struct kvmppc_xive;

 struct kvmppc_xive_ops {
 	int (*reset_mapped)(struct kvm *kvm, unsigned long guest_irq);
 };

 #define KVMPPC_XIVE_FLAG_SINGLE_ESCALATION 0x1
 #define KVMPPC_XIVE_FLAG_SAVE_RESTORE 0x2

 struct kvmppc_xive {
 	struct kvm *kvm;
 	struct kvm_device *dev;
 	struct dentry *dentry;

 	/* VP block associated with the VM */
 	u32	vp_base;

 	/* Blocks of sources */
 	struct kvmppc_xive_src_block *src_blocks[KVMPPC_XICS_MAX_ICS_ID + 1];
 	u32	max_sbid;

 	/*
 	 * For state save, we lazily scan the queues on the first interrupt
 	 * being migrated. We don't have a clean way to reset that flags
 	 * so we keep track of the number of valid sources and how many of
 	 * them were migrated so we can reset when all of them have been
 	 * processed.
 	 */
 	u32	src_count;
 	u32	saved_src_count;

 	/*
 	 * Some irqs are delayed on restore until the source is created,
 	 * keep track here of how many of them
 	 */
 	u32	delayed_irqs;

 	/* Which queues (priorities) are in use by the guest */
 	u8	qmap;

 	/* Queue orders */
 	u32	q_order;
 	u32	q_page_order;

 	/* Flags */
 	u8	flags;

 	/* Number of entries in the VP block */
 	u32	nr_servers;

 	struct kvmppc_xive_ops *ops;
 	struct address_space   *mapping;
 	struct mutex mapping_lock;
 	struct mutex lock;
 };

 #define KVMPPC_XIVE_Q_COUNT	8

 struct kvmppc_xive_vcpu {
 	struct kvmppc_xive	*xive;
 	struct kvm_vcpu		*vcpu;
 	bool			valid;

 	/* Server number. This is the HW CPU ID from a guest perspective */
 	u32			server_num;

 	/*
 	 * HW VP corresponding to this VCPU. This is the base of the VP
 	 * block plus the server number.
 	 */
 	u32			vp_id;
 	u32			vp_chip_id;
 	u32			vp_cam;

 	/* IPI used for sending ... IPIs */
 	u32			vp_ipi;
 	struct xive_irq_data	vp_ipi_data;

 	/* Local emulation state */
 	uint8_t			cppr;	/* guest CPPR */
 	uint8_t			hw_cppr;/* Hardware CPPR */
 	uint8_t			mfrr;
 	uint8_t			pending;

 	/* Each VP has 8 queues though we only provision some */
 	struct xive_q		queues[KVMPPC_XIVE_Q_COUNT];
 	u32			esc_virq[KVMPPC_XIVE_Q_COUNT];
 	char			*esc_virq_names[KVMPPC_XIVE_Q_COUNT];

 	/* Stash a delayed irq on restore from migration (see set_icp) */
 	u32			delayed_irq;

 	/* Stats */
 	u64			stat_rm_h_xirr;
 	u64			stat_rm_h_ipoll;
 	u64			stat_rm_h_cppr;
 	u64			stat_rm_h_eoi;
 	u64			stat_rm_h_ipi;
 	u64			stat_vm_h_xirr;
 	u64			stat_vm_h_ipoll;
 	u64			stat_vm_h_cppr;
 	u64			stat_vm_h_eoi;
 	u64			stat_vm_h_ipi;
 };

 static inline struct kvm_vcpu *kvmppc_xive_find_server(struct kvm *kvm, u32 nr)
 {
 	struct kvm_vcpu *vcpu = NULL;
 	unsigned long i;

 	kvm_for_each_vcpu(i, vcpu, kvm) {
 		if (vcpu->arch.xive_vcpu && nr == vcpu->arch.xive_vcpu->server_num)
 			return vcpu;
 	}
 	return NULL;
 }

 static inline struct kvmppc_xive_src_block *kvmppc_xive_find_source(struct kvmppc_xive *xive,
 		u32 irq, u16 *source)
 {
 	u32 bid = irq >> KVMPPC_XICS_ICS_SHIFT;
 	u16 src = irq & KVMPPC_XICS_SRC_MASK;

 	if (source)
 		*source = src;
 	if (bid > KVMPPC_XICS_MAX_ICS_ID)
 		return NULL;
 	return xive->src_blocks[bid];
 }

 /*
  * When the XIVE resources are allocated at the HW level, the VP
  * structures describing the vCPUs of a guest are distributed among
  * the chips to optimize the PowerBUS usage. For best performance, the
  * guest vCPUs can be pinned to match the VP structure distribution.
  *
  * Currently, the VP identifiers are deduced from the vCPU id using
  * the kvmppc_pack_vcpu_id() routine which is not incorrect but not
  * optimal either. It VSMT is used, the result is not continuous and
  * the constraints on HW resources described above can not be met.
  */
 static inline u32 kvmppc_xive_vp(struct kvmppc_xive *xive, u32 server)
 {
 	return xive->vp_base + kvmppc_pack_vcpu_id(xive->kvm, server);
 }

 static inline bool kvmppc_xive_vp_in_use(struct kvm *kvm, u32 vp_id)
 {
 	struct kvm_vcpu *vcpu = NULL;
 	unsigned long i;

 	kvm_for_each_vcpu(i, vcpu, kvm) {
 		if (vcpu->arch.xive_vcpu && vp_id == vcpu->arch.xive_vcpu->vp_id)
 			return true;
 	}
 	return false;
 }

 /*
  * Mapping between guest priorities and host priorities
  * is as follow.
  *
  * Guest request for 0...6 are honored. Guest request for anything
  * higher results in a priority of 6 being applied.
  *
  * Similar mapping is done for CPPR values
  */
 static inline u8 xive_prio_from_guest(u8 prio)
 {
 	if (prio == 0xff || prio < 6)
 		return prio;
 	return 6;
 }

 static inline u8 xive_prio_to_guest(u8 prio)
 {
 	return prio;
 }

 static inline u32 __xive_read_eq(__be32 *qpage, u32 msk, u32 *idx, u32 *toggle)
 {
 	u32 cur;

 	if (!qpage)
 		return 0;
 	cur = be32_to_cpup(qpage + *idx);
 	if ((cur >> 31) == *toggle)
 		return 0;
 	*idx = (*idx + 1) & msk;
 	if (*idx == 0)
 		(*toggle) ^= 1;
 	return cur & 0x7fffffff;
 }

 /*
  * Common Xive routines for XICS-over-XIVE and XIVE native
  */
 void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu);
 int kvmppc_xive_debug_show_queues(struct seq_file *m, struct kvm_vcpu *vcpu);
 void kvmppc_xive_debug_show_sources(struct seq_file *m,
 				    struct kvmppc_xive_src_block *sb);
 struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
 	struct kvmppc_xive *xive, int irq);
 void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb);
 int kvmppc_xive_select_target(struct kvm *kvm, u32 *server, u8 prio);
 int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio,
 				  bool single_escalation);
 struct kvmppc_xive *kvmppc_xive_get_device(struct kvm *kvm, u32 type);
 void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu,
 				    struct kvmppc_xive_vcpu *xc, int irq);
 int kvmppc_xive_compute_vp_id(struct kvmppc_xive *xive, u32 cpu, u32 *vp);
 int kvmppc_xive_set_nr_servers(struct kvmppc_xive *xive, u64 addr);
 bool kvmppc_xive_check_save_restore(struct kvm_vcpu *vcpu);

 static inline bool kvmppc_xive_has_single_escalation(struct kvmppc_xive *xive)
 {
 	return xive->flags & KVMPPC_XIVE_FLAG_SINGLE_ESCALATION;
 }

 #endif /* CONFIG_KVM_XICS */
 #endif /* _KVM_PPC_BOOK3S_XICS_H */
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* Copyright 2017 Benjamin Herrenschmidt, IBM Corporation
	*/

	#ifndef _KVM_PPC_BOOK3S_XIVE_H
	#define _KVM_PPC_BOOK3S_XIVE_H

	#ifdef CONFIG_KVM_XICS
	#include "book3s_xics.h"

	/*
	* The XIVE Interrupt source numbers are within the range 0 to
	* KVMPPC_XICS_NR_IRQS.
	*/
	#define KVMPPC_XIVE_FIRST_IRQ 0
	#define KVMPPC_XIVE_NR_IRQS KVMPPC_XICS_NR_IRQS

	/*
	* State for one guest irq source.
	*
	* For each guest source we allocate a HW interrupt in the XIVE
	* which we use for all SW triggers. It will be unused for
	* pass-through but it's easier to keep around as the same
	* guest interrupt can alternatively be emulated or pass-through
	* if a physical device is hot unplugged and replaced with an
	* emulated one.
	*
	* This state structure is very similar to the XICS one with
	* additional XIVE specific tracking.
	*/
	struct kvmppc_xive_irq_state {
	bool valid; /* Interrupt entry is valid */

	u32 number; /* Guest IRQ number */
	u32 ipi_number; /* XIVE IPI HW number */
	struct xive_irq_data ipi_data; /* XIVE IPI associated data */
	u32 pt_number; /* XIVE Pass-through number if any */
	struct xive_irq_data pt_data; / XIVE Pass-through associated data */

	/* Targetting as set by guest */
	u8 guest_priority; /* Guest set priority */
	u8 saved_priority; /* Saved priority when masking */

	/* Actual targetting */
	u32 act_server; /* Actual server */
	u8 act_priority; /* Actual priority */

	/* Various state bits */
	bool in_eoi; /* Synchronize with H_EOI */
	bool old_p; /* P bit state when masking */
	bool old_q; /* Q bit state when masking */
	bool lsi; /* level-sensitive interrupt */
	bool asserted; /* Only for emulated LSI: current state */

	/* Saved for migration state */
	bool in_queue;
	bool saved_p;
	bool saved_q;
	u8 saved_scan_prio;

	/* Xive native */
	u32 eisn; /* Guest Effective IRQ number */
	};

	/* Select the "right" interrupt (IPI vs. passthrough) */
	static inline void kvmppc_xive_select_irq(struct kvmppc_xive_irq_state *state,
	u32 *out_hw_irq,
	struct xive_irq_data **out_xd)
	{
	if (state->pt_number) {
	if (out_hw_irq)
	*out_hw_irq = state->pt_number;
	if (out_xd)
	*out_xd = state->pt_data;
	} else {
	if (out_hw_irq)
	*out_hw_irq = state->ipi_number;
	if (out_xd)
	*out_xd = &state->ipi_data;
	}
	}

	/*
	* This corresponds to an "ICS" in XICS terminology, we use it
	* as a mean to break up source information into multiple structures.
	*/
	struct kvmppc_xive_src_block {
	arch_spinlock_t lock;
	u16 id;
	struct kvmppc_xive_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
	};

	struct kvmppc_xive;

	struct kvmppc_xive_ops {
	int (reset_mapped)(struct kvm kvm, unsigned long guest_irq);
	};

	#define KVMPPC_XIVE_FLAG_SINGLE_ESCALATION 0x1
	#define KVMPPC_XIVE_FLAG_SAVE_RESTORE 0x2

	struct kvmppc_xive {
	struct kvm *kvm;
	struct kvm_device *dev;
	struct dentry *dentry;

	/* VP block associated with the VM */
	u32 vp_base;

	/* Blocks of sources */
	struct kvmppc_xive_src_block *src_blocks[KVMPPC_XICS_MAX_ICS_ID + 1];
	u32 max_sbid;

	/*
	* For state save, we lazily scan the queues on the first interrupt
	* being migrated. We don't have a clean way to reset that flags
	* so we keep track of the number of valid sources and how many of
	* them were migrated so we can reset when all of them have been
	* processed.
	*/
	u32 src_count;
	u32 saved_src_count;

	/*
	* Some irqs are delayed on restore until the source is created,
	* keep track here of how many of them
	*/
	u32 delayed_irqs;

	/* Which queues (priorities) are in use by the guest */
	u8 qmap;

	/* Queue orders */
	u32 q_order;
	u32 q_page_order;

	/* Flags */
	u8 flags;

	/* Number of entries in the VP block */
	u32 nr_servers;

	struct kvmppc_xive_ops *ops;
	struct address_space *mapping;
	struct mutex mapping_lock;
	struct mutex lock;
	};

	#define KVMPPC_XIVE_Q_COUNT 8

	struct kvmppc_xive_vcpu {
	struct kvmppc_xive *xive;
	struct kvm_vcpu *vcpu;
	bool valid;

	/* Server number. This is the HW CPU ID from a guest perspective */
	u32 server_num;

	/*
	* HW VP corresponding to this VCPU. This is the base of the VP
	* block plus the server number.
	*/
	u32 vp_id;
	u32 vp_chip_id;
	u32 vp_cam;

	/* IPI used for sending ... IPIs */
	u32 vp_ipi;
	struct xive_irq_data vp_ipi_data;

	/* Local emulation state */
	uint8_t cppr; /* guest CPPR */
	uint8_t hw_cppr;/* Hardware CPPR */
	uint8_t mfrr;
	uint8_t pending;

	/* Each VP has 8 queues though we only provision some */
	struct xive_q queues[KVMPPC_XIVE_Q_COUNT];
	u32 esc_virq[KVMPPC_XIVE_Q_COUNT];
	char *esc_virq_names[KVMPPC_XIVE_Q_COUNT];

	/* Stash a delayed irq on restore from migration (see set_icp) */
	u32 delayed_irq;

	/* Stats */
	u64 stat_rm_h_xirr;
	u64 stat_rm_h_ipoll;
	u64 stat_rm_h_cppr;
	u64 stat_rm_h_eoi;
	u64 stat_rm_h_ipi;
	u64 stat_vm_h_xirr;
	u64 stat_vm_h_ipoll;
	u64 stat_vm_h_cppr;
	u64 stat_vm_h_eoi;
	u64 stat_vm_h_ipi;
	};

	static inline struct kvm_vcpu kvmppc_xive_find_server(struct kvm kvm, u32 nr)
	{
	struct kvm_vcpu *vcpu = NULL;
	unsigned long i;

	kvm_for_each_vcpu(i, vcpu, kvm) {
	if (vcpu->arch.xive_vcpu && nr == vcpu->arch.xive_vcpu->server_num)
	return vcpu;
	}
	return NULL;
	}

	static inline struct kvmppc_xive_src_block kvmppc_xive_find_source(struct kvmppc_xive xive,
	u32 irq, u16 *source)
	{
	u32 bid = irq >> KVMPPC_XICS_ICS_SHIFT;
	u16 src = irq & KVMPPC_XICS_SRC_MASK;

	if (source)
	*source = src;
	if (bid > KVMPPC_XICS_MAX_ICS_ID)
	return NULL;
	return xive->src_blocks[bid];
	}

	/*
	* When the XIVE resources are allocated at the HW level, the VP
	* structures describing the vCPUs of a guest are distributed among
	* the chips to optimize the PowerBUS usage. For best performance, the
	* guest vCPUs can be pinned to match the VP structure distribution.
	*
	* Currently, the VP identifiers are deduced from the vCPU id using
	* the kvmppc_pack_vcpu_id() routine which is not incorrect but not
	* optimal either. It VSMT is used, the result is not continuous and
	* the constraints on HW resources described above can not be met.
	*/
	static inline u32 kvmppc_xive_vp(struct kvmppc_xive *xive, u32 server)
	{
	return xive->vp_base + kvmppc_pack_vcpu_id(xive->kvm, server);
	}

	static inline bool kvmppc_xive_vp_in_use(struct kvm *kvm, u32 vp_id)
	{
	struct kvm_vcpu *vcpu = NULL;
	unsigned long i;

	kvm_for_each_vcpu(i, vcpu, kvm) {
	if (vcpu->arch.xive_vcpu && vp_id == vcpu->arch.xive_vcpu->vp_id)
	return true;
	}
	return false;
	}

	/*
	* Mapping between guest priorities and host priorities
	* is as follow.
	*
	* Guest request for 0...6 are honored. Guest request for anything
	* higher results in a priority of 6 being applied.
	*
	* Similar mapping is done for CPPR values
	*/
	static inline u8 xive_prio_from_guest(u8 prio)
	{
	if (prio == 0xff \|\| prio < 6)
	return prio;
	return 6;
	}

	static inline u8 xive_prio_to_guest(u8 prio)
	{
	return prio;
	}

	static inline u32 __xive_read_eq(__be32 qpage, u32 msk, u32 idx, u32 *toggle)
	{
	u32 cur;

	if (!qpage)
	return 0;
	cur = be32_to_cpup(qpage + *idx);
	if ((cur >> 31) == *toggle)
	return 0;
	idx = (idx + 1) & msk;
	if (*idx == 0)
	(*toggle) ^= 1;
	return cur & 0x7fffffff;
	}

	/*
	* Common Xive routines for XICS-over-XIVE and XIVE native
	*/
	void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu);
	int kvmppc_xive_debug_show_queues(struct seq_file m, struct kvm_vcpu vcpu);
	void kvmppc_xive_debug_show_sources(struct seq_file *m,
	struct kvmppc_xive_src_block *sb);
	struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
	struct kvmppc_xive *xive, int irq);
	void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb);
	int kvmppc_xive_select_target(struct kvm kvm, u32 server, u8 prio);
	int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio,
	bool single_escalation);
	struct kvmppc_xive kvmppc_xive_get_device(struct kvm kvm, u32 type);
	void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu,
	struct kvmppc_xive_vcpu *xc, int irq);
	int kvmppc_xive_compute_vp_id(struct kvmppc_xive xive, u32 cpu, u32 vp);
	int kvmppc_xive_set_nr_servers(struct kvmppc_xive *xive, u64 addr);
	bool kvmppc_xive_check_save_restore(struct kvm_vcpu *vcpu);

	static inline bool kvmppc_xive_has_single_escalation(struct kvmppc_xive *xive)
	{
	return xive->flags & KVMPPC_XIVE_FLAG_SINGLE_ESCALATION;
	}

	#endif /* CONFIG_KVM_XICS */
	#endif /* _KVM_PPC_BOOK3S_XICS_H */