cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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book3s_xics.h (3723B)


      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright 2012 Michael Ellerman, IBM Corporation.
      4 * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation
      5 */
      6
      7#ifndef _KVM_PPC_BOOK3S_XICS_H
      8#define _KVM_PPC_BOOK3S_XICS_H
      9
     10#ifdef CONFIG_KVM_XICS
     11/*
     12 * We use a two-level tree to store interrupt source information.
     13 * There are up to 1024 ICS nodes, each of which can represent
     14 * 1024 sources.
     15 */
     16#define KVMPPC_XICS_MAX_ICS_ID	1023
     17#define KVMPPC_XICS_ICS_SHIFT	10
     18#define KVMPPC_XICS_IRQ_PER_ICS	(1 << KVMPPC_XICS_ICS_SHIFT)
     19#define KVMPPC_XICS_SRC_MASK	(KVMPPC_XICS_IRQ_PER_ICS - 1)
     20
     21/*
     22 * Interrupt source numbers below this are reserved, for example
     23 * 0 is "no interrupt", and 2 is used for IPIs.
     24 */
     25#define KVMPPC_XICS_FIRST_IRQ	16
     26#define KVMPPC_XICS_NR_IRQS	((KVMPPC_XICS_MAX_ICS_ID + 1) * \
     27				 KVMPPC_XICS_IRQ_PER_ICS)
     28
     29/* Priority value to use for disabling an interrupt */
     30#define MASKED	0xff
     31
     32#define PQ_PRESENTED	1
     33#define PQ_QUEUED	2
     34
     35/* State for one irq source */
     36struct ics_irq_state {
     37	u32 number;
     38	u32 server;
     39	u32 pq_state;
     40	u8  priority;
     41	u8  saved_priority;
     42	u8  resend;
     43	u8  masked_pending;
     44	u8  lsi;		/* level-sensitive interrupt */
     45	u8  exists;
     46	int intr_cpu;
     47	u32 host_irq;
     48};
     49
     50/* Atomic ICP state, updated with a single compare & swap */
     51union kvmppc_icp_state {
     52	unsigned long raw;
     53	struct {
     54		u8 out_ee:1;
     55		u8 need_resend:1;
     56		u8 cppr;
     57		u8 mfrr;
     58		u8 pending_pri;
     59		u32 xisr;
     60	};
     61};
     62
     63/* One bit per ICS */
     64#define ICP_RESEND_MAP_SIZE	(KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
     65
     66struct kvmppc_icp {
     67	struct kvm_vcpu *vcpu;
     68	unsigned long server_num;
     69	union kvmppc_icp_state state;
     70	unsigned long resend_map[ICP_RESEND_MAP_SIZE];
     71
     72	/* Real mode might find something too hard, here's the action
     73	 * it might request from virtual mode
     74	 */
     75#define XICS_RM_KICK_VCPU	0x1
     76#define XICS_RM_CHECK_RESEND	0x2
     77#define XICS_RM_NOTIFY_EOI	0x8
     78	u32 rm_action;
     79	struct kvm_vcpu *rm_kick_target;
     80	struct kvmppc_icp *rm_resend_icp;
     81	u32  rm_reject;
     82	u32  rm_eoied_irq;
     83
     84	/* Counters for each reason we exited real mode */
     85	unsigned long n_rm_kick_vcpu;
     86	unsigned long n_rm_check_resend;
     87	unsigned long n_rm_notify_eoi;
     88	/* Counters for handling ICP processing in real mode */
     89	unsigned long n_check_resend;
     90	unsigned long n_reject;
     91
     92	/* Debug stuff for real mode */
     93	union kvmppc_icp_state rm_dbgstate;
     94	struct kvm_vcpu *rm_dbgtgt;
     95};
     96
     97struct kvmppc_ics {
     98	arch_spinlock_t lock;
     99	u16 icsid;
    100	struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
    101};
    102
    103struct kvmppc_xics {
    104	struct kvm *kvm;
    105	struct kvm_device *dev;
    106	struct dentry *dentry;
    107	u32 max_icsid;
    108	bool real_mode;
    109	bool real_mode_dbg;
    110	u32 err_noics;
    111	u32 err_noicp;
    112	struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
    113};
    114
    115static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
    116							 u32 nr)
    117{
    118	struct kvm_vcpu *vcpu = NULL;
    119	unsigned long i;
    120
    121	kvm_for_each_vcpu(i, vcpu, kvm) {
    122		if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
    123			return vcpu->arch.icp;
    124	}
    125	return NULL;
    126}
    127
    128static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
    129						      u32 irq, u16 *source)
    130{
    131	u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
    132	u16 src = irq & KVMPPC_XICS_SRC_MASK;
    133	struct kvmppc_ics *ics;
    134
    135	if (source)
    136		*source = src;
    137	if (icsid > KVMPPC_XICS_MAX_ICS_ID)
    138		return NULL;
    139	ics = xics->ics[icsid];
    140	if (!ics)
    141		return NULL;
    142	return ics;
    143}
    144
    145extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu);
    146extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
    147			 unsigned long mfrr);
    148extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr);
    149extern int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr);
    150
    151#endif /* CONFIG_KVM_XICS */
    152#endif /* _KVM_PPC_BOOK3S_XICS_H */