cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

lppaca.h (4745B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * lppaca.h
      4 * Copyright (C) 2001  Mike Corrigan IBM Corporation
      5 */
      6#ifndef _ASM_POWERPC_LPPACA_H
      7#define _ASM_POWERPC_LPPACA_H
      8
      9/*
     10 * The below VPHN macros are outside the __KERNEL__ check since these are
     11 * used for compiling the vphn selftest in userspace
     12 */
     13
     14/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
     15#define VPHN_REGISTER_COUNT 6
     16
     17/*
     18 * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
     19 * form the complete property we have to add the length in the first cell.
     20 */
     21#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)
     22
     23/*
     24 * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
     25 * 1 for retrieving associativity information for a guest cpu
     26 * 2 for retrieving associativity information for a host/hypervisor cpu
     27 */
     28#define VPHN_FLAG_VCPU	1
     29#define VPHN_FLAG_PCPU	2
     30
     31#ifdef __KERNEL__
     32
     33/*
     34 * These definitions relate to hypervisors that only exist when using
     35 * a server type processor
     36 */
     37#ifdef CONFIG_PPC_BOOK3S
     38
     39/*
     40 * This control block contains the data that is shared between the
     41 * hypervisor and the OS.
     42 */
     43#include <linux/cache.h>
     44#include <linux/threads.h>
     45#include <asm/types.h>
     46#include <asm/mmu.h>
     47#include <asm/firmware.h>
     48
     49/*
     50 * The lppaca is the "virtual processor area" registered with the hypervisor,
     51 * H_REGISTER_VPA etc.
     52 *
     53 * According to PAPR, the structure is 640 bytes long, must be L1 cache line
     54 * aligned, and must not cross a 4kB boundary. Its size field must be at
     55 * least 640 bytes (but may be more).
     56 *
     57 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
     58 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
     59 * this structure as the canonical 640 byte size.
     60 */
     61struct lppaca {
     62	/* cacheline 1 contains read-only data */
     63
     64	__be32	desc;			/* Eye catcher 0xD397D781 */
     65	__be16	size;			/* Size of this struct */
     66	u8	reserved1[3];
     67	u8	__old_status;		/* Old status, including shared proc */
     68	u8	reserved3[14];
     69	volatile __be32 dyn_hw_node_id;	/* Dynamic hardware node id */
     70	volatile __be32 dyn_hw_proc_id;	/* Dynamic hardware proc id */
     71	u8	reserved4[56];
     72	volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
     73					  /* associativity change counters */
     74	u8	reserved5[32];
     75
     76	/* cacheline 2 contains local read-write data */
     77
     78	u8	reserved6[48];
     79	u8	cede_latency_hint;
     80	u8	ebb_regs_in_use;
     81	u8	reserved7[6];
     82	u8	dtl_enable_mask;	/* Dispatch Trace Log mask */
     83	u8	donate_dedicated_cpu;	/* Donate dedicated CPU cycles */
     84	u8	fpregs_in_use;
     85	u8	pmcregs_in_use;
     86	u8	reserved8[28];
     87	__be64	wait_state_cycles;	/* Wait cycles for this proc */
     88	u8	reserved9[28];
     89	__be16	slb_count;		/* # of SLBs to maintain */
     90	u8	idle;			/* Indicate OS is idle */
     91	u8	vmxregs_in_use;
     92
     93	/* cacheline 3 is shared with other processors */
     94
     95	/*
     96	 * This is the yield_count.  An "odd" value (low bit on) means that
     97	 * the processor is yielded (either because of an OS yield or a
     98	 * hypervisor preempt).  An even value implies that the processor is
     99	 * currently executing.
    100	 * NOTE: Even dedicated processor partitions can yield so this
    101	 * field cannot be used to determine if we are shared or dedicated.
    102	 */
    103	volatile __be32 yield_count;
    104	volatile __be32 dispersion_count; /* dispatch changed physical cpu */
    105	volatile __be64 cmo_faults;	/* CMO page fault count */
    106	volatile __be64 cmo_fault_time;	/* CMO page fault time */
    107	u8	reserved10[104];
    108
    109	/* cacheline 4-5 */
    110
    111	__be32	page_ins;		/* CMO Hint - # page ins by OS */
    112	u8	reserved11[148];
    113	volatile __be64 dtl_idx;	/* Dispatch Trace Log head index */
    114	u8	reserved12[96];
    115} ____cacheline_aligned;
    116
    117#define lppaca_of(cpu)	(*paca_ptrs[cpu]->lppaca_ptr)
    118
    119/*
    120 * We are using a non architected field to determine if a partition is
    121 * shared or dedicated. This currently works on both KVM and PHYP, but
    122 * we will have to transition to something better.
    123 */
    124#define LPPACA_OLD_SHARED_PROC		2
    125
    126static inline bool lppaca_shared_proc(struct lppaca *l)
    127{
    128	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
    129		return false;
    130	return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
    131}
    132
    133/*
    134 * SLB shadow buffer structure as defined in the PAPR.  The save_area
    135 * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
    136 * ESID is stored in the lower 64bits, then the VSID.
    137 */
    138struct slb_shadow {
    139	__be32	persistent;		/* Number of persistent SLBs */
    140	__be32	buffer_length;		/* Total shadow buffer length */
    141	__be64	reserved;
    142	struct	{
    143		__be64     esid;
    144		__be64	vsid;
    145	} save_area[SLB_NUM_BOLTED];
    146} ____cacheline_aligned;
    147
    148extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
    149
    150#endif /* CONFIG_PPC_BOOK3S */
    151#endif /* __KERNEL__ */
    152#endif /* _ASM_POWERPC_LPPACA_H */