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/*
* Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Yu Liu, <yu.liu@freescale.com>
*
* Description:
* This file is derived from arch/powerpc/kvm/44x.c,
* by Hollis Blanchard <hollisb@us.ibm.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*/
#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include "../mm/mmu_decl.h"
#include "booke.h"
#include "e500.h"
struct id {
unsigned long val;
struct id **pentry;
};
#define NUM_TIDS 256
/*
* This table provide mappings from:
* (guestAS,guestTID,guestPR) --> ID of physical cpu
* guestAS [0..1]
* guestTID [0..255]
* guestPR [0..1]
* ID [1..255]
* Each vcpu keeps one vcpu_id_table.
*/
struct vcpu_id_table {
struct id id[2][NUM_TIDS][2];
};
/*
* This table provide reversed mappings of vcpu_id_table:
* ID --> address of vcpu_id_table item.
* Each physical core has one pcpu_id_table.
*/
struct pcpu_id_table {
struct id *entry[NUM_TIDS];
};
static DEFINE_PER_CPU(struct pcpu_id_table, pcpu_sids);
/* This variable keeps last used shadow ID on local core.
* The valid range of shadow ID is [1..255] */
static DEFINE_PER_CPU(unsigned long, pcpu_last_used_sid);
/*
* Allocate a free shadow id and setup a valid sid mapping in given entry.
* A mapping is only valid when vcpu_id_table and pcpu_id_table are match.
*
* The caller must have preemption disabled, and keep it that way until
* it has finished with the returned shadow id (either written into the
* TLB or arch.shadow_pid, or discarded).
*/
static inline int local_sid_setup_one(struct id *entry)
{
unsigned long sid;
int ret = -1;
sid = ++(__get_cpu_var(pcpu_last_used_sid));
if (sid < NUM_TIDS) {
__get_cpu_var(pcpu_sids).entry[sid] = entry;
entry->val = sid;
entry->pentry = &__get_cpu_var(pcpu_sids).entry[sid];
ret = sid;
}
/*
* If sid == NUM_TIDS, we've run out of sids. We return -1, and
* the caller will invalidate everything and start over.
*
* sid > NUM_TIDS indicates a race, which we disable preemption to
* avoid.
*/
WARN_ON(sid > NUM_TIDS);
return ret;
}
/*
* Check if given entry contain a valid shadow id mapping.
* An ID mapping is considered valid only if
* both vcpu and pcpu know this mapping.
*
* The caller must have preemption disabled, and keep it that way until
* it has finished with the returned shadow id (either written into the
* TLB or arch.shadow_pid, or discarded).
*/
static inline int local_sid_lookup(struct id *entry)
{
if (entry && entry->val != 0 &&
__get_cpu_var(pcpu_sids).entry[entry->val] == entry &&
entry->pentry == &__get_cpu_var(pcpu_sids).entry[entry->val])
return entry->val;
return -1;
}
/* Invalidate all id mappings on local core -- call with preempt disabled */
static inline void local_sid_destroy_all(void)
{
__get_cpu_var(pcpu_last_used_sid) = 0;
memset(&__get_cpu_var(pcpu_sids), 0, sizeof(__get_cpu_var(pcpu_sids)));
}
static void *kvmppc_e500_id_table_alloc(struct kvmppc_vcpu_e500 *vcpu_e500)
{
vcpu_e500->idt = kzalloc(sizeof(struct vcpu_id_table), GFP_KERNEL);
return vcpu_e500->idt;
}
static void kvmppc_e500_id_table_free(struct kvmppc_vcpu_e500 *vcpu_e500)
{
kfree(vcpu_e500->idt);
vcpu_e500->idt = NULL;
}
/* Map guest pid to shadow.
* We use PID to keep shadow of current guest non-zero PID,
* and use PID1 to keep shadow of guest zero PID.
* So that guest tlbe with TID=0 can be accessed at any time */
static void kvmppc_e500_recalc_shadow_pid(struct kvmppc_vcpu_e500 *vcpu_e500)
{
preempt_disable();
vcpu_e500->vcpu.arch.shadow_pid = kvmppc_e500_get_sid(vcpu_e500,
get_cur_as(&vcpu_e500->vcpu),
get_cur_pid(&vcpu_e500->vcpu),
get_cur_pr(&vcpu_e500->vcpu), 1);
vcpu_e500->vcpu.arch.shadow_pid1 = kvmppc_e500_get_sid(vcpu_e500,
get_cur_as(&vcpu_e500->vcpu), 0,
get_cur_pr(&vcpu_e500->vcpu), 1);
preempt_enable();
}
/* Invalidate all mappings on vcpu */
static void kvmppc_e500_id_table_reset_all(struct kvmppc_vcpu_e500 *vcpu_e500)
{
memset(vcpu_e500->idt, 0, sizeof(struct vcpu_id_table));
/* Update shadow pid when mappings are changed */
kvmppc_e500_recalc_shadow_pid(vcpu_e500);
}
/* Invalidate one ID mapping on vcpu */
static inline void kvmppc_e500_id_table_reset_one(
struct kvmppc_vcpu_e500 *vcpu_e500,
int as, int pid, int pr)
{
struct vcpu_id_table *idt = vcpu_e500->idt;
BUG_ON(as >= 2);
BUG_ON(pid >= NUM_TIDS);
BUG_ON(pr >= 2);
idt->id[as][pid][pr].val = 0;
idt->id[as][pid][pr].pentry = NULL;
/* Update shadow pid when mappings are changed */
kvmppc_e500_recalc_shadow_pid(vcpu_e500);
}
/*
* Map guest (vcpu,AS,ID,PR) to physical core shadow id.
* This function first lookup if a valid mapping exists,
* if not, then creates a new one.
*
* The caller must have preemption disabled, and keep it that way until
* it has finished with the returned shadow id (either written into the
* TLB or arch.shadow_pid, or discarded).
*/
unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
unsigned int as, unsigned int gid,
unsigned int pr, int avoid_recursion)
{
struct vcpu_id_table *idt = vcpu_e500->idt;
int sid;
BUG_ON(as >= 2);
BUG_ON(gid >= NUM_TIDS);
BUG_ON(pr >= 2);
sid = local_sid_lookup(&idt->id[as][gid][pr]);
while (sid <= 0) {
/* No mapping yet */
sid = local_sid_setup_one(&idt->id[as][gid][pr]);
if (sid <= 0) {
_tlbil_all();
local_sid_destroy_all();
}
/* Update shadow pid when mappings are changed */
if (!avoid_recursion)
kvmppc_e500_recalc_shadow_pid(vcpu_e500);
}
return sid;
}
unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
struct kvm_book3e_206_tlb_entry *gtlbe)
{
return kvmppc_e500_get_sid(to_e500(vcpu), get_tlb_ts(gtlbe),
get_tlb_tid(gtlbe), get_cur_pr(vcpu), 0);
}
void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
if (vcpu->arch.pid != pid) {
vcpu_e500->pid[0] = vcpu->arch.pid = pid;
kvmppc_e500_recalc_shadow_pid(vcpu_e500);
}
}
/* gtlbe must not be mapped by more than one host tlbe */
void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
struct kvm_book3e_206_tlb_entry *gtlbe)
{
struct vcpu_id_table *idt = vcpu_e500->idt;
unsigned int pr, tid, ts, pid;
u32 val, eaddr;
unsigned long flags;
ts = get_tlb_ts(gtlbe);
tid = get_tlb_tid(gtlbe);
preempt_disable();
/* One guest ID may be mapped to two shadow IDs */
for (pr = 0; pr < 2; pr++) {
/*
* The shadow PID can have a valid mapping on at most one
* host CPU. In the common case, it will be valid on this
* CPU, in which case we do a local invalidation of the
* specific address.
*
* If the shadow PID is not valid on the current host CPU,
* we invalidate the entire shadow PID.
*/
pid = local_sid_lookup(&idt->id[ts][tid][pr]);
if (pid <= 0) {
kvmppc_e500_id_table_reset_one(vcpu_e500, ts, tid, pr);
continue;
}
/*
* The guest is invalidating a 4K entry which is in a PID
* that has a valid shadow mapping on this host CPU. We
* search host TLB to invalidate it's shadow TLB entry,
* similar to __tlbil_va except that we need to look in AS1.
*/
val = (pid << MAS6_SPID_SHIFT) | MAS6_SAS;
eaddr = get_tlb_eaddr(gtlbe);
local_irq_save(flags);
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