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![Alexander Graf](/assets/img/avatar_default.png)
Systems that support automatic loading of kernel modules through device aliases should try and automatically load kvm when /dev/kvm gets opened. Add code to support that magic for all PPC kvm targets, even the ones that don't support modules yet. Signed-off-by: Alexander Graf <agraf@suse.de>
579 lines
15 KiB
C
579 lines
15 KiB
C
/*
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* Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
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*
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* Author: Yu Liu, <yu.liu@freescale.com>
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*
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* Description:
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* This file is derived from arch/powerpc/kvm/44x.c,
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* by Hollis Blanchard <hollisb@us.ibm.com>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*/
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#include <linux/kvm_host.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <asm/reg.h>
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#include <asm/cputable.h>
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#include <asm/tlbflush.h>
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#include <asm/kvm_ppc.h>
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#include "../mm/mmu_decl.h"
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#include "booke.h"
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#include "e500.h"
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struct id {
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unsigned long val;
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struct id **pentry;
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};
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#define NUM_TIDS 256
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/*
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* This table provide mappings from:
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* (guestAS,guestTID,guestPR) --> ID of physical cpu
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* guestAS [0..1]
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* guestTID [0..255]
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* guestPR [0..1]
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* ID [1..255]
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* Each vcpu keeps one vcpu_id_table.
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*/
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struct vcpu_id_table {
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struct id id[2][NUM_TIDS][2];
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};
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/*
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* This table provide reversed mappings of vcpu_id_table:
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* ID --> address of vcpu_id_table item.
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* Each physical core has one pcpu_id_table.
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*/
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struct pcpu_id_table {
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struct id *entry[NUM_TIDS];
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};
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static DEFINE_PER_CPU(struct pcpu_id_table, pcpu_sids);
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/* This variable keeps last used shadow ID on local core.
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* The valid range of shadow ID is [1..255] */
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static DEFINE_PER_CPU(unsigned long, pcpu_last_used_sid);
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/*
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* Allocate a free shadow id and setup a valid sid mapping in given entry.
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* A mapping is only valid when vcpu_id_table and pcpu_id_table are match.
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*
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* The caller must have preemption disabled, and keep it that way until
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* it has finished with the returned shadow id (either written into the
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* TLB or arch.shadow_pid, or discarded).
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*/
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static inline int local_sid_setup_one(struct id *entry)
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{
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unsigned long sid;
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int ret = -1;
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sid = ++(__get_cpu_var(pcpu_last_used_sid));
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if (sid < NUM_TIDS) {
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__get_cpu_var(pcpu_sids).entry[sid] = entry;
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entry->val = sid;
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entry->pentry = &__get_cpu_var(pcpu_sids).entry[sid];
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ret = sid;
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}
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/*
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* If sid == NUM_TIDS, we've run out of sids. We return -1, and
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* the caller will invalidate everything and start over.
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*
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* sid > NUM_TIDS indicates a race, which we disable preemption to
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* avoid.
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*/
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WARN_ON(sid > NUM_TIDS);
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return ret;
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}
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/*
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* Check if given entry contain a valid shadow id mapping.
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* An ID mapping is considered valid only if
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* both vcpu and pcpu know this mapping.
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*
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* The caller must have preemption disabled, and keep it that way until
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* it has finished with the returned shadow id (either written into the
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* TLB or arch.shadow_pid, or discarded).
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*/
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static inline int local_sid_lookup(struct id *entry)
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{
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if (entry && entry->val != 0 &&
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__get_cpu_var(pcpu_sids).entry[entry->val] == entry &&
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entry->pentry == &__get_cpu_var(pcpu_sids).entry[entry->val])
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return entry->val;
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return -1;
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}
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/* Invalidate all id mappings on local core -- call with preempt disabled */
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static inline void local_sid_destroy_all(void)
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{
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__get_cpu_var(pcpu_last_used_sid) = 0;
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memset(&__get_cpu_var(pcpu_sids), 0, sizeof(__get_cpu_var(pcpu_sids)));
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}
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static void *kvmppc_e500_id_table_alloc(struct kvmppc_vcpu_e500 *vcpu_e500)
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{
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vcpu_e500->idt = kzalloc(sizeof(struct vcpu_id_table), GFP_KERNEL);
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return vcpu_e500->idt;
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}
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static void kvmppc_e500_id_table_free(struct kvmppc_vcpu_e500 *vcpu_e500)
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{
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kfree(vcpu_e500->idt);
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vcpu_e500->idt = NULL;
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}
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/* Map guest pid to shadow.
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* We use PID to keep shadow of current guest non-zero PID,
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* and use PID1 to keep shadow of guest zero PID.
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* So that guest tlbe with TID=0 can be accessed at any time */
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static void kvmppc_e500_recalc_shadow_pid(struct kvmppc_vcpu_e500 *vcpu_e500)
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{
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preempt_disable();
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vcpu_e500->vcpu.arch.shadow_pid = kvmppc_e500_get_sid(vcpu_e500,
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get_cur_as(&vcpu_e500->vcpu),
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get_cur_pid(&vcpu_e500->vcpu),
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get_cur_pr(&vcpu_e500->vcpu), 1);
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vcpu_e500->vcpu.arch.shadow_pid1 = kvmppc_e500_get_sid(vcpu_e500,
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get_cur_as(&vcpu_e500->vcpu), 0,
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get_cur_pr(&vcpu_e500->vcpu), 1);
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preempt_enable();
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}
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/* Invalidate all mappings on vcpu */
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static void kvmppc_e500_id_table_reset_all(struct kvmppc_vcpu_e500 *vcpu_e500)
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{
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memset(vcpu_e500->idt, 0, sizeof(struct vcpu_id_table));
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/* Update shadow pid when mappings are changed */
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kvmppc_e500_recalc_shadow_pid(vcpu_e500);
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}
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/* Invalidate one ID mapping on vcpu */
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static inline void kvmppc_e500_id_table_reset_one(
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struct kvmppc_vcpu_e500 *vcpu_e500,
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int as, int pid, int pr)
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{
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struct vcpu_id_table *idt = vcpu_e500->idt;
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BUG_ON(as >= 2);
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BUG_ON(pid >= NUM_TIDS);
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BUG_ON(pr >= 2);
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idt->id[as][pid][pr].val = 0;
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idt->id[as][pid][pr].pentry = NULL;
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/* Update shadow pid when mappings are changed */
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kvmppc_e500_recalc_shadow_pid(vcpu_e500);
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}
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/*
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* Map guest (vcpu,AS,ID,PR) to physical core shadow id.
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* This function first lookup if a valid mapping exists,
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* if not, then creates a new one.
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*
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* The caller must have preemption disabled, and keep it that way until
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* it has finished with the returned shadow id (either written into the
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* TLB or arch.shadow_pid, or discarded).
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*/
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unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
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unsigned int as, unsigned int gid,
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unsigned int pr, int avoid_recursion)
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{
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struct vcpu_id_table *idt = vcpu_e500->idt;
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int sid;
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BUG_ON(as >= 2);
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BUG_ON(gid >= NUM_TIDS);
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BUG_ON(pr >= 2);
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sid = local_sid_lookup(&idt->id[as][gid][pr]);
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while (sid <= 0) {
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/* No mapping yet */
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sid = local_sid_setup_one(&idt->id[as][gid][pr]);
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if (sid <= 0) {
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_tlbil_all();
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local_sid_destroy_all();
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}
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/* Update shadow pid when mappings are changed */
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if (!avoid_recursion)
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kvmppc_e500_recalc_shadow_pid(vcpu_e500);
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}
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return sid;
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}
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unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
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struct kvm_book3e_206_tlb_entry *gtlbe)
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{
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return kvmppc_e500_get_sid(to_e500(vcpu), get_tlb_ts(gtlbe),
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get_tlb_tid(gtlbe), get_cur_pr(vcpu), 0);
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}
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void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
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{
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struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
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if (vcpu->arch.pid != pid) {
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vcpu_e500->pid[0] = vcpu->arch.pid = pid;
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kvmppc_e500_recalc_shadow_pid(vcpu_e500);
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}
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}
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/* gtlbe must not be mapped by more than one host tlbe */
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void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
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struct kvm_book3e_206_tlb_entry *gtlbe)
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{
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struct vcpu_id_table *idt = vcpu_e500->idt;
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unsigned int pr, tid, ts, pid;
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u32 val, eaddr;
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unsigned long flags;
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ts = get_tlb_ts(gtlbe);
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tid = get_tlb_tid(gtlbe);
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preempt_disable();
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/* One guest ID may be mapped to two shadow IDs */
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for (pr = 0; pr < 2; pr++) {
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/*
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* The shadow PID can have a valid mapping on at most one
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* host CPU. In the common case, it will be valid on this
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* CPU, in which case we do a local invalidation of the
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* specific address.
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*
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* If the shadow PID is not valid on the current host CPU,
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* we invalidate the entire shadow PID.
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*/
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pid = local_sid_lookup(&idt->id[ts][tid][pr]);
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if (pid <= 0) {
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kvmppc_e500_id_table_reset_one(vcpu_e500, ts, tid, pr);
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continue;
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}
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/*
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* The guest is invalidating a 4K entry which is in a PID
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* that has a valid shadow mapping on this host CPU. We
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* search host TLB to invalidate it's shadow TLB entry,
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* similar to __tlbil_va except that we need to look in AS1.
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*/
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val = (pid << MAS6_SPID_SHIFT) | MAS6_SAS;
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eaddr = get_tlb_eaddr(gtlbe);
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local_irq_save(flags);
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mtspr(SPRN_MAS6, val);
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asm volatile("tlbsx 0, %[eaddr]" : : [eaddr] "r" (eaddr));
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val = mfspr(SPRN_MAS1);
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if (val & MAS1_VALID) {
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mtspr(SPRN_MAS1, val & ~MAS1_VALID);
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asm volatile("tlbwe");
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}
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local_irq_restore(flags);
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}
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preempt_enable();
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}
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void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
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{
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kvmppc_e500_id_table_reset_all(vcpu_e500);
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}
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void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
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{
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/* Recalc shadow pid since MSR changes */
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kvmppc_e500_recalc_shadow_pid(to_e500(vcpu));
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}
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void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
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{
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}
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void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
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{
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}
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static void kvmppc_core_vcpu_load_e500(struct kvm_vcpu *vcpu, int cpu)
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{
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kvmppc_booke_vcpu_load(vcpu, cpu);
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/* Shadow PID may be expired on local core */
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kvmppc_e500_recalc_shadow_pid(to_e500(vcpu));
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}
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static void kvmppc_core_vcpu_put_e500(struct kvm_vcpu *vcpu)
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{
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#ifdef CONFIG_SPE
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if (vcpu->arch.shadow_msr & MSR_SPE)
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kvmppc_vcpu_disable_spe(vcpu);
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#endif
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kvmppc_booke_vcpu_put(vcpu);
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}
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int kvmppc_core_check_processor_compat(void)
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{
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int r;
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if (strcmp(cur_cpu_spec->cpu_name, "e500v2") == 0)
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r = 0;
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else
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r = -ENOTSUPP;
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return r;
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}
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static void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *vcpu_e500)
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{
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struct kvm_book3e_206_tlb_entry *tlbe;
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/* Insert large initial mapping for guest. */
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tlbe = get_entry(vcpu_e500, 1, 0);
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tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_256M);
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tlbe->mas2 = 0;
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tlbe->mas7_3 = E500_TLB_SUPER_PERM_MASK;
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/* 4K map for serial output. Used by kernel wrapper. */
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tlbe = get_entry(vcpu_e500, 1, 1);
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tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_4K);
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tlbe->mas2 = (0xe0004500 & 0xFFFFF000) | MAS2_I | MAS2_G;
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tlbe->mas7_3 = (0xe0004500 & 0xFFFFF000) | E500_TLB_SUPER_PERM_MASK;
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}
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int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
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{
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struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
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kvmppc_e500_tlb_setup(vcpu_e500);
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/* Registers init */
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vcpu->arch.pvr = mfspr(SPRN_PVR);
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vcpu_e500->svr = mfspr(SPRN_SVR);
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vcpu->arch.cpu_type = KVM_CPU_E500V2;
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return 0;
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}
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static int kvmppc_core_get_sregs_e500(struct kvm_vcpu *vcpu,
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struct kvm_sregs *sregs)
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{
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struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
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sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_SPE |
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KVM_SREGS_E_PM;
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sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
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sregs->u.e.impl.fsl.features = 0;
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sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
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sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
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sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
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sregs->u.e.ivor_high[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL];
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sregs->u.e.ivor_high[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA];
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sregs->u.e.ivor_high[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND];
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sregs->u.e.ivor_high[3] =
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vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
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kvmppc_get_sregs_ivor(vcpu, sregs);
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kvmppc_get_sregs_e500_tlb(vcpu, sregs);
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return 0;
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}
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static int kvmppc_core_set_sregs_e500(struct kvm_vcpu *vcpu,
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struct kvm_sregs *sregs)
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{
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struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
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int ret;
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if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
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vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
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vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
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vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
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}
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ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
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if (ret < 0)
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return ret;
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if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
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return 0;
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if (sregs->u.e.features & KVM_SREGS_E_SPE) {
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vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL] =
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sregs->u.e.ivor_high[0];
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vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA] =
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sregs->u.e.ivor_high[1];
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vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND] =
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sregs->u.e.ivor_high[2];
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}
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if (sregs->u.e.features & KVM_SREGS_E_PM) {
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vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
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sregs->u.e.ivor_high[3];
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}
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return kvmppc_set_sregs_ivor(vcpu, sregs);
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}
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static int kvmppc_get_one_reg_e500(struct kvm_vcpu *vcpu, u64 id,
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union kvmppc_one_reg *val)
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{
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int r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
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return r;
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}
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static int kvmppc_set_one_reg_e500(struct kvm_vcpu *vcpu, u64 id,
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union kvmppc_one_reg *val)
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{
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int r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
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return r;
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}
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static struct kvm_vcpu *kvmppc_core_vcpu_create_e500(struct kvm *kvm,
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unsigned int id)
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{
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struct kvmppc_vcpu_e500 *vcpu_e500;
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struct kvm_vcpu *vcpu;
|
|
int err;
|
|
|
|
vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
|
|
if (!vcpu_e500) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
vcpu = &vcpu_e500->vcpu;
|
|
err = kvm_vcpu_init(vcpu, kvm, id);
|
|
if (err)
|
|
goto free_vcpu;
|
|
|
|
if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL)
|
|
goto uninit_vcpu;
|
|
|
|
err = kvmppc_e500_tlb_init(vcpu_e500);
|
|
if (err)
|
|
goto uninit_id;
|
|
|
|
vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
|
|
if (!vcpu->arch.shared)
|
|
goto uninit_tlb;
|
|
|
|
return vcpu;
|
|
|
|
uninit_tlb:
|
|
kvmppc_e500_tlb_uninit(vcpu_e500);
|
|
uninit_id:
|
|
kvmppc_e500_id_table_free(vcpu_e500);
|
|
uninit_vcpu:
|
|
kvm_vcpu_uninit(vcpu);
|
|
free_vcpu:
|
|
kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
|
|
out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void kvmppc_core_vcpu_free_e500(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
|
|
|
|
free_page((unsigned long)vcpu->arch.shared);
|
|
kvmppc_e500_tlb_uninit(vcpu_e500);
|
|
kvmppc_e500_id_table_free(vcpu_e500);
|
|
kvm_vcpu_uninit(vcpu);
|
|
kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
|
|
}
|
|
|
|
static int kvmppc_core_init_vm_e500(struct kvm *kvm)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void kvmppc_core_destroy_vm_e500(struct kvm *kvm)
|
|
{
|
|
}
|
|
|
|
static struct kvmppc_ops kvm_ops_e500 = {
|
|
.get_sregs = kvmppc_core_get_sregs_e500,
|
|
.set_sregs = kvmppc_core_set_sregs_e500,
|
|
.get_one_reg = kvmppc_get_one_reg_e500,
|
|
.set_one_reg = kvmppc_set_one_reg_e500,
|
|
.vcpu_load = kvmppc_core_vcpu_load_e500,
|
|
.vcpu_put = kvmppc_core_vcpu_put_e500,
|
|
.vcpu_create = kvmppc_core_vcpu_create_e500,
|
|
.vcpu_free = kvmppc_core_vcpu_free_e500,
|
|
.mmu_destroy = kvmppc_mmu_destroy_e500,
|
|
.init_vm = kvmppc_core_init_vm_e500,
|
|
.destroy_vm = kvmppc_core_destroy_vm_e500,
|
|
.emulate_op = kvmppc_core_emulate_op_e500,
|
|
.emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
|
|
.emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
|
|
};
|
|
|
|
static int __init kvmppc_e500_init(void)
|
|
{
|
|
int r, i;
|
|
unsigned long ivor[3];
|
|
/* Process remaining handlers above the generic first 16 */
|
|
unsigned long *handler = &kvmppc_booke_handler_addr[16];
|
|
unsigned long handler_len;
|
|
unsigned long max_ivor = 0;
|
|
|
|
r = kvmppc_core_check_processor_compat();
|
|
if (r)
|
|
goto err_out;
|
|
|
|
r = kvmppc_booke_init();
|
|
if (r)
|
|
goto err_out;
|
|
|
|
/* copy extra E500 exception handlers */
|
|
ivor[0] = mfspr(SPRN_IVOR32);
|
|
ivor[1] = mfspr(SPRN_IVOR33);
|
|
ivor[2] = mfspr(SPRN_IVOR34);
|
|
for (i = 0; i < 3; i++) {
|
|
if (ivor[i] > ivor[max_ivor])
|
|
max_ivor = i;
|
|
|
|
handler_len = handler[i + 1] - handler[i];
|
|
memcpy((void *)kvmppc_booke_handlers + ivor[i],
|
|
(void *)handler[i], handler_len);
|
|
}
|
|
handler_len = handler[max_ivor + 1] - handler[max_ivor];
|
|
flush_icache_range(kvmppc_booke_handlers, kvmppc_booke_handlers +
|
|
ivor[max_ivor] + handler_len);
|
|
|
|
r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
|
|
if (r)
|
|
goto err_out;
|
|
kvm_ops_e500.owner = THIS_MODULE;
|
|
kvmppc_pr_ops = &kvm_ops_e500;
|
|
|
|
err_out:
|
|
return r;
|
|
}
|
|
|
|
static void __exit kvmppc_e500_exit(void)
|
|
{
|
|
kvmppc_pr_ops = NULL;
|
|
kvmppc_booke_exit();
|
|
}
|
|
|
|
module_init(kvmppc_e500_init);
|
|
module_exit(kvmppc_e500_exit);
|
|
MODULE_ALIAS_MISCDEV(KVM_MINOR);
|
|
MODULE_ALIAS("devname:kvm");
|