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552 lines
14 KiB
552 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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, <[email protected]> |
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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 <[email protected]>. |
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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/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 = __this_cpu_inc_return(pcpu_last_used_sid); |
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if (sid < NUM_TIDS) { |
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__this_cpu_write(pcpu_sids.entry[sid], entry); |
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entry->val = sid; |
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entry->pentry = this_cpu_ptr(&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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__this_cpu_read(pcpu_sids.entry[entry->val]) == entry && |
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entry->pentry == this_cpu_ptr(&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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__this_cpu_write(pcpu_last_used_sid, 0); |
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memset(this_cpu_ptr(&pcpu_sids), 0, sizeof(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; |
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int 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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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 int kvmppc_core_vcpu_create_e500(struct kvm_vcpu *vcpu) |
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{ |
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struct kvmppc_vcpu_e500 *vcpu_e500; |
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int err; |
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BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0); |
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vcpu_e500 = to_e500(vcpu); |
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if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL) |
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return -ENOMEM; |
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err = kvmppc_e500_tlb_init(vcpu_e500); |
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if (err) |
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goto uninit_id; |
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vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO); |
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if (!vcpu->arch.shared) { |
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err = -ENOMEM; |
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goto uninit_tlb; |
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} |
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return 0; |
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uninit_tlb: |
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kvmppc_e500_tlb_uninit(vcpu_e500); |
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uninit_id: |
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kvmppc_e500_id_table_free(vcpu_e500); |
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return err; |
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} |
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static void kvmppc_core_vcpu_free_e500(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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free_page((unsigned long)vcpu->arch.shared); |
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kvmppc_e500_tlb_uninit(vcpu_e500); |
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kvmppc_e500_id_table_free(vcpu_e500); |
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} |
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static int kvmppc_core_init_vm_e500(struct kvm *kvm) |
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{ |
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return 0; |
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} |
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static void kvmppc_core_destroy_vm_e500(struct kvm *kvm) |
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{ |
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} |
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static struct kvmppc_ops kvm_ops_e500 = { |
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.get_sregs = kvmppc_core_get_sregs_e500, |
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.set_sregs = kvmppc_core_set_sregs_e500, |
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.get_one_reg = kvmppc_get_one_reg_e500, |
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.set_one_reg = kvmppc_set_one_reg_e500, |
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.vcpu_load = kvmppc_core_vcpu_load_e500, |
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.vcpu_put = kvmppc_core_vcpu_put_e500, |
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.vcpu_create = kvmppc_core_vcpu_create_e500, |
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.vcpu_free = kvmppc_core_vcpu_free_e500, |
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.init_vm = kvmppc_core_init_vm_e500, |
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.destroy_vm = kvmppc_core_destroy_vm_e500, |
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.emulate_op = kvmppc_core_emulate_op_e500, |
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.emulate_mtspr = kvmppc_core_emulate_mtspr_e500, |
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.emulate_mfspr = kvmppc_core_emulate_mfspr_e500, |
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}; |
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|
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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");
|
|
|