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linux-stable/arch/powerpc/kvm/e500.c
Alexander Graf af8f38b349 KVM: PPC: Add sanity checking to vcpu_run 
There are multiple features in PowerPC KVM that can now be enabled
depending on the user's wishes. Some of the combinations don't make
sense or don't work though.

So this patch adds a way to check if the executing environment would
actually be able to run the guest properly. It also adds sanity
checks if PVR is set (should always be true given the current code
flow), if PAPR is only used with book3s_64 where it works and that
HV KVM is only used in PAPR mode.

Signed-off-by: Alexander Graf <agraf@suse.de>
2011-09-25 19:52:27 +03:00

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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 <asm/reg.h>
#include <asm/cputable.h>
#include <asm/tlbflush.h>
#include <asm/kvm_e500.h>
#include <asm/kvm_ppc.h>
#include "booke.h"
#include "e500_tlb.h"
void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
{
}
void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
{
}
void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
kvmppc_e500_tlb_load(vcpu, cpu);
}
void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
kvmppc_e500_tlb_put(vcpu);
#ifdef CONFIG_SPE
if (vcpu->arch.shadow_msr & MSR_SPE)
kvmppc_vcpu_disable_spe(vcpu);
#endif
}
int kvmppc_core_check_processor_compat(void)
{
int r;
if (strcmp(cur_cpu_spec->cpu_name, "e500v2") == 0)
r = 0;
else
r = -ENOTSUPP;
return r;
}
int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
kvmppc_e500_tlb_setup(vcpu_e500);
/* Registers init */
vcpu->arch.pvr = mfspr(SPRN_PVR);
vcpu_e500->svr = mfspr(SPRN_SVR);
/* Since booke kvm only support one core, update all vcpus' PIR to 0 */
vcpu->vcpu_id = 0;
vcpu->arch.cpu_type = KVM_CPU_E500V2;
return 0;
}
/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
struct kvm_translation *tr)
{
int index;
gva_t eaddr;
u8 pid;
u8 as;
eaddr = tr->linear_address;
pid = (tr->linear_address >> 32) & 0xff;
as = (tr->linear_address >> 40) & 0x1;
index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
if (index < 0) {
tr->valid = 0;
return 0;
}
tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
/* XXX what does "writeable" and "usermode" even mean? */
tr->valid = 1;
return 0;
}
void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_SPE |
KVM_SREGS_E_PM;
sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
sregs->u.e.impl.fsl.features = 0;
sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
sregs->u.e.mas0 = vcpu_e500->mas0;
sregs->u.e.mas1 = vcpu_e500->mas1;
sregs->u.e.mas2 = vcpu_e500->mas2;
sregs->u.e.mas7_3 = ((u64)vcpu_e500->mas7 << 32) | vcpu_e500->mas3;
sregs->u.e.mas4 = vcpu_e500->mas4;
sregs->u.e.mas6 = vcpu_e500->mas6;
sregs->u.e.mmucfg = mfspr(SPRN_MMUCFG);
sregs->u.e.tlbcfg[0] = vcpu_e500->tlb0cfg;
sregs->u.e.tlbcfg[1] = vcpu_e500->tlb1cfg;
sregs->u.e.tlbcfg[2] = 0;
sregs->u.e.tlbcfg[3] = 0;
sregs->u.e.ivor_high[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL];
sregs->u.e.ivor_high[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA];
sregs->u.e.ivor_high[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND];
sregs->u.e.ivor_high[3] =
vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
kvmppc_get_sregs_ivor(vcpu, sregs);
}
int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
}
if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) {
vcpu_e500->mas0 = sregs->u.e.mas0;
vcpu_e500->mas1 = sregs->u.e.mas1;
vcpu_e500->mas2 = sregs->u.e.mas2;
vcpu_e500->mas7 = sregs->u.e.mas7_3 >> 32;
vcpu_e500->mas3 = (u32)sregs->u.e.mas7_3;
vcpu_e500->mas4 = sregs->u.e.mas4;
vcpu_e500->mas6 = sregs->u.e.mas6;
}
if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
return 0;
if (sregs->u.e.features & KVM_SREGS_E_SPE) {
vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL] =
sregs->u.e.ivor_high[0];
vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA] =
sregs->u.e.ivor_high[1];
vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND] =
sregs->u.e.ivor_high[2];
}
if (sregs->u.e.features & KVM_SREGS_E_PM) {
vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
sregs->u.e.ivor_high[3];
}
return kvmppc_set_sregs_ivor(vcpu, sregs);
}
struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
{
struct kvmppc_vcpu_e500 *vcpu_e500;
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;
err = kvmppc_e500_tlb_init(vcpu_e500);
if (err)
goto uninit_vcpu;
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_vcpu:
kvm_vcpu_uninit(vcpu);
free_vcpu:
kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
out:
return ERR_PTR(err);
}
void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
free_page((unsigned long)vcpu->arch.shared);
kvm_vcpu_uninit(vcpu);
kvmppc_e500_tlb_uninit(vcpu_e500);
kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
}
static int __init kvmppc_e500_init(void)
{
int r, i;
unsigned long ivor[3];
unsigned long max_ivor = 0;
r = kvmppc_booke_init();
if (r)
return r;
/* 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] > max_ivor)
max_ivor = ivor[i];
memcpy((void *)kvmppc_booke_handlers + ivor[i],
kvmppc_handlers_start + (i + 16) * kvmppc_handler_len,
kvmppc_handler_len);
}
flush_icache_range(kvmppc_booke_handlers,
kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
}
static void __exit kvmppc_e500_exit(void)
{
kvmppc_booke_exit();
}
module_init(kvmppc_e500_init);
module_exit(kvmppc_e500_exit);
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