e500mc.c

Go to the documentation of this file.

/*
 * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Author: Varun Sethi, <[email protected]>
 *
 * Description:
 * This file is derived from arch/powerpc/kvm/e500.c,
 * by Yu Liu <[email protected]>.
 *
 * 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 <asm/reg.h>
#include <asm/cputable.h>
#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include <asm/dbell.h>

#include "booke.h"
#include "e500.h"

void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
{
    enum ppc_dbell dbell_type;
    unsigned long tag;

    switch (type) {
    case INT_CLASS_NONCRIT:
        dbell_type = PPC_G_DBELL;
        break;
    case INT_CLASS_CRIT:
        dbell_type = PPC_G_DBELL_CRIT;
        break;
    case INT_CLASS_MC:
        dbell_type = PPC_G_DBELL_MC;
        break;
    default:
        WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
        return;
    }


    tag = PPC_DBELL_LPID(vcpu->kvm->arch.lpid) | vcpu->vcpu_id;
    mb();
    ppc_msgsnd(dbell_type, 0, tag);
}

/* gtlbe must not be mapped by more than one host tlb entry */
void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
               struct kvm_book3e_206_tlb_entry *gtlbe)
{
    unsigned int tid, ts;
    gva_t eaddr;
    u32 val, lpid;
    unsigned long flags;

    ts = get_tlb_ts(gtlbe);
    tid = get_tlb_tid(gtlbe);
    lpid = vcpu_e500->vcpu.kvm->arch.lpid;

    /* We search the host TLB to invalidate its shadow TLB entry */
    val = (tid << 16) | ts;
    eaddr = get_tlb_eaddr(gtlbe);

    local_irq_save(flags);

    mtspr(SPRN_MAS6, val);
    mtspr(SPRN_MAS5, MAS5_SGS | lpid);

    asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
    val = mfspr(SPRN_MAS1);
    if (val & MAS1_VALID) {
        mtspr(SPRN_MAS1, val & ~MAS1_VALID);
        asm volatile("tlbwe");
    }
    mtspr(SPRN_MAS5, 0);
    /* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
    mtspr(SPRN_MAS8, 0);
    isync();

    local_irq_restore(flags);
}

void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
{
    unsigned long flags;

    local_irq_save(flags);
    mtspr(SPRN_MAS5, MAS5_SGS | vcpu_e500->vcpu.kvm->arch.lpid);
    asm volatile("tlbilxlpid");
    mtspr(SPRN_MAS5, 0);
    local_irq_restore(flags);
}

void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
{
    vcpu->arch.pid = pid;
}

void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
{
}

void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
    struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);

    kvmppc_booke_vcpu_load(vcpu, cpu);

    mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
    mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
    mtspr(SPRN_GPIR, vcpu->vcpu_id);
    mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
    mtspr(SPRN_EPLC, vcpu->arch.eplc);
    mtspr(SPRN_EPSC, vcpu->arch.epsc);

    mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
    mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
    mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
    mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
    mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
    mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
    mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);

    mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
    mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);

    mtspr(SPRN_GEPR, vcpu->arch.epr);
    mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
    mtspr(SPRN_GESR, vcpu->arch.shared->esr);

    if (vcpu->arch.oldpir != mfspr(SPRN_PIR))
        kvmppc_e500_tlbil_all(vcpu_e500);

    kvmppc_load_guest_fp(vcpu);
}

void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
    vcpu->arch.eplc = mfspr(SPRN_EPLC);
    vcpu->arch.epsc = mfspr(SPRN_EPSC);

    vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
    vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
    vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
    vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);

    vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
    vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);

    vcpu->arch.epr = mfspr(SPRN_GEPR);
    vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
    vcpu->arch.shared->esr = mfspr(SPRN_GESR);

    vcpu->arch.oldpir = mfspr(SPRN_PIR);

    kvmppc_booke_vcpu_put(vcpu);
}

int kvmppc_core_check_processor_compat(void)
{
    int r;

    if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
        r = 0;
    else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 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);

    vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
                 SPRN_EPCR_DUVD;
#ifdef CONFIG_64BIT
    vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
#endif
    vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
    vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
    vcpu->arch.epsc = vcpu->arch.eplc;

    vcpu->arch.pvr = mfspr(SPRN_PVR);
    vcpu_e500->svr = mfspr(SPRN_SVR);

    vcpu->arch.cpu_type = KVM_CPU_E500MC;

    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_PM |
                   KVM_SREGS_E_PC;
    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;

    kvmppc_get_sregs_e500_tlb(vcpu, sregs);

    sregs->u.e.ivor_high[3] =
        vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
    sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
    sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];

    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);
    int ret;

    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;
    }

    ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
    if (ret < 0)
        return ret;

    if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
        return 0;

    if (sregs->u.e.features & KVM_SREGS_E_PM) {
        vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
            sregs->u.e.ivor_high[3];
    }

    if (sregs->u.e.features & KVM_SREGS_E_PC) {
        vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
            sregs->u.e.ivor_high[4];
        vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
            sregs->u.e.ivor_high[5];
    }

    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;

    /* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
    vcpu->arch.oldpir = 0xffffffff;

    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);
    kvmppc_e500_tlb_uninit(vcpu_e500);
    kvm_vcpu_uninit(vcpu);
    kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
}

int kvmppc_core_init_vm(struct kvm *kvm)
{
    int lpid;

    lpid = kvmppc_alloc_lpid();
    if (lpid < 0)
        return lpid;

    kvm->arch.lpid = lpid;
    return 0;
}

void kvmppc_core_destroy_vm(struct kvm *kvm)
{
    kvmppc_free_lpid(kvm->arch.lpid);
}

static int __init kvmppc_e500mc_init(void)
{
    int r;

    r = kvmppc_booke_init();
    if (r)
        return r;

    kvmppc_init_lpid(64);
    kvmppc_claim_lpid(0); /* host */

    return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
}

static void __exit kvmppc_e500mc_exit(void)
{
    kvmppc_booke_exit();
}

module_init(kvmppc_e500mc_init);
module_exit(kvmppc_e500mc_exit);