KVM: PPC: e500mc support

Add processor support for e500mc, using hardware virtualization support
(GS-mode).

Current issues include:
 - No support for external proxy (coreint) interrupt mode in the guest.

Includes work by Ashish Kalra <Ashish.Kalra@freescale.com>,
Varun Sethi <Varun.Sethi@freescale.com>, and
Liu Yu <yu.liu@freescale.com>.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 342 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
new file mode 100644
index 000000000000..fe6c1de6b701
--- /dev/null
+++ b/arch/powerpc/kvm/e500mc.c
@@ -0,0 +1,342 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: Varun Sethi, <varun.sethi@freescale.com>
+ *
+ * Description:
+ * This file is derived from arch/powerpc/kvm/e500.c,
+ * by Yu Liu <yu.liu@freescale.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 <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;
+        u32 val, eaddr, 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;
+        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);