Add book3s_64 guest MMU

To be able to run a guest, we also need to implement a guest MMU.

This patch adds MMU handling for Book3s_64 guests.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 476 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
new file mode 100644
index 000000000000..a31f9c677d23
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -0,0 +1,476 @@
+/*
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright SUSE Linux Products GmbH 2009
+ *
+ * Authors: Alexander Graf <agraf@suse.de>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/highmem.h>
+
+#include <asm/tlbflush.h>
+#include <asm/kvm_ppc.h>
+#include <asm/kvm_book3s.h>
+
+/* #define DEBUG_MMU */
+
+#ifdef DEBUG_MMU
+#define dprintk(X...) printk(KERN_INFO X)
+#else
+#define dprintk(X...) do { } while(0)
+#endif
+
+static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
+{
+        kvmppc_set_msr(vcpu, MSR_SF);
+}
+
+static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
+                                struct kvmppc_vcpu_book3s *vcpu_book3s,
+                                gva_t eaddr)
+{
+        int i;
+        u64 esid = GET_ESID(eaddr);
+        u64 esid_1t = GET_ESID_1T(eaddr);
+
+        for (i = 0; i < vcpu_book3s->slb_nr; i++) {
+                u64 cmp_esid = esid;
+
+                if (!vcpu_book3s->slb[i].valid)
+                        continue;
+
+                if (vcpu_book3s->slb[i].large)
+                        cmp_esid = esid_1t;
+
+                if (vcpu_book3s->slb[i].esid == cmp_esid)
+                        return &vcpu_book3s->slb[i];
+        }
+
+        dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n",
+                eaddr, esid, esid_1t);
+        for (i = 0; i < vcpu_book3s->slb_nr; i++) {
+            if (vcpu_book3s->slb[i].vsid)
+                dprintk("  %d: %c%c %llx %llx\n", i,
+                        vcpu_book3s->slb[i].valid ? 'v' : ' ',
+                        vcpu_book3s->slb[i].large ? 'l' : ' ',
+                        vcpu_book3s->slb[i].esid,
+                        vcpu_book3s->slb[i].vsid);
+        }
+
+        return NULL;
+}
+
+static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
+                                         bool data)
+{
+        struct kvmppc_slb *slb;
+
+        slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), eaddr);
+        if (!slb)
+                return 0;
+
+        if (slb->large)
+                return (((u64)eaddr >> 12) & 0xfffffff) |
+                       (((u64)slb->vsid) << 28);
+
+        return (((u64)eaddr >> 12) & 0xffff) | (((u64)slb->vsid) << 16);
+}
+
+static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)
+{
+        return slbe->large ? 24 : 12;
+}
+
+static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
+{
+        int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
+        return ((eaddr & 0xfffffff) >> p);
+}
+
+static hva_t kvmppc_mmu_book3s_64_get_pteg(
+                                struct kvmppc_vcpu_book3s *vcpu_book3s,
+                                struct kvmppc_slb *slbe, gva_t eaddr,
+                                bool second)
+{
+        u64 hash, pteg, htabsize;
+        u32 page;
+        hva_t r;
+
+        page = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
+        htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1);
+
+        hash = slbe->vsid ^ page;
+        if (second)
+                hash = ~hash;
+        hash &= ((1ULL << 39ULL) - 1ULL);
+        hash &= htabsize;
+        hash <<= 7ULL;
+
+        pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
+        pteg |= hash;
+
+        dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n",
+                page, vcpu_book3s->sdr1, pteg, slbe->vsid);
+
+        r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
+        if (kvm_is_error_hva(r))
+                return r;
+        return r | (pteg & ~PAGE_MASK);
+}
+
+static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)
+{
+        int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
+        u64 avpn;
+
+        avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
+        avpn |= slbe->vsid << (28 - p);
+
+        if (p < 24)
+                avpn >>= ((80 - p) - 56) - 8;
+        else
+                avpn <<= 8;
+
+        return avpn;
+}
+
+static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
+                                struct kvmppc_pte *gpte, bool data)
+{
+        struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+        struct kvmppc_slb *slbe;
+        hva_t ptegp;
+        u64 pteg[16];
+        u64 avpn = 0;
+        int i;
+        u8 key = 0;
+        bool found = false;
+        bool perm_err = false;
+        int second = 0;
+
+        slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr);
+        if (!slbe)
+                goto no_seg_found;
+
+do_second:
+        ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);
+        if (kvm_is_error_hva(ptegp))
+                goto no_page_found;
+
+        avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);
+
+        if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
+                printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp);
+                goto no_page_found;
+        }
+
+        if ((vcpu->arch.msr & MSR_PR) && slbe->Kp)
+                key = 4;
+        else if (!(vcpu->arch.msr & MSR_PR) && slbe->Ks)
+                key = 4;
+
+        for (i=0; i<16; i+=2) {
+                u64 v = pteg[i];
+                u64 r = pteg[i+1];
+
+                /* Valid check */
+                if (!(v & HPTE_V_VALID))
+                        continue;
+                /* Hash check */
+                if ((v & HPTE_V_SECONDARY) != second)
+                        continue;
+
+                /* AVPN compare */
+                if (HPTE_V_AVPN_VAL(avpn) == HPTE_V_AVPN_VAL(v)) {
+                        u8 pp = (r & HPTE_R_PP) | key;
+                        int eaddr_mask = 0xFFF;
+
+                        gpte->eaddr = eaddr;
+                        gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu,
+                                                                    eaddr,
+                                                                    data);
+                        if (slbe->large)
+                                eaddr_mask = 0xFFFFFF;
+                        gpte->raddr = (r & HPTE_R_RPN) | (eaddr & eaddr_mask);
+                        gpte->may_execute = ((r & HPTE_R_N) ? false : true);
+                        gpte->may_read = false;
+                        gpte->may_write = false;
+
+                        switch (pp) {
+                        case 0:
+                        case 1:
+                        case 2:
+                        case 6:
+                                gpte->may_write = true;
+                                /* fall through */
+                        case 3:
+                        case 5:
+                        case 7:
+                                gpte->may_read = true;
+                                break;
+                        }
+
+                        if (!gpte->may_read) {
+                                perm_err = true;
+                                continue;
+                        }
+
+                        dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
+                                "-> 0x%llx\n",
+                                eaddr, avpn, gpte->vpage, gpte->raddr);
+                        found = true;
+                        break;
+                }
+        }
+
+        /* Update PTE R and C bits, so the guest's swapper knows we used the
+         * page */
+        if (found) {
+                u32 oldr = pteg[i+1];
+
+                if (gpte->may_read) {
+                        /* Set the accessed flag */
+                        pteg[i+1] |= HPTE_R_R;
+                }
+                if (gpte->may_write) {
+                        /* Set the dirty flag */
+                        pteg[i+1] |= HPTE_R_C;
+                } else {
+                        dprintk("KVM: Mapping read-only page!\n");
+                }
+
+                /* Write back into the PTEG */
+                if (pteg[i+1] != oldr)
+                        copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));
+
+                return 0;
+        } else {
+                dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx "
+                        "ptegp=0x%lx)\n",
+                        eaddr, to_book3s(vcpu)->sdr1, ptegp);
+                for (i = 0; i < 16; i += 2)
+                        dprintk("   %02d: 0x%llx - 0x%llx (0x%llx)\n",
+                                i, pteg[i], pteg[i+1], avpn);
+
+                if (!second) {
+                        second = HPTE_V_SECONDARY;
+                        goto do_second;
+                }
+        }
+
+
+no_page_found:
+
+
+        if (perm_err)
+                return -EPERM;
+
+        return -ENOENT;
+
+no_seg_found:
+
+        dprintk("KVM MMU: Trigger segment fault\n");
+        return -EINVAL;
+}
+
+static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
+{
+        struct kvmppc_vcpu_book3s *vcpu_book3s;
+        u64 esid, esid_1t;
+        int slb_nr;
+        struct kvmppc_slb *slbe;
+
+        dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);
+
+        vcpu_book3s = to_book3s(vcpu);
+
+        esid = GET_ESID(rb);
+        esid_1t = GET_ESID_1T(rb);
+        slb_nr = rb & 0xfff;
+
+        if (slb_nr > vcpu_book3s->slb_nr)
+                return;
+
+        slbe = &vcpu_book3s->slb[slb_nr];
+
+        slbe->large = (rs & SLB_VSID_L) ? 1 : 0;
+        slbe->esid  = slbe->large ? esid_1t : esid;
+        slbe->vsid  = rs >> 12;
+        slbe->valid = (rb & SLB_ESID_V) ? 1 : 0;
+        slbe->Ks    = (rs & SLB_VSID_KS) ? 1 : 0;
+        slbe->Kp    = (rs & SLB_VSID_KP) ? 1 : 0;
+        slbe->nx    = (rs & SLB_VSID_N) ? 1 : 0;
+        slbe->class = (rs & SLB_VSID_C) ? 1 : 0;
+
+        slbe->orige = rb & (ESID_MASK | SLB_ESID_V);
+        slbe->origv = rs;
+
+        /* Map the new segment */
+        kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT);
+}
+
+static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr)
+{
+        struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+        struct kvmppc_slb *slbe;
+
+        if (slb_nr > vcpu_book3s->slb_nr)
+                return 0;
+
+        slbe = &vcpu_book3s->slb[slb_nr];
+
+        return slbe->orige;
+}
+
+static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr)
+{
+        struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+        struct kvmppc_slb *slbe;
+
+        if (slb_nr > vcpu_book3s->slb_nr)
+                return 0;
+
+        slbe = &vcpu_book3s->slb[slb_nr];
+
+        return slbe->origv;
+}
+
+static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea)
+{
+        struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+        struct kvmppc_slb *slbe;
+
+        dprintk("KVM MMU: slbie(0x%llx)\n", ea);
+
+        slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, ea);
+
+        if (!slbe)
+                return;
+
+        dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid);
+
+        slbe->valid = false;
+
+        kvmppc_mmu_map_segment(vcpu, ea);
+}
+
+static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
+{
+        struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+        int i;
+
+        dprintk("KVM MMU: slbia()\n");
+
+        for (i = 1; i < vcpu_book3s->slb_nr; i++)
+                vcpu_book3s->slb[i].valid = false;
+
+        if (vcpu->arch.msr & MSR_IR) {
+                kvmppc_mmu_flush_segments(vcpu);
+                kvmppc_mmu_map_segment(vcpu, vcpu->arch.pc);
+        }
+}
+
+static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
+                                        ulong value)
+{
+        u64 rb = 0, rs = 0;
+
+        /* ESID = srnum */
+        rb |= (srnum & 0xf) << 28;
+        /* Set the valid bit */
+        rb |= 1 << 27;
+        /* Index = ESID */
+        rb |= srnum;
+
+        /* VSID = VSID */
+        rs |= (value & 0xfffffff) << 12;
+        /* flags = flags */
+        rs |= ((value >> 27) & 0xf) << 9;
+
+        kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);
+}
+
+static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,
+                                       bool large)
+{
+        u64 mask = 0xFFFFFFFFFULL;
+
+        dprintk("KVM MMU: tlbie(0x%lx)\n", va);
+
+        if (large)
+                mask = 0xFFFFFF000ULL;
+        kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask);
+}
+
+static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid,
+                                             u64 *vsid)
+{
+        switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) {
+        case 0:
+                *vsid = (VSID_REAL >> 16) | esid;
+                break;
+        case MSR_IR:
+                *vsid = (VSID_REAL_IR >> 16) | esid;
+                break;
+        case MSR_DR:
+                *vsid = (VSID_REAL_DR >> 16) | esid;
+                break;
+        case MSR_DR|MSR_IR:
+        {
+                ulong ea;
+                struct kvmppc_slb *slb;
+                ea = esid << SID_SHIFT;
+                slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea);
+                if (slb)
+                        *vsid = slb->vsid;
+                else
+                        return -ENOENT;
+
+                break;
+        }
+        default:
+                BUG();
+                break;
+        }
+
+        return 0;
+}
+
+static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)
+{
+        return (to_book3s(vcpu)->hid[5] & 0x80);
+}
+
+void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu)
+{
+        struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
+
+        mmu->mfsrin = NULL;
+        mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin;
+        mmu->slbmte = kvmppc_mmu_book3s_64_slbmte;
+        mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee;
+        mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev;
+        mmu->slbie = kvmppc_mmu_book3s_64_slbie;
+        mmu->slbia = kvmppc_mmu_book3s_64_slbia;
+        mmu->xlate = kvmppc_mmu_book3s_64_xlate;
+        mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr;
+        mmu->tlbie = kvmppc_mmu_book3s_64_tlbie;
+        mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid;
+        mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp;
+        mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32;
+}