| /* |
| * 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 */ |
| /* #define DEBUG_MMU_PTE */ |
| /* #define DEBUG_MMU_PTE_IP 0xfff14c40 */ |
| |
| #ifdef DEBUG_MMU |
| #define dprintk(X...) printk(KERN_INFO X) |
| #else |
| #define dprintk(X...) do { } while(0) |
| #endif |
| |
| #ifdef DEBUG_MMU_PTE |
| #define dprintk_pte(X...) printk(KERN_INFO X) |
| #else |
| #define dprintk_pte(X...) do { } while(0) |
| #endif |
| |
| #define PTEG_FLAG_ACCESSED 0x00000100 |
| #define PTEG_FLAG_DIRTY 0x00000080 |
| #ifndef SID_SHIFT |
| #define SID_SHIFT 28 |
| #endif |
| |
| static inline bool check_debug_ip(struct kvm_vcpu *vcpu) |
| { |
| #ifdef DEBUG_MMU_PTE_IP |
| return vcpu->arch.pc == DEBUG_MMU_PTE_IP; |
| #else |
| return true; |
| #endif |
| } |
| |
| static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, |
| struct kvmppc_pte *pte, bool data); |
| static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid, |
| u64 *vsid); |
| |
| static struct kvmppc_sr *find_sr(struct kvmppc_vcpu_book3s *vcpu_book3s, gva_t eaddr) |
| { |
| return &vcpu_book3s->sr[(eaddr >> 28) & 0xf]; |
| } |
| |
| static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, |
| bool data) |
| { |
| u64 vsid; |
| struct kvmppc_pte pte; |
| |
| if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data)) |
| return pte.vpage; |
| |
| kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); |
| return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); |
| } |
| |
| static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu) |
| { |
| kvmppc_set_msr(vcpu, 0); |
| } |
| |
| static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s, |
| struct kvmppc_sr *sre, gva_t eaddr, |
| bool primary) |
| { |
| u32 page, hash, pteg, htabmask; |
| hva_t r; |
| |
| page = (eaddr & 0x0FFFFFFF) >> 12; |
| htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; |
| |
| hash = ((sre->vsid ^ page) << 6); |
| if (!primary) |
| hash = ~hash; |
| hash &= htabmask; |
| |
| pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; |
| |
| dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", |
| vcpu_book3s->vcpu.arch.pc, eaddr, vcpu_book3s->sdr1, pteg, |
| sre->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 u32 kvmppc_mmu_book3s_32_get_ptem(struct kvmppc_sr *sre, gva_t eaddr, |
| bool primary) |
| { |
| return ((eaddr & 0x0fffffff) >> 22) | (sre->vsid << 7) | |
| (primary ? 0 : 0x40) | 0x80000000; |
| } |
| |
| static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, |
| struct kvmppc_pte *pte, bool data) |
| { |
| struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); |
| struct kvmppc_bat *bat; |
| int i; |
| |
| for (i = 0; i < 8; i++) { |
| if (data) |
| bat = &vcpu_book3s->dbat[i]; |
| else |
| bat = &vcpu_book3s->ibat[i]; |
| |
| if (vcpu->arch.msr & MSR_PR) { |
| if (!bat->vp) |
| continue; |
| } else { |
| if (!bat->vs) |
| continue; |
| } |
| |
| if (check_debug_ip(vcpu)) |
| { |
| dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", |
| data ? 'd' : 'i', i, eaddr, bat->bepi, |
| bat->bepi_mask); |
| } |
| if ((eaddr & bat->bepi_mask) == bat->bepi) { |
| u64 vsid; |
| kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, |
| eaddr >> SID_SHIFT, &vsid); |
| vsid <<= 16; |
| pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid; |
| |
| pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); |
| pte->may_read = bat->pp; |
| pte->may_write = bat->pp > 1; |
| pte->may_execute = true; |
| if (!pte->may_read) { |
| printk(KERN_INFO "BAT is not readable!\n"); |
| continue; |
| } |
| if (!pte->may_write) { |
| /* let's treat r/o BATs as not-readable for now */ |
| dprintk_pte("BAT is read-only!\n"); |
| continue; |
| } |
| |
| return 0; |
| } |
| } |
| |
| return -ENOENT; |
| } |
| |
| static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, |
| struct kvmppc_pte *pte, bool data, |
| bool primary) |
| { |
| struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); |
| struct kvmppc_sr *sre; |
| hva_t ptegp; |
| u32 pteg[16]; |
| u64 ptem = 0; |
| int i; |
| int found = 0; |
| |
| sre = find_sr(vcpu_book3s, eaddr); |
| |
| dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, |
| sre->vsid, sre->raw); |
| |
| pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); |
| |
| ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary); |
| if (kvm_is_error_hva(ptegp)) { |
| printk(KERN_INFO "KVM: Invalid PTEG!\n"); |
| goto no_page_found; |
| } |
| |
| ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); |
| |
| 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; |
| } |
| |
| for (i=0; i<16; i+=2) { |
| if (ptem == pteg[i]) { |
| u8 pp; |
| |
| pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF); |
| pp = pteg[i+1] & 3; |
| |
| if ((sre->Kp && (vcpu->arch.msr & MSR_PR)) || |
| (sre->Ks && !(vcpu->arch.msr & MSR_PR))) |
| pp |= 4; |
| |
| pte->may_write = false; |
| pte->may_read = false; |
| pte->may_execute = true; |
| switch (pp) { |
| case 0: |
| case 1: |
| case 2: |
| case 6: |
| pte->may_write = true; |
| case 3: |
| case 5: |
| case 7: |
| pte->may_read = true; |
| break; |
| } |
| |
| if ( !pte->may_read ) |
| continue; |
| |
| dprintk_pte("MMU: Found PTE -> %x %x - %x\n", |
| pteg[i], pteg[i+1], pp); |
| found = 1; |
| break; |
| } |
| } |
| |
| /* Update PTE C and A bits, so the guest's swapper knows we used the |
| page */ |
| if (found) { |
| u32 oldpte = pteg[i+1]; |
| |
| if (pte->may_read) |
| pteg[i+1] |= PTEG_FLAG_ACCESSED; |
| if (pte->may_write) |
| pteg[i+1] |= PTEG_FLAG_DIRTY; |
| else |
| dprintk_pte("KVM: Mapping read-only page!\n"); |
| |
| /* Write back into the PTEG */ |
| if (pteg[i+1] != oldpte) |
| copy_to_user((void __user *)ptegp, pteg, sizeof(pteg)); |
| |
| return 0; |
| } |
| |
| no_page_found: |
| |
| if (check_debug_ip(vcpu)) { |
| dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", |
| to_book3s(vcpu)->sdr1, ptegp); |
| for (i=0; i<16; i+=2) { |
| dprintk_pte(" %02d: 0x%x - 0x%x (0x%llx)\n", |
| i, pteg[i], pteg[i+1], ptem); |
| } |
| } |
| |
| return -ENOENT; |
| } |
| |
| static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
| struct kvmppc_pte *pte, bool data) |
| { |
| int r; |
| |
| pte->eaddr = eaddr; |
| r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data); |
| if (r < 0) |
| r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true); |
| if (r < 0) |
| r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false); |
| |
| return r; |
| } |
| |
| |
| static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) |
| { |
| return to_book3s(vcpu)->sr[srnum].raw; |
| } |
| |
| static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, |
| ulong value) |
| { |
| struct kvmppc_sr *sre; |
| |
| sre = &to_book3s(vcpu)->sr[srnum]; |
| |
| /* Flush any left-over shadows from the previous SR */ |
| |
| /* XXX Not necessary? */ |
| /* kvmppc_mmu_pte_flush(vcpu, ((u64)sre->vsid) << 28, 0xf0000000ULL); */ |
| |
| /* And then put in the new SR */ |
| sre->raw = value; |
| sre->vsid = (value & 0x0fffffff); |
| sre->valid = (value & 0x80000000) ? false : true; |
| sre->Ks = (value & 0x40000000) ? true : false; |
| sre->Kp = (value & 0x20000000) ? true : false; |
| sre->nx = (value & 0x10000000) ? true : false; |
| |
| /* Map the new segment */ |
| kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); |
| } |
| |
| static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) |
| { |
| kvmppc_mmu_pte_flush(vcpu, ea, 0x0FFFF000); |
| } |
| |
| static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid, |
| u64 *vsid) |
| { |
| /* In case we only have one of MSR_IR or MSR_DR set, let's put |
| that in the real-mode context (and hope RM doesn't access |
| high memory) */ |
| 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 = esid << SID_SHIFT; |
| struct kvmppc_sr *sr = find_sr(to_book3s(vcpu), ea); |
| |
| if (!sr->valid) |
| return -1; |
| |
| *vsid = sr->vsid; |
| break; |
| } |
| default: |
| BUG(); |
| } |
| |
| if (vcpu->arch.msr & MSR_PR) |
| *vsid |= VSID_PR; |
| |
| return 0; |
| } |
| |
| static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) |
| { |
| return true; |
| } |
| |
| |
| void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) |
| { |
| struct kvmppc_mmu *mmu = &vcpu->arch.mmu; |
| |
| mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; |
| mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; |
| mmu->xlate = kvmppc_mmu_book3s_32_xlate; |
| mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr; |
| mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; |
| mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; |
| mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; |
| mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; |
| |
| mmu->slbmte = NULL; |
| mmu->slbmfee = NULL; |
| mmu->slbmfev = NULL; |
| mmu->slbie = NULL; |
| mmu->slbia = NULL; |
| } |