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415 lines
9.3 KiB
415 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* Copyright SUSE Linux Products GmbH 2009 |
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* |
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* Authors: Alexander Graf <[email protected]> |
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*/ |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/kvm.h> |
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#include <linux/kvm_host.h> |
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#include <linux/highmem.h> |
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#include <asm/kvm_ppc.h> |
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#include <asm/kvm_book3s.h> |
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/* #define DEBUG_MMU */ |
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/* #define DEBUG_MMU_PTE */ |
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/* #define DEBUG_MMU_PTE_IP 0xfff14c40 */ |
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#ifdef DEBUG_MMU |
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#define dprintk(X...) printk(KERN_INFO X) |
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#else |
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#define dprintk(X...) do { } while(0) |
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#endif |
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#ifdef DEBUG_MMU_PTE |
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#define dprintk_pte(X...) printk(KERN_INFO X) |
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#else |
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#define dprintk_pte(X...) do { } while(0) |
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#endif |
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#define PTEG_FLAG_ACCESSED 0x00000100 |
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#define PTEG_FLAG_DIRTY 0x00000080 |
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#ifndef SID_SHIFT |
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#define SID_SHIFT 28 |
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#endif |
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static inline bool check_debug_ip(struct kvm_vcpu *vcpu) |
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{ |
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#ifdef DEBUG_MMU_PTE_IP |
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return vcpu->arch.regs.nip == DEBUG_MMU_PTE_IP; |
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#else |
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return true; |
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#endif |
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} |
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static inline u32 sr_vsid(u32 sr_raw) |
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{ |
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return sr_raw & 0x0fffffff; |
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} |
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static inline bool sr_valid(u32 sr_raw) |
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{ |
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return (sr_raw & 0x80000000) ? false : true; |
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} |
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static inline bool sr_ks(u32 sr_raw) |
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{ |
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return (sr_raw & 0x40000000) ? true: false; |
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} |
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static inline bool sr_kp(u32 sr_raw) |
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{ |
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return (sr_raw & 0x20000000) ? true: false; |
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} |
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static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, |
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struct kvmppc_pte *pte, bool data, |
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bool iswrite); |
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static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, |
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u64 *vsid); |
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static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr) |
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{ |
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return kvmppc_get_sr(vcpu, (eaddr >> 28) & 0xf); |
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} |
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static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, |
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bool data) |
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{ |
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u64 vsid; |
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struct kvmppc_pte pte; |
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if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false)) |
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return pte.vpage; |
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kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); |
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return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); |
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} |
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static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu, |
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u32 sre, gva_t eaddr, |
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bool primary) |
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{ |
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struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); |
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u32 page, hash, pteg, htabmask; |
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hva_t r; |
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page = (eaddr & 0x0FFFFFFF) >> 12; |
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htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; |
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hash = ((sr_vsid(sre) ^ page) << 6); |
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if (!primary) |
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hash = ~hash; |
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hash &= htabmask; |
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pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; |
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dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", |
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kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg, |
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sr_vsid(sre)); |
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r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT); |
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if (kvm_is_error_hva(r)) |
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return r; |
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return r | (pteg & ~PAGE_MASK); |
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} |
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static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary) |
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{ |
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return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) | |
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(primary ? 0 : 0x40) | 0x80000000; |
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} |
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static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, |
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struct kvmppc_pte *pte, bool data, |
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bool iswrite) |
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{ |
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struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); |
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struct kvmppc_bat *bat; |
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int i; |
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for (i = 0; i < 8; i++) { |
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if (data) |
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bat = &vcpu_book3s->dbat[i]; |
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else |
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bat = &vcpu_book3s->ibat[i]; |
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if (kvmppc_get_msr(vcpu) & MSR_PR) { |
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if (!bat->vp) |
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continue; |
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} else { |
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if (!bat->vs) |
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continue; |
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} |
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if (check_debug_ip(vcpu)) |
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{ |
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dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", |
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data ? 'd' : 'i', i, eaddr, bat->bepi, |
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bat->bepi_mask); |
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} |
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if ((eaddr & bat->bepi_mask) == bat->bepi) { |
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u64 vsid; |
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kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, |
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eaddr >> SID_SHIFT, &vsid); |
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vsid <<= 16; |
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pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid; |
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pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); |
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pte->may_read = bat->pp; |
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pte->may_write = bat->pp > 1; |
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pte->may_execute = true; |
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if (!pte->may_read) { |
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printk(KERN_INFO "BAT is not readable!\n"); |
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continue; |
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} |
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if (iswrite && !pte->may_write) { |
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dprintk_pte("BAT is read-only!\n"); |
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continue; |
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} |
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return 0; |
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} |
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} |
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return -ENOENT; |
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} |
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static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, |
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struct kvmppc_pte *pte, bool data, |
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bool iswrite, bool primary) |
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{ |
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u32 sre; |
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hva_t ptegp; |
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u32 pteg[16]; |
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u32 pte0, pte1; |
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u32 ptem = 0; |
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int i; |
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int found = 0; |
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sre = find_sr(vcpu, eaddr); |
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dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, |
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sr_vsid(sre), sre); |
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pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); |
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ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary); |
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if (kvm_is_error_hva(ptegp)) { |
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printk(KERN_INFO "KVM: Invalid PTEG!\n"); |
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goto no_page_found; |
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} |
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ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); |
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if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { |
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printk_ratelimited(KERN_ERR |
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"KVM: Can't copy data from 0x%lx!\n", ptegp); |
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goto no_page_found; |
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} |
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for (i=0; i<16; i+=2) { |
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pte0 = be32_to_cpu(pteg[i]); |
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pte1 = be32_to_cpu(pteg[i + 1]); |
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if (ptem == pte0) { |
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u8 pp; |
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pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF); |
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pp = pte1 & 3; |
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if ((sr_kp(sre) && (kvmppc_get_msr(vcpu) & MSR_PR)) || |
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(sr_ks(sre) && !(kvmppc_get_msr(vcpu) & MSR_PR))) |
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pp |= 4; |
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pte->may_write = false; |
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pte->may_read = false; |
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pte->may_execute = true; |
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switch (pp) { |
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case 0: |
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case 1: |
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case 2: |
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case 6: |
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pte->may_write = true; |
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fallthrough; |
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case 3: |
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case 5: |
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case 7: |
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pte->may_read = true; |
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break; |
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} |
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dprintk_pte("MMU: Found PTE -> %x %x - %x\n", |
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pte0, pte1, pp); |
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found = 1; |
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break; |
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} |
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} |
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/* Update PTE C and A bits, so the guest's swapper knows we used the |
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page */ |
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if (found) { |
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u32 pte_r = pte1; |
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char __user *addr = (char __user *) (ptegp + (i+1) * sizeof(u32)); |
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/* |
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* Use single-byte writes to update the HPTE, to |
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* conform to what real hardware does. |
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*/ |
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if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) { |
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pte_r |= PTEG_FLAG_ACCESSED; |
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put_user(pte_r >> 8, addr + 2); |
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} |
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if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) { |
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pte_r |= PTEG_FLAG_DIRTY; |
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put_user(pte_r, addr + 3); |
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} |
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if (!pte->may_read || (iswrite && !pte->may_write)) |
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return -EPERM; |
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return 0; |
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} |
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no_page_found: |
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if (check_debug_ip(vcpu)) { |
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dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", |
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to_book3s(vcpu)->sdr1, ptegp); |
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for (i=0; i<16; i+=2) { |
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dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n", |
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i, be32_to_cpu(pteg[i]), |
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be32_to_cpu(pteg[i+1]), ptem); |
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} |
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} |
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return -ENOENT; |
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} |
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static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
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struct kvmppc_pte *pte, bool data, |
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bool iswrite) |
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{ |
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int r; |
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ulong mp_ea = vcpu->arch.magic_page_ea; |
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pte->eaddr = eaddr; |
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pte->page_size = MMU_PAGE_4K; |
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/* Magic page override */ |
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if (unlikely(mp_ea) && |
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unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && |
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!(kvmppc_get_msr(vcpu) & MSR_PR)) { |
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pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); |
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pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff); |
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pte->raddr &= KVM_PAM; |
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pte->may_execute = true; |
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pte->may_read = true; |
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pte->may_write = true; |
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return 0; |
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} |
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r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite); |
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if (r < 0) |
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r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, |
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data, iswrite, true); |
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if (r == -ENOENT) |
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r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, |
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data, iswrite, false); |
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return r; |
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} |
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static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) |
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{ |
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return kvmppc_get_sr(vcpu, srnum); |
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} |
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static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, |
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ulong value) |
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{ |
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kvmppc_set_sr(vcpu, srnum, value); |
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kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); |
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} |
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static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) |
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{ |
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int i; |
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struct kvm_vcpu *v; |
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/* flush this VA on all cpus */ |
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kvm_for_each_vcpu(i, v, vcpu->kvm) |
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kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000); |
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} |
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static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, |
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u64 *vsid) |
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{ |
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ulong ea = esid << SID_SHIFT; |
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u32 sr; |
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u64 gvsid = esid; |
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u64 msr = kvmppc_get_msr(vcpu); |
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if (msr & (MSR_DR|MSR_IR)) { |
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sr = find_sr(vcpu, ea); |
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if (sr_valid(sr)) |
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gvsid = sr_vsid(sr); |
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} |
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/* In case we only have one of MSR_IR or MSR_DR set, let's put |
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that in the real-mode context (and hope RM doesn't access |
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high memory) */ |
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switch (msr & (MSR_DR|MSR_IR)) { |
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case 0: |
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*vsid = VSID_REAL | esid; |
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break; |
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case MSR_IR: |
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*vsid = VSID_REAL_IR | gvsid; |
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break; |
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case MSR_DR: |
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*vsid = VSID_REAL_DR | gvsid; |
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break; |
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case MSR_DR|MSR_IR: |
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if (sr_valid(sr)) |
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*vsid = sr_vsid(sr); |
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else |
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*vsid = VSID_BAT | gvsid; |
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break; |
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default: |
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BUG(); |
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} |
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if (msr & MSR_PR) |
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*vsid |= VSID_PR; |
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return 0; |
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} |
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static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) |
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{ |
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return true; |
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} |
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void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) |
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{ |
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struct kvmppc_mmu *mmu = &vcpu->arch.mmu; |
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mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; |
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mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; |
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mmu->xlate = kvmppc_mmu_book3s_32_xlate; |
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mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; |
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mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; |
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mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; |
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mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; |
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mmu->slbmte = NULL; |
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mmu->slbmfee = NULL; |
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mmu->slbmfev = NULL; |
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mmu->slbfee = NULL; |
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mmu->slbie = NULL; |
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mmu->slbia = NULL; |
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}
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