From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/powerpc/kvm/book3s_64_mmu.c | 670 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 670 insertions(+) create mode 100644 arch/powerpc/kvm/book3s_64_mmu.c (limited to 'arch/powerpc/kvm/book3s_64_mmu.c') diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c new file mode 100644 index 000000000..61290282f --- /dev/null +++ b/arch/powerpc/kvm/book3s_64_mmu.c @@ -0,0 +1,670 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Copyright SUSE Linux Products GmbH 2009 + * + * Authors: Alexander Graf + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +/* #define DEBUG_MMU */ + +#ifdef DEBUG_MMU +#define dprintk(X...) printk(KERN_INFO X) +#else +#define dprintk(X...) do { } while(0) +#endif + +static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe( + struct kvm_vcpu *vcpu, + gva_t eaddr) +{ + int i; + u64 esid = GET_ESID(eaddr); + u64 esid_1t = GET_ESID_1T(eaddr); + + for (i = 0; i < vcpu->arch.slb_nr; i++) { + u64 cmp_esid = esid; + + if (!vcpu->arch.slb[i].valid) + continue; + + if (vcpu->arch.slb[i].tb) + cmp_esid = esid_1t; + + if (vcpu->arch.slb[i].esid == cmp_esid) + return &vcpu->arch.slb[i]; + } + + dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n", + eaddr, esid, esid_1t); + for (i = 0; i < vcpu->arch.slb_nr; i++) { + if (vcpu->arch.slb[i].vsid) + dprintk(" %d: %c%c%c %llx %llx\n", i, + vcpu->arch.slb[i].valid ? 'v' : ' ', + vcpu->arch.slb[i].large ? 'l' : ' ', + vcpu->arch.slb[i].tb ? 't' : ' ', + vcpu->arch.slb[i].esid, + vcpu->arch.slb[i].vsid); + } + + return NULL; +} + +static int kvmppc_slb_sid_shift(struct kvmppc_slb *slbe) +{ + return slbe->tb ? SID_SHIFT_1T : SID_SHIFT; +} + +static u64 kvmppc_slb_offset_mask(struct kvmppc_slb *slbe) +{ + return (1ul << kvmppc_slb_sid_shift(slbe)) - 1; +} + +static u64 kvmppc_slb_calc_vpn(struct kvmppc_slb *slb, gva_t eaddr) +{ + eaddr &= kvmppc_slb_offset_mask(slb); + + return (eaddr >> VPN_SHIFT) | + ((slb->vsid) << (kvmppc_slb_sid_shift(slb) - VPN_SHIFT)); +} + +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(vcpu, eaddr); + if (!slb) + return 0; + + return kvmppc_slb_calc_vpn(slb, eaddr); +} + +static int mmu_pagesize(int mmu_pg) +{ + switch (mmu_pg) { + case MMU_PAGE_64K: + return 16; + case MMU_PAGE_16M: + return 24; + } + return 12; +} + +static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe) +{ + return mmu_pagesize(slbe->base_page_size); +} + +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 & kvmppc_slb_offset_mask(slbe)) >> p); +} + +static hva_t kvmppc_mmu_book3s_64_get_pteg(struct kvm_vcpu *vcpu, + struct kvmppc_slb *slbe, gva_t eaddr, + bool second) +{ + struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); + u64 hash, pteg, htabsize; + u32 ssize; + hva_t r; + u64 vpn; + + htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1); + + vpn = kvmppc_slb_calc_vpn(slbe, eaddr); + ssize = slbe->tb ? MMU_SEGSIZE_1T : MMU_SEGSIZE_256M; + hash = hpt_hash(vpn, kvmppc_mmu_book3s_64_get_pagesize(slbe), ssize); + 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); + + /* When running a PAPR guest, SDR1 contains a HVA address instead + of a GPA */ + if (vcpu->arch.papr_enabled) + r = pteg; + else + r = gfn_to_hva(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 << (kvmppc_slb_sid_shift(slbe) - p); + + if (p < 16) + avpn >>= ((80 - p) - 56) - 8; /* 16 - p */ + else + avpn <<= p - 16; + + return avpn; +} + +/* + * Return page size encoded in the second word of a HPTE, or + * -1 for an invalid encoding for the base page size indicated by + * the SLB entry. This doesn't handle mixed pagesize segments yet. + */ +static int decode_pagesize(struct kvmppc_slb *slbe, u64 r) +{ + switch (slbe->base_page_size) { + case MMU_PAGE_64K: + if ((r & 0xf000) == 0x1000) + return MMU_PAGE_64K; + break; + case MMU_PAGE_16M: + if ((r & 0xff000) == 0) + return MMU_PAGE_16M; + break; + } + return -1; +} + +static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, + struct kvmppc_pte *gpte, bool data, + bool iswrite) +{ + struct kvmppc_slb *slbe; + hva_t ptegp; + u64 pteg[16]; + u64 avpn = 0; + u64 r; + u64 v_val, v_mask; + u64 eaddr_mask; + int i; + u8 pp, key = 0; + bool found = false; + bool second = false; + int pgsize; + ulong mp_ea = vcpu->arch.magic_page_ea; + + /* Magic page override */ + if (unlikely(mp_ea) && + unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && + !(kvmppc_get_msr(vcpu) & MSR_PR)) { + gpte->eaddr = eaddr; + gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data); + gpte->raddr = vcpu->arch.magic_page_pa | (gpte->raddr & 0xfff); + gpte->raddr &= KVM_PAM; + gpte->may_execute = true; + gpte->may_read = true; + gpte->may_write = true; + gpte->page_size = MMU_PAGE_4K; + gpte->wimg = HPTE_R_M; + + return 0; + } + + slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu, eaddr); + if (!slbe) + goto no_seg_found; + + avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr); + v_val = avpn & HPTE_V_AVPN; + + if (slbe->tb) + v_val |= SLB_VSID_B_1T; + if (slbe->large) + v_val |= HPTE_V_LARGE; + v_val |= HPTE_V_VALID; + + v_mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_LARGE | HPTE_V_VALID | + HPTE_V_SECONDARY; + + pgsize = slbe->large ? MMU_PAGE_16M : MMU_PAGE_4K; + + mutex_lock(&vcpu->kvm->arch.hpt_mutex); + +do_second: + ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu, slbe, eaddr, second); + if (kvm_is_error_hva(ptegp)) + goto no_page_found; + + if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { + printk_ratelimited(KERN_ERR + "KVM: Can't copy data from 0x%lx!\n", ptegp); + goto no_page_found; + } + + if ((kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Kp) + key = 4; + else if (!(kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Ks) + key = 4; + + for (i=0; i<16; i+=2) { + u64 pte0 = be64_to_cpu(pteg[i]); + u64 pte1 = be64_to_cpu(pteg[i + 1]); + + /* Check all relevant fields of 1st dword */ + if ((pte0 & v_mask) == v_val) { + /* If large page bit is set, check pgsize encoding */ + if (slbe->large && + (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) { + pgsize = decode_pagesize(slbe, pte1); + if (pgsize < 0) + continue; + } + found = true; + break; + } + } + + if (!found) { + if (second) + goto no_page_found; + v_val |= HPTE_V_SECONDARY; + second = true; + goto do_second; + } + + r = be64_to_cpu(pteg[i+1]); + pp = (r & HPTE_R_PP) | key; + if (r & HPTE_R_PP0) + pp |= 8; + + gpte->eaddr = eaddr; + gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data); + + eaddr_mask = (1ull << mmu_pagesize(pgsize)) - 1; + gpte->raddr = (r & HPTE_R_RPN & ~eaddr_mask) | (eaddr & eaddr_mask); + gpte->page_size = pgsize; + gpte->may_execute = ((r & HPTE_R_N) ? false : true); + if (unlikely(vcpu->arch.disable_kernel_nx) && + !(kvmppc_get_msr(vcpu) & MSR_PR)) + gpte->may_execute = true; + gpte->may_read = false; + gpte->may_write = false; + gpte->wimg = r & HPTE_R_WIMG; + + switch (pp) { + case 0: + case 1: + case 2: + case 6: + gpte->may_write = true; + fallthrough; + case 3: + case 5: + case 7: + case 10: + gpte->may_read = true; + break; + } + + dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx " + "-> 0x%lx\n", + eaddr, avpn, gpte->vpage, gpte->raddr); + + /* Update PTE R and C bits, so the guest's swapper knows we used the + * page */ + if (gpte->may_read && !(r & HPTE_R_R)) { + /* + * Set the accessed flag. + * We have to write this back with a single byte write + * because another vcpu may be accessing this on + * non-PAPR platforms such as mac99, and this is + * what real hardware does. + */ + char __user *addr = (char __user *) (ptegp + (i + 1) * sizeof(u64)); + r |= HPTE_R_R; + put_user(r >> 8, addr + 6); + } + if (iswrite && gpte->may_write && !(r & HPTE_R_C)) { + /* Set the dirty flag */ + /* Use a single byte write */ + char __user *addr = (char __user *) (ptegp + (i + 1) * sizeof(u64)); + r |= HPTE_R_C; + put_user(r, addr + 7); + } + + mutex_unlock(&vcpu->kvm->arch.hpt_mutex); + + if (!gpte->may_read || (iswrite && !gpte->may_write)) + return -EPERM; + return 0; + +no_page_found: + mutex_unlock(&vcpu->kvm->arch.hpt_mutex); + 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) +{ + u64 esid, esid_1t; + int slb_nr; + struct kvmppc_slb *slbe; + + dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb); + + esid = GET_ESID(rb); + esid_1t = GET_ESID_1T(rb); + slb_nr = rb & 0xfff; + + if (slb_nr > vcpu->arch.slb_nr) + return; + + slbe = &vcpu->arch.slb[slb_nr]; + + slbe->large = (rs & SLB_VSID_L) ? 1 : 0; + slbe->tb = (rs & SLB_VSID_B_1T) ? 1 : 0; + slbe->esid = slbe->tb ? esid_1t : esid; + slbe->vsid = (rs & ~SLB_VSID_B) >> (kvmppc_slb_sid_shift(slbe) - 16); + 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->base_page_size = MMU_PAGE_4K; + if (slbe->large) { + if (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE) { + switch (rs & SLB_VSID_LP) { + case SLB_VSID_LP_00: + slbe->base_page_size = MMU_PAGE_16M; + break; + case SLB_VSID_LP_01: + slbe->base_page_size = MMU_PAGE_64K; + break; + } + } else + slbe->base_page_size = MMU_PAGE_16M; + } + + slbe->orige = rb & (ESID_MASK | SLB_ESID_V); + slbe->origv = rs; + + /* Map the new segment */ + kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT); +} + +static int kvmppc_mmu_book3s_64_slbfee(struct kvm_vcpu *vcpu, gva_t eaddr, + ulong *ret_slb) +{ + struct kvmppc_slb *slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu, eaddr); + + if (slbe) { + *ret_slb = slbe->origv; + return 0; + } + *ret_slb = 0; + return -ENOENT; +} + +static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr) +{ + struct kvmppc_slb *slbe; + + if (slb_nr > vcpu->arch.slb_nr) + return 0; + + slbe = &vcpu->arch.slb[slb_nr]; + + return slbe->orige; +} + +static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr) +{ + struct kvmppc_slb *slbe; + + if (slb_nr > vcpu->arch.slb_nr) + return 0; + + slbe = &vcpu->arch.slb[slb_nr]; + + return slbe->origv; +} + +static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea) +{ + struct kvmppc_slb *slbe; + u64 seg_size; + + dprintk("KVM MMU: slbie(0x%llx)\n", ea); + + slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea); + + if (!slbe) + return; + + dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid); + + slbe->valid = false; + slbe->orige = 0; + slbe->origv = 0; + + seg_size = 1ull << kvmppc_slb_sid_shift(slbe); + kvmppc_mmu_flush_segment(vcpu, ea & ~(seg_size - 1), seg_size); +} + +static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu) +{ + int i; + + dprintk("KVM MMU: slbia()\n"); + + for (i = 1; i < vcpu->arch.slb_nr; i++) { + vcpu->arch.slb[i].valid = false; + vcpu->arch.slb[i].orige = 0; + vcpu->arch.slb[i].origv = 0; + } + + if (kvmppc_get_msr(vcpu) & MSR_IR) { + kvmppc_mmu_flush_segments(vcpu); + kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)); + } +} + +static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, + ulong value) +{ + u64 rb = 0, rs = 0; + + /* + * According to Book3 2.01 mtsrin is implemented as: + * + * The SLB entry specified by (RB)32:35 is loaded from register + * RS, as follows. + * + * SLBE Bit Source SLB Field + * + * 0:31 0x0000_0000 ESID-0:31 + * 32:35 (RB)32:35 ESID-32:35 + * 36 0b1 V + * 37:61 0x00_0000|| 0b0 VSID-0:24 + * 62:88 (RS)37:63 VSID-25:51 + * 89:91 (RS)33:35 Ks Kp N + * 92 (RS)36 L ((RS)36 must be 0b0) + * 93 0b0 C + */ + + dprintk("KVM MMU: mtsrin(0x%x, 0x%lx)\n", srnum, value); + + /* 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 >> 28) & 0x7) << 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; + unsigned long i; + struct kvm_vcpu *v; + + dprintk("KVM MMU: tlbie(0x%lx)\n", va); + + /* + * The tlbie instruction changed behaviour starting with + * POWER6. POWER6 and later don't have the large page flag + * in the instruction but in the RB value, along with bits + * indicating page and segment sizes. + */ + if (vcpu->arch.hflags & BOOK3S_HFLAG_NEW_TLBIE) { + /* POWER6 or later */ + if (va & 1) { /* L bit */ + if ((va & 0xf000) == 0x1000) + mask = 0xFFFFFFFF0ULL; /* 64k page */ + else + mask = 0xFFFFFF000ULL; /* 16M page */ + } + } else { + /* older processors, e.g. PPC970 */ + if (large) + mask = 0xFFFFFF000ULL; + } + /* flush this VA on all vcpus */ + kvm_for_each_vcpu(i, v, vcpu->kvm) + kvmppc_mmu_pte_vflush(v, va >> 12, mask); +} + +#ifdef CONFIG_PPC_64K_PAGES +static int segment_contains_magic_page(struct kvm_vcpu *vcpu, ulong esid) +{ + ulong mp_ea = vcpu->arch.magic_page_ea; + + return mp_ea && !(kvmppc_get_msr(vcpu) & MSR_PR) && + (mp_ea >> SID_SHIFT) == esid; +} +#endif + +static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, + u64 *vsid) +{ + ulong ea = esid << SID_SHIFT; + struct kvmppc_slb *slb; + u64 gvsid = esid; + ulong mp_ea = vcpu->arch.magic_page_ea; + int pagesize = MMU_PAGE_64K; + u64 msr = kvmppc_get_msr(vcpu); + + if (msr & (MSR_DR|MSR_IR)) { + slb = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea); + if (slb) { + gvsid = slb->vsid; + pagesize = slb->base_page_size; + if (slb->tb) { + gvsid <<= SID_SHIFT_1T - SID_SHIFT; + gvsid |= esid & ((1ul << (SID_SHIFT_1T - SID_SHIFT)) - 1); + gvsid |= VSID_1T; + } + } + } + + switch (msr & (MSR_DR|MSR_IR)) { + case 0: + gvsid = VSID_REAL | esid; + break; + case MSR_IR: + gvsid |= VSID_REAL_IR; + break; + case MSR_DR: + gvsid |= VSID_REAL_DR; + break; + case MSR_DR|MSR_IR: + if (!slb) + goto no_slb; + + break; + default: + BUG(); + break; + } + +#ifdef CONFIG_PPC_64K_PAGES + /* + * Mark this as a 64k segment if the host is using + * 64k pages, the host MMU supports 64k pages and + * the guest segment page size is >= 64k, + * but not if this segment contains the magic page. + */ + if (pagesize >= MMU_PAGE_64K && + mmu_psize_defs[MMU_PAGE_64K].shift && + !segment_contains_magic_page(vcpu, esid)) + gvsid |= VSID_64K; +#endif + + if (kvmppc_get_msr(vcpu) & MSR_PR) + gvsid |= VSID_PR; + + *vsid = gvsid; + return 0; + +no_slb: + /* Catch magic page case */ + if (unlikely(mp_ea) && + unlikely(esid == (mp_ea >> SID_SHIFT)) && + !(kvmppc_get_msr(vcpu) & MSR_PR)) { + *vsid = VSID_REAL | esid; + return 0; + } + + return -EINVAL; +} + +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->slbfee = kvmppc_mmu_book3s_64_slbfee; + mmu->slbie = kvmppc_mmu_book3s_64_slbie; + mmu->slbia = kvmppc_mmu_book3s_64_slbia; + mmu->xlate = kvmppc_mmu_book3s_64_xlate; + 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; + + vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; +} -- cgit v1.2.3