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_32_mmu.c | 415 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 415 insertions(+) create mode 100644 arch/powerpc/kvm/book3s_32_mmu.c (limited to 'arch/powerpc/kvm/book3s_32_mmu.c') diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c new file mode 100644 index 000000000..0215f3293 --- /dev/null +++ b/arch/powerpc/kvm/book3s_32_mmu.c @@ -0,0 +1,415 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Copyright SUSE Linux Products GmbH 2009 + * + * Authors: Alexander Graf + */ + +#include +#include +#include +#include +#include + +#include +#include + +/* #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.regs.nip == DEBUG_MMU_PTE_IP; +#else + return true; +#endif +} + +static inline u32 sr_vsid(u32 sr_raw) +{ + return sr_raw & 0x0fffffff; +} + +static inline bool sr_valid(u32 sr_raw) +{ + return (sr_raw & 0x80000000) ? false : true; +} + +static inline bool sr_ks(u32 sr_raw) +{ + return (sr_raw & 0x40000000) ? true: false; +} + +static inline bool sr_kp(u32 sr_raw) +{ + return (sr_raw & 0x20000000) ? true: false; +} + +static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, + struct kvmppc_pte *pte, bool data, + bool iswrite); +static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, + u64 *vsid); + +static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr) +{ + return kvmppc_get_sr(vcpu, (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, false)) + return pte.vpage; + + kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); + return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); +} + +static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu, + u32 sre, gva_t eaddr, + bool primary) +{ + struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); + u32 page, hash, pteg, htabmask; + hva_t r; + + page = (eaddr & 0x0FFFFFFF) >> 12; + htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; + + hash = ((sr_vsid(sre) ^ 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", + kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg, + sr_vsid(sre)); + + r = gfn_to_hva(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(u32 sre, gva_t eaddr, bool primary) +{ + return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 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, + bool iswrite) +{ + 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 (kvmppc_get_msr(vcpu) & 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 (iswrite && !pte->may_write) { + 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 iswrite, bool primary) +{ + u32 sre; + hva_t ptegp; + u32 pteg[16]; + u32 pte0, pte1; + u32 ptem = 0; + int i; + int found = 0; + + sre = find_sr(vcpu, eaddr); + + dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, + sr_vsid(sre), sre); + + pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); + + ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, 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_ratelimited(KERN_ERR + "KVM: Can't copy data from 0x%lx!\n", ptegp); + goto no_page_found; + } + + for (i=0; i<16; i+=2) { + pte0 = be32_to_cpu(pteg[i]); + pte1 = be32_to_cpu(pteg[i + 1]); + if (ptem == pte0) { + u8 pp; + + pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF); + pp = pte1 & 3; + + if ((sr_kp(sre) && (kvmppc_get_msr(vcpu) & MSR_PR)) || + (sr_ks(sre) && !(kvmppc_get_msr(vcpu) & 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; + fallthrough; + case 3: + case 5: + case 7: + pte->may_read = true; + break; + } + + dprintk_pte("MMU: Found PTE -> %x %x - %x\n", + pte0, pte1, pp); + found = 1; + break; + } + } + + /* Update PTE C and A bits, so the guest's swapper knows we used the + page */ + if (found) { + u32 pte_r = pte1; + char __user *addr = (char __user *) (ptegp + (i+1) * sizeof(u32)); + + /* + * Use single-byte writes to update the HPTE, to + * conform to what real hardware does. + */ + if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) { + pte_r |= PTEG_FLAG_ACCESSED; + put_user(pte_r >> 8, addr + 2); + } + if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) { + pte_r |= PTEG_FLAG_DIRTY; + put_user(pte_r, addr + 3); + } + if (!pte->may_read || (iswrite && !pte->may_write)) + return -EPERM; + 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%x)\n", + i, be32_to_cpu(pteg[i]), + be32_to_cpu(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, + bool iswrite) +{ + int r; + ulong mp_ea = vcpu->arch.magic_page_ea; + + pte->eaddr = eaddr; + pte->page_size = MMU_PAGE_4K; + + /* Magic page override */ + if (unlikely(mp_ea) && + unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && + !(kvmppc_get_msr(vcpu) & MSR_PR)) { + pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); + pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff); + pte->raddr &= KVM_PAM; + pte->may_execute = true; + pte->may_read = true; + pte->may_write = true; + + return 0; + } + + r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite); + if (r < 0) + r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, + data, iswrite, true); + if (r == -ENOENT) + r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, + data, iswrite, false); + + return r; +} + + +static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) +{ + return kvmppc_get_sr(vcpu, srnum); +} + +static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, + ulong value) +{ + kvmppc_set_sr(vcpu, srnum, value); + kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); +} + +static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) +{ + unsigned long i; + struct kvm_vcpu *v; + + /* flush this VA on all cpus */ + kvm_for_each_vcpu(i, v, vcpu->kvm) + kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000); +} + +static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, + u64 *vsid) +{ + ulong ea = esid << SID_SHIFT; + u32 sr; + u64 gvsid = esid; + u64 msr = kvmppc_get_msr(vcpu); + + if (msr & (MSR_DR|MSR_IR)) { + sr = find_sr(vcpu, ea); + if (sr_valid(sr)) + gvsid = sr_vsid(sr); + } + + /* 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 (msr & (MSR_DR|MSR_IR)) { + case 0: + *vsid = VSID_REAL | esid; + break; + case MSR_IR: + *vsid = VSID_REAL_IR | gvsid; + break; + case MSR_DR: + *vsid = VSID_REAL_DR | gvsid; + break; + case MSR_DR|MSR_IR: + if (sr_valid(sr)) + *vsid = sr_vsid(sr); + else + *vsid = VSID_BAT | gvsid; + break; + default: + BUG(); + } + + if (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->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->slbfee = NULL; + mmu->slbie = NULL; + mmu->slbia = NULL; +} -- cgit v1.2.3