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https://github.com/torvalds/linux
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46808a4cb8
Everywhere we use kvm_for_each_vpcu(), we use an int as the vcpu index. Unfortunately, we're about to move rework the iterator, which requires this to be upgrade to an unsigned long. Let's bite the bullet and repaint all of it in one go. Signed-off-by: Marc Zyngier <maz@kernel.org> Message-Id: <20211116160403.4074052-7-maz@kernel.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
416 lines
9.3 KiB
C
416 lines
9.3 KiB
C
// 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 <agraf@suse.de>
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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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unsigned long 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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