diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c index 58aa8409dae0..d7889ef3211e 100644 --- a/arch/powerpc/kvm/book3s_64_mmu.c +++ b/arch/powerpc/kvm/book3s_64_mmu.c @@ -163,6 +163,22 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, bool found = false; bool perm_err = false; int second = 0; + ulong mp_ea = vcpu->arch.magic_page_ea; + + /* Magic page override */ + if (unlikely(mp_ea) && + unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && + !(vcpu->arch.shared->msr & 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; + + return 0; + } slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr); if (!slbe) @@ -445,6 +461,7 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, ulong ea = esid << SID_SHIFT; struct kvmppc_slb *slb; u64 gvsid = esid; + ulong mp_ea = vcpu->arch.magic_page_ea; if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) { slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea); @@ -464,7 +481,7 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, break; case MSR_DR|MSR_IR: if (!slb) - return -ENOENT; + goto no_slb; *vsid = gvsid; break; @@ -477,6 +494,17 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, *vsid |= VSID_PR; return 0; + +no_slb: + /* Catch magic page case */ + if (unlikely(mp_ea) && + unlikely(esid == (mp_ea >> SID_SHIFT)) && + !(vcpu->arch.shared->msr & MSR_PR)) { + *vsid = VSID_REAL | esid; + return 0; + } + + return -EINVAL; } static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu) |