diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_pr_papr.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_pr_papr.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c new file mode 100644 index 0000000..b958932 --- /dev/null +++ b/arch/powerpc/kvm/book3s_pr_papr.c @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2011. Freescale Inc. All rights reserved. + * + * Authors: + * Alexander Graf <agraf@suse.de> + * Paul Mackerras <paulus@samba.org> + * + * Description: + * + * Hypercall handling for running PAPR guests in PR KVM on Book 3S + * processors. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + */ + +#include <asm/uaccess.h> +#include <asm/kvm_ppc.h> +#include <asm/kvm_book3s.h> + +static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index) +{ + struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); + unsigned long pteg_addr; + + pte_index <<= 4; + pte_index &= ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1) << 7 | 0x70; + pteg_addr = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL; + pteg_addr |= pte_index; + + return pteg_addr; +} + +static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu) +{ + long flags = kvmppc_get_gpr(vcpu, 4); + long pte_index = kvmppc_get_gpr(vcpu, 5); + unsigned long pteg[2 * 8]; + unsigned long pteg_addr, i, *hpte; + + pte_index &= ~7UL; + pteg_addr = get_pteg_addr(vcpu, pte_index); + + copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg)); + hpte = pteg; + + if (likely((flags & H_EXACT) == 0)) { + pte_index &= ~7UL; + for (i = 0; ; ++i) { + if (i == 8) + return H_PTEG_FULL; + if ((*hpte & HPTE_V_VALID) == 0) + break; + hpte += 2; + } + } else { + i = kvmppc_get_gpr(vcpu, 5) & 7UL; + hpte += i * 2; + } + + hpte[0] = kvmppc_get_gpr(vcpu, 6); + hpte[1] = kvmppc_get_gpr(vcpu, 7); + copy_to_user((void __user *)pteg_addr, pteg, sizeof(pteg)); + kvmppc_set_gpr(vcpu, 3, H_SUCCESS); + kvmppc_set_gpr(vcpu, 4, pte_index | i); + + return EMULATE_DONE; +} + +static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu) +{ + unsigned long flags= kvmppc_get_gpr(vcpu, 4); + unsigned long pte_index = kvmppc_get_gpr(vcpu, 5); + unsigned long avpn = kvmppc_get_gpr(vcpu, 6); + unsigned long v = 0, pteg, rb; + unsigned long pte[2]; + + pteg = get_pteg_addr(vcpu, pte_index); + copy_from_user(pte, (void __user *)pteg, sizeof(pte)); + + if ((pte[0] & HPTE_V_VALID) == 0 || + ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) || + ((flags & H_ANDCOND) && (pte[0] & avpn) != 0)) { + kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND); + return EMULATE_DONE; + } + + copy_to_user((void __user *)pteg, &v, sizeof(v)); + + rb = compute_tlbie_rb(pte[0], pte[1], pte_index); + vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false); + + kvmppc_set_gpr(vcpu, 3, H_SUCCESS); + kvmppc_set_gpr(vcpu, 4, pte[0]); + kvmppc_set_gpr(vcpu, 5, pte[1]); + + return EMULATE_DONE; +} + +static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu) +{ + unsigned long flags = kvmppc_get_gpr(vcpu, 4); + unsigned long pte_index = kvmppc_get_gpr(vcpu, 5); + unsigned long avpn = kvmppc_get_gpr(vcpu, 6); + unsigned long rb, pteg, r, v; + unsigned long pte[2]; + + pteg = get_pteg_addr(vcpu, pte_index); + copy_from_user(pte, (void __user *)pteg, sizeof(pte)); + + if ((pte[0] & HPTE_V_VALID) == 0 || + ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn)) { + kvmppc_set_gpr(vcpu, 3, H_NOT_FOUND); + return EMULATE_DONE; + } + + v = pte[0]; + r = pte[1]; + r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_HI | + HPTE_R_KEY_LO); + r |= (flags << 55) & HPTE_R_PP0; + r |= (flags << 48) & HPTE_R_KEY_HI; + r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); + + pte[1] = r; + + rb = compute_tlbie_rb(v, r, pte_index); + vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false); + copy_to_user((void __user *)pteg, pte, sizeof(pte)); + + kvmppc_set_gpr(vcpu, 3, H_SUCCESS); + + return EMULATE_DONE; +} + +int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd) +{ + switch (cmd) { + case H_ENTER: + return kvmppc_h_pr_enter(vcpu); + case H_REMOVE: + return kvmppc_h_pr_remove(vcpu); + case H_PROTECT: + return kvmppc_h_pr_protect(vcpu); + case H_BULK_REMOVE: + /* We just flush all PTEs, so user space can + handle the HPT modifications */ + kvmppc_mmu_pte_flush(vcpu, 0, 0); + break; + case H_CEDE: + kvm_vcpu_block(vcpu); + vcpu->stat.halt_wakeup++; + return EMULATE_DONE; + } + + return EMULATE_FAIL; +} |