diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_pr_papr.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_pr_papr.c | 496 |
1 files changed, 496 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 000000000..b2c89e850 --- /dev/null +++ b/arch/powerpc/kvm/book3s_pr_papr.c @@ -0,0 +1,496 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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. + */ + +#include <linux/anon_inodes.h> + +#include <linux/uaccess.h> +#include <asm/kvm_ppc.h> +#include <asm/kvm_book3s.h> + +#define HPTE_SIZE 16 /* bytes per HPT entry */ + +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); + __be64 pteg[2 * 8]; + __be64 *hpte; + unsigned long pteg_addr, i; + long int ret; + + i = pte_index & 7; + pte_index &= ~7UL; + pteg_addr = get_pteg_addr(vcpu, pte_index); + + mutex_lock(&vcpu->kvm->arch.hpt_mutex); + ret = H_FUNCTION; + if (copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg))) + goto done; + hpte = pteg; + + ret = H_PTEG_FULL; + if (likely((flags & H_EXACT) == 0)) { + for (i = 0; ; ++i) { + if (i == 8) + goto done; + if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0) + break; + hpte += 2; + } + } else { + hpte += i * 2; + if (*hpte & HPTE_V_VALID) + goto done; + } + + hpte[0] = cpu_to_be64(kvmppc_get_gpr(vcpu, 6)); + hpte[1] = cpu_to_be64(kvmppc_get_gpr(vcpu, 7)); + pteg_addr += i * HPTE_SIZE; + ret = H_FUNCTION; + if (copy_to_user((void __user *)pteg_addr, hpte, HPTE_SIZE)) + goto done; + kvmppc_set_gpr(vcpu, 4, pte_index | i); + ret = H_SUCCESS; + + done: + mutex_unlock(&vcpu->kvm->arch.hpt_mutex); + kvmppc_set_gpr(vcpu, 3, ret); + + 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]; + long int ret; + + pteg = get_pteg_addr(vcpu, pte_index); + mutex_lock(&vcpu->kvm->arch.hpt_mutex); + ret = H_FUNCTION; + if (copy_from_user(pte, (void __user *)pteg, sizeof(pte))) + goto done; + pte[0] = be64_to_cpu((__force __be64)pte[0]); + pte[1] = be64_to_cpu((__force __be64)pte[1]); + + ret = H_NOT_FOUND; + if ((pte[0] & HPTE_V_VALID) == 0 || + ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) || + ((flags & H_ANDCOND) && (pte[0] & avpn) != 0)) + goto done; + + ret = H_FUNCTION; + if (copy_to_user((void __user *)pteg, &v, sizeof(v))) + goto done; + + rb = compute_tlbie_rb(pte[0], pte[1], pte_index); + vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false); + + ret = H_SUCCESS; + kvmppc_set_gpr(vcpu, 4, pte[0]); + kvmppc_set_gpr(vcpu, 5, pte[1]); + + done: + mutex_unlock(&vcpu->kvm->arch.hpt_mutex); + kvmppc_set_gpr(vcpu, 3, ret); + + return EMULATE_DONE; +} + +/* Request defs for kvmppc_h_pr_bulk_remove() */ +#define H_BULK_REMOVE_TYPE 0xc000000000000000ULL +#define H_BULK_REMOVE_REQUEST 0x4000000000000000ULL +#define H_BULK_REMOVE_RESPONSE 0x8000000000000000ULL +#define H_BULK_REMOVE_END 0xc000000000000000ULL +#define H_BULK_REMOVE_CODE 0x3000000000000000ULL +#define H_BULK_REMOVE_SUCCESS 0x0000000000000000ULL +#define H_BULK_REMOVE_NOT_FOUND 0x1000000000000000ULL +#define H_BULK_REMOVE_PARM 0x2000000000000000ULL +#define H_BULK_REMOVE_HW 0x3000000000000000ULL +#define H_BULK_REMOVE_RC 0x0c00000000000000ULL +#define H_BULK_REMOVE_FLAGS 0x0300000000000000ULL +#define H_BULK_REMOVE_ABSOLUTE 0x0000000000000000ULL +#define H_BULK_REMOVE_ANDCOND 0x0100000000000000ULL +#define H_BULK_REMOVE_AVPN 0x0200000000000000ULL +#define H_BULK_REMOVE_PTEX 0x00ffffffffffffffULL +#define H_BULK_REMOVE_MAX_BATCH 4 + +static int kvmppc_h_pr_bulk_remove(struct kvm_vcpu *vcpu) +{ + int i; + int paramnr = 4; + int ret = H_SUCCESS; + + mutex_lock(&vcpu->kvm->arch.hpt_mutex); + for (i = 0; i < H_BULK_REMOVE_MAX_BATCH; i++) { + unsigned long tsh = kvmppc_get_gpr(vcpu, paramnr+(2*i)); + unsigned long tsl = kvmppc_get_gpr(vcpu, paramnr+(2*i)+1); + unsigned long pteg, rb, flags; + unsigned long pte[2]; + unsigned long v = 0; + + if ((tsh & H_BULK_REMOVE_TYPE) == H_BULK_REMOVE_END) { + break; /* Exit success */ + } else if ((tsh & H_BULK_REMOVE_TYPE) != + H_BULK_REMOVE_REQUEST) { + ret = H_PARAMETER; + break; /* Exit fail */ + } + + tsh &= H_BULK_REMOVE_PTEX | H_BULK_REMOVE_FLAGS; + tsh |= H_BULK_REMOVE_RESPONSE; + + if ((tsh & H_BULK_REMOVE_ANDCOND) && + (tsh & H_BULK_REMOVE_AVPN)) { + tsh |= H_BULK_REMOVE_PARM; + kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh); + ret = H_PARAMETER; + break; /* Exit fail */ + } + + pteg = get_pteg_addr(vcpu, tsh & H_BULK_REMOVE_PTEX); + if (copy_from_user(pte, (void __user *)pteg, sizeof(pte))) { + ret = H_FUNCTION; + break; + } + pte[0] = be64_to_cpu((__force __be64)pte[0]); + pte[1] = be64_to_cpu((__force __be64)pte[1]); + + /* tsl = AVPN */ + flags = (tsh & H_BULK_REMOVE_FLAGS) >> 26; + + if ((pte[0] & HPTE_V_VALID) == 0 || + ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != tsl) || + ((flags & H_ANDCOND) && (pte[0] & tsl) != 0)) { + tsh |= H_BULK_REMOVE_NOT_FOUND; + } else { + /* Splat the pteg in (userland) hpt */ + if (copy_to_user((void __user *)pteg, &v, sizeof(v))) { + ret = H_FUNCTION; + break; + } + + rb = compute_tlbie_rb(pte[0], pte[1], + tsh & H_BULK_REMOVE_PTEX); + vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false); + tsh |= H_BULK_REMOVE_SUCCESS; + tsh |= (pte[1] & (HPTE_R_C | HPTE_R_R)) << 43; + } + kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh); + } + mutex_unlock(&vcpu->kvm->arch.hpt_mutex); + kvmppc_set_gpr(vcpu, 3, ret); + + 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]; + long int ret; + + pteg = get_pteg_addr(vcpu, pte_index); + mutex_lock(&vcpu->kvm->arch.hpt_mutex); + ret = H_FUNCTION; + if (copy_from_user(pte, (void __user *)pteg, sizeof(pte))) + goto done; + pte[0] = be64_to_cpu((__force __be64)pte[0]); + pte[1] = be64_to_cpu((__force __be64)pte[1]); + + ret = H_NOT_FOUND; + if ((pte[0] & HPTE_V_VALID) == 0 || + ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn)) + goto 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); + pte[0] = (__force u64)cpu_to_be64(pte[0]); + pte[1] = (__force u64)cpu_to_be64(pte[1]); + ret = H_FUNCTION; + if (copy_to_user((void __user *)pteg, pte, sizeof(pte))) + goto done; + ret = H_SUCCESS; + + done: + mutex_unlock(&vcpu->kvm->arch.hpt_mutex); + kvmppc_set_gpr(vcpu, 3, ret); + + return EMULATE_DONE; +} + +static int kvmppc_h_pr_logical_ci_load(struct kvm_vcpu *vcpu) +{ + long rc; + + rc = kvmppc_h_logical_ci_load(vcpu); + if (rc == H_TOO_HARD) + return EMULATE_FAIL; + kvmppc_set_gpr(vcpu, 3, rc); + return EMULATE_DONE; +} + +static int kvmppc_h_pr_logical_ci_store(struct kvm_vcpu *vcpu) +{ + long rc; + + rc = kvmppc_h_logical_ci_store(vcpu); + if (rc == H_TOO_HARD) + return EMULATE_FAIL; + kvmppc_set_gpr(vcpu, 3, rc); + return EMULATE_DONE; +} + +static int kvmppc_h_pr_set_mode(struct kvm_vcpu *vcpu) +{ + unsigned long mflags = kvmppc_get_gpr(vcpu, 4); + unsigned long resource = kvmppc_get_gpr(vcpu, 5); + + if (resource == H_SET_MODE_RESOURCE_ADDR_TRANS_MODE) { + /* KVM PR does not provide AIL!=0 to guests */ + if (mflags == 0) + kvmppc_set_gpr(vcpu, 3, H_SUCCESS); + else + kvmppc_set_gpr(vcpu, 3, H_UNSUPPORTED_FLAG_START - 63); + return EMULATE_DONE; + } + return EMULATE_FAIL; +} + +#ifdef CONFIG_SPAPR_TCE_IOMMU +static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu) +{ + unsigned long liobn = kvmppc_get_gpr(vcpu, 4); + unsigned long ioba = kvmppc_get_gpr(vcpu, 5); + unsigned long tce = kvmppc_get_gpr(vcpu, 6); + long rc; + + rc = kvmppc_h_put_tce(vcpu, liobn, ioba, tce); + if (rc == H_TOO_HARD) + return EMULATE_FAIL; + kvmppc_set_gpr(vcpu, 3, rc); + return EMULATE_DONE; +} + +static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu) +{ + unsigned long liobn = kvmppc_get_gpr(vcpu, 4); + unsigned long ioba = kvmppc_get_gpr(vcpu, 5); + unsigned long tce = kvmppc_get_gpr(vcpu, 6); + unsigned long npages = kvmppc_get_gpr(vcpu, 7); + long rc; + + rc = kvmppc_h_put_tce_indirect(vcpu, liobn, ioba, + tce, npages); + if (rc == H_TOO_HARD) + return EMULATE_FAIL; + kvmppc_set_gpr(vcpu, 3, rc); + return EMULATE_DONE; +} + +static int kvmppc_h_pr_stuff_tce(struct kvm_vcpu *vcpu) +{ + unsigned long liobn = kvmppc_get_gpr(vcpu, 4); + unsigned long ioba = kvmppc_get_gpr(vcpu, 5); + unsigned long tce_value = kvmppc_get_gpr(vcpu, 6); + unsigned long npages = kvmppc_get_gpr(vcpu, 7); + long rc; + + rc = kvmppc_h_stuff_tce(vcpu, liobn, ioba, tce_value, npages); + if (rc == H_TOO_HARD) + return EMULATE_FAIL; + kvmppc_set_gpr(vcpu, 3, rc); + return EMULATE_DONE; +} + +#else /* CONFIG_SPAPR_TCE_IOMMU */ +static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu) +{ + return EMULATE_FAIL; +} + +static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu) +{ + return EMULATE_FAIL; +} + +static int kvmppc_h_pr_stuff_tce(struct kvm_vcpu *vcpu) +{ + return EMULATE_FAIL; +} +#endif /* CONFIG_SPAPR_TCE_IOMMU */ + +static int kvmppc_h_pr_xics_hcall(struct kvm_vcpu *vcpu, u32 cmd) +{ + long rc = kvmppc_xics_hcall(vcpu, cmd); + kvmppc_set_gpr(vcpu, 3, rc); + return EMULATE_DONE; +} + +int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd) +{ + int rc, idx; + + if (cmd <= MAX_HCALL_OPCODE && + !test_bit(cmd/4, vcpu->kvm->arch.enabled_hcalls)) + return EMULATE_FAIL; + + 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: + return kvmppc_h_pr_bulk_remove(vcpu); + case H_PUT_TCE: + return kvmppc_h_pr_put_tce(vcpu); + case H_PUT_TCE_INDIRECT: + return kvmppc_h_pr_put_tce_indirect(vcpu); + case H_STUFF_TCE: + return kvmppc_h_pr_stuff_tce(vcpu); + case H_CEDE: + kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE); + kvm_vcpu_halt(vcpu); + vcpu->stat.generic.halt_wakeup++; + return EMULATE_DONE; + case H_LOGICAL_CI_LOAD: + return kvmppc_h_pr_logical_ci_load(vcpu); + case H_LOGICAL_CI_STORE: + return kvmppc_h_pr_logical_ci_store(vcpu); + case H_SET_MODE: + return kvmppc_h_pr_set_mode(vcpu); + case H_XIRR: + case H_CPPR: + case H_EOI: + case H_IPI: + case H_IPOLL: + case H_XIRR_X: + if (kvmppc_xics_enabled(vcpu)) + return kvmppc_h_pr_xics_hcall(vcpu, cmd); + break; + case H_RTAS: + if (list_empty(&vcpu->kvm->arch.rtas_tokens)) + break; + idx = srcu_read_lock(&vcpu->kvm->srcu); + rc = kvmppc_rtas_hcall(vcpu); + srcu_read_unlock(&vcpu->kvm->srcu, idx); + if (rc) + break; + kvmppc_set_gpr(vcpu, 3, 0); + return EMULATE_DONE; + } + + return EMULATE_FAIL; +} + +int kvmppc_hcall_impl_pr(unsigned long cmd) +{ + switch (cmd) { + case H_ENTER: + case H_REMOVE: + case H_PROTECT: + case H_BULK_REMOVE: +#ifdef CONFIG_SPAPR_TCE_IOMMU + case H_GET_TCE: + case H_PUT_TCE: + case H_PUT_TCE_INDIRECT: + case H_STUFF_TCE: +#endif + case H_CEDE: + case H_LOGICAL_CI_LOAD: + case H_LOGICAL_CI_STORE: + case H_SET_MODE: +#ifdef CONFIG_KVM_XICS + case H_XIRR: + case H_CPPR: + case H_EOI: + case H_IPI: + case H_IPOLL: + case H_XIRR_X: +#endif + return 1; + } + return 0; +} + +/* + * List of hcall numbers to enable by default. + * For compatibility with old userspace, we enable by default + * all hcalls that were implemented before the hcall-enabling + * facility was added. Note this list should not include H_RTAS. + */ +static unsigned int default_hcall_list[] = { + H_ENTER, + H_REMOVE, + H_PROTECT, + H_BULK_REMOVE, +#ifdef CONFIG_SPAPR_TCE_IOMMU + H_GET_TCE, + H_PUT_TCE, +#endif + H_CEDE, + H_SET_MODE, +#ifdef CONFIG_KVM_XICS + H_XIRR, + H_CPPR, + H_EOI, + H_IPI, + H_IPOLL, + H_XIRR_X, +#endif + 0 +}; + +void kvmppc_pr_init_default_hcalls(struct kvm *kvm) +{ + int i; + unsigned int hcall; + + for (i = 0; default_hcall_list[i]; ++i) { + hcall = default_hcall_list[i]; + WARN_ON(!kvmppc_hcall_impl_pr(hcall)); + __set_bit(hcall / 4, kvm->arch.enabled_hcalls); + } +} |