// SPDX-License-Identifier: GPL-2.0 /* * kvm nested virtualization support for s390x * * Copyright IBM Corp. 2016, 2018 * * Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com> */ #include <linux/vmalloc.h> #include <linux/kvm_host.h> #include <linux/bug.h> #include <linux/list.h> #include <linux/bitmap.h> #include <linux/sched/signal.h> #include <asm/gmap.h> #include <asm/mmu_context.h> #include <asm/sclp.h> #include <asm/nmi.h> #include <asm/dis.h> #include "kvm-s390.h" #include "gaccess.h" struct vsie_page { <------>struct kvm_s390_sie_block scb_s; /* 0x0000 */ <------>/* <------> * the backup info for machine check. ensure it's at <------> * the same offset as that in struct sie_page! <------> */ <------>struct mcck_volatile_info mcck_info; /* 0x0200 */ <------>/* <------> * The pinned original scb. Be aware that other VCPUs can modify <------> * it while we read from it. Values that are used for conditions or <------> * are reused conditionally, should be accessed via READ_ONCE. <------> */ <------>struct kvm_s390_sie_block *scb_o; /* 0x0218 */ <------>/* the shadow gmap in use by the vsie_page */ <------>struct gmap *gmap; /* 0x0220 */ <------>/* address of the last reported fault to guest2 */ <------>unsigned long fault_addr; /* 0x0228 */ <------>/* calculated guest addresses of satellite control blocks */ <------>gpa_t sca_gpa; /* 0x0230 */ <------>gpa_t itdba_gpa; /* 0x0238 */ <------>gpa_t gvrd_gpa; /* 0x0240 */ <------>gpa_t riccbd_gpa; /* 0x0248 */ <------>gpa_t sdnx_gpa; /* 0x0250 */ <------>__u8 reserved[0x0700 - 0x0258]; /* 0x0258 */ <------>struct kvm_s390_crypto_cb crycb; /* 0x0700 */ <------>__u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE]; /* 0x0800 */ }; /* trigger a validity icpt for the given scb */ static int set_validity_icpt(struct kvm_s390_sie_block *scb, <------><------><------> __u16 reason_code) { <------>scb->ipa = 0x1000; <------>scb->ipb = ((__u32) reason_code) << 16; <------>scb->icptcode = ICPT_VALIDITY; <------>return 1; } /* mark the prefix as unmapped, this will block the VSIE */ static void prefix_unmapped(struct vsie_page *vsie_page) { <------>atomic_or(PROG_REQUEST, &vsie_page->scb_s.prog20); } /* mark the prefix as unmapped and wait until the VSIE has been left */ static void prefix_unmapped_sync(struct vsie_page *vsie_page) { <------>prefix_unmapped(vsie_page); <------>if (vsie_page->scb_s.prog0c & PROG_IN_SIE) <------><------>atomic_or(CPUSTAT_STOP_INT, &vsie_page->scb_s.cpuflags); <------>while (vsie_page->scb_s.prog0c & PROG_IN_SIE) <------><------>cpu_relax(); } /* mark the prefix as mapped, this will allow the VSIE to run */ static void prefix_mapped(struct vsie_page *vsie_page) { <------>atomic_andnot(PROG_REQUEST, &vsie_page->scb_s.prog20); } /* test if the prefix is mapped into the gmap shadow */ static int prefix_is_mapped(struct vsie_page *vsie_page) { <------>return !(atomic_read(&vsie_page->scb_s.prog20) & PROG_REQUEST); } /* copy the updated intervention request bits into the shadow scb */ static void update_intervention_requests(struct vsie_page *vsie_page) { <------>const int bits = CPUSTAT_STOP_INT | CPUSTAT_IO_INT | CPUSTAT_EXT_INT; <------>int cpuflags; <------>cpuflags = atomic_read(&vsie_page->scb_o->cpuflags); <------>atomic_andnot(bits, &vsie_page->scb_s.cpuflags); <------>atomic_or(cpuflags & bits, &vsie_page->scb_s.cpuflags); } /* shadow (filter and validate) the cpuflags */ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; <------>int newflags, cpuflags = atomic_read(&scb_o->cpuflags); <------>/* we don't allow ESA/390 guests */ <------>if (!(cpuflags & CPUSTAT_ZARCH)) <------><------>return set_validity_icpt(scb_s, 0x0001U); <------>if (cpuflags & (CPUSTAT_RRF | CPUSTAT_MCDS)) <------><------>return set_validity_icpt(scb_s, 0x0001U); <------>else if (cpuflags & (CPUSTAT_SLSV | CPUSTAT_SLSR)) <------><------>return set_validity_icpt(scb_s, 0x0007U); <------>/* intervention requests will be set later */ <------>newflags = CPUSTAT_ZARCH; <------>if (cpuflags & CPUSTAT_GED && test_kvm_facility(vcpu->kvm, 8)) <------><------>newflags |= CPUSTAT_GED; <------>if (cpuflags & CPUSTAT_GED2 && test_kvm_facility(vcpu->kvm, 78)) { <------><------>if (cpuflags & CPUSTAT_GED) <------><------><------>return set_validity_icpt(scb_s, 0x0001U); <------><------>newflags |= CPUSTAT_GED2; <------>} <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE)) <------><------>newflags |= cpuflags & CPUSTAT_P; <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS)) <------><------>newflags |= cpuflags & CPUSTAT_SM; <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS)) <------><------>newflags |= cpuflags & CPUSTAT_IBS; <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_KSS)) <------><------>newflags |= cpuflags & CPUSTAT_KSS; <------>atomic_set(&scb_s->cpuflags, newflags); <------>return 0; } /* Copy to APCB FORMAT1 from APCB FORMAT0 */ static int setup_apcb10(struct kvm_vcpu *vcpu, struct kvm_s390_apcb1 *apcb_s, <------><------><------>unsigned long apcb_o, struct kvm_s390_apcb1 *apcb_h) { <------>struct kvm_s390_apcb0 tmp; <------>if (read_guest_real(vcpu, apcb_o, &tmp, sizeof(struct kvm_s390_apcb0))) <------><------>return -EFAULT; <------>apcb_s->apm[0] = apcb_h->apm[0] & tmp.apm[0]; <------>apcb_s->aqm[0] = apcb_h->aqm[0] & tmp.aqm[0] & 0xffff000000000000UL; <------>apcb_s->adm[0] = apcb_h->adm[0] & tmp.adm[0] & 0xffff000000000000UL; <------>return 0; } /** * setup_apcb00 - Copy to APCB FORMAT0 from APCB FORMAT0 * @vcpu: pointer to the virtual CPU * @apcb_s: pointer to start of apcb in the shadow crycb * @apcb_o: pointer to start of original apcb in the guest2 * @apcb_h: pointer to start of apcb in the guest1 * * Returns 0 and -EFAULT on error reading guest apcb */ static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s, <------><------><------>unsigned long apcb_o, unsigned long *apcb_h) { <------>if (read_guest_real(vcpu, apcb_o, apcb_s, <------><------><------> sizeof(struct kvm_s390_apcb0))) <------><------>return -EFAULT; <------>bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb0)); <------>return 0; } /** * setup_apcb11 - Copy the FORMAT1 APCB from the guest to the shadow CRYCB * @vcpu: pointer to the virtual CPU * @apcb_s: pointer to start of apcb in the shadow crycb * @apcb_o: pointer to start of original guest apcb * @apcb_h: pointer to start of apcb in the host * * Returns 0 and -EFAULT on error reading guest apcb */ static int setup_apcb11(struct kvm_vcpu *vcpu, unsigned long *apcb_s, <------><------><------>unsigned long apcb_o, <------><------><------>unsigned long *apcb_h) { <------>if (read_guest_real(vcpu, apcb_o, apcb_s, <------><------><------> sizeof(struct kvm_s390_apcb1))) <------><------>return -EFAULT; <------>bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb1)); <------>return 0; } /** * setup_apcb - Create a shadow copy of the apcb. * @vcpu: pointer to the virtual CPU * @crycb_s: pointer to shadow crycb * @crycb_o: pointer to original guest crycb * @crycb_h: pointer to the host crycb * @fmt_o: format of the original guest crycb. * @fmt_h: format of the host crycb. * * Checks the compatibility between the guest and host crycb and calls the * appropriate copy function. * * Return 0 or an error number if the guest and host crycb are incompatible. */ static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s, <------> const u32 crycb_o, <------> struct kvm_s390_crypto_cb *crycb_h, <------> int fmt_o, int fmt_h) { <------>struct kvm_s390_crypto_cb *crycb; <------>crycb = (struct kvm_s390_crypto_cb *) (unsigned long)crycb_o; <------>switch (fmt_o) { <------>case CRYCB_FORMAT2: <------><------>if ((crycb_o & PAGE_MASK) != ((crycb_o + 256) & PAGE_MASK)) <------><------><------>return -EACCES; <------><------>if (fmt_h != CRYCB_FORMAT2) <------><------><------>return -EINVAL; <------><------>return setup_apcb11(vcpu, (unsigned long *)&crycb_s->apcb1, <------><------><------><------> (unsigned long) &crycb->apcb1, <------><------><------><------> (unsigned long *)&crycb_h->apcb1); <------>case CRYCB_FORMAT1: <------><------>switch (fmt_h) { <------><------>case CRYCB_FORMAT2: <------><------><------>return setup_apcb10(vcpu, &crycb_s->apcb1, <------><------><------><------><------> (unsigned long) &crycb->apcb0, <------><------><------><------><------> &crycb_h->apcb1); <------><------>case CRYCB_FORMAT1: <------><------><------>return setup_apcb00(vcpu, <------><------><------><------><------> (unsigned long *) &crycb_s->apcb0, <------><------><------><------><------> (unsigned long) &crycb->apcb0, <------><------><------><------><------> (unsigned long *) &crycb_h->apcb0); <------><------>} <------><------>break; <------>case CRYCB_FORMAT0: <------><------>if ((crycb_o & PAGE_MASK) != ((crycb_o + 32) & PAGE_MASK)) <------><------><------>return -EACCES; <------><------>switch (fmt_h) { <------><------>case CRYCB_FORMAT2: <------><------><------>return setup_apcb10(vcpu, &crycb_s->apcb1, <------><------><------><------><------> (unsigned long) &crycb->apcb0, <------><------><------><------><------> &crycb_h->apcb1); <------><------>case CRYCB_FORMAT1: <------><------>case CRYCB_FORMAT0: <------><------><------>return setup_apcb00(vcpu, <------><------><------><------><------> (unsigned long *) &crycb_s->apcb0, <------><------><------><------><------> (unsigned long) &crycb->apcb0, <------><------><------><------><------> (unsigned long *) &crycb_h->apcb0); <------><------>} <------>} <------>return -EINVAL; } /** * shadow_crycb - Create a shadow copy of the crycb block * @vcpu: a pointer to the virtual CPU * @vsie_page: a pointer to internal date used for the vSIE * * Create a shadow copy of the crycb block and setup key wrapping, if * requested for guest 3 and enabled for guest 2. * * We accept format-1 or format-2, but we convert format-1 into format-2 * in the shadow CRYCB. * Using format-2 enables the firmware to choose the right format when * scheduling the SIE. * There is nothing to do for format-0. * * This function centralize the issuing of set_validity_icpt() for all * the subfunctions working on the crycb. * * Returns: - 0 if shadowed or nothing to do * - > 0 if control has to be given to guest 2 */ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; <------>const uint32_t crycbd_o = READ_ONCE(scb_o->crycbd); <------>const u32 crycb_addr = crycbd_o & 0x7ffffff8U; <------>unsigned long *b1, *b2; <------>u8 ecb3_flags; <------>u32 ecd_flags; <------>int apie_h; <------>int apie_s; <------>int key_msk = test_kvm_facility(vcpu->kvm, 76); <------>int fmt_o = crycbd_o & CRYCB_FORMAT_MASK; <------>int fmt_h = vcpu->arch.sie_block->crycbd & CRYCB_FORMAT_MASK; <------>int ret = 0; <------>scb_s->crycbd = 0; <------>apie_h = vcpu->arch.sie_block->eca & ECA_APIE; <------>apie_s = apie_h & scb_o->eca; <------>if (!apie_s && (!key_msk || (fmt_o == CRYCB_FORMAT0))) <------><------>return 0; <------>if (!crycb_addr) <------><------>return set_validity_icpt(scb_s, 0x0039U); <------>if (fmt_o == CRYCB_FORMAT1) <------><------>if ((crycb_addr & PAGE_MASK) != <------><------> ((crycb_addr + 128) & PAGE_MASK)) <------><------><------>return set_validity_icpt(scb_s, 0x003CU); <------>if (apie_s) { <------><------>ret = setup_apcb(vcpu, &vsie_page->crycb, crycb_addr, <------><------><------><------> vcpu->kvm->arch.crypto.crycb, <------><------><------><------> fmt_o, fmt_h); <------><------>if (ret) <------><------><------>goto end; <------><------>scb_s->eca |= scb_o->eca & ECA_APIE; <------>} <------>/* we may only allow it if enabled for guest 2 */ <------>ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 & <------><------> (ECB3_AES | ECB3_DEA); <------>ecd_flags = scb_o->ecd & vcpu->arch.sie_block->ecd & ECD_ECC; <------>if (!ecb3_flags && !ecd_flags) <------><------>goto end; <------>/* copy only the wrapping keys */ <------>if (read_guest_real(vcpu, crycb_addr + 72, <------><------><------> vsie_page->crycb.dea_wrapping_key_mask, 56)) <------><------>return set_validity_icpt(scb_s, 0x0035U); <------>scb_s->ecb3 |= ecb3_flags; <------>scb_s->ecd |= ecd_flags; <------>/* xor both blocks in one run */ <------>b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask; <------>b2 = (unsigned long *) <------><------><------> vcpu->kvm->arch.crypto.crycb->dea_wrapping_key_mask; <------>/* as 56%8 == 0, bitmap_xor won't overwrite any data */ <------>bitmap_xor(b1, b1, b2, BITS_PER_BYTE * 56); end: <------>switch (ret) { <------>case -EINVAL: <------><------>return set_validity_icpt(scb_s, 0x0022U); <------>case -EFAULT: <------><------>return set_validity_icpt(scb_s, 0x0035U); <------>case -EACCES: <------><------>return set_validity_icpt(scb_s, 0x003CU); <------>} <------>scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT2; <------>return 0; } /* shadow (round up/down) the ibc to avoid validity icpt */ static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; <------>/* READ_ONCE does not work on bitfields - use a temporary variable */ <------>const uint32_t __new_ibc = scb_o->ibc; <------>const uint32_t new_ibc = READ_ONCE(__new_ibc) & 0x0fffU; <------>__u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU; <------>scb_s->ibc = 0; <------>/* ibc installed in g2 and requested for g3 */ <------>if (vcpu->kvm->arch.model.ibc && new_ibc) { <------><------>scb_s->ibc = new_ibc; <------><------>/* takte care of the minimum ibc level of the machine */ <------><------>if (scb_s->ibc < min_ibc) <------><------><------>scb_s->ibc = min_ibc; <------><------>/* take care of the maximum ibc level set for the guest */ <------><------>if (scb_s->ibc > vcpu->kvm->arch.model.ibc) <------><------><------>scb_s->ibc = vcpu->kvm->arch.model.ibc; <------>} } /* unshadow the scb, copying parameters back to the real scb */ static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; <------>/* interception */ <------>scb_o->icptcode = scb_s->icptcode; <------>scb_o->icptstatus = scb_s->icptstatus; <------>scb_o->ipa = scb_s->ipa; <------>scb_o->ipb = scb_s->ipb; <------>scb_o->gbea = scb_s->gbea; <------>/* timer */ <------>scb_o->cputm = scb_s->cputm; <------>scb_o->ckc = scb_s->ckc; <------>scb_o->todpr = scb_s->todpr; <------>/* guest state */ <------>scb_o->gpsw = scb_s->gpsw; <------>scb_o->gg14 = scb_s->gg14; <------>scb_o->gg15 = scb_s->gg15; <------>memcpy(scb_o->gcr, scb_s->gcr, 128); <------>scb_o->pp = scb_s->pp; <------>/* branch prediction */ <------>if (test_kvm_facility(vcpu->kvm, 82)) { <------><------>scb_o->fpf &= ~FPF_BPBC; <------><------>scb_o->fpf |= scb_s->fpf & FPF_BPBC; <------>} <------>/* interrupt intercept */ <------>switch (scb_s->icptcode) { <------>case ICPT_PROGI: <------>case ICPT_INSTPROGI: <------>case ICPT_EXTINT: <------><------>memcpy((void *)((u64)scb_o + 0xc0), <------><------> (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0); <------><------>break; <------>} <------>if (scb_s->ihcpu != 0xffffU) <------><------>scb_o->ihcpu = scb_s->ihcpu; } /* * Setup the shadow scb by copying and checking the relevant parts of the g2 * provided scb. * * Returns: - 0 if the scb has been shadowed * - > 0 if control has to be given to guest 2 */ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>/* READ_ONCE does not work on bitfields - use a temporary variable */ <------>const uint32_t __new_prefix = scb_o->prefix; <------>const uint32_t new_prefix = READ_ONCE(__new_prefix); <------>const bool wants_tx = READ_ONCE(scb_o->ecb) & ECB_TE; <------>bool had_tx = scb_s->ecb & ECB_TE; <------>unsigned long new_mso = 0; <------>int rc; <------>/* make sure we don't have any leftovers when reusing the scb */ <------>scb_s->icptcode = 0; <------>scb_s->eca = 0; <------>scb_s->ecb = 0; <------>scb_s->ecb2 = 0; <------>scb_s->ecb3 = 0; <------>scb_s->ecd = 0; <------>scb_s->fac = 0; <------>scb_s->fpf = 0; <------>rc = prepare_cpuflags(vcpu, vsie_page); <------>if (rc) <------><------>goto out; <------>/* timer */ <------>scb_s->cputm = scb_o->cputm; <------>scb_s->ckc = scb_o->ckc; <------>scb_s->todpr = scb_o->todpr; <------>scb_s->epoch = scb_o->epoch; <------>/* guest state */ <------>scb_s->gpsw = scb_o->gpsw; <------>scb_s->gg14 = scb_o->gg14; <------>scb_s->gg15 = scb_o->gg15; <------>memcpy(scb_s->gcr, scb_o->gcr, 128); <------>scb_s->pp = scb_o->pp; <------>/* interception / execution handling */ <------>scb_s->gbea = scb_o->gbea; <------>scb_s->lctl = scb_o->lctl; <------>scb_s->svcc = scb_o->svcc; <------>scb_s->ictl = scb_o->ictl; <------>/* <------> * SKEY handling functions can't deal with false setting of PTE invalid <------> * bits. Therefore we cannot provide interpretation and would later <------> * have to provide own emulation handlers. <------> */ <------>if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_KSS)) <------><------>scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; <------>scb_s->icpua = scb_o->icpua; <------>if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM)) <------><------>new_mso = READ_ONCE(scb_o->mso) & 0xfffffffffff00000UL; <------>/* if the hva of the prefix changes, we have to remap the prefix */ <------>if (scb_s->mso != new_mso || scb_s->prefix != new_prefix) <------><------>prefix_unmapped(vsie_page); <------> /* SIE will do mso/msl validity and exception checks for us */ <------>scb_s->msl = scb_o->msl & 0xfffffffffff00000UL; <------>scb_s->mso = new_mso; <------>scb_s->prefix = new_prefix; <------>/* We have to definetly flush the tlb if this scb never ran */ <------>if (scb_s->ihcpu != 0xffffU) <------><------>scb_s->ihcpu = scb_o->ihcpu; <------>/* MVPG and Protection Exception Interpretation are always available */ <------>scb_s->eca |= scb_o->eca & (ECA_MVPGI | ECA_PROTEXCI); <------>/* Host-protection-interruption introduced with ESOP */ <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP)) <------><------>scb_s->ecb |= scb_o->ecb & ECB_HOSTPROTINT; <------>/* transactional execution */ <------>if (test_kvm_facility(vcpu->kvm, 73) && wants_tx) { <------><------>/* remap the prefix is tx is toggled on */ <------><------>if (!had_tx) <------><------><------>prefix_unmapped(vsie_page); <------><------>scb_s->ecb |= ECB_TE; <------>} <------>/* branch prediction */ <------>if (test_kvm_facility(vcpu->kvm, 82)) <------><------>scb_s->fpf |= scb_o->fpf & FPF_BPBC; <------>/* SIMD */ <------>if (test_kvm_facility(vcpu->kvm, 129)) { <------><------>scb_s->eca |= scb_o->eca & ECA_VX; <------><------>scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; <------>} <------>/* Run-time-Instrumentation */ <------>if (test_kvm_facility(vcpu->kvm, 64)) <------><------>scb_s->ecb3 |= scb_o->ecb3 & ECB3_RI; <------>/* Instruction Execution Prevention */ <------>if (test_kvm_facility(vcpu->kvm, 130)) <------><------>scb_s->ecb2 |= scb_o->ecb2 & ECB2_IEP; <------>/* Guarded Storage */ <------>if (test_kvm_facility(vcpu->kvm, 133)) { <------><------>scb_s->ecb |= scb_o->ecb & ECB_GS; <------><------>scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; <------>} <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF)) <------><------>scb_s->eca |= scb_o->eca & ECA_SII; <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB)) <------><------>scb_s->eca |= scb_o->eca & ECA_IB; <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI)) <------><------>scb_s->eca |= scb_o->eca & ECA_CEI; <------>/* Epoch Extension */ <------>if (test_kvm_facility(vcpu->kvm, 139)) <------><------>scb_s->ecd |= scb_o->ecd & ECD_MEF; <------>/* etoken */ <------>if (test_kvm_facility(vcpu->kvm, 156)) <------><------>scb_s->ecd |= scb_o->ecd & ECD_ETOKENF; <------>scb_s->hpid = HPID_VSIE; <------>scb_s->cpnc = scb_o->cpnc; <------>prepare_ibc(vcpu, vsie_page); <------>rc = shadow_crycb(vcpu, vsie_page); out: <------>if (rc) <------><------>unshadow_scb(vcpu, vsie_page); <------>return rc; } void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start, <------><------><------><------> unsigned long end) { <------>struct kvm *kvm = gmap->private; <------>struct vsie_page *cur; <------>unsigned long prefix; <------>struct page *page; <------>int i; <------>if (!gmap_is_shadow(gmap)) <------><------>return; <------>if (start >= 1UL << 31) <------><------>/* We are only interested in prefix pages */ <------><------>return; <------>/* <------> * Only new shadow blocks are added to the list during runtime, <------> * therefore we can safely reference them all the time. <------> */ <------>for (i = 0; i < kvm->arch.vsie.page_count; i++) { <------><------>page = READ_ONCE(kvm->arch.vsie.pages[i]); <------><------>if (!page) <------><------><------>continue; <------><------>cur = page_to_virt(page); <------><------>if (READ_ONCE(cur->gmap) != gmap) <------><------><------>continue; <------><------>prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT; <------><------>/* with mso/msl, the prefix lies at an offset */ <------><------>prefix += cur->scb_s.mso; <------><------>if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1) <------><------><------>prefix_unmapped_sync(cur); <------>} } /* * Map the first prefix page and if tx is enabled also the second prefix page. * * The prefix will be protected, a gmap notifier will inform about unmaps. * The shadow scb must not be executed until the prefix is remapped, this is * guaranteed by properly handling PROG_REQUEST. * * Returns: - 0 on if successfully mapped or already mapped * - > 0 if control has to be given to guest 2 * - -EAGAIN if the caller can retry immediately * - -ENOMEM if out of memory */ static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>u64 prefix = scb_s->prefix << GUEST_PREFIX_SHIFT; <------>int rc; <------>if (prefix_is_mapped(vsie_page)) <------><------>return 0; <------>/* mark it as mapped so we can catch any concurrent unmappers */ <------>prefix_mapped(vsie_page); <------>/* with mso/msl, the prefix lies at offset *mso* */ <------>prefix += scb_s->mso; <------>rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix, NULL); <------>if (!rc && (scb_s->ecb & ECB_TE)) <------><------>rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, <------><------><------><------><------> prefix + PAGE_SIZE, NULL); <------>/* <------> * We don't have to mprotect, we will be called for all unshadows. <------> * SIE will detect if protection applies and trigger a validity. <------> */ <------>if (rc) <------><------>prefix_unmapped(vsie_page); <------>if (rc > 0 || rc == -EFAULT) <------><------>rc = set_validity_icpt(scb_s, 0x0037U); <------>return rc; } /* * Pin the guest page given by gpa and set hpa to the pinned host address. * Will always be pinned writable. * * Returns: - 0 on success * - -EINVAL if the gpa is not valid guest storage */ static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa) { <------>struct page *page; <------>page = gfn_to_page(kvm, gpa_to_gfn(gpa)); <------>if (is_error_page(page)) <------><------>return -EINVAL; <------>*hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK); <------>return 0; } /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */ static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa) { <------>kvm_release_pfn_dirty(hpa >> PAGE_SHIFT); <------>/* mark the page always as dirty for migration */ <------>mark_page_dirty(kvm, gpa_to_gfn(gpa)); } /* unpin all blocks previously pinned by pin_blocks(), marking them dirty */ static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>hpa_t hpa; <------>hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol; <------>if (hpa) { <------><------>unpin_guest_page(vcpu->kvm, vsie_page->sca_gpa, hpa); <------><------>vsie_page->sca_gpa = 0; <------><------>scb_s->scaol = 0; <------><------>scb_s->scaoh = 0; <------>} <------>hpa = scb_s->itdba; <------>if (hpa) { <------><------>unpin_guest_page(vcpu->kvm, vsie_page->itdba_gpa, hpa); <------><------>vsie_page->itdba_gpa = 0; <------><------>scb_s->itdba = 0; <------>} <------>hpa = scb_s->gvrd; <------>if (hpa) { <------><------>unpin_guest_page(vcpu->kvm, vsie_page->gvrd_gpa, hpa); <------><------>vsie_page->gvrd_gpa = 0; <------><------>scb_s->gvrd = 0; <------>} <------>hpa = scb_s->riccbd; <------>if (hpa) { <------><------>unpin_guest_page(vcpu->kvm, vsie_page->riccbd_gpa, hpa); <------><------>vsie_page->riccbd_gpa = 0; <------><------>scb_s->riccbd = 0; <------>} <------>hpa = scb_s->sdnxo; <------>if (hpa) { <------><------>unpin_guest_page(vcpu->kvm, vsie_page->sdnx_gpa, hpa); <------><------>vsie_page->sdnx_gpa = 0; <------><------>scb_s->sdnxo = 0; <------>} } /* * Instead of shadowing some blocks, we can simply forward them because the * addresses in the scb are 64 bit long. * * This works as long as the data lies in one page. If blocks ever exceed one * page, we have to fall back to shadowing. * * As we reuse the sca, the vcpu pointers contained in it are invalid. We must * therefore not enable any facilities that access these pointers (e.g. SIGPIF). * * Returns: - 0 if all blocks were pinned. * - > 0 if control has to be given to guest 2 * - -ENOMEM if out of memory */ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>hpa_t hpa; <------>gpa_t gpa; <------>int rc = 0; <------>gpa = READ_ONCE(scb_o->scaol) & ~0xfUL; <------>if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO)) <------><------>gpa |= (u64) READ_ONCE(scb_o->scaoh) << 32; <------>if (gpa) { <------><------>if (gpa < 2 * PAGE_SIZE) <------><------><------>rc = set_validity_icpt(scb_s, 0x0038U); <------><------>else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu)) <------><------><------>rc = set_validity_icpt(scb_s, 0x0011U); <------><------>else if ((gpa & PAGE_MASK) != <------><------><------> ((gpa + sizeof(struct bsca_block) - 1) & PAGE_MASK)) <------><------><------>rc = set_validity_icpt(scb_s, 0x003bU); <------><------>if (!rc) { <------><------><------>rc = pin_guest_page(vcpu->kvm, gpa, &hpa); <------><------><------>if (rc) <------><------><------><------>rc = set_validity_icpt(scb_s, 0x0034U); <------><------>} <------><------>if (rc) <------><------><------>goto unpin; <------><------>vsie_page->sca_gpa = gpa; <------><------>scb_s->scaoh = (u32)((u64)hpa >> 32); <------><------>scb_s->scaol = (u32)(u64)hpa; <------>} <------>gpa = READ_ONCE(scb_o->itdba) & ~0xffUL; <------>if (gpa && (scb_s->ecb & ECB_TE)) { <------><------>if (gpa < 2 * PAGE_SIZE) { <------><------><------>rc = set_validity_icpt(scb_s, 0x0080U); <------><------><------>goto unpin; <------><------>} <------><------>/* 256 bytes cannot cross page boundaries */ <------><------>rc = pin_guest_page(vcpu->kvm, gpa, &hpa); <------><------>if (rc) { <------><------><------>rc = set_validity_icpt(scb_s, 0x0080U); <------><------><------>goto unpin; <------><------>} <------><------>vsie_page->itdba_gpa = gpa; <------><------>scb_s->itdba = hpa; <------>} <------>gpa = READ_ONCE(scb_o->gvrd) & ~0x1ffUL; <------>if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) { <------><------>if (gpa < 2 * PAGE_SIZE) { <------><------><------>rc = set_validity_icpt(scb_s, 0x1310U); <------><------><------>goto unpin; <------><------>} <------><------>/* <------><------> * 512 bytes vector registers cannot cross page boundaries <------><------> * if this block gets bigger, we have to shadow it. <------><------> */ <------><------>rc = pin_guest_page(vcpu->kvm, gpa, &hpa); <------><------>if (rc) { <------><------><------>rc = set_validity_icpt(scb_s, 0x1310U); <------><------><------>goto unpin; <------><------>} <------><------>vsie_page->gvrd_gpa = gpa; <------><------>scb_s->gvrd = hpa; <------>} <------>gpa = READ_ONCE(scb_o->riccbd) & ~0x3fUL; <------>if (gpa && (scb_s->ecb3 & ECB3_RI)) { <------><------>if (gpa < 2 * PAGE_SIZE) { <------><------><------>rc = set_validity_icpt(scb_s, 0x0043U); <------><------><------>goto unpin; <------><------>} <------><------>/* 64 bytes cannot cross page boundaries */ <------><------>rc = pin_guest_page(vcpu->kvm, gpa, &hpa); <------><------>if (rc) { <------><------><------>rc = set_validity_icpt(scb_s, 0x0043U); <------><------><------>goto unpin; <------><------>} <------><------>/* Validity 0x0044 will be checked by SIE */ <------><------>vsie_page->riccbd_gpa = gpa; <------><------>scb_s->riccbd = hpa; <------>} <------>if (((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) || <------> (scb_s->ecd & ECD_ETOKENF)) { <------><------>unsigned long sdnxc; <------><------>gpa = READ_ONCE(scb_o->sdnxo) & ~0xfUL; <------><------>sdnxc = READ_ONCE(scb_o->sdnxo) & 0xfUL; <------><------>if (!gpa || gpa < 2 * PAGE_SIZE) { <------><------><------>rc = set_validity_icpt(scb_s, 0x10b0U); <------><------><------>goto unpin; <------><------>} <------><------>if (sdnxc < 6 || sdnxc > 12) { <------><------><------>rc = set_validity_icpt(scb_s, 0x10b1U); <------><------><------>goto unpin; <------><------>} <------><------>if (gpa & ((1 << sdnxc) - 1)) { <------><------><------>rc = set_validity_icpt(scb_s, 0x10b2U); <------><------><------>goto unpin; <------><------>} <------><------>/* Due to alignment rules (checked above) this cannot <------><------> * cross page boundaries <------><------> */ <------><------>rc = pin_guest_page(vcpu->kvm, gpa, &hpa); <------><------>if (rc) { <------><------><------>rc = set_validity_icpt(scb_s, 0x10b0U); <------><------><------>goto unpin; <------><------>} <------><------>vsie_page->sdnx_gpa = gpa; <------><------>scb_s->sdnxo = hpa | sdnxc; <------>} <------>return 0; unpin: <------>unpin_blocks(vcpu, vsie_page); <------>return rc; } /* unpin the scb provided by guest 2, marking it as dirty */ static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, <------><------> gpa_t gpa) { <------>hpa_t hpa = (hpa_t) vsie_page->scb_o; <------>if (hpa) <------><------>unpin_guest_page(vcpu->kvm, gpa, hpa); <------>vsie_page->scb_o = NULL; } /* * Pin the scb at gpa provided by guest 2 at vsie_page->scb_o. * * Returns: - 0 if the scb was pinned. * - > 0 if control has to be given to guest 2 */ static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, <------><------> gpa_t gpa) { <------>hpa_t hpa; <------>int rc; <------>rc = pin_guest_page(vcpu->kvm, gpa, &hpa); <------>if (rc) { <------><------>rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); <------><------>WARN_ON_ONCE(rc); <------><------>return 1; <------>} <------>vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa; <------>return 0; } /* * Inject a fault into guest 2. * * Returns: - > 0 if control has to be given to guest 2 * < 0 if an error occurred during injection. */ static int inject_fault(struct kvm_vcpu *vcpu, __u16 code, __u64 vaddr, <------><------><------>bool write_flag) { <------>struct kvm_s390_pgm_info pgm = { <------><------>.code = code, <------><------>.trans_exc_code = <------><------><------>/* 0-51: virtual address */ <------><------><------>(vaddr & 0xfffffffffffff000UL) | <------><------><------>/* 52-53: store / fetch */ <------><------><------>(((unsigned int) !write_flag) + 1) << 10, <------><------><------>/* 62-63: asce id (alway primary == 0) */ <------><------>.exc_access_id = 0, /* always primary */ <------><------>.op_access_id = 0, /* not MVPG */ <------>}; <------>int rc; <------>if (code == PGM_PROTECTION) <------><------>pgm.trans_exc_code |= 0x4UL; <------>rc = kvm_s390_inject_prog_irq(vcpu, &pgm); <------>return rc ? rc : 1; } /* * Handle a fault during vsie execution on a gmap shadow. * * Returns: - 0 if the fault was resolved * - > 0 if control has to be given to guest 2 * - < 0 if an error occurred */ static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>int rc; <------>if (current->thread.gmap_int_code == PGM_PROTECTION) <------><------>/* we can directly forward all protection exceptions */ <------><------>return inject_fault(vcpu, PGM_PROTECTION, <------><------><------><------> current->thread.gmap_addr, 1); <------>rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, <------><------><------><------> current->thread.gmap_addr, NULL); <------>if (rc > 0) { <------><------>rc = inject_fault(vcpu, rc, <------><------><------><------> current->thread.gmap_addr, <------><------><------><------> current->thread.gmap_write_flag); <------><------>if (rc >= 0) <------><------><------>vsie_page->fault_addr = current->thread.gmap_addr; <------>} <------>return rc; } /* * Retry the previous fault that required guest 2 intervention. This avoids * one superfluous SIE re-entry and direct exit. * * Will ignore any errors. The next SIE fault will do proper fault handling. */ static void handle_last_fault(struct kvm_vcpu *vcpu, <------><------><------> struct vsie_page *vsie_page) { <------>if (vsie_page->fault_addr) <------><------>kvm_s390_shadow_fault(vcpu, vsie_page->gmap, <------><------><------><------> vsie_page->fault_addr, NULL); <------>vsie_page->fault_addr = 0; } static inline void clear_vsie_icpt(struct vsie_page *vsie_page) { <------>vsie_page->scb_s.icptcode = 0; } /* rewind the psw and clear the vsie icpt, so we can retry execution */ static void retry_vsie_icpt(struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>int ilen = insn_length(scb_s->ipa >> 8); <------>/* take care of EXECUTE instructions */ <------>if (scb_s->icptstatus & 1) { <------><------>ilen = (scb_s->icptstatus >> 4) & 0x6; <------><------>if (!ilen) <------><------><------>ilen = 4; <------>} <------>scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, ilen); <------>clear_vsie_icpt(vsie_page); } /* * Try to shadow + enable the guest 2 provided facility list. * Retry instruction execution if enabled for and provided by guest 2. * * Returns: - 0 if handled (retry or guest 2 icpt) * - > 0 if control has to be given to guest 2 */ static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>__u32 fac = READ_ONCE(vsie_page->scb_o->fac) & 0x7ffffff8U; <------>if (fac && test_kvm_facility(vcpu->kvm, 7)) { <------><------>retry_vsie_icpt(vsie_page); <------><------>if (read_guest_real(vcpu, fac, &vsie_page->fac, <------><------><------><------> sizeof(vsie_page->fac))) <------><------><------>return set_validity_icpt(scb_s, 0x1090U); <------><------>scb_s->fac = (__u32)(__u64) &vsie_page->fac; <------>} <------>return 0; } /* * Get a register for a nested guest. * @vcpu the vcpu of the guest * @vsie_page the vsie_page for the nested guest * @reg the register number, the upper 4 bits are ignored. * returns: the value of the register. */ static u64 vsie_get_register(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, u8 reg) { <------>/* no need to validate the parameter and/or perform error handling */ <------>reg &= 0xf; <------>switch (reg) { <------>case 15: <------><------>return vsie_page->scb_s.gg15; <------>case 14: <------><------>return vsie_page->scb_s.gg14; <------>default: <------><------>return vcpu->run->s.regs.gprs[reg]; <------>} } static int vsie_handle_mvpg(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>unsigned long pei_dest, pei_src, src, dest, mask, prefix; <------>u64 *pei_block = &vsie_page->scb_o->mcic; <------>int edat, rc_dest, rc_src; <------>union ctlreg0 cr0; <------>cr0.val = vcpu->arch.sie_block->gcr[0]; <------>edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8); <------>mask = _kvm_s390_logical_to_effective(&scb_s->gpsw, PAGE_MASK); <------>prefix = scb_s->prefix << GUEST_PREFIX_SHIFT; <------>dest = vsie_get_register(vcpu, vsie_page, scb_s->ipb >> 20) & mask; <------>dest = _kvm_s390_real_to_abs(prefix, dest) + scb_s->mso; <------>src = vsie_get_register(vcpu, vsie_page, scb_s->ipb >> 16) & mask; <------>src = _kvm_s390_real_to_abs(prefix, src) + scb_s->mso; <------>rc_dest = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, dest, &pei_dest); <------>rc_src = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, src, &pei_src); <------>/* <------> * Either everything went well, or something non-critical went wrong <------> * e.g. because of a race. In either case, simply retry. <------> */ <------>if (rc_dest == -EAGAIN || rc_src == -EAGAIN || (!rc_dest && !rc_src)) { <------><------>retry_vsie_icpt(vsie_page); <------><------>return -EAGAIN; <------>} <------>/* Something more serious went wrong, propagate the error */ <------>if (rc_dest < 0) <------><------>return rc_dest; <------>if (rc_src < 0) <------><------>return rc_src; <------>/* The only possible suppressing exception: just deliver it */ <------>if (rc_dest == PGM_TRANSLATION_SPEC || rc_src == PGM_TRANSLATION_SPEC) { <------><------>clear_vsie_icpt(vsie_page); <------><------>rc_dest = kvm_s390_inject_program_int(vcpu, PGM_TRANSLATION_SPEC); <------><------>WARN_ON_ONCE(rc_dest); <------><------>return 1; <------>} <------>/* <------> * Forward the PEI intercept to the guest if it was a page fault, or <------> * also for segment and region table faults if EDAT applies. <------> */ <------>if (edat) { <------><------>rc_dest = rc_dest == PGM_ASCE_TYPE ? rc_dest : 0; <------><------>rc_src = rc_src == PGM_ASCE_TYPE ? rc_src : 0; <------>} else { <------><------>rc_dest = rc_dest != PGM_PAGE_TRANSLATION ? rc_dest : 0; <------><------>rc_src = rc_src != PGM_PAGE_TRANSLATION ? rc_src : 0; <------>} <------>if (!rc_dest && !rc_src) { <------><------>pei_block[0] = pei_dest; <------><------>pei_block[1] = pei_src; <------><------>return 1; <------>} <------>retry_vsie_icpt(vsie_page); <------>/* <------> * The host has edat, and the guest does not, or it was an ASCE type <------> * exception. The host needs to inject the appropriate DAT interrupts <------> * into the guest. <------> */ <------>if (rc_dest) <------><------>return inject_fault(vcpu, rc_dest, dest, 1); <------>return inject_fault(vcpu, rc_src, src, 0); } /* * Run the vsie on a shadow scb and a shadow gmap, without any further * sanity checks, handling SIE faults. * * Returns: - 0 everything went fine * - > 0 if control has to be given to guest 2 * - < 0 if an error occurred */ static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) <------>__releases(vcpu->kvm->srcu) <------>__acquires(vcpu->kvm->srcu) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; <------>int guest_bp_isolation; <------>int rc = 0; <------>handle_last_fault(vcpu, vsie_page); <------>srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); <------>/* save current guest state of bp isolation override */ <------>guest_bp_isolation = test_thread_flag(TIF_ISOLATE_BP_GUEST); <------>/* <------> * The guest is running with BPBC, so we have to force it on for our <------> * nested guest. This is done by enabling BPBC globally, so the BPBC <------> * control in the SCB (which the nested guest can modify) is simply <------> * ignored. <------> */ <------>if (test_kvm_facility(vcpu->kvm, 82) && <------> vcpu->arch.sie_block->fpf & FPF_BPBC) <------><------>set_thread_flag(TIF_ISOLATE_BP_GUEST); <------>local_irq_disable(); <------>guest_enter_irqoff(); <------>local_irq_enable(); <------>/* <------> * Simulate a SIE entry of the VCPU (see sie64a), so VCPU blocking <------> * and VCPU requests also hinder the vSIE from running and lead <------> * to an immediate exit. kvm_s390_vsie_kick() has to be used to <------> * also kick the vSIE. <------> */ <------>vcpu->arch.sie_block->prog0c |= PROG_IN_SIE; <------>barrier(); <------>if (!kvm_s390_vcpu_sie_inhibited(vcpu)) <------><------>rc = sie64a(scb_s, vcpu->run->s.regs.gprs); <------>barrier(); <------>vcpu->arch.sie_block->prog0c &= ~PROG_IN_SIE; <------>local_irq_disable(); <------>guest_exit_irqoff(); <------>local_irq_enable(); <------>/* restore guest state for bp isolation override */ <------>if (!guest_bp_isolation) <------><------>clear_thread_flag(TIF_ISOLATE_BP_GUEST); <------>vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); <------>if (rc == -EINTR) { <------><------>VCPU_EVENT(vcpu, 3, "%s", "machine check"); <------><------>kvm_s390_reinject_machine_check(vcpu, &vsie_page->mcck_info); <------><------>return 0; <------>} <------>if (rc > 0) <------><------>rc = 0; /* we could still have an icpt */ <------>else if (rc == -EFAULT) <------><------>return handle_fault(vcpu, vsie_page); <------>switch (scb_s->icptcode) { <------>case ICPT_INST: <------><------>if (scb_s->ipa == 0xb2b0) <------><------><------>rc = handle_stfle(vcpu, vsie_page); <------><------>break; <------>case ICPT_STOP: <------><------>/* stop not requested by g2 - must have been a kick */ <------><------>if (!(atomic_read(&scb_o->cpuflags) & CPUSTAT_STOP_INT)) <------><------><------>clear_vsie_icpt(vsie_page); <------><------>break; <------>case ICPT_VALIDITY: <------><------>if ((scb_s->ipa & 0xf000) != 0xf000) <------><------><------>scb_s->ipa += 0x1000; <------><------>break; <------>case ICPT_PARTEXEC: <------><------>if (scb_s->ipa == 0xb254) <------><------><------>rc = vsie_handle_mvpg(vcpu, vsie_page); <------><------>break; <------>} <------>return rc; } static void release_gmap_shadow(struct vsie_page *vsie_page) { <------>if (vsie_page->gmap) <------><------>gmap_put(vsie_page->gmap); <------>WRITE_ONCE(vsie_page->gmap, NULL); <------>prefix_unmapped(vsie_page); } static int acquire_gmap_shadow(struct kvm_vcpu *vcpu, <------><------><------> struct vsie_page *vsie_page) { <------>unsigned long asce; <------>union ctlreg0 cr0; <------>struct gmap *gmap; <------>int edat; <------>asce = vcpu->arch.sie_block->gcr[1]; <------>cr0.val = vcpu->arch.sie_block->gcr[0]; <------>edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8); <------>edat += edat && test_kvm_facility(vcpu->kvm, 78); <------>/* <------> * ASCE or EDAT could have changed since last icpt, or the gmap <------> * we're holding has been unshadowed. If the gmap is still valid, <------> * we can safely reuse it. <------> */ <------>if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat)) <------><------>return 0; <------>/* release the old shadow - if any, and mark the prefix as unmapped */ <------>release_gmap_shadow(vsie_page); <------>gmap = gmap_shadow(vcpu->arch.gmap, asce, edat); <------>if (IS_ERR(gmap)) <------><------>return PTR_ERR(gmap); <------>gmap->private = vcpu->kvm; <------>WRITE_ONCE(vsie_page->gmap, gmap); <------>return 0; } /* * Register the shadow scb at the VCPU, e.g. for kicking out of vsie. */ static void register_shadow_scb(struct kvm_vcpu *vcpu, <------><------><------><------>struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s); <------>/* <------> * External calls have to lead to a kick of the vcpu and <------> * therefore the vsie -> Simulate Wait state. <------> */ <------>kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT); <------>/* <------> * We have to adjust the g3 epoch by the g2 epoch. The epoch will <------> * automatically be adjusted on tod clock changes via kvm_sync_clock. <------> */ <------>preempt_disable(); <------>scb_s->epoch += vcpu->kvm->arch.epoch; <------>if (scb_s->ecd & ECD_MEF) { <------><------>scb_s->epdx += vcpu->kvm->arch.epdx; <------><------>if (scb_s->epoch < vcpu->kvm->arch.epoch) <------><------><------>scb_s->epdx += 1; <------>} <------>preempt_enable(); } /* * Unregister a shadow scb from a VCPU. */ static void unregister_shadow_scb(struct kvm_vcpu *vcpu) { <------>kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT); <------>WRITE_ONCE(vcpu->arch.vsie_block, NULL); } /* * Run the vsie on a shadowed scb, managing the gmap shadow, handling * prefix pages and faults. * * Returns: - 0 if no errors occurred * - > 0 if control has to be given to guest 2 * - -ENOMEM if out of memory */ static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { <------>struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; <------>int rc = 0; <------>while (1) { <------><------>rc = acquire_gmap_shadow(vcpu, vsie_page); <------><------>if (!rc) <------><------><------>rc = map_prefix(vcpu, vsie_page); <------><------>if (!rc) { <------><------><------>gmap_enable(vsie_page->gmap); <------><------><------>update_intervention_requests(vsie_page); <------><------><------>rc = do_vsie_run(vcpu, vsie_page); <------><------><------>gmap_enable(vcpu->arch.gmap); <------><------>} <------><------>atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20); <------><------>if (rc == -EAGAIN) <------><------><------>rc = 0; <------><------>if (rc || scb_s->icptcode || signal_pending(current) || <------><------> kvm_s390_vcpu_has_irq(vcpu, 0) || <------><------> kvm_s390_vcpu_sie_inhibited(vcpu)) <------><------><------>break; <------><------>cond_resched(); <------>} <------>if (rc == -EFAULT) { <------><------>/* <------><------> * Addressing exceptions are always presentes as intercepts. <------><------> * As addressing exceptions are suppressing and our guest 3 PSW <------><------> * points at the responsible instruction, we have to <------><------> * forward the PSW and set the ilc. If we can't read guest 3 <------><------> * instruction, we can use an arbitrary ilc. Let's always use <------><------> * ilen = 4 for now, so we can avoid reading in guest 3 virtual <------><------> * memory. (we could also fake the shadow so the hardware <------><------> * handles it). <------><------> */ <------><------>scb_s->icptcode = ICPT_PROGI; <------><------>scb_s->iprcc = PGM_ADDRESSING; <------><------>scb_s->pgmilc = 4; <------><------>scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, 4); <------><------>rc = 1; <------>} <------>return rc; } /* * Get or create a vsie page for a scb address. * * Returns: - address of a vsie page (cached or new one) * - NULL if the same scb address is already used by another VCPU * - ERR_PTR(-ENOMEM) if out of memory */ static struct vsie_page *get_vsie_page(struct kvm *kvm, unsigned long addr) { <------>struct vsie_page *vsie_page; <------>struct page *page; <------>int nr_vcpus; <------>rcu_read_lock(); <------>page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9); <------>rcu_read_unlock(); <------>if (page) { <------><------>if (page_ref_inc_return(page) == 2) <------><------><------>return page_to_virt(page); <------><------>page_ref_dec(page); <------>} <------>/* <------> * We want at least #online_vcpus shadows, so every VCPU can execute <------> * the VSIE in parallel. <------> */ <------>nr_vcpus = atomic_read(&kvm->online_vcpus); <------>mutex_lock(&kvm->arch.vsie.mutex); <------>if (kvm->arch.vsie.page_count < nr_vcpus) { <------><------>page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA); <------><------>if (!page) { <------><------><------>mutex_unlock(&kvm->arch.vsie.mutex); <------><------><------>return ERR_PTR(-ENOMEM); <------><------>} <------><------>page_ref_inc(page); <------><------>kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page; <------><------>kvm->arch.vsie.page_count++; <------>} else { <------><------>/* reuse an existing entry that belongs to nobody */ <------><------>while (true) { <------><------><------>page = kvm->arch.vsie.pages[kvm->arch.vsie.next]; <------><------><------>if (page_ref_inc_return(page) == 2) <------><------><------><------>break; <------><------><------>page_ref_dec(page); <------><------><------>kvm->arch.vsie.next++; <------><------><------>kvm->arch.vsie.next %= nr_vcpus; <------><------>} <------><------>radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); <------>} <------>page->index = addr; <------>/* double use of the same address */ <------>if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) { <------><------>page_ref_dec(page); <------><------>mutex_unlock(&kvm->arch.vsie.mutex); <------><------>return NULL; <------>} <------>mutex_unlock(&kvm->arch.vsie.mutex); <------>vsie_page = page_to_virt(page); <------>memset(&vsie_page->scb_s, 0, sizeof(struct kvm_s390_sie_block)); <------>release_gmap_shadow(vsie_page); <------>vsie_page->fault_addr = 0; <------>vsie_page->scb_s.ihcpu = 0xffffU; <------>return vsie_page; } /* put a vsie page acquired via get_vsie_page */ static void put_vsie_page(struct kvm *kvm, struct vsie_page *vsie_page) { <------>struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT); <------>page_ref_dec(page); } int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu) { <------>struct vsie_page *vsie_page; <------>unsigned long scb_addr; <------>int rc; <------>vcpu->stat.instruction_sie++; <------>if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIEF2)) <------><------>return -EOPNOTSUPP; <------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) <------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); <------>BUILD_BUG_ON(sizeof(struct vsie_page) != PAGE_SIZE); <------>scb_addr = kvm_s390_get_base_disp_s(vcpu, NULL); <------>/* 512 byte alignment */ <------>if (unlikely(scb_addr & 0x1ffUL)) <------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); <------>if (signal_pending(current) || kvm_s390_vcpu_has_irq(vcpu, 0) || <------> kvm_s390_vcpu_sie_inhibited(vcpu)) <------><------>return 0; <------>vsie_page = get_vsie_page(vcpu->kvm, scb_addr); <------>if (IS_ERR(vsie_page)) <------><------>return PTR_ERR(vsie_page); <------>else if (!vsie_page) <------><------>/* double use of sie control block - simply do nothing */ <------><------>return 0; <------>rc = pin_scb(vcpu, vsie_page, scb_addr); <------>if (rc) <------><------>goto out_put; <------>rc = shadow_scb(vcpu, vsie_page); <------>if (rc) <------><------>goto out_unpin_scb; <------>rc = pin_blocks(vcpu, vsie_page); <------>if (rc) <------><------>goto out_unshadow; <------>register_shadow_scb(vcpu, vsie_page); <------>rc = vsie_run(vcpu, vsie_page); <------>unregister_shadow_scb(vcpu); <------>unpin_blocks(vcpu, vsie_page); out_unshadow: <------>unshadow_scb(vcpu, vsie_page); out_unpin_scb: <------>unpin_scb(vcpu, vsie_page, scb_addr); out_put: <------>put_vsie_page(vcpu->kvm, vsie_page); <------>return rc < 0 ? rc : 0; } /* Init the vsie data structures. To be called when a vm is initialized. */ void kvm_s390_vsie_init(struct kvm *kvm) { <------>mutex_init(&kvm->arch.vsie.mutex); <------>INIT_RADIX_TREE(&kvm->arch.vsie.addr_to_page, GFP_KERNEL); } /* Destroy the vsie data structures. To be called when a vm is destroyed. */ void kvm_s390_vsie_destroy(struct kvm *kvm) { <------>struct vsie_page *vsie_page; <------>struct page *page; <------>int i; <------>mutex_lock(&kvm->arch.vsie.mutex); <------>for (i = 0; i < kvm->arch.vsie.page_count; i++) { <------><------>page = kvm->arch.vsie.pages[i]; <------><------>kvm->arch.vsie.pages[i] = NULL; <------><------>vsie_page = page_to_virt(page); <------><------>release_gmap_shadow(vsie_page); <------><------>/* free the radix tree entry */ <------><------>radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9); <------><------>__free_page(page); <------>} <------>kvm->arch.vsie.page_count = 0; <------>mutex_unlock(&kvm->arch.vsie.mutex); } void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu) { <------>struct kvm_s390_sie_block *scb = READ_ONCE(vcpu->arch.vsie_block); <------>/* <------> * Even if the VCPU lets go of the shadow sie block reference, it is <------> * still valid in the cache. So we can safely kick it. <------> */ <------>if (scb) { <------><------>atomic_or(PROG_BLOCK_SIE, &scb->prog20); <------><------>if (scb->prog0c & PROG_IN_SIE) <------><------><------>atomic_or(CPUSTAT_STOP_INT, &scb->cpuflags); <------>} }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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