| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * handling privileged instructions |
| * |
| * Copyright IBM Corp. 2008, 2020 |
| * |
| * Author(s): Carsten Otte <cotte@de.ibm.com> |
| * Christian Borntraeger <borntraeger@de.ibm.com> |
| */ |
| |
| #include <linux/kvm.h> |
| #include <linux/gfp.h> |
| #include <linux/errno.h> |
| #include <linux/mm_types.h> |
| #include <linux/pgtable.h> |
| #include <linux/io.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/facility.h> |
| #include <asm/current.h> |
| #include <asm/debug.h> |
| #include <asm/ebcdic.h> |
| #include <asm/sysinfo.h> |
| #include <asm/page-states.h> |
| #include <asm/gmap.h> |
| #include <asm/ptrace.h> |
| #include <asm/sclp.h> |
| #include <asm/ap.h> |
| #include "gaccess.h" |
| #include "kvm-s390.h" |
| #include "trace.h" |
| |
| static int handle_ri(struct kvm_vcpu *vcpu) |
| { |
| vcpu->stat.instruction_ri++; |
| |
| if (test_kvm_facility(vcpu->kvm, 64)) { |
| VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)"); |
| vcpu->arch.sie_block->ecb3 |= ECB3_RI; |
| kvm_s390_retry_instr(vcpu); |
| return 0; |
| } else |
| return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); |
| } |
| |
| int kvm_s390_handle_aa(struct kvm_vcpu *vcpu) |
| { |
| if ((vcpu->arch.sie_block->ipa & 0xf) <= 4) |
| return handle_ri(vcpu); |
| else |
| return -EOPNOTSUPP; |
| } |
| |
| static int handle_gs(struct kvm_vcpu *vcpu) |
| { |
| vcpu->stat.instruction_gs++; |
| |
| if (test_kvm_facility(vcpu->kvm, 133)) { |
| VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)"); |
| preempt_disable(); |
| local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT); |
| current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb; |
| restore_gs_cb(current->thread.gs_cb); |
| preempt_enable(); |
| vcpu->arch.sie_block->ecb |= ECB_GS; |
| vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; |
| vcpu->arch.gs_enabled = 1; |
| kvm_s390_retry_instr(vcpu); |
| return 0; |
| } else |
| return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); |
| } |
| |
| int kvm_s390_handle_e3(struct kvm_vcpu *vcpu) |
| { |
| int code = vcpu->arch.sie_block->ipb & 0xff; |
| |
| if (code == 0x49 || code == 0x4d) |
| return handle_gs(vcpu); |
| else |
| return -EOPNOTSUPP; |
| } |
| /* Handle SCK (SET CLOCK) interception */ |
| static int handle_set_clock(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_vm_tod_clock gtod = { 0 }; |
| int rc; |
| u8 ar; |
| u64 op2; |
| |
| vcpu->stat.instruction_sck++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| op2 = kvm_s390_get_base_disp_s(vcpu, &ar); |
| if (op2 & 7) /* Operand must be on a doubleword boundary */ |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| |
| VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod); |
| /* |
| * To set the TOD clock the kvm lock must be taken, but the vcpu lock |
| * is already held in handle_set_clock. The usual lock order is the |
| * opposite. As SCK is deprecated and should not be used in several |
| * cases, for example when the multiple epoch facility or TOD clock |
| * steering facility is installed (see Principles of Operation), a |
| * slow path can be used. If the lock can not be taken via try_lock, |
| * the instruction will be retried via -EAGAIN at a later point in |
| * time. |
| */ |
| if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) { |
| kvm_s390_retry_instr(vcpu); |
| return -EAGAIN; |
| } |
| |
| kvm_s390_set_psw_cc(vcpu, 0); |
| return 0; |
| } |
| |
| static int handle_set_prefix(struct kvm_vcpu *vcpu) |
| { |
| u64 operand2; |
| u32 address; |
| int rc; |
| u8 ar; |
| |
| vcpu->stat.instruction_spx++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); |
| |
| /* must be word boundary */ |
| if (operand2 & 3) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| /* get the value */ |
| rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| |
| address &= 0x7fffe000u; |
| |
| /* |
| * Make sure the new value is valid memory. We only need to check the |
| * first page, since address is 8k aligned and memory pieces are always |
| * at least 1MB aligned and have at least a size of 1MB. |
| */ |
| if (kvm_is_error_gpa(vcpu->kvm, address)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| |
| kvm_s390_set_prefix(vcpu, address); |
| trace_kvm_s390_handle_prefix(vcpu, 1, address); |
| return 0; |
| } |
| |
| static int handle_store_prefix(struct kvm_vcpu *vcpu) |
| { |
| u64 operand2; |
| u32 address; |
| int rc; |
| u8 ar; |
| |
| vcpu->stat.instruction_stpx++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); |
| |
| /* must be word boundary */ |
| if (operand2 & 3) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| address = kvm_s390_get_prefix(vcpu); |
| |
| /* get the value */ |
| rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| |
| VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); |
| trace_kvm_s390_handle_prefix(vcpu, 0, address); |
| return 0; |
| } |
| |
| static int handle_store_cpu_address(struct kvm_vcpu *vcpu) |
| { |
| u16 vcpu_id = vcpu->vcpu_id; |
| u64 ga; |
| int rc; |
| u8 ar; |
| |
| vcpu->stat.instruction_stap++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| ga = kvm_s390_get_base_disp_s(vcpu, &ar); |
| |
| if (ga & 1) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| |
| VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); |
| trace_kvm_s390_handle_stap(vcpu, ga); |
| return 0; |
| } |
| |
| int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) |
| { |
| int rc; |
| |
| trace_kvm_s390_skey_related_inst(vcpu); |
| /* Already enabled? */ |
| if (vcpu->arch.skey_enabled) |
| return 0; |
| |
| rc = s390_enable_skey(); |
| VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); |
| if (rc) |
| return rc; |
| |
| if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) |
| kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); |
| if (!vcpu->kvm->arch.use_skf) |
| vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; |
| else |
| vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); |
| vcpu->arch.skey_enabled = true; |
| return 0; |
| } |
| |
| static int try_handle_skey(struct kvm_vcpu *vcpu) |
| { |
| int rc; |
| |
| rc = kvm_s390_skey_check_enable(vcpu); |
| if (rc) |
| return rc; |
| if (vcpu->kvm->arch.use_skf) { |
| /* with storage-key facility, SIE interprets it for us */ |
| kvm_s390_retry_instr(vcpu); |
| VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); |
| return -EAGAIN; |
| } |
| return 0; |
| } |
| |
| static int handle_iske(struct kvm_vcpu *vcpu) |
| { |
| unsigned long gaddr, vmaddr; |
| unsigned char key; |
| int reg1, reg2; |
| bool unlocked; |
| int rc; |
| |
| vcpu->stat.instruction_iske++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| rc = try_handle_skey(vcpu); |
| if (rc) |
| return rc != -EAGAIN ? rc : 0; |
| |
| kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
| |
| gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; |
| gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); |
| gaddr = kvm_s390_real_to_abs(vcpu, gaddr); |
| vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); |
| if (kvm_is_error_hva(vmaddr)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| retry: |
| unlocked = false; |
| mmap_read_lock(current->mm); |
| rc = get_guest_storage_key(current->mm, vmaddr, &key); |
| |
| if (rc) { |
| rc = fixup_user_fault(current->mm, vmaddr, |
| FAULT_FLAG_WRITE, &unlocked); |
| if (!rc) { |
| mmap_read_unlock(current->mm); |
| goto retry; |
| } |
| } |
| mmap_read_unlock(current->mm); |
| if (rc == -EFAULT) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| if (rc < 0) |
| return rc; |
| vcpu->run->s.regs.gprs[reg1] &= ~0xff; |
| vcpu->run->s.regs.gprs[reg1] |= key; |
| return 0; |
| } |
| |
| static int handle_rrbe(struct kvm_vcpu *vcpu) |
| { |
| unsigned long vmaddr, gaddr; |
| int reg1, reg2; |
| bool unlocked; |
| int rc; |
| |
| vcpu->stat.instruction_rrbe++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| rc = try_handle_skey(vcpu); |
| if (rc) |
| return rc != -EAGAIN ? rc : 0; |
| |
| kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
| |
| gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; |
| gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); |
| gaddr = kvm_s390_real_to_abs(vcpu, gaddr); |
| vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); |
| if (kvm_is_error_hva(vmaddr)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| retry: |
| unlocked = false; |
| mmap_read_lock(current->mm); |
| rc = reset_guest_reference_bit(current->mm, vmaddr); |
| if (rc < 0) { |
| rc = fixup_user_fault(current->mm, vmaddr, |
| FAULT_FLAG_WRITE, &unlocked); |
| if (!rc) { |
| mmap_read_unlock(current->mm); |
| goto retry; |
| } |
| } |
| mmap_read_unlock(current->mm); |
| if (rc == -EFAULT) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| if (rc < 0) |
| return rc; |
| kvm_s390_set_psw_cc(vcpu, rc); |
| return 0; |
| } |
| |
| #define SSKE_NQ 0x8 |
| #define SSKE_MR 0x4 |
| #define SSKE_MC 0x2 |
| #define SSKE_MB 0x1 |
| static int handle_sske(struct kvm_vcpu *vcpu) |
| { |
| unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; |
| unsigned long start, end; |
| unsigned char key, oldkey; |
| int reg1, reg2; |
| bool unlocked; |
| int rc; |
| |
| vcpu->stat.instruction_sske++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| rc = try_handle_skey(vcpu); |
| if (rc) |
| return rc != -EAGAIN ? rc : 0; |
| |
| if (!test_kvm_facility(vcpu->kvm, 8)) |
| m3 &= ~SSKE_MB; |
| if (!test_kvm_facility(vcpu->kvm, 10)) |
| m3 &= ~(SSKE_MC | SSKE_MR); |
| if (!test_kvm_facility(vcpu->kvm, 14)) |
| m3 &= ~SSKE_NQ; |
| |
| kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
| |
| key = vcpu->run->s.regs.gprs[reg1] & 0xfe; |
| start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; |
| start = kvm_s390_logical_to_effective(vcpu, start); |
| if (m3 & SSKE_MB) { |
| /* start already designates an absolute address */ |
| end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); |
| } else { |
| start = kvm_s390_real_to_abs(vcpu, start); |
| end = start + PAGE_SIZE; |
| } |
| |
| while (start != end) { |
| unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); |
| unlocked = false; |
| |
| if (kvm_is_error_hva(vmaddr)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| |
| mmap_read_lock(current->mm); |
| rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey, |
| m3 & SSKE_NQ, m3 & SSKE_MR, |
| m3 & SSKE_MC); |
| |
| if (rc < 0) { |
| rc = fixup_user_fault(current->mm, vmaddr, |
| FAULT_FLAG_WRITE, &unlocked); |
| rc = !rc ? -EAGAIN : rc; |
| } |
| mmap_read_unlock(current->mm); |
| if (rc == -EFAULT) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| if (rc == -EAGAIN) |
| continue; |
| if (rc < 0) |
| return rc; |
| start += PAGE_SIZE; |
| } |
| |
| if (m3 & (SSKE_MC | SSKE_MR)) { |
| if (m3 & SSKE_MB) { |
| /* skey in reg1 is unpredictable */ |
| kvm_s390_set_psw_cc(vcpu, 3); |
| } else { |
| kvm_s390_set_psw_cc(vcpu, rc); |
| vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; |
| vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; |
| } |
| } |
| if (m3 & SSKE_MB) { |
| if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) |
| vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; |
| else |
| vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; |
| end = kvm_s390_logical_to_effective(vcpu, end); |
| vcpu->run->s.regs.gprs[reg2] |= end; |
| } |
| return 0; |
| } |
| |
| static int handle_ipte_interlock(struct kvm_vcpu *vcpu) |
| { |
| vcpu->stat.instruction_ipte_interlock++; |
| if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm)); |
| kvm_s390_retry_instr(vcpu); |
| VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); |
| return 0; |
| } |
| |
| static int handle_test_block(struct kvm_vcpu *vcpu) |
| { |
| gpa_t addr; |
| int reg2; |
| |
| vcpu->stat.instruction_tb++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| kvm_s390_get_regs_rre(vcpu, NULL, ®2); |
| addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; |
| addr = kvm_s390_logical_to_effective(vcpu, addr); |
| if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) |
| return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); |
| addr = kvm_s390_real_to_abs(vcpu, addr); |
| |
| if (kvm_is_error_gpa(vcpu->kvm, addr)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| /* |
| * We don't expect errors on modern systems, and do not care |
| * about storage keys (yet), so let's just clear the page. |
| */ |
| if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) |
| return -EFAULT; |
| kvm_s390_set_psw_cc(vcpu, 0); |
| vcpu->run->s.regs.gprs[0] = 0; |
| return 0; |
| } |
| |
| static int handle_tpi(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_interrupt_info *inti; |
| unsigned long len; |
| u32 tpi_data[3]; |
| int rc; |
| u64 addr; |
| u8 ar; |
| |
| vcpu->stat.instruction_tpi++; |
| |
| addr = kvm_s390_get_base_disp_s(vcpu, &ar); |
| if (addr & 3) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); |
| if (!inti) { |
| kvm_s390_set_psw_cc(vcpu, 0); |
| return 0; |
| } |
| |
| tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; |
| tpi_data[1] = inti->io.io_int_parm; |
| tpi_data[2] = inti->io.io_int_word; |
| if (addr) { |
| /* |
| * Store the two-word I/O interruption code into the |
| * provided area. |
| */ |
| len = sizeof(tpi_data) - 4; |
| rc = write_guest(vcpu, addr, ar, &tpi_data, len); |
| if (rc) { |
| rc = kvm_s390_inject_prog_cond(vcpu, rc); |
| goto reinject_interrupt; |
| } |
| } else { |
| /* |
| * Store the three-word I/O interruption code into |
| * the appropriate lowcore area. |
| */ |
| len = sizeof(tpi_data); |
| if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { |
| /* failed writes to the low core are not recoverable */ |
| rc = -EFAULT; |
| goto reinject_interrupt; |
| } |
| } |
| |
| /* irq was successfully handed to the guest */ |
| kfree(inti); |
| kvm_s390_set_psw_cc(vcpu, 1); |
| return 0; |
| reinject_interrupt: |
| /* |
| * If we encounter a problem storing the interruption code, the |
| * instruction is suppressed from the guest's view: reinject the |
| * interrupt. |
| */ |
| if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { |
| kfree(inti); |
| rc = -EFAULT; |
| } |
| /* don't set the cc, a pgm irq was injected or we drop to user space */ |
| return rc ? -EFAULT : 0; |
| } |
| |
| static int handle_tsch(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_s390_interrupt_info *inti = NULL; |
| const u64 isc_mask = 0xffUL << 24; /* all iscs set */ |
| |
| vcpu->stat.instruction_tsch++; |
| |
| /* a valid schid has at least one bit set */ |
| if (vcpu->run->s.regs.gprs[1]) |
| inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, |
| vcpu->run->s.regs.gprs[1]); |
| |
| /* |
| * Prepare exit to userspace. |
| * We indicate whether we dequeued a pending I/O interrupt |
| * so that userspace can re-inject it if the instruction gets |
| * a program check. While this may re-order the pending I/O |
| * interrupts, this is no problem since the priority is kept |
| * intact. |
| */ |
| vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; |
| vcpu->run->s390_tsch.dequeued = !!inti; |
| if (inti) { |
| vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; |
| vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; |
| vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; |
| vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; |
| } |
| vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; |
| kfree(inti); |
| return -EREMOTE; |
| } |
| |
| static int handle_io_inst(struct kvm_vcpu *vcpu) |
| { |
| VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| if (vcpu->kvm->arch.css_support) { |
| /* |
| * Most I/O instructions will be handled by userspace. |
| * Exceptions are tpi and the interrupt portion of tsch. |
| */ |
| if (vcpu->arch.sie_block->ipa == 0xb236) |
| return handle_tpi(vcpu); |
| if (vcpu->arch.sie_block->ipa == 0xb235) |
| return handle_tsch(vcpu); |
| /* Handle in userspace. */ |
| vcpu->stat.instruction_io_other++; |
| return -EOPNOTSUPP; |
| } else { |
| /* |
| * Set condition code 3 to stop the guest from issuing channel |
| * I/O instructions. |
| */ |
| kvm_s390_set_psw_cc(vcpu, 3); |
| return 0; |
| } |
| } |
| |
| /* |
| * handle_pqap: Handling pqap interception |
| * @vcpu: the vcpu having issue the pqap instruction |
| * |
| * We now support PQAP/AQIC instructions and we need to correctly |
| * answer the guest even if no dedicated driver's hook is available. |
| * |
| * The intercepting code calls a dedicated callback for this instruction |
| * if a driver did register one in the CRYPTO satellite of the |
| * SIE block. |
| * |
| * If no callback is available, the queues are not available, return this |
| * response code to the caller and set CC to 3. |
| * Else return the response code returned by the callback. |
| */ |
| static int handle_pqap(struct kvm_vcpu *vcpu) |
| { |
| struct ap_queue_status status = {}; |
| crypto_hook pqap_hook; |
| unsigned long reg0; |
| int ret; |
| uint8_t fc; |
| |
| /* Verify that the AP instruction are available */ |
| if (!ap_instructions_available()) |
| return -EOPNOTSUPP; |
| /* Verify that the guest is allowed to use AP instructions */ |
| if (!(vcpu->arch.sie_block->eca & ECA_APIE)) |
| return -EOPNOTSUPP; |
| /* |
| * The only possibly intercepted functions when AP instructions are |
| * available for the guest are AQIC and TAPQ with the t bit set |
| * since we do not set IC.3 (FIII) we currently will only intercept |
| * the AQIC function code. |
| * Note: running nested under z/VM can result in intercepts for other |
| * function codes, e.g. PQAP(QCI). We do not support this and bail out. |
| */ |
| reg0 = vcpu->run->s.regs.gprs[0]; |
| fc = (reg0 >> 24) & 0xff; |
| if (fc != 0x03) |
| return -EOPNOTSUPP; |
| |
| /* PQAP instruction is allowed for guest kernel only */ |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| /* Common PQAP instruction specification exceptions */ |
| /* bits 41-47 must all be zeros */ |
| if (reg0 & 0x007f0000UL) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| /* APFT not install and T bit set */ |
| if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| /* APXA not installed and APID greater 64 or APQI greater 16 */ |
| if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| /* AQIC function code specific exception */ |
| /* facility 65 not present for AQIC function code */ |
| if (!test_kvm_facility(vcpu->kvm, 65)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| /* |
| * If the hook callback is registered, there will be a pointer to the |
| * hook function pointer in the kvm_s390_crypto structure. Lock the |
| * owner, retrieve the hook function pointer and call the hook. |
| */ |
| down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); |
| if (vcpu->kvm->arch.crypto.pqap_hook) { |
| pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook; |
| ret = pqap_hook(vcpu); |
| if (!ret) { |
| if (vcpu->run->s.regs.gprs[1] & 0x00ff0000) |
| kvm_s390_set_psw_cc(vcpu, 3); |
| else |
| kvm_s390_set_psw_cc(vcpu, 0); |
| } |
| up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); |
| return ret; |
| } |
| up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem); |
| /* |
| * A vfio_driver must register a hook. |
| * No hook means no driver to enable the SIE CRYCB and no queues. |
| * We send this response to the guest. |
| */ |
| status.response_code = 0x01; |
| memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status)); |
| kvm_s390_set_psw_cc(vcpu, 3); |
| return 0; |
| } |
| |
| static int handle_stfl(struct kvm_vcpu *vcpu) |
| { |
| int rc; |
| unsigned int fac; |
| |
| vcpu->stat.instruction_stfl++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| /* |
| * We need to shift the lower 32 facility bits (bit 0-31) from a u64 |
| * into a u32 memory representation. They will remain bits 0-31. |
| */ |
| fac = *vcpu->kvm->arch.model.fac_list >> 32; |
| rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), |
| &fac, sizeof(fac)); |
| if (rc) |
| return rc; |
| VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); |
| trace_kvm_s390_handle_stfl(vcpu, fac); |
| return 0; |
| } |
| |
| #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) |
| #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL |
| #define PSW_ADDR_24 0x0000000000ffffffUL |
| #define PSW_ADDR_31 0x000000007fffffffUL |
| |
| int is_valid_psw(psw_t *psw) |
| { |
| if (psw->mask & PSW_MASK_UNASSIGNED) |
| return 0; |
| if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { |
| if (psw->addr & ~PSW_ADDR_31) |
| return 0; |
| } |
| if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) |
| return 0; |
| if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) |
| return 0; |
| if (psw->addr & 1) |
| return 0; |
| return 1; |
| } |
| |
| int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) |
| { |
| psw_t *gpsw = &vcpu->arch.sie_block->gpsw; |
| psw_compat_t new_psw; |
| u64 addr; |
| int rc; |
| u8 ar; |
| |
| vcpu->stat.instruction_lpsw++; |
| |
| if (gpsw->mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| addr = kvm_s390_get_base_disp_s(vcpu, &ar); |
| if (addr & 7) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| if (!(new_psw.mask & PSW32_MASK_BASE)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; |
| gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; |
| gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; |
| if (!is_valid_psw(gpsw)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| return 0; |
| } |
| |
| static int handle_lpswe(struct kvm_vcpu *vcpu) |
| { |
| psw_t new_psw; |
| u64 addr; |
| int rc; |
| u8 ar; |
| |
| vcpu->stat.instruction_lpswe++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| addr = kvm_s390_get_base_disp_s(vcpu, &ar); |
| if (addr & 7) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| vcpu->arch.sie_block->gpsw = new_psw; |
| if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| return 0; |
| } |
| |
| static int handle_stidp(struct kvm_vcpu *vcpu) |
| { |
| u64 stidp_data = vcpu->kvm->arch.model.cpuid; |
| u64 operand2; |
| int rc; |
| u8 ar; |
| |
| vcpu->stat.instruction_stidp++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); |
| |
| if (operand2 & 7) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| |
| VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); |
| return 0; |
| } |
| |
| static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) |
| { |
| int cpus = 0; |
| int n; |
| |
| cpus = atomic_read(&vcpu->kvm->online_vcpus); |
| |
| /* deal with other level 3 hypervisors */ |
| if (stsi(mem, 3, 2, 2)) |
| mem->count = 0; |
| if (mem->count < 8) |
| mem->count++; |
| for (n = mem->count - 1; n > 0 ; n--) |
| memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); |
| |
| memset(&mem->vm[0], 0, sizeof(mem->vm[0])); |
| mem->vm[0].cpus_total = cpus; |
| mem->vm[0].cpus_configured = cpus; |
| mem->vm[0].cpus_standby = 0; |
| mem->vm[0].cpus_reserved = 0; |
| mem->vm[0].caf = 1000; |
| memcpy(mem->vm[0].name, "KVMguest", 8); |
| ASCEBC(mem->vm[0].name, 8); |
| memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); |
| ASCEBC(mem->vm[0].cpi, 16); |
| } |
| |
| static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, |
| u8 fc, u8 sel1, u16 sel2) |
| { |
| vcpu->run->exit_reason = KVM_EXIT_S390_STSI; |
| vcpu->run->s390_stsi.addr = addr; |
| vcpu->run->s390_stsi.ar = ar; |
| vcpu->run->s390_stsi.fc = fc; |
| vcpu->run->s390_stsi.sel1 = sel1; |
| vcpu->run->s390_stsi.sel2 = sel2; |
| } |
| |
| static int handle_stsi(struct kvm_vcpu *vcpu) |
| { |
| int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; |
| int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; |
| int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; |
| unsigned long mem = 0; |
| u64 operand2; |
| int rc = 0; |
| u8 ar; |
| |
| vcpu->stat.instruction_stsi++; |
| VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| /* Bailout forbidden function codes */ |
| if (fc > 3 && fc != 15) |
| goto out_no_data; |
| |
| /* |
| * fc 15 is provided only with |
| * - PTF/CPU topology support through facility 15 |
| * - KVM_CAP_S390_USER_STSI |
| */ |
| if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) || |
| !vcpu->kvm->arch.user_stsi)) |
| goto out_no_data; |
| |
| if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 |
| || vcpu->run->s.regs.gprs[1] & 0xffff0000) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| if (fc == 0) { |
| vcpu->run->s.regs.gprs[0] = 3 << 28; |
| kvm_s390_set_psw_cc(vcpu, 0); |
| return 0; |
| } |
| |
| operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); |
| |
| if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| switch (fc) { |
| case 1: /* same handling for 1 and 2 */ |
| case 2: |
| mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); |
| if (!mem) |
| goto out_no_data; |
| if (stsi((void *) mem, fc, sel1, sel2)) |
| goto out_no_data; |
| break; |
| case 3: |
| if (sel1 != 2 || sel2 != 2) |
| goto out_no_data; |
| mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); |
| if (!mem) |
| goto out_no_data; |
| handle_stsi_3_2_2(vcpu, (void *) mem); |
| break; |
| case 15: /* fc 15 is fully handled in userspace */ |
| insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); |
| trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); |
| return -EREMOTE; |
| } |
| if (kvm_s390_pv_cpu_is_protected(vcpu)) { |
| memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE); |
| rc = 0; |
| } else { |
| rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); |
| } |
| if (rc) { |
| rc = kvm_s390_inject_prog_cond(vcpu, rc); |
| goto out; |
| } |
| if (vcpu->kvm->arch.user_stsi) { |
| insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); |
| rc = -EREMOTE; |
| } |
| trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); |
| free_page(mem); |
| kvm_s390_set_psw_cc(vcpu, 0); |
| vcpu->run->s.regs.gprs[0] = 0; |
| return rc; |
| out_no_data: |
| kvm_s390_set_psw_cc(vcpu, 3); |
| out: |
| free_page(mem); |
| return rc; |
| } |
| |
| int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) |
| { |
| switch (vcpu->arch.sie_block->ipa & 0x00ff) { |
| case 0x02: |
| return handle_stidp(vcpu); |
| case 0x04: |
| return handle_set_clock(vcpu); |
| case 0x10: |
| return handle_set_prefix(vcpu); |
| case 0x11: |
| return handle_store_prefix(vcpu); |
| case 0x12: |
| return handle_store_cpu_address(vcpu); |
| case 0x14: |
| return kvm_s390_handle_vsie(vcpu); |
| case 0x21: |
| case 0x50: |
| return handle_ipte_interlock(vcpu); |
| case 0x29: |
| return handle_iske(vcpu); |
| case 0x2a: |
| return handle_rrbe(vcpu); |
| case 0x2b: |
| return handle_sske(vcpu); |
| case 0x2c: |
| return handle_test_block(vcpu); |
| case 0x30: |
| case 0x31: |
| case 0x32: |
| case 0x33: |
| case 0x34: |
| case 0x35: |
| case 0x36: |
| case 0x37: |
| case 0x38: |
| case 0x39: |
| case 0x3a: |
| case 0x3b: |
| case 0x3c: |
| case 0x5f: |
| case 0x74: |
| case 0x76: |
| return handle_io_inst(vcpu); |
| case 0x56: |
| return handle_sthyi(vcpu); |
| case 0x7d: |
| return handle_stsi(vcpu); |
| case 0xaf: |
| return handle_pqap(vcpu); |
| case 0xb1: |
| return handle_stfl(vcpu); |
| case 0xb2: |
| return handle_lpswe(vcpu); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| static int handle_epsw(struct kvm_vcpu *vcpu) |
| { |
| int reg1, reg2; |
| |
| vcpu->stat.instruction_epsw++; |
| |
| kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
| |
| /* This basically extracts the mask half of the psw. */ |
| vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; |
| vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; |
| if (reg2) { |
| vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; |
| vcpu->run->s.regs.gprs[reg2] |= |
| vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; |
| } |
| return 0; |
| } |
| |
| #define PFMF_RESERVED 0xfffc0101UL |
| #define PFMF_SK 0x00020000UL |
| #define PFMF_CF 0x00010000UL |
| #define PFMF_UI 0x00008000UL |
| #define PFMF_FSC 0x00007000UL |
| #define PFMF_NQ 0x00000800UL |
| #define PFMF_MR 0x00000400UL |
| #define PFMF_MC 0x00000200UL |
| #define PFMF_KEY 0x000000feUL |
| |
| static int handle_pfmf(struct kvm_vcpu *vcpu) |
| { |
| bool mr = false, mc = false, nq; |
| int reg1, reg2; |
| unsigned long start, end; |
| unsigned char key; |
| |
| vcpu->stat.instruction_pfmf++; |
| |
| kvm_s390_get_regs_rre(vcpu, ®1, ®2); |
| |
| if (!test_kvm_facility(vcpu->kvm, 8)) |
| return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| /* Only provide non-quiescing support if enabled for the guest */ |
| if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && |
| !test_kvm_facility(vcpu->kvm, 14)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| /* Only provide conditional-SSKE support if enabled for the guest */ |
| if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && |
| test_kvm_facility(vcpu->kvm, 10)) { |
| mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; |
| mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; |
| } |
| |
| nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; |
| key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; |
| start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; |
| start = kvm_s390_logical_to_effective(vcpu, start); |
| |
| if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { |
| if (kvm_s390_check_low_addr_prot_real(vcpu, start)) |
| return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); |
| } |
| |
| switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { |
| case 0x00000000: |
| /* only 4k frames specify a real address */ |
| start = kvm_s390_real_to_abs(vcpu, start); |
| end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); |
| break; |
| case 0x00001000: |
| end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); |
| break; |
| case 0x00002000: |
| /* only support 2G frame size if EDAT2 is available and we are |
| not in 24-bit addressing mode */ |
| if (!test_kvm_facility(vcpu->kvm, 78) || |
| psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); |
| break; |
| default: |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| } |
| |
| while (start != end) { |
| unsigned long vmaddr; |
| bool unlocked = false; |
| |
| /* Translate guest address to host address */ |
| vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); |
| if (kvm_is_error_hva(vmaddr)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| |
| if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { |
| if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| } |
| |
| if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { |
| int rc = kvm_s390_skey_check_enable(vcpu); |
| |
| if (rc) |
| return rc; |
| mmap_read_lock(current->mm); |
| rc = cond_set_guest_storage_key(current->mm, vmaddr, |
| key, NULL, nq, mr, mc); |
| if (rc < 0) { |
| rc = fixup_user_fault(current->mm, vmaddr, |
| FAULT_FLAG_WRITE, &unlocked); |
| rc = !rc ? -EAGAIN : rc; |
| } |
| mmap_read_unlock(current->mm); |
| if (rc == -EFAULT) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| if (rc == -EAGAIN) |
| continue; |
| if (rc < 0) |
| return rc; |
| } |
| start += PAGE_SIZE; |
| } |
| if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { |
| if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { |
| vcpu->run->s.regs.gprs[reg2] = end; |
| } else { |
| vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; |
| end = kvm_s390_logical_to_effective(vcpu, end); |
| vcpu->run->s.regs.gprs[reg2] |= end; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu) |
| */ |
| static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) |
| { |
| int r1, r2, nappended, entries; |
| unsigned long gfn, hva, res, pgstev, ptev; |
| unsigned long *cbrlo; |
| |
| /* |
| * We don't need to set SD.FPF.SK to 1 here, because if we have a |
| * machine check here we either handle it or crash |
| */ |
| |
| kvm_s390_get_regs_rre(vcpu, &r1, &r2); |
| gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; |
| hva = gfn_to_hva(vcpu->kvm, gfn); |
| entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; |
| |
| if (kvm_is_error_hva(hva)) |
| return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
| |
| nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); |
| if (nappended < 0) { |
| res = orc ? 0x10 : 0; |
| vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ |
| return 0; |
| } |
| res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; |
| /* |
| * Set the block-content state part of the result. 0 means resident, so |
| * nothing to do if the page is valid. 2 is for preserved pages |
| * (non-present and non-zero), and 3 for zero pages (non-present and |
| * zero). |
| */ |
| if (ptev & _PAGE_INVALID) { |
| res |= 2; |
| if (pgstev & _PGSTE_GPS_ZERO) |
| res |= 1; |
| } |
| if (pgstev & _PGSTE_GPS_NODAT) |
| res |= 0x20; |
| vcpu->run->s.regs.gprs[r1] = res; |
| /* |
| * It is possible that all the normal 511 slots were full, in which case |
| * we will now write in the 512th slot, which is reserved for host use. |
| * In both cases we let the normal essa handling code process all the |
| * slots, including the reserved one, if needed. |
| */ |
| if (nappended > 0) { |
| cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); |
| cbrlo[entries] = gfn << PAGE_SHIFT; |
| } |
| |
| if (orc) { |
| struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); |
| |
| /* Increment only if we are really flipping the bit */ |
| if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) |
| atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); |
| } |
| |
| return nappended; |
| } |
| |
| static int handle_essa(struct kvm_vcpu *vcpu) |
| { |
| /* entries expected to be 1FF */ |
| int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; |
| unsigned long *cbrlo; |
| struct gmap *gmap; |
| int i, orc; |
| |
| VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); |
| gmap = vcpu->arch.gmap; |
| vcpu->stat.instruction_essa++; |
| if (!vcpu->kvm->arch.use_cmma) |
| return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| /* Check for invalid operation request code */ |
| orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; |
| /* ORCs 0-6 are always valid */ |
| if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT |
| : ESSA_SET_STABLE_IF_RESIDENT)) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| if (!vcpu->kvm->arch.migration_mode) { |
| /* |
| * CMMA is enabled in the KVM settings, but is disabled in |
| * the SIE block and in the mm_context, and we are not doing |
| * a migration. Enable CMMA in the mm_context. |
| * Since we need to take a write lock to write to the context |
| * to avoid races with storage keys handling, we check if the |
| * value really needs to be written to; if the value is |
| * already correct, we do nothing and avoid the lock. |
| */ |
| if (vcpu->kvm->mm->context.uses_cmm == 0) { |
| mmap_write_lock(vcpu->kvm->mm); |
| vcpu->kvm->mm->context.uses_cmm = 1; |
| mmap_write_unlock(vcpu->kvm->mm); |
| } |
| /* |
| * If we are here, we are supposed to have CMMA enabled in |
| * the SIE block. Enabling CMMA works on a per-CPU basis, |
| * while the context use_cmma flag is per process. |
| * It's possible that the context flag is enabled and the |
| * SIE flag is not, so we set the flag always; if it was |
| * already set, nothing changes, otherwise we enable it |
| * on this CPU too. |
| */ |
| vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; |
| /* Retry the ESSA instruction */ |
| kvm_s390_retry_instr(vcpu); |
| } else { |
| int srcu_idx; |
| |
| mmap_read_lock(vcpu->kvm->mm); |
| srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
| i = __do_essa(vcpu, orc); |
| srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); |
| mmap_read_unlock(vcpu->kvm->mm); |
| if (i < 0) |
| return i; |
| /* Account for the possible extra cbrl entry */ |
| entries += i; |
| } |
| vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ |
| cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); |
| mmap_read_lock(gmap->mm); |
| for (i = 0; i < entries; ++i) |
| __gmap_zap(gmap, cbrlo[i]); |
| mmap_read_unlock(gmap->mm); |
| return 0; |
| } |
| |
| int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) |
| { |
| switch (vcpu->arch.sie_block->ipa & 0x00ff) { |
| case 0x8a: |
| case 0x8e: |
| case 0x8f: |
| return handle_ipte_interlock(vcpu); |
| case 0x8d: |
| return handle_epsw(vcpu); |
| case 0xab: |
| return handle_essa(vcpu); |
| case 0xaf: |
| return handle_pfmf(vcpu); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) |
| { |
| int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; |
| int reg3 = vcpu->arch.sie_block->ipa & 0x000f; |
| int reg, rc, nr_regs; |
| u32 ctl_array[16]; |
| u64 ga; |
| u8 ar; |
| |
| vcpu->stat.instruction_lctl++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| ga = kvm_s390_get_base_disp_rs(vcpu, &ar); |
| |
| if (ga & 3) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); |
| trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); |
| |
| nr_regs = ((reg3 - reg1) & 0xf) + 1; |
| rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| reg = reg1; |
| nr_regs = 0; |
| do { |
| vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; |
| vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; |
| if (reg == reg3) |
| break; |
| reg = (reg + 1) % 16; |
| } while (1); |
| kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| return 0; |
| } |
| |
| int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) |
| { |
| int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; |
| int reg3 = vcpu->arch.sie_block->ipa & 0x000f; |
| int reg, rc, nr_regs; |
| u32 ctl_array[16]; |
| u64 ga; |
| u8 ar; |
| |
| vcpu->stat.instruction_stctl++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| ga = kvm_s390_get_base_disp_rs(vcpu, &ar); |
| |
| if (ga & 3) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); |
| trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); |
| |
| reg = reg1; |
| nr_regs = 0; |
| do { |
| ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; |
| if (reg == reg3) |
| break; |
| reg = (reg + 1) % 16; |
| } while (1); |
| rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); |
| return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; |
| } |
| |
| static int handle_lctlg(struct kvm_vcpu *vcpu) |
| { |
| int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; |
| int reg3 = vcpu->arch.sie_block->ipa & 0x000f; |
| int reg, rc, nr_regs; |
| u64 ctl_array[16]; |
| u64 ga; |
| u8 ar; |
| |
| vcpu->stat.instruction_lctlg++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); |
| |
| if (ga & 7) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); |
| trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); |
| |
| nr_regs = ((reg3 - reg1) & 0xf) + 1; |
| rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); |
| if (rc) |
| return kvm_s390_inject_prog_cond(vcpu, rc); |
| reg = reg1; |
| nr_regs = 0; |
| do { |
| vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; |
| if (reg == reg3) |
| break; |
| reg = (reg + 1) % 16; |
| } while (1); |
| kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| return 0; |
| } |
| |
| static int handle_stctg(struct kvm_vcpu *vcpu) |
| { |
| int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; |
| int reg3 = vcpu->arch.sie_block->ipa & 0x000f; |
| int reg, rc, nr_regs; |
| u64 ctl_array[16]; |
| u64 ga; |
| u8 ar; |
| |
| vcpu->stat.instruction_stctg++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); |
| |
| if (ga & 7) |
| return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); |
| |
| VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); |
| trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); |
| |
| reg = reg1; |
| nr_regs = 0; |
| do { |
| ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; |
| if (reg == reg3) |
| break; |
| reg = (reg + 1) % 16; |
| } while (1); |
| rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); |
| return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; |
| } |
| |
| int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) |
| { |
| switch (vcpu->arch.sie_block->ipb & 0x000000ff) { |
| case 0x25: |
| return handle_stctg(vcpu); |
| case 0x2f: |
| return handle_lctlg(vcpu); |
| case 0x60: |
| case 0x61: |
| case 0x62: |
| return handle_ri(vcpu); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| static int handle_tprot(struct kvm_vcpu *vcpu) |
| { |
| u64 address, operand2; |
| unsigned long gpa; |
| u8 access_key; |
| bool writable; |
| int ret, cc; |
| u8 ar; |
| |
| vcpu->stat.instruction_tprot++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL); |
| access_key = (operand2 & 0xf0) >> 4; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) |
| ipte_lock(vcpu->kvm); |
| |
| ret = guest_translate_address_with_key(vcpu, address, ar, &gpa, |
| GACC_STORE, access_key); |
| if (ret == 0) { |
| gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); |
| } else if (ret == PGM_PROTECTION) { |
| writable = false; |
| /* Write protected? Try again with read-only... */ |
| ret = guest_translate_address_with_key(vcpu, address, ar, &gpa, |
| GACC_FETCH, access_key); |
| } |
| if (ret >= 0) { |
| cc = -1; |
| |
| /* Fetching permitted; storing permitted */ |
| if (ret == 0 && writable) |
| cc = 0; |
| /* Fetching permitted; storing not permitted */ |
| else if (ret == 0 && !writable) |
| cc = 1; |
| /* Fetching not permitted; storing not permitted */ |
| else if (ret == PGM_PROTECTION) |
| cc = 2; |
| /* Translation not available */ |
| else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC) |
| cc = 3; |
| |
| if (cc != -1) { |
| kvm_s390_set_psw_cc(vcpu, cc); |
| ret = 0; |
| } else { |
| ret = kvm_s390_inject_program_int(vcpu, ret); |
| } |
| } |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) |
| ipte_unlock(vcpu->kvm); |
| return ret; |
| } |
| |
| int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) |
| { |
| switch (vcpu->arch.sie_block->ipa & 0x00ff) { |
| case 0x01: |
| return handle_tprot(vcpu); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| static int handle_sckpf(struct kvm_vcpu *vcpu) |
| { |
| u32 value; |
| |
| vcpu->stat.instruction_sckpf++; |
| |
| if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) |
| return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); |
| |
| if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) |
| return kvm_s390_inject_program_int(vcpu, |
| PGM_SPECIFICATION); |
| |
| value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; |
| vcpu->arch.sie_block->todpr = value; |
| |
| return 0; |
| } |
| |
| static int handle_ptff(struct kvm_vcpu *vcpu) |
| { |
| vcpu->stat.instruction_ptff++; |
| |
| /* we don't emulate any control instructions yet */ |
| kvm_s390_set_psw_cc(vcpu, 3); |
| return 0; |
| } |
| |
| int kvm_s390_handle_01(struct kvm_vcpu *vcpu) |
| { |
| switch (vcpu->arch.sie_block->ipa & 0x00ff) { |
| case 0x04: |
| return handle_ptff(vcpu); |
| case 0x07: |
| return handle_sckpf(vcpu); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |