diff options
Diffstat (limited to 'arch/s390/kvm/priv.c')
| -rw-r--r-- | arch/s390/kvm/priv.c | 1397 |
1 files changed, 1120 insertions, 277 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 0da3e6eb6be6..0b14d894f38a 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -1,11 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 /* * handling privileged instructions * - * Copyright IBM Corp. 2008, 2013 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License (version 2 only) - * as published by the Free Software Foundation. + * Copyright IBM Corp. 2008, 2020 * * Author(s): Carsten Otte <cotte@de.ibm.com> * Christian Borntraeger <borntraeger@de.ibm.com> @@ -14,52 +11,148 @@ #include <linux/kvm.h> #include <linux/gfp.h> #include <linux/errno.h> -#include <linux/compat.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/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/io.h> +#include <asm/page-states.h> +#include <asm/gmap.h> #include <asm/ptrace.h> -#include <asm/compat.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 = 0; - u8 tmp; + 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); + 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 */ - if (get_guest(vcpu, address, (u32 __user *) operand2)) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); - address = address & 0x7fffe000u; + address &= 0x7fffe000u; - /* make sure that the new value is valid memory */ - if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || - (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) + /* + * 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_gpa_in_memslot(vcpu->kvm, address)) return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); kvm_s390_set_prefix(vcpu, address); - - VCPU_EVENT(vcpu, 5, "setting prefix to %x", address); trace_kvm_s390_handle_prefix(vcpu, 1, address); return 0; } @@ -68,112 +161,399 @@ 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); + 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 = vcpu->arch.sie_block->prefix; - address = address & 0x7fffe000u; + address = kvm_s390_get_prefix(vcpu); /* get the value */ - if (put_guest(vcpu, address, (u32 __user *)operand2)) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); - VCPU_EVENT(vcpu, 5, "storing prefix to %x", address); + 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) { - u64 useraddr; + 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); - useraddr = kvm_s390_get_base_disp_s(vcpu); + ga = kvm_s390_get_base_disp_s(vcpu, &ar); - if (useraddr & 1) + if (ga & 1) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr)) + 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; +} - VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr); - trace_kvm_s390_handle_stap(vcpu, useraddr); +#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_skey(struct kvm_vcpu *vcpu) +static int handle_test_block(struct kvm_vcpu *vcpu) { - vcpu->stat.instruction_storage_key++; + 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); - vcpu->arch.sie_block->gpsw.addr = - __rewind_psw(vcpu->arch.sie_block->gpsw, 4); - VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); + 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_gpa_in_memslot(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; - int cc; + u8 ar; + + vcpu->stat.instruction_tpi++; - addr = kvm_s390_get_base_disp_s(vcpu); + addr = kvm_s390_get_base_disp_s(vcpu, &ar); if (addr & 3) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - cc = 0; - inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0); - if (!inti) - goto no_interrupt; - cc = 1; + + 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. */ - if (put_guest(vcpu, inti->io.subchannel_id, (u16 __user *)addr) - || put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *)(addr + 2)) - || put_guest(vcpu, inti->io.io_int_parm, (u32 __user *)(addr + 4))) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + 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. */ - put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID); - put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR); - put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM); - put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD); + 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); -no_interrupt: - /* Set condition code and we're done. */ - vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); - vcpu->arch.sie_block->gpsw.mask |= (cc & 3ul) << 44; + 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; + struct kvm_s390_interrupt_info *inti = NULL; + const u64 isc_mask = 0xffUL << 24; /* all iscs set */ - inti = kvm_s390_get_io_int(vcpu->kvm, 0, - vcpu->run->s.regs.gprs[1]); + 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. @@ -213,45 +593,140 @@ static int handle_io_inst(struct kvm_vcpu *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 issueing channel + * Set condition code 3 to stop the guest from issuing channel * I/O instructions. */ - vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); - vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; + kvm_s390_set_psw_cc(vcpu, 3); return 0; } } -static int handle_stfl(struct kvm_vcpu *vcpu) +#if IS_ENABLED(CONFIG_VFIO_AP) +bool kvm_s390_is_gpa_in_memslot(struct kvm *kvm, gpa_t gpa) { - unsigned int facility_list; - int rc; + return kvm_is_gpa_in_memslot(kvm, gpa); +} +EXPORT_SYMBOL_FOR_MODULES(kvm_s390_is_gpa_in_memslot, "vfio_ap"); +#endif - vcpu->stat.instruction_stfl++; +/* + * 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); - /* only pass the facility bits, which we can handle */ - facility_list = S390_lowcore.stfl_fac_list & 0xff82fff3; + /* 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); - rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list), - &facility_list, sizeof(facility_list)); - if (rc) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); - VCPU_EVENT(vcpu, 5, "store facility list value %x", facility_list); - trace_kvm_s390_handle_stfl(vcpu, facility_list); + /* 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 void handle_new_psw(struct kvm_vcpu *vcpu) +static int handle_stfl(struct kvm_vcpu *vcpu) { - /* Check whether the new psw is enabled for machine checks. */ - if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK) - kvm_s390_deliver_pending_machine_checks(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) @@ -259,7 +734,8 @@ static void handle_new_psw(struct kvm_vcpu *vcpu) #define PSW_ADDR_24 0x0000000000ffffffUL #define PSW_ADDR_31 0x000000007fffffffUL -static int is_valid_psw(psw_t *psw) { +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) { @@ -270,23 +746,31 @@ static int is_valid_psw(psw_t *psw) { 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; + psw32_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); + addr = kvm_s390_get_base_disp_s(vcpu, &ar); if (addr & 7) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + 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; @@ -294,7 +778,6 @@ int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; if (!is_valid_psw(gpsw)) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - handle_new_psw(vcpu); return 0; } @@ -302,54 +785,87 @@ 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); + addr = kvm_s390_get_base_disp_s(vcpu, &ar); if (addr & 7) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + 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); - handle_new_psw(vcpu); + return 0; +} + +static int handle_lpswey(struct kvm_vcpu *vcpu) +{ + psw_t new_psw; + u64 addr; + int rc; + u8 ar; + + vcpu->stat.instruction_lpswey++; + + if (!test_kvm_facility(vcpu->kvm, 193)) + 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); + + addr = kvm_s390_get_base_disp_siy(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); + operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); if (operand2 & 7) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2)) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); - VCPU_EVENT(vcpu, 5, "%s", "store cpu id"); + 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) { - struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; int cpus = 0; int n; - spin_lock(&fi->lock); - for (n = 0; n < KVM_MAX_VCPUS; n++) - if (fi->local_int[n]) - cpus++; - spin_unlock(&fi->lock); + cpus = atomic_read(&vcpu->kvm->online_vcpus); /* deal with other level 3 hypervisors */ if (stsi(mem, 3, 2, 2)) @@ -359,6 +875,7 @@ static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 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; @@ -370,6 +887,17 @@ static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 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; @@ -378,17 +906,26 @@ static int handle_stsi(struct kvm_vcpu *vcpu) unsigned long mem = 0; u64 operand2; int rc = 0; + u8 ar; vcpu->stat.instruction_stsi++; - VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2); + 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); - if (fc > 3) { - vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; /* cc 3 */ - return 0; - } + /* 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) @@ -396,19 +933,19 @@ static int handle_stsi(struct kvm_vcpu *vcpu) if (fc == 0) { vcpu->run->s.regs.gprs[0] = 3 << 28; - vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); /* cc 0 */ + kvm_s390_set_psw_cc(vcpu, 0); return 0; } - operand2 = kvm_s390_get_base_disp_s(vcpu); + operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); - if (operand2 & 0xfff) + 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); + mem = get_zeroed_page(GFP_KERNEL_ACCOUNT); if (!mem) goto out_no_data; if (stsi((void *) mem, fc, sel1, sel2)) @@ -417,88 +954,115 @@ static int handle_stsi(struct kvm_vcpu *vcpu) case 3: if (sel1 != 2 || sel2 != 2) goto out_no_data; - mem = get_zeroed_page(GFP_KERNEL); + 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 (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) { - rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); - goto out_exception; + 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); - vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); + kvm_s390_set_psw_cc(vcpu, 0); vcpu->run->s.regs.gprs[0] = 0; - return 0; + return rc; out_no_data: - /* condition code 3 */ - vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; -out_exception: + kvm_s390_set_psw_cc(vcpu, 3); +out: free_page(mem); return rc; } -static const intercept_handler_t b2_handlers[256] = { - [0x02] = handle_stidp, - [0x10] = handle_set_prefix, - [0x11] = handle_store_prefix, - [0x12] = handle_store_cpu_address, - [0x29] = handle_skey, - [0x2a] = handle_skey, - [0x2b] = handle_skey, - [0x30] = handle_io_inst, - [0x31] = handle_io_inst, - [0x32] = handle_io_inst, - [0x33] = handle_io_inst, - [0x34] = handle_io_inst, - [0x35] = handle_io_inst, - [0x36] = handle_io_inst, - [0x37] = handle_io_inst, - [0x38] = handle_io_inst, - [0x39] = handle_io_inst, - [0x3a] = handle_io_inst, - [0x3b] = handle_io_inst, - [0x3c] = handle_io_inst, - [0x5f] = handle_io_inst, - [0x74] = handle_io_inst, - [0x76] = handle_io_inst, - [0x7d] = handle_stsi, - [0xb1] = handle_stfl, - [0xb2] = handle_lpswe, -}; - int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) { - intercept_handler_t handler; - - /* - * A lot of B2 instructions are priviledged. Here we check for - * the privileged ones, that we can handle in the kernel. - * Anything else goes to userspace. - */ - handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; - if (handler) - return handler(vcpu); - - return -EOPNOTSUPP; + 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] &= 0xffffffff00000000; + 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] &= 0xffffffff00000000; + vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; vcpu->run->s.regs.gprs[reg2] |= - vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff; + vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; } return 0; } @@ -515,14 +1079,16 @@ static int handle_epsw(struct kvm_vcpu *vcpu) 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 (!MACHINE_HAS_PFMF) + 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) @@ -531,219 +1097,489 @@ static int handle_pfmf(struct kvm_vcpu *vcpu) if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - /* Only provide non-quiescing support if the host supports it */ + /* Only provide non-quiescing support if enabled for the guest */ if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && - S390_lowcore.stfl_fac_list & 0x00020000) + !test_kvm_facility(vcpu->kvm, 14)) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - /* No support for conditional-SSKE */ - if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC)) - 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: - end = (start + (1UL << 12)) & ~((1UL << 12) - 1); + /* 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 + (1UL << 20)) & ~((1UL << 20) - 1); + end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); break; - /* We dont support EDAT2 case 0x00002000: - end = (start + (1UL << 31)) & ~((1UL << 31) - 1); - break;*/ + /* 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 useraddr; - useraddr = gmap_translate(start, vcpu->arch.gmap); - if (IS_ERR((void *)useraddr)) + 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 (clear_user((void __user *)useraddr, PAGE_SIZE)) + 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) { - if (set_guest_storage_key(current->mm, useraddr, - vcpu->run->s.regs.gprs[reg1] & PFMF_KEY, - vcpu->run->s.regs.gprs[reg1] & PFMF_NQ)) + 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) - vcpu->run->s.regs.gprs[reg2] = end; + 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; } -static const intercept_handler_t b9_handlers[256] = { - [0x8d] = handle_epsw, - [0x9c] = handle_io_inst, - [0xaf] = handle_pfmf, -}; +/* + * 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 + */ -int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) + 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) { - intercept_handler_t handler; + lockdep_assert_held(&vcpu->kvm->srcu); + + /* 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); - /* This is handled just as for the B2 instructions. */ - handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; - if (handler) - return handler(vcpu); + 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 { + mmap_read_lock(vcpu->kvm->mm); + i = __do_essa(vcpu, orc); + 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; +} - return -EOPNOTSUPP; +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; - u64 useraddr; - u32 val = 0; - int reg, rc; + 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); - useraddr = kvm_s390_get_base_disp_rs(vcpu); + ga = kvm_s390_get_base_disp_rs(vcpu, &ar); - if (useraddr & 3) + if (ga & 3) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3, - useraddr); - trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr); + 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 { - rc = get_guest(vcpu, val, (u32 __user *) useraddr); - if (rc) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; - vcpu->arch.sie_block->gcr[reg] |= val; - useraddr += 4; + 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_lctlg(struct kvm_vcpu *vcpu) +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; - u64 useraddr; - int reg, rc; + int reg, rc, nr_regs; + u32 ctl_array[16]; + u64 ga; + u8 ar; - vcpu->stat.instruction_lctlg++; + vcpu->stat.instruction_stctl++; if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); - useraddr = kvm_s390_get_base_disp_rsy(vcpu); + ga = kvm_s390_get_base_disp_rs(vcpu, &ar); - if (useraddr & 7) + 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, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3, - useraddr); - trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr); + 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 { - rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg], - (u64 __user *) useraddr); - if (rc) - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); - useraddr += 8; + 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 const intercept_handler_t eb_handlers[256] = { - [0x2f] = handle_lctlg, - [0x8a] = handle_io_inst, -}; +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) { - intercept_handler_t handler; - - handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff]; - if (handler) - return handler(vcpu); - return -EOPNOTSUPP; + 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); + case 0x71: + return handle_lpswey(vcpu); + default: + return -EOPNOTSUPP; + } } static int handle_tprot(struct kvm_vcpu *vcpu) { - u64 address1, address2; - struct vm_area_struct *vma; - unsigned long user_address; + 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, &address1, &address2); + kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL); + access_key = (operand2 & 0xf0) >> 4; - /* we only handle the Linux memory detection case: - * access key == 0 - * guest DAT == off - * everything else goes to userspace. */ - if (address2 & 0xf0) - return -EOPNOTSUPP; if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) - return -EOPNOTSUPP; - - down_read(¤t->mm->mmap_sem); - user_address = __gmap_translate(address1, vcpu->arch.gmap); - if (IS_ERR_VALUE(user_address)) - goto out_inject; - vma = find_vma(current->mm, user_address); - if (!vma) - goto out_inject; - vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); - if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ)) - vcpu->arch.sie_block->gpsw.mask |= (1ul << 44); - if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ)) - vcpu->arch.sie_block->gpsw.mask |= (2ul << 44); - - up_read(¤t->mm->mmap_sem); - return 0; + 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); + } + } -out_inject: - up_read(¤t->mm->mmap_sem); - return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + 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) { - /* For e5xx... instructions we only handle TPROT */ - if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01) + switch (vcpu->arch.sie_block->ipa & 0x00ff) { + case 0x01: return handle_tprot(vcpu); - return -EOPNOTSUPP; + 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); @@ -757,16 +1593,23 @@ static int handle_sckpf(struct kvm_vcpu *vcpu) return 0; } -static const intercept_handler_t x01_handlers[256] = { - [0x07] = handle_sckpf, -}; +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) { - intercept_handler_t handler; - - handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; - if (handler) - return handler(vcpu); - return -EOPNOTSUPP; + switch (vcpu->arch.sie_block->ipa & 0x00ff) { + case 0x04: + return handle_ptff(vcpu); + case 0x07: + return handle_sckpf(vcpu); + default: + return -EOPNOTSUPP; + } } |