diff options
Diffstat (limited to 'arch/s390/kvm/priv.c')
| -rw-r--r-- | arch/s390/kvm/priv.c | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c new file mode 100644 index 00000000..6bbd7b5a --- /dev/null +++ b/arch/s390/kvm/priv.c @@ -0,0 +1,588 @@ +/* + * handling privileged instructions + * + * Copyright IBM Corp. 2008 + * + * 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. + * + * 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/compat.h> +#include <asm/asm-offsets.h> +#include <asm/current.h> +#include <asm/debug.h> +#include <asm/ebcdic.h> +#include <asm/sysinfo.h> +#include <asm/ptrace.h> +#include <asm/compat.h> +#include "gaccess.h" +#include "kvm-s390.h" +#include "trace.h" + +static int handle_set_prefix(struct kvm_vcpu *vcpu) +{ + u64 operand2; + u32 address = 0; + u8 tmp; + + vcpu->stat.instruction_spx++; + + operand2 = kvm_s390_get_base_disp_s(vcpu); + + /* 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); + + address = 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))) + 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; +} + +static int handle_store_prefix(struct kvm_vcpu *vcpu) +{ + u64 operand2; + u32 address; + + vcpu->stat.instruction_stpx++; + + operand2 = kvm_s390_get_base_disp_s(vcpu); + + /* 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; + + /* get the value */ + if (put_guest(vcpu, address, (u32 __user *)operand2)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + VCPU_EVENT(vcpu, 5, "storing prefix to %x", address); + trace_kvm_s390_handle_prefix(vcpu, 0, address); + return 0; +} + +static int handle_store_cpu_address(struct kvm_vcpu *vcpu) +{ + u64 useraddr; + + vcpu->stat.instruction_stap++; + + useraddr = kvm_s390_get_base_disp_s(vcpu); + + if (useraddr & 1) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr); + trace_kvm_s390_handle_stap(vcpu, useraddr); + return 0; +} + +static int handle_skey(struct kvm_vcpu *vcpu) +{ + vcpu->stat.instruction_storage_key++; + vcpu->arch.sie_block->gpsw.addr -= 4; + VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); + return 0; +} + +static int handle_tpi(struct kvm_vcpu *vcpu) +{ + struct kvm_s390_interrupt_info *inti; + u64 addr; + int cc; + + addr = kvm_s390_get_base_disp_s(vcpu); + 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; + if (addr) { + /* + * Store the two-word I/O interruption code into the + * provided area. + */ + 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)); + } 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); + } + 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; + return 0; +} + +static int handle_tsch(struct kvm_vcpu *vcpu) +{ + struct kvm_s390_interrupt_info *inti; + + inti = kvm_s390_get_io_int(vcpu->kvm, 0, + 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->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. */ + return -EOPNOTSUPP; + } else { + /* + * Set condition code 3 to stop the guest from issueing channel + * I/O instructions. + */ + vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); + vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; + return 0; + } +} + +static int handle_stfl(struct kvm_vcpu *vcpu) +{ + unsigned int facility_list; + int rc; + + vcpu->stat.instruction_stfl++; + /* only pass the facility bits, which we can handle */ + facility_list = S390_lowcore.stfl_fac_list & 0xff00fff3; + + 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); + return 0; +} + +static void handle_new_psw(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); +} + +#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 + +static 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; + 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; + + if (gpsw->mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, + PGM_PRIVILEGED_OPERATION); + addr = kvm_s390_get_base_disp_s(vcpu); + 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); + 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); + handle_new_psw(vcpu); + return 0; +} + +static int handle_lpswe(struct kvm_vcpu *vcpu) +{ + psw_t new_psw; + u64 addr; + + addr = kvm_s390_get_base_disp_s(vcpu); + 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); + 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_stidp(struct kvm_vcpu *vcpu) +{ + u64 operand2; + + vcpu->stat.instruction_stidp++; + + operand2 = kvm_s390_get_base_disp_s(vcpu); + + 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); + + VCPU_EVENT(vcpu, 5, "%s", "store cpu id"); + 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); + + /* 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])); + + 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 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; + + vcpu->stat.instruction_stsi++; + VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2); + + operand2 = kvm_s390_get_base_disp_s(vcpu); + + if (operand2 & 0xfff && fc > 0) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + switch (fc) { + case 0: + vcpu->run->s.regs.gprs[0] = 3 << 28; + vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); + return 0; + case 1: /* same handling for 1 and 2 */ + case 2: + mem = get_zeroed_page(GFP_KERNEL); + 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); + if (!mem) + goto out_no_data; + handle_stsi_3_2_2(vcpu, (void *) mem); + break; + default: + goto out_no_data; + } + + if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) { + rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + goto out_exception; + } + trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); + free_page(mem); + vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); + vcpu->run->s.regs.gprs[0] = 0; + return 0; +out_no_data: + /* condition code 3 */ + vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; +out_exception: + 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. We first check for + * the privileged ones, that we can handle in the kernel. If the + * kernel can handle this instruction, we check for the problem + * state bit and (a) handle the instruction or (b) send a code 2 + * program check. + * Anything else goes to userspace.*/ + handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; + if (handler) { + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, + PGM_PRIVILEGED_OPERATION); + else + return handler(vcpu); + } + return -EOPNOTSUPP; +} + +static int handle_epsw(struct kvm_vcpu *vcpu) +{ + int reg1, reg2; + + reg1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 24; + reg2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16; + + /* This basically extracts the mask half of the psw. */ + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000; + 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] |= + vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff; + } + return 0; +} + +static const intercept_handler_t b9_handlers[256] = { + [0x8d] = handle_epsw, + [0x9c] = handle_io_inst, +}; + +int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) +{ + intercept_handler_t handler; + + /* This is handled just as for the B2 instructions. */ + handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; + if (handler) { + if ((handler != handle_epsw) && + (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)) + return kvm_s390_inject_program_int(vcpu, + PGM_PRIVILEGED_OPERATION); + else + return handler(vcpu); + } + return -EOPNOTSUPP; +} + +static const intercept_handler_t eb_handlers[256] = { + [0x8a] = handle_io_inst, +}; + +int kvm_s390_handle_priv_eb(struct kvm_vcpu *vcpu) +{ + intercept_handler_t handler; + + /* All eb instructions that end up here are privileged. */ + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, + PGM_PRIVILEGED_OPERATION); + handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff]; + if (handler) + return handler(vcpu); + return -EOPNOTSUPP; +} + +static int handle_tprot(struct kvm_vcpu *vcpu) +{ + u64 address1, address2; + struct vm_area_struct *vma; + unsigned long user_address; + + vcpu->stat.instruction_tprot++; + + kvm_s390_get_base_disp_sse(vcpu, &address1, &address2); + + /* 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; + +out_inject: + up_read(¤t->mm->mmap_sem); + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); +} + +int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) +{ + /* For e5xx... instructions we only handle TPROT */ + if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01) + return handle_tprot(vcpu); + return -EOPNOTSUPP; +} + +static int handle_sckpf(struct kvm_vcpu *vcpu) +{ + u32 value; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, + PGM_PRIVILEGED_OPERATION); + + 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 const intercept_handler_t x01_handlers[256] = { + [0x07] = handle_sckpf, +}; + +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; +} |