/*
   * 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.
   *
   *    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/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/ptrace.h>
  #include <asm/compat.h>
  #include "gaccess.h"
  #include "kvm-s390.h"
  #include "trace.h"
  
  /* Handle SCK (SET CLOCK) interception */
  static int handle_set_clock(struct kvm_vcpu *vcpu)
  {
  	struct kvm_vcpu *cpup;
  	s64 hostclk, val;
  	u64 op2;
  	int i;
  
  	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);
  	if (op2 & 7)	/* Operand must be on a doubleword boundary */
  		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  	if (get_guest(vcpu, val, (u64 __user *) op2))
  		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  
  	if (store_tod_clock(&hostclk)) {
  		kvm_s390_set_psw_cc(vcpu, 3);
  		return 0;
  	}
  	val = (val - hostclk) & ~0x3fUL;
  
  	mutex_lock(&vcpu->kvm->lock);
  	kvm_for_each_vcpu(i, cpup, vcpu->kvm)
  		cpup->arch.sie_block->epoch = val;
  	mutex_unlock(&vcpu->kvm->lock);
  
  	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;
  
  	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);
  
  	/* 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++;
  
  	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);
  
  	/* 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++;
  
  	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);
  
  	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++;
  
  	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");
  	return 0;
  }
  
  static int handle_test_block(struct kvm_vcpu *vcpu)
  {
  	unsigned long hva;
  	gpa_t addr;
  	int reg2;
  
  	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, &reg2);
  	addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
  	addr = kvm_s390_real_to_abs(vcpu, addr);
  
  	hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
  	if (kvm_is_error_hva(hva))
  		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 (clear_user((void __user *)hva, PAGE_SIZE) != 0)
  		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;
  	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->arch.sie_block->gcr[6], 0);
  	if (!inti)
  		goto no_interrupt;
  	cc = 1;
  	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);
  	} 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. */
  	kvm_s390_set_psw_cc(vcpu, cc);
  	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->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. */
  		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;
  	}
  }
  
  static int handle_stfl(struct kvm_vcpu *vcpu)
  {
  	int rc;
  
  	vcpu->stat.instruction_stfl++;
  
  	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  
  	rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
  			   vfacilities, 4);
  	if (rc)
  		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  	VCPU_EVENT(vcpu, 5, "store facility list value %x",
  		   *(unsigned int *) vfacilities);
  	trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
  	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_OP);
  
  	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;
  
  	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);
  	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++;
  
  	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);
  
  	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);
  
  	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  
  	if (fc > 3) {
  		kvm_s390_set_psw_cc(vcpu, 3);
  		return 0;
  	}
  
  	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);
  
  	if (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);
  		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;
  	}
  
  	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);
  	kvm_s390_set_psw_cc(vcpu, 0);
  	vcpu->run->s.regs.gprs[0] = 0;
  	return 0;
  out_no_data:
  	kvm_s390_set_psw_cc(vcpu, 3);
  out_exception:
  	free_page(mem);
  	return rc;
  }
  
  static const intercept_handler_t b2_handlers[256] = {
  	[0x02] = handle_stidp,
  	[0x04] = handle_set_clock,
  	[0x10] = handle_set_prefix,
  	[0x11] = handle_store_prefix,
  	[0x12] = handle_store_cpu_address,
  	[0x29] = handle_skey,
  	[0x2a] = handle_skey,
  	[0x2b] = handle_skey,
  	[0x2c] = handle_test_block,
  	[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;
  }
  
  static int handle_epsw(struct kvm_vcpu *vcpu)
  {
  	int reg1, reg2;
  
  	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
  
  	/* 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)
  {
  	int reg1, reg2;
  	unsigned long start, end;
  
  	vcpu->stat.instruction_pfmf++;
  
  	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
  
  	if (!MACHINE_HAS_PFMF)
  		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 the host supports it */
  	if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(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);
  
  	start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
  	switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
  	case 0x00000000:
  		end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
  		break;
  	case 0x00001000:
  		end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
  		break;
  	/* We dont support EDAT2
  	case 0x00002000:
  		end = (start + (1UL << 31)) & ~((1UL << 31) - 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))
  			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))
  				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))
  				return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  		}
  
  		start += PAGE_SIZE;
  	}
  	if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
  		vcpu->run->s.regs.gprs[reg2] = end;
  	return 0;
  }
  
  static const intercept_handler_t b9_handlers[256] = {
  	[0x8d] = handle_epsw,
  	[0xaf] = handle_pfmf,
  };
  
  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)
  		return handler(vcpu);
  
  	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;
  
  	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);
  
  	if (useraddr & 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);
  
  	reg = reg1;
  	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;
  		if (reg == reg3)
  			break;
  		reg = (reg + 1) % 16;
  	} while (1);
  
  	return 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;
  	u64 useraddr;
  	int reg, rc;
  
  	vcpu->stat.instruction_lctlg++;
  
  	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);
  
  	if (useraddr & 7)
  		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  
  	reg = reg1;
  
  	VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
  		   useraddr);
  	trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
  
  	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;
  		if (reg == reg3)
  			break;
  		reg = (reg + 1) % 16;
  	} while (1);
  
  	return 0;
  }
  
  static const intercept_handler_t eb_handlers[256] = {
  	[0x2f] = handle_lctlg,
  };
  
  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;
  }
  
  static int handle_tprot(struct kvm_vcpu *vcpu)
  {
  	u64 address1, address2;
  	struct vm_area_struct *vma;
  	unsigned long user_address;
  
  	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);
  
  	/* 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(&current->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(&current->mm->mmap_sem);
  	return 0;
  
  out_inject:
  	up_read(&current->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_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 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;
  }