Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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orangepi/linux-orangepi-5.10.y.git/trunk/arch/s390/kvm/priv.c
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// SPDX-License-Identifier: GPL-2.0
/*
 * handling privileged instructions
 *
 * Copyright IBM Corp. 2008, 2020
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 */
 
#include <linux/kvm.h>
#include <linux/gfp.h>
#include <linux/errno.h>
#include <linux/compat.h>
#include <linux/mm_types.h>
#include <linux/pgtable.h>
 
#include <asm/asm-offsets.h>
#include <asm/facility.h>
#include <asm/current.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
#include <asm/page-states.h>
#include <asm/gmap.h>
#include <asm/io.h>
#include <asm/ptrace.h>
#include <asm/sclp.h>
#include <asm/ap.h>
#include "gaccess.h"
#include "kvm-s390.h"
#include "trace.h"
 
static int handle_ri(struct kvm_vcpu *vcpu)
{
<------>vcpu->stat.instruction_ri++;
 
<------>if (test_kvm_facility(vcpu->kvm, 64)) {
<------><------>VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
<------><------>vcpu->arch.sie_block->ecb3 |= ECB3_RI;
<------><------>kvm_s390_retry_instr(vcpu);
<------><------>return 0;
<------>} else
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
}
 
int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
{
<------>if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
<------><------>return handle_ri(vcpu);
<------>else
<------><------>return -EOPNOTSUPP;
}
 
static int handle_gs(struct kvm_vcpu *vcpu)
{
<------>vcpu->stat.instruction_gs++;
 
<------>if (test_kvm_facility(vcpu->kvm, 133)) {
<------><------>VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
<------><------>preempt_disable();
<------><------>__ctl_set_bit(2, 4);
<------><------>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, &gtod.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);
<------>kvm_s390_set_tod_clock(vcpu->kvm, &gtod);
 
<------>kvm_s390_set_psw_cc(vcpu, 0);
<------>return 0;
}
 
static int handle_set_prefix(struct kvm_vcpu *vcpu)
{
<------>u64 operand2;
<------>u32 address;
<------>int rc;
<------>u8 ar;
 
<------>vcpu->stat.instruction_spx++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 
<------>/* must be word boundary */
<------>if (operand2 & 3)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>/* get the value */
<------>rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
 
<------>address &= 0x7fffe000u;
 
<------>/*
<------> * Make sure the new value is valid memory. We only need to check the
<------> * first page, since address is 8k aligned and memory pieces are always
<------> * at least 1MB aligned and have at least a size of 1MB.
<------> */
<------>if (kvm_is_error_gpa(vcpu->kvm, address))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 
<------>kvm_s390_set_prefix(vcpu, address);
<------>trace_kvm_s390_handle_prefix(vcpu, 1, address);
<------>return 0;
}
 
static int handle_store_prefix(struct kvm_vcpu *vcpu)
{
<------>u64 operand2;
<------>u32 address;
<------>int rc;
<------>u8 ar;
 
<------>vcpu->stat.instruction_stpx++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 
<------>/* must be word boundary */
<------>if (operand2 & 3)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>address = kvm_s390_get_prefix(vcpu);
 
<------>/* get the value */
<------>rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
 
<------>VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
<------>trace_kvm_s390_handle_prefix(vcpu, 0, address);
<------>return 0;
}
 
static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
{
<------>u16 vcpu_id = vcpu->vcpu_id;
<------>u64 ga;
<------>int rc;
<------>u8 ar;
 
<------>vcpu->stat.instruction_stap++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 
<------>if (ga & 1)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
 
<------>VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
<------>trace_kvm_s390_handle_stap(vcpu, ga);
<------>return 0;
}
 
int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
{
<------>int rc;
 
<------>trace_kvm_s390_skey_related_inst(vcpu);
<------>/* Already enabled? */
<------>if (vcpu->arch.skey_enabled)
<------><------>return 0;
 
<------>rc = s390_enable_skey();
<------>VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
<------>if (rc)
<------><------>return rc;
 
<------>if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
<------><------>kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
<------>if (!vcpu->kvm->arch.use_skf)
<------><------>vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
<------>else
<------><------>vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
<------>vcpu->arch.skey_enabled = true;
<------>return 0;
}
 
static int try_handle_skey(struct kvm_vcpu *vcpu)
{
<------>int rc;
 
<------>rc = kvm_s390_skey_check_enable(vcpu);
<------>if (rc)
<------><------>return rc;
<------>if (vcpu->kvm->arch.use_skf) {
<------><------>/* with storage-key facility, SIE interprets it for us */
<------><------>kvm_s390_retry_instr(vcpu);
<------><------>VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
<------><------>return -EAGAIN;
<------>}
<------>return 0;
}
 
static int handle_iske(struct kvm_vcpu *vcpu)
{
<------>unsigned long gaddr, vmaddr;
<------>unsigned char key;
<------>int reg1, reg2;
<------>bool unlocked;
<------>int rc;
 
<------>vcpu->stat.instruction_iske++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>rc = try_handle_skey(vcpu);
<------>if (rc)
<------><------>return rc != -EAGAIN ? rc : 0;
 
<------>kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 
<------>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, &reg1, &reg2);
 
<------>gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
<------>gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
<------>gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
<------>vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
<------>if (kvm_is_error_hva(vmaddr))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
retry:
<------>unlocked = false;
<------>mmap_read_lock(current->mm);
<------>rc = reset_guest_reference_bit(current->mm, vmaddr);
<------>if (rc < 0) {
<------><------>rc = fixup_user_fault(current->mm, vmaddr,
<------><------><------><------>      FAULT_FLAG_WRITE, &unlocked);
<------><------>if (!rc) {
<------><------><------>mmap_read_unlock(current->mm);
<------><------><------>goto retry;
<------><------>}
<------>}
<------>mmap_read_unlock(current->mm);
<------>if (rc == -EFAULT)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
<------>if (rc < 0)
<------><------>return rc;
<------>kvm_s390_set_psw_cc(vcpu, rc);
<------>return 0;
}
 
#define SSKE_NQ 0x8
#define SSKE_MR 0x4
#define SSKE_MC 0x2
#define SSKE_MB 0x1
static int handle_sske(struct kvm_vcpu *vcpu)
{
<------>unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
<------>unsigned long start, end;
<------>unsigned char key, oldkey;
<------>int reg1, reg2;
<------>bool unlocked;
<------>int rc;
 
<------>vcpu->stat.instruction_sske++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>rc = try_handle_skey(vcpu);
<------>if (rc)
<------><------>return rc != -EAGAIN ? rc : 0;
 
<------>if (!test_kvm_facility(vcpu->kvm, 8))
<------><------>m3 &= ~SSKE_MB;
<------>if (!test_kvm_facility(vcpu->kvm, 10))
<------><------>m3 &= ~(SSKE_MC | SSKE_MR);
<------>if (!test_kvm_facility(vcpu->kvm, 14))
<------><------>m3 &= ~SSKE_NQ;
 
<------>kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 
<------>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_s390_retry_instr(vcpu);
<------>VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
<------>return 0;
}
 
static int handle_test_block(struct kvm_vcpu *vcpu)
{
<------>gpa_t addr;
<------>int reg2;
 
<------>vcpu->stat.instruction_tb++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
<------>addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
<------>addr = kvm_s390_logical_to_effective(vcpu, addr);
<------>if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
<------><------>return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
<------>addr = kvm_s390_real_to_abs(vcpu, addr);
 
<------>if (kvm_is_error_gpa(vcpu->kvm, addr))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
<------>/*
<------> * We don't expect errors on modern systems, and do not care
<------> * about storage keys (yet), so let's just clear the page.
<------> */
<------>if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
<------><------>return -EFAULT;
<------>kvm_s390_set_psw_cc(vcpu, 0);
<------>vcpu->run->s.regs.gprs[0] = 0;
<------>return 0;
}
 
static int handle_tpi(struct kvm_vcpu *vcpu)
{
<------>struct kvm_s390_interrupt_info *inti;
<------>unsigned long len;
<------>u32 tpi_data[3];
<------>int rc;
<------>u64 addr;
<------>u8 ar;
 
<------>vcpu->stat.instruction_tpi++;
 
<------>addr = kvm_s390_get_base_disp_s(vcpu, &ar);
<------>if (addr & 3)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
<------>if (!inti) {
<------><------>kvm_s390_set_psw_cc(vcpu, 0);
<------><------>return 0;
<------>}
 
<------>tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
<------>tpi_data[1] = inti->io.io_int_parm;
<------>tpi_data[2] = inti->io.io_int_word;
<------>if (addr) {
<------><------>/*
<------><------> * Store the two-word I/O interruption code into the
<------><------> * provided area.
<------><------> */
<------><------>len = sizeof(tpi_data) - 4;
<------><------>rc = write_guest(vcpu, addr, ar, &tpi_data, len);
<------><------>if (rc) {
<------><------><------>rc = kvm_s390_inject_prog_cond(vcpu, rc);
<------><------><------>goto reinject_interrupt;
<------><------>}
<------>} else {
<------><------>/*
<------><------> * Store the three-word I/O interruption code into
<------><------> * the appropriate lowcore area.
<------><------> */
<------><------>len = sizeof(tpi_data);
<------><------>if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
<------><------><------>/* failed writes to the low core are not recoverable */
<------><------><------>rc = -EFAULT;
<------><------><------>goto reinject_interrupt;
<------><------>}
<------>}
 
<------>/* irq was successfully handed to the guest */
<------>kfree(inti);
<------>kvm_s390_set_psw_cc(vcpu, 1);
<------>return 0;
reinject_interrupt:
<------>/*
<------> * If we encounter a problem storing the interruption code, the
<------> * instruction is suppressed from the guest's view: reinject the
<------> * interrupt.
<------> */
<------>if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
<------><------>kfree(inti);
<------><------>rc = -EFAULT;
<------>}
<------>/* don't set the cc, a pgm irq was injected or we drop to user space */
<------>return rc ? -EFAULT : 0;
}
 
static int handle_tsch(struct kvm_vcpu *vcpu)
{
<------>struct kvm_s390_interrupt_info *inti = NULL;
<------>const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 
<------>vcpu->stat.instruction_tsch++;
 
<------>/* a valid schid has at least one bit set */
<------>if (vcpu->run->s.regs.gprs[1])
<------><------>inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
<------><------><------><------><------>   vcpu->run->s.regs.gprs[1]);
 
<------>/*
<------> * Prepare exit to userspace.
<------> * We indicate whether we dequeued a pending I/O interrupt
<------> * so that userspace can re-inject it if the instruction gets
<------> * a program check. While this may re-order the pending I/O
<------> * interrupts, this is no problem since the priority is kept
<------> * intact.
<------> */
<------>vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
<------>vcpu->run->s390_tsch.dequeued = !!inti;
<------>if (inti) {
<------><------>vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
<------><------>vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
<------><------>vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
<------><------>vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
<------>}
<------>vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
<------>kfree(inti);
<------>return -EREMOTE;
}
 
static int handle_io_inst(struct kvm_vcpu *vcpu)
{
<------>VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>if (vcpu->kvm->arch.css_support) {
<------><------>/*
<------><------> * Most I/O instructions will be handled by userspace.
<------><------> * Exceptions are tpi and the interrupt portion of tsch.
<------><------> */
<------><------>if (vcpu->arch.sie_block->ipa == 0xb236)
<------><------><------>return handle_tpi(vcpu);
<------><------>if (vcpu->arch.sie_block->ipa == 0xb235)
<------><------><------>return handle_tsch(vcpu);
<------><------>/* Handle in userspace. */
<------><------>vcpu->stat.instruction_io_other++;
<------><------>return -EOPNOTSUPP;
<------>} else {
<------><------>/*
<------><------> * Set condition code 3 to stop the guest from issuing channel
<------><------> * I/O instructions.
<------><------> */
<------><------>kvm_s390_set_psw_cc(vcpu, 3);
<------><------>return 0;
<------>}
}
 
/*
 * handle_pqap: Handling pqap interception
 * @vcpu: the vcpu having issue the pqap instruction
 *
 * We now support PQAP/AQIC instructions and we need to correctly
 * answer the guest even if no dedicated driver's hook is available.
 *
 * The intercepting code calls a dedicated callback for this instruction
 * if a driver did register one in the CRYPTO satellite of the
 * SIE block.
 *
 * If no callback is available, the queues are not available, return this
 * response code to the caller and set CC to 3.
 * Else return the response code returned by the callback.
 */
static int handle_pqap(struct kvm_vcpu *vcpu)
{
<------>struct ap_queue_status status = {};
<------>unsigned long reg0;
<------>int ret;
<------>uint8_t fc;
 
<------>/* Verify that the AP instruction are available */
<------>if (!ap_instructions_available())
<------><------>return -EOPNOTSUPP;
<------>/* Verify that the guest is allowed to use AP instructions */
<------>if (!(vcpu->arch.sie_block->eca & ECA_APIE))
<------><------>return -EOPNOTSUPP;
<------>/*
<------> * The only possibly intercepted functions when AP instructions are
<------> * available for the guest are AQIC and TAPQ with the t bit set
<------> * since we do not set IC.3 (FIII) we currently will only intercept
<------> * the AQIC function code.
<------> * Note: running nested under z/VM can result in intercepts for other
<------> * function codes, e.g. PQAP(QCI). We do not support this and bail out.
<------> */
<------>reg0 = vcpu->run->s.regs.gprs[0];
<------>fc = (reg0 >> 24) & 0xff;
<------>if (fc != 0x03)
<------><------>return -EOPNOTSUPP;
 
<------>/* PQAP instruction is allowed for guest kernel only */
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>/* Common PQAP instruction specification exceptions */
<------>/* bits 41-47 must all be zeros */
<------>if (reg0 & 0x007f0000UL)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------>/* APFT not install and T bit set */
<------>if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------>/* APXA not installed and APID greater 64 or APQI greater 16 */
<------>if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>/* AQIC function code specific exception */
<------>/* facility 65 not present for AQIC function code */
<------>if (!test_kvm_facility(vcpu->kvm, 65))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>/*
<------> * Verify that the hook callback is registered, lock the owner
<------> * and call the hook.
<------> */
<------>if (vcpu->kvm->arch.crypto.pqap_hook) {
<------><------>if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner))
<------><------><------>return -EOPNOTSUPP;
<------><------>ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu);
<------><------>module_put(vcpu->kvm->arch.crypto.pqap_hook->owner);
<------><------>if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
<------><------><------>kvm_s390_set_psw_cc(vcpu, 3);
<------><------>return ret;
<------>}
<------>/*
<------> * A vfio_driver must register a hook.
<------> * No hook means no driver to enable the SIE CRYCB and no queues.
<------> * We send this response to the guest.
<------> */
<------>status.response_code = 0x01;
<------>memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
<------>kvm_s390_set_psw_cc(vcpu, 3);
<------>return 0;
}
 
static int handle_stfl(struct kvm_vcpu *vcpu)
{
<------>int rc;
<------>unsigned int fac;
 
<------>vcpu->stat.instruction_stfl++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>/*
<------> * We need to shift the lower 32 facility bits (bit 0-31) from a u64
<------> * into a u32 memory representation. They will remain bits 0-31.
<------> */
<------>fac = *vcpu->kvm->arch.model.fac_list >> 32;
<------>rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
<------><------><------>    &fac, sizeof(fac));
<------>if (rc)
<------><------>return rc;
<------>VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
<------>trace_kvm_s390_handle_stfl(vcpu, fac);
<------>return 0;
}
 
#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
#define PSW_ADDR_24 0x0000000000ffffffUL
#define PSW_ADDR_31 0x000000007fffffffUL
 
int is_valid_psw(psw_t *psw)
{
<------>if (psw->mask & PSW_MASK_UNASSIGNED)
<------><------>return 0;
<------>if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
<------><------>if (psw->addr & ~PSW_ADDR_31)
<------><------><------>return 0;
<------>}
<------>if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
<------><------>return 0;
<------>if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
<------><------>return 0;
<------>if (psw->addr & 1)
<------><------>return 0;
<------>return 1;
}
 
int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
{
<------>psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
<------>psw_compat_t new_psw;
<------>u64 addr;
<------>int rc;
<------>u8 ar;
 
<------>vcpu->stat.instruction_lpsw++;
 
<------>if (gpsw->mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>addr = kvm_s390_get_base_disp_s(vcpu, &ar);
<------>if (addr & 7)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
<------>if (!(new_psw.mask & PSW32_MASK_BASE))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------>gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
<------>gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
<------>gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
<------>if (!is_valid_psw(gpsw))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------>return 0;
}
 
static int handle_lpswe(struct kvm_vcpu *vcpu)
{
<------>psw_t new_psw;
<------>u64 addr;
<------>int rc;
<------>u8 ar;
 
<------>vcpu->stat.instruction_lpswe++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>addr = kvm_s390_get_base_disp_s(vcpu, &ar);
<------>if (addr & 7)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------>rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
<------>vcpu->arch.sie_block->gpsw = new_psw;
<------>if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------>return 0;
}
 
static int handle_stidp(struct kvm_vcpu *vcpu)
{
<------>u64 stidp_data = vcpu->kvm->arch.model.cpuid;
<------>u64 operand2;
<------>int rc;
<------>u8 ar;
 
<------>vcpu->stat.instruction_stidp++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 
<------>if (operand2 & 7)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
 
<------>VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
<------>return 0;
}
 
static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
{
<------>int cpus = 0;
<------>int n;
 
<------>cpus = atomic_read(&vcpu->kvm->online_vcpus);
 
<------>/* deal with other level 3 hypervisors */
<------>if (stsi(mem, 3, 2, 2))
<------><------>mem->count = 0;
<------>if (mem->count < 8)
<------><------>mem->count++;
<------>for (n = mem->count - 1; n > 0 ; n--)
<------><------>memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 
<------>memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
<------>mem->vm[0].cpus_total = cpus;
<------>mem->vm[0].cpus_configured = cpus;
<------>mem->vm[0].cpus_standby = 0;
<------>mem->vm[0].cpus_reserved = 0;
<------>mem->vm[0].caf = 1000;
<------>memcpy(mem->vm[0].name, "KVMguest", 8);
<------>ASCEBC(mem->vm[0].name, 8);
<------>memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
<------>ASCEBC(mem->vm[0].cpi, 16);
}
 
static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
<------><------><------><------> u8 fc, u8 sel1, u16 sel2)
{
<------>vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
<------>vcpu->run->s390_stsi.addr = addr;
<------>vcpu->run->s390_stsi.ar = ar;
<------>vcpu->run->s390_stsi.fc = fc;
<------>vcpu->run->s390_stsi.sel1 = sel1;
<------>vcpu->run->s390_stsi.sel2 = sel2;
}
 
static int handle_stsi(struct kvm_vcpu *vcpu)
{
<------>int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
<------>int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
<------>int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
<------>unsigned long mem = 0;
<------>u64 operand2;
<------>int rc = 0;
<------>u8 ar;
 
<------>vcpu->stat.instruction_stsi++;
<------>VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>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, &ar);
 
<------>if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>switch (fc) {
<------>case 1: /* same handling for 1 and 2 */
<------>case 2:
<------><------>mem = get_zeroed_page(GFP_KERNEL);
<------><------>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 (kvm_s390_pv_cpu_is_protected(vcpu)) {
<------><------>memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
<------><------>       PAGE_SIZE);
<------><------>rc = 0;
<------>} else {
<------><------>rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
<------>}
<------>if (rc) {
<------><------>rc = kvm_s390_inject_prog_cond(vcpu, rc);
<------><------>goto out;
<------>}
<------>if (vcpu->kvm->arch.user_stsi) {
<------><------>insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
<------><------>rc = -EREMOTE;
<------>}
<------>trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
<------>free_page(mem);
<------>kvm_s390_set_psw_cc(vcpu, 0);
<------>vcpu->run->s.regs.gprs[0] = 0;
<------>return rc;
out_no_data:
<------>kvm_s390_set_psw_cc(vcpu, 3);
out:
<------>free_page(mem);
<------>return rc;
}
 
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
{
<------>switch (vcpu->arch.sie_block->ipa & 0x00ff) {
<------>case 0x02:
<------><------>return handle_stidp(vcpu);
<------>case 0x04:
<------><------>return handle_set_clock(vcpu);
<------>case 0x10:
<------><------>return handle_set_prefix(vcpu);
<------>case 0x11:
<------><------>return handle_store_prefix(vcpu);
<------>case 0x12:
<------><------>return handle_store_cpu_address(vcpu);
<------>case 0x14:
<------><------>return kvm_s390_handle_vsie(vcpu);
<------>case 0x21:
<------>case 0x50:
<------><------>return handle_ipte_interlock(vcpu);
<------>case 0x29:
<------><------>return handle_iske(vcpu);
<------>case 0x2a:
<------><------>return handle_rrbe(vcpu);
<------>case 0x2b:
<------><------>return handle_sske(vcpu);
<------>case 0x2c:
<------><------>return handle_test_block(vcpu);
<------>case 0x30:
<------>case 0x31:
<------>case 0x32:
<------>case 0x33:
<------>case 0x34:
<------>case 0x35:
<------>case 0x36:
<------>case 0x37:
<------>case 0x38:
<------>case 0x39:
<------>case 0x3a:
<------>case 0x3b:
<------>case 0x3c:
<------>case 0x5f:
<------>case 0x74:
<------>case 0x76:
<------><------>return handle_io_inst(vcpu);
<------>case 0x56:
<------><------>return handle_sthyi(vcpu);
<------>case 0x7d:
<------><------>return handle_stsi(vcpu);
<------>case 0xaf:
<------><------>return handle_pqap(vcpu);
<------>case 0xb1:
<------><------>return handle_stfl(vcpu);
<------>case 0xb2:
<------><------>return handle_lpswe(vcpu);
<------>default:
<------><------>return -EOPNOTSUPP;
<------>}
}
 
static int handle_epsw(struct kvm_vcpu *vcpu)
{
<------>int reg1, reg2;
 
<------>vcpu->stat.instruction_epsw++;
 
<------>kvm_s390_get_regs_rre(vcpu, &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)
{
<------>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, &reg1, &reg2);
 
<------>if (!test_kvm_facility(vcpu->kvm, 8))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>/* Only provide non-quiescing support if enabled for the guest */
<------>if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
<------>    !test_kvm_facility(vcpu->kvm, 14))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>/* Only provide conditional-SSKE support if enabled for the guest */
<------>if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
<------>    test_kvm_facility(vcpu->kvm, 10)) {
<------><------>mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
<------><------>mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
<------>}
 
<------>nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
<------>key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
<------>start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
<------>start = kvm_s390_logical_to_effective(vcpu, start);
 
<------>if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
<------><------>if (kvm_s390_check_low_addr_prot_real(vcpu, start))
<------><------><------>return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
<------>}
 
<------>switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
<------>case 0x00000000:
<------><------>/* only 4k frames specify a real address */
<------><------>start = kvm_s390_real_to_abs(vcpu, start);
<------><------>end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
<------><------>break;
<------>case 0x00001000:
<------><------>end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
<------><------>break;
<------>case 0x00002000:
<------><------>/* only support 2G frame size if EDAT2 is available and we are
<------><------>   not in 24-bit addressing mode */
<------><------>if (!test_kvm_facility(vcpu->kvm, 78) ||
<------><------>    psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
<------><------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------><------>end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
<------><------>break;
<------>default:
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
<------>}
 
<------>while (start != end) {
<------><------>unsigned long vmaddr;
<------><------>bool unlocked = false;
 
<------><------>/* Translate guest address to host address */
<------><------>vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
<------><------>if (kvm_is_error_hva(vmaddr))
<------><------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 
<------><------>if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
<------><------><------>if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
<------><------><------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
<------><------>}
 
<------><------>if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
<------><------><------>int rc = kvm_s390_skey_check_enable(vcpu);
 
<------><------><------>if (rc)
<------><------><------><------>return rc;
<------><------><------>mmap_read_lock(current->mm);
<------><------><------>rc = cond_set_guest_storage_key(current->mm, vmaddr,
<------><------><------><------><------><------><------>key, NULL, nq, mr, mc);
<------><------><------>if (rc < 0) {
<------><------><------><------>rc = fixup_user_fault(current->mm, vmaddr,
<------><------><------><------><------><------>      FAULT_FLAG_WRITE, &unlocked);
<------><------><------><------>rc = !rc ? -EAGAIN : rc;
<------><------><------>}
<------><------><------>mmap_read_unlock(current->mm);
<------><------><------>if (rc == -EFAULT)
<------><------><------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
<------><------><------>if (rc == -EAGAIN)
<------><------><------><------>continue;
<------><------><------>if (rc < 0)
<------><------><------><------>return rc;
<------><------>}
<------><------>start += PAGE_SIZE;
<------>}
<------>if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
<------><------>if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
<------><------><------>vcpu->run->s.regs.gprs[reg2] = end;
<------><------>} else {
<------><------><------>vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
<------><------><------>end = kvm_s390_logical_to_effective(vcpu, end);
<------><------><------>vcpu->run->s.regs.gprs[reg2] |= end;
<------><------>}
<------>}
<------>return 0;
}
 
/*
 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
 */
static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
{
<------>int r1, r2, nappended, entries;
<------>unsigned long gfn, hva, res, pgstev, ptev;
<------>unsigned long *cbrlo;
 
<------>/*
<------> * We don't need to set SD.FPF.SK to 1 here, because if we have a
<------> * machine check here we either handle it or crash
<------> */
 
<------>kvm_s390_get_regs_rre(vcpu, &r1, &r2);
<------>gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
<------>hva = gfn_to_hva(vcpu->kvm, gfn);
<------>entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
 
<------>if (kvm_is_error_hva(hva))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 
<------>nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
<------>if (nappended < 0) {
<------><------>res = orc ? 0x10 : 0;
<------><------>vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
<------><------>return 0;
<------>}
<------>res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
<------>/*
<------> * Set the block-content state part of the result. 0 means resident, so
<------> * nothing to do if the page is valid. 2 is for preserved pages
<------> * (non-present and non-zero), and 3 for zero pages (non-present and
<------> * zero).
<------> */
<------>if (ptev & _PAGE_INVALID) {
<------><------>res |= 2;
<------><------>if (pgstev & _PGSTE_GPS_ZERO)
<------><------><------>res |= 1;
<------>}
<------>if (pgstev & _PGSTE_GPS_NODAT)
<------><------>res |= 0x20;
<------>vcpu->run->s.regs.gprs[r1] = res;
<------>/*
<------> * It is possible that all the normal 511 slots were full, in which case
<------> * we will now write in the 512th slot, which is reserved for host use.
<------> * In both cases we let the normal essa handling code process all the
<------> * slots, including the reserved one, if needed.
<------> */
<------>if (nappended > 0) {
<------><------>cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
<------><------>cbrlo[entries] = gfn << PAGE_SHIFT;
<------>}
 
<------>if (orc) {
<------><------>struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
 
<------><------>/* Increment only if we are really flipping the bit */
<------><------>if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
<------><------><------>atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
<------>}
 
<------>return nappended;
}
 
static int handle_essa(struct kvm_vcpu *vcpu)
{
<------>/* entries expected to be 1FF */
<------>int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
<------>unsigned long *cbrlo;
<------>struct gmap *gmap;
<------>int i, orc;
 
<------>VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
<------>gmap = vcpu->arch.gmap;
<------>vcpu->stat.instruction_essa++;
<------>if (!vcpu->kvm->arch.use_cmma)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
<------>/* Check for invalid operation request code */
<------>orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
<------>/* ORCs 0-6 are always valid */
<------>if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
<------><------><------><------><------><------>: ESSA_SET_STABLE_IF_RESIDENT))
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>if (!vcpu->kvm->arch.migration_mode) {
<------><------>/*
<------><------> * CMMA is enabled in the KVM settings, but is disabled in
<------><------> * the SIE block and in the mm_context, and we are not doing
<------><------> * a migration. Enable CMMA in the mm_context.
<------><------> * Since we need to take a write lock to write to the context
<------><------> * to avoid races with storage keys handling, we check if the
<------><------> * value really needs to be written to; if the value is
<------><------> * already correct, we do nothing and avoid the lock.
<------><------> */
<------><------>if (vcpu->kvm->mm->context.uses_cmm == 0) {
<------><------><------>mmap_write_lock(vcpu->kvm->mm);
<------><------><------>vcpu->kvm->mm->context.uses_cmm = 1;
<------><------><------>mmap_write_unlock(vcpu->kvm->mm);
<------><------>}
<------><------>/*
<------><------> * If we are here, we are supposed to have CMMA enabled in
<------><------> * the SIE block. Enabling CMMA works on a per-CPU basis,
<------><------> * while the context use_cmma flag is per process.
<------><------> * It's possible that the context flag is enabled and the
<------><------> * SIE flag is not, so we set the flag always; if it was
<------><------> * already set, nothing changes, otherwise we enable it
<------><------> * on this CPU too.
<------><------> */
<------><------>vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
<------><------>/* Retry the ESSA instruction */
<------><------>kvm_s390_retry_instr(vcpu);
<------>} else {
<------><------>int srcu_idx;
 
<------><------>mmap_read_lock(vcpu->kvm->mm);
<------><------>srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
<------><------>i = __do_essa(vcpu, orc);
<------><------>srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
<------><------>mmap_read_unlock(vcpu->kvm->mm);
<------><------>if (i < 0)
<------><------><------>return i;
<------><------>/* Account for the possible extra cbrl entry */
<------><------>entries += i;
<------>}
<------>vcpu->arch.sie_block->cbrlo &= PAGE_MASK;	/* reset nceo */
<------>cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
<------>mmap_read_lock(gmap->mm);
<------>for (i = 0; i < entries; ++i)
<------><------>__gmap_zap(gmap, cbrlo[i]);
<------>mmap_read_unlock(gmap->mm);
<------>return 0;
}
 
int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
{
<------>switch (vcpu->arch.sie_block->ipa & 0x00ff) {
<------>case 0x8a:
<------>case 0x8e:
<------>case 0x8f:
<------><------>return handle_ipte_interlock(vcpu);
<------>case 0x8d:
<------><------>return handle_epsw(vcpu);
<------>case 0xab:
<------><------>return handle_essa(vcpu);
<------>case 0xaf:
<------><------>return handle_pfmf(vcpu);
<------>default:
<------><------>return -EOPNOTSUPP;
<------>}
}
 
int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
{
<------>int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
<------>int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
<------>int reg, rc, nr_regs;
<------>u32 ctl_array[16];
<------>u64 ga;
<------>u8 ar;
 
<------>vcpu->stat.instruction_lctl++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
 
<------>if (ga & 3)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
<------>trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
 
<------>nr_regs = ((reg3 - reg1) & 0xf) + 1;
<------>rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
<------>reg = reg1;
<------>nr_regs = 0;
<------>do {
<------><------>vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
<------><------>vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
<------><------>if (reg == reg3)
<------><------><------>break;
<------><------>reg = (reg + 1) % 16;
<------>} while (1);
<------>kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
<------>return 0;
}
 
int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
{
<------>int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
<------>int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
<------>int reg, rc, nr_regs;
<------>u32 ctl_array[16];
<------>u64 ga;
<------>u8 ar;
 
<------>vcpu->stat.instruction_stctl++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
 
<------>if (ga & 3)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
<------>trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
 
<------>reg = reg1;
<------>nr_regs = 0;
<------>do {
<------><------>ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
<------><------>if (reg == reg3)
<------><------><------>break;
<------><------>reg = (reg + 1) % 16;
<------>} while (1);
<------>rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
<------>return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
}
 
static int handle_lctlg(struct kvm_vcpu *vcpu)
{
<------>int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
<------>int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
<------>int reg, rc, nr_regs;
<------>u64 ctl_array[16];
<------>u64 ga;
<------>u8 ar;
 
<------>vcpu->stat.instruction_lctlg++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
 
<------>if (ga & 7)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
<------>trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
 
<------>nr_regs = ((reg3 - reg1) & 0xf) + 1;
<------>rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
<------>if (rc)
<------><------>return kvm_s390_inject_prog_cond(vcpu, rc);
<------>reg = reg1;
<------>nr_regs = 0;
<------>do {
<------><------>vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
<------><------>if (reg == reg3)
<------><------><------>break;
<------><------>reg = (reg + 1) % 16;
<------>} while (1);
<------>kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
<------>return 0;
}
 
static int handle_stctg(struct kvm_vcpu *vcpu)
{
<------>int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
<------>int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
<------>int reg, rc, nr_regs;
<------>u64 ctl_array[16];
<------>u64 ga;
<------>u8 ar;
 
<------>vcpu->stat.instruction_stctg++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
 
<------>if (ga & 7)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
<------>VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
<------>trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
 
<------>reg = reg1;
<------>nr_regs = 0;
<------>do {
<------><------>ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
<------><------>if (reg == reg3)
<------><------><------>break;
<------><------>reg = (reg + 1) % 16;
<------>} while (1);
<------>rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
<------>return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
}
 
int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
{
<------>switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
<------>case 0x25:
<------><------>return handle_stctg(vcpu);
<------>case 0x2f:
<------><------>return handle_lctlg(vcpu);
<------>case 0x60:
<------>case 0x61:
<------>case 0x62:
<------><------>return handle_ri(vcpu);
<------>default:
<------><------>return -EOPNOTSUPP;
<------>}
}
 
static int handle_tprot(struct kvm_vcpu *vcpu)
{
<------>u64 address1, address2;
<------>unsigned long hva, gpa;
<------>int ret = 0, cc = 0;
<------>bool writable;
<------>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, &ar, NULL);
 
<------>/* we only handle the Linux memory detection case:
<------> * access key == 0
<------> * everything else goes to userspace. */
<------>if (address2 & 0xf0)
<------><------>return -EOPNOTSUPP;
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
<------><------>ipte_lock(vcpu);
<------>ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
<------>if (ret == PGM_PROTECTION) {
<------><------>/* Write protected? Try again with read-only... */
<------><------>cc = 1;
<------><------>ret = guest_translate_address(vcpu, address1, ar, &gpa,
<------><------><------><------><------>      GACC_FETCH);
<------>}
<------>if (ret) {
<------><------>if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
<------><------><------>ret = kvm_s390_inject_program_int(vcpu, ret);
<------><------>} else if (ret > 0) {
<------><------><------>/* Translation not available */
<------><------><------>kvm_s390_set_psw_cc(vcpu, 3);
<------><------><------>ret = 0;
<------><------>}
<------><------>goto out_unlock;
<------>}
 
<------>hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
<------>if (kvm_is_error_hva(hva)) {
<------><------>ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
<------>} else {
<------><------>if (!writable)
<------><------><------>cc = 1;		/* Write not permitted ==> read-only */
<------><------>kvm_s390_set_psw_cc(vcpu, cc);
<------><------>/* Note: CC2 only occurs for storage keys (not supported yet) */
<------>}
out_unlock:
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
<------><------>ipte_unlock(vcpu);
<------>return ret;
}
 
int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
{
<------>switch (vcpu->arch.sie_block->ipa & 0x00ff) {
<------>case 0x01:
<------><------>return handle_tprot(vcpu);
<------>default:
<------><------>return -EOPNOTSUPP;
<------>}
}
 
static int handle_sckpf(struct kvm_vcpu *vcpu)
{
<------>u32 value;
 
<------>vcpu->stat.instruction_sckpf++;
 
<------>if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
<------><------>return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 
<------>if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
<------><------>return kvm_s390_inject_program_int(vcpu,
<------><------><------><------><------><------>   PGM_SPECIFICATION);
 
<------>value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
<------>vcpu->arch.sie_block->todpr = value;
 
<------>return 0;
}
 
static int handle_ptff(struct kvm_vcpu *vcpu)
{
<------>vcpu->stat.instruction_ptff++;
 
<------>/* we don't emulate any control instructions yet */
<------>kvm_s390_set_psw_cc(vcpu, 3);
<------>return 0;
}
 
int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
{
<------>switch (vcpu->arch.sie_block->ipa & 0x00ff) {
<------>case 0x04:
<------><------>return handle_ptff(vcpu);
<------>case 0x07:
<------><------>return handle_sckpf(vcpu);
<------>default:
<------><------>return -EOPNOTSUPP;
<------>}
}
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