414 строки
10 KiB
C
414 строки
10 KiB
C
/*
|
|
* 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 <asm/current.h>
|
|
#include <asm/debug.h>
|
|
#include <asm/ebcdic.h>
|
|
#include <asm/sysinfo.h>
|
|
#include "gaccess.h"
|
|
#include "kvm-s390.h"
|
|
|
|
static int handle_set_prefix(struct kvm_vcpu *vcpu)
|
|
{
|
|
int base2 = vcpu->arch.sie_block->ipb >> 28;
|
|
int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
|
|
u64 operand2;
|
|
u32 address = 0;
|
|
u8 tmp;
|
|
|
|
vcpu->stat.instruction_spx++;
|
|
|
|
operand2 = disp2;
|
|
if (base2)
|
|
operand2 += vcpu->run->s.regs.gprs[base2];
|
|
|
|
/* must be word boundary */
|
|
if (operand2 & 3) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
|
|
goto out;
|
|
}
|
|
|
|
/* get the value */
|
|
if (get_guest_u32(vcpu, operand2, &address)) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
goto out;
|
|
}
|
|
|
|
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))) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
goto out;
|
|
}
|
|
|
|
kvm_s390_set_prefix(vcpu, address);
|
|
|
|
VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static int handle_store_prefix(struct kvm_vcpu *vcpu)
|
|
{
|
|
int base2 = vcpu->arch.sie_block->ipb >> 28;
|
|
int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
|
|
u64 operand2;
|
|
u32 address;
|
|
|
|
vcpu->stat.instruction_stpx++;
|
|
operand2 = disp2;
|
|
if (base2)
|
|
operand2 += vcpu->run->s.regs.gprs[base2];
|
|
|
|
/* must be word boundary */
|
|
if (operand2 & 3) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
|
|
goto out;
|
|
}
|
|
|
|
address = vcpu->arch.sie_block->prefix;
|
|
address = address & 0x7fffe000u;
|
|
|
|
/* get the value */
|
|
if (put_guest_u32(vcpu, operand2, address)) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
goto out;
|
|
}
|
|
|
|
VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
|
|
{
|
|
int base2 = vcpu->arch.sie_block->ipb >> 28;
|
|
int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
|
|
u64 useraddr;
|
|
int rc;
|
|
|
|
vcpu->stat.instruction_stap++;
|
|
useraddr = disp2;
|
|
if (base2)
|
|
useraddr += vcpu->run->s.regs.gprs[base2];
|
|
|
|
if (useraddr & 1) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
|
|
goto out;
|
|
}
|
|
|
|
rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
|
|
if (rc == -EFAULT) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
goto out;
|
|
}
|
|
|
|
VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
|
|
out:
|
|
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_stsch(struct kvm_vcpu *vcpu)
|
|
{
|
|
vcpu->stat.instruction_stsch++;
|
|
VCPU_EVENT(vcpu, 4, "%s", "store subchannel - CC3");
|
|
/* condition code 3 */
|
|
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
|
|
vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
|
|
return 0;
|
|
}
|
|
|
|
static int handle_chsc(struct kvm_vcpu *vcpu)
|
|
{
|
|
vcpu->stat.instruction_chsc++;
|
|
VCPU_EVENT(vcpu, 4, "%s", "channel subsystem call - CC3");
|
|
/* condition code 3 */
|
|
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 == -EFAULT)
|
|
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
else
|
|
VCPU_EVENT(vcpu, 5, "store facility list value %x",
|
|
facility_list);
|
|
return 0;
|
|
}
|
|
|
|
static int handle_stidp(struct kvm_vcpu *vcpu)
|
|
{
|
|
int base2 = vcpu->arch.sie_block->ipb >> 28;
|
|
int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
|
|
u64 operand2;
|
|
int rc;
|
|
|
|
vcpu->stat.instruction_stidp++;
|
|
operand2 = disp2;
|
|
if (base2)
|
|
operand2 += vcpu->run->s.regs.gprs[base2];
|
|
|
|
if (operand2 & 7) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
|
|
goto out;
|
|
}
|
|
|
|
rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
|
|
if (rc == -EFAULT) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
goto out;
|
|
}
|
|
|
|
VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
|
|
out:
|
|
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;
|
|
int base2 = vcpu->arch.sie_block->ipb >> 28;
|
|
int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
|
|
u64 operand2;
|
|
unsigned long mem;
|
|
|
|
vcpu->stat.instruction_stsi++;
|
|
VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
|
|
|
|
operand2 = disp2;
|
|
if (base2)
|
|
operand2 += vcpu->run->s.regs.gprs[base2];
|
|
|
|
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_fail;
|
|
if (stsi((void *) mem, fc, sel1, sel2))
|
|
goto out_mem;
|
|
break;
|
|
case 3:
|
|
if (sel1 != 2 || sel2 != 2)
|
|
goto out_fail;
|
|
mem = get_zeroed_page(GFP_KERNEL);
|
|
if (!mem)
|
|
goto out_fail;
|
|
handle_stsi_3_2_2(vcpu, (void *) mem);
|
|
break;
|
|
default:
|
|
goto out_fail;
|
|
}
|
|
|
|
if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
|
|
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
goto out_mem;
|
|
}
|
|
free_page(mem);
|
|
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
|
|
vcpu->run->s.regs.gprs[0] = 0;
|
|
return 0;
|
|
out_mem:
|
|
free_page(mem);
|
|
out_fail:
|
|
/* condition code 3 */
|
|
vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
|
|
return 0;
|
|
}
|
|
|
|
static intercept_handler_t priv_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,
|
|
[0x34] = handle_stsch,
|
|
[0x5f] = handle_chsc,
|
|
[0x7d] = handle_stsi,
|
|
[0xb1] = handle_stfl,
|
|
};
|
|
|
|
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 = priv_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_tprot(struct kvm_vcpu *vcpu)
|
|
{
|
|
int base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
|
|
int disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
|
|
int base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
|
|
int disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
|
|
u64 address1 = disp1 + base1 ? vcpu->run->s.regs.gprs[base1] : 0;
|
|
u64 address2 = disp2 + base2 ? vcpu->run->s.regs.gprs[base2] : 0;
|
|
struct vm_area_struct *vma;
|
|
unsigned long user_address;
|
|
|
|
vcpu->stat.instruction_tprot++;
|
|
|
|
/* 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;
|
|
|
|
|
|
/* we must resolve the address without holding the mmap semaphore.
|
|
* This is ok since the userspace hypervisor is not supposed to change
|
|
* the mapping while the guest queries the memory. Otherwise the guest
|
|
* might crash or get wrong info anyway. */
|
|
user_address = (unsigned long) __guestaddr_to_user(vcpu, address1);
|
|
|
|
down_read(¤t->mm->mmap_sem);
|
|
vma = find_vma(current->mm, user_address);
|
|
if (!vma) {
|
|
up_read(¤t->mm->mmap_sem);
|
|
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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 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;
|
|
}
|