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linux/arch/s390/kvm/priv.c
Heiko Carstens a53c8fab3f s390/comments: unify copyright messages and remove file names 
Remove the file name from the comment at top of many files. In most
cases the file name was wrong anyway, so it's rather pointless.

Also unify the IBM copyright statement. We did have a lot of sightly
different statements and wanted to change them one after another
whenever a file gets touched. However that never happened. Instead
people start to take the old/"wrong" statements to use as a template
for new files.
So unify all of them in one go.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2012-07-20 11:15:04 +02:00

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/*
* 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) == -ENOSYS)
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) == -ENOSYS)
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(&current->mm->mmap_sem);
vma = find_vma(current->mm, user_address);
if (!vma) {
up_read(&current->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(&current->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;
}
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