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KVM: s390: Helper for converting real addresses to absolute

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Added a separate helper function that translates guest real addresses
to guest absolute addresses by applying the prefix of the guest CPU.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Thomas Huth 2013-09-12 10:33:47 +02:00 committed by Paolo Bonzini
parent ff7158b227
commit 732e563373
1 changed files with 14 additions and 7 deletions
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21
arch/s390/kvm/gaccess.h
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@ -18,20 +18,27 @@
#include <asm/uaccess.h>
#include "kvm-s390.h"
/* Convert real to absolute address by applying the prefix of the CPU */
static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu,
unsigned long gaddr)
{
unsigned long prefix = vcpu->arch.sie_block->prefix;
if (gaddr < 2 * PAGE_SIZE)
gaddr += prefix;
else if (gaddr >= prefix && gaddr < prefix + 2 * PAGE_SIZE)
gaddr -= prefix;
return gaddr;
}
static inline void __user *__gptr_to_uptr(struct kvm_vcpu *vcpu,
void __user *gptr,
int prefixing)
{
unsigned long prefix = vcpu->arch.sie_block->prefix;
unsigned long gaddr = (unsigned long) gptr;
unsigned long uaddr;
if (prefixing) {
if (gaddr < 2 * PAGE_SIZE)
gaddr += prefix;
else if ((gaddr >= prefix) && (gaddr < prefix + 2 * PAGE_SIZE))
gaddr -= prefix;
}
if (prefixing)
gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
uaddr = gmap_fault(gaddr, vcpu->arch.gmap);
if (IS_ERR_VALUE(uaddr))
uaddr = -EFAULT;