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| author |   Thomas Huth <thuth@linux.vnet.ibm.com> | 2013-09-12 10:33:47 +0200 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2013-09-24 19:12:20 +0200 |
| commit | 732e563373ffc57d38a8a3b6d55f2de865182117 (patch) | |
| tree | aa525f70905914833c4d47e737de96b82cbb1037 /arch/s390/kvm/gaccess.h | |
| parent | KVM: s390: Allow NULL parameter for kvm_s390_get_regs_rre (diff) | |
| download | linux-dev-732e563373ffc57d38a8a3b6d55f2de865182117.tar.xz linux-dev-732e563373ffc57d38a8a3b6d55f2de865182117.zip | |
KVM: s390: Helper for converting real addresses to absolute
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>
Diffstat (limited to 'arch/s390/kvm/gaccess.h')
| -rw-r--r-- | arch/s390/kvm/gaccess.h | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h index 99d789e8a018..374a439ccc60 100644 --- a/arch/s390/kvm/gaccess.h +++ b/arch/s390/kvm/gaccess.h @@ -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; |