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KVM: s390: split kvm_s390_real_to_abs 

A new function _kvm_s390_real_to_abs will apply prefixing to a real address
with a given prefix value.

The old kvm_s390_real_to_abs becomes now a wrapper around the new function.

This is needed to avoid code duplication in vSIE.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210322140559.500716-2-imbrenda@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Claudio Imbrenda 2021-03-22 15:05:58 +01:00 committed by Christian Borntraeger
parent bdf7509bbe
commit c5d1f6b531
1 changed files with 18 additions and 7 deletions
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25
arch/s390/kvm/gaccess.h
View File

@ -16,6 +16,23 @@
#include <linux/ptrace.h>
#include "kvm-s390.h"
/**
* kvm_s390_real_to_abs - convert guest real address to guest absolute address
* @prefix - guest prefix
* @gra - guest real address
*
* Returns the guest absolute address that corresponds to the passed guest real
* address @gra of by applying the given prefix.
*/
static inline unsigned long _kvm_s390_real_to_abs(u32 prefix, unsigned long gra)
{
if (gra < 2 * PAGE_SIZE)
gra += prefix;
else if (gra >= prefix && gra < prefix + 2 * PAGE_SIZE)
gra -= prefix;
return gra;
}
/**
* kvm_s390_real_to_abs - convert guest real address to guest absolute address
* @vcpu - guest virtual cpu
@ -27,13 +44,7 @@
static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu,
unsigned long gra)
{
unsigned long prefix = kvm_s390_get_prefix(vcpu);
if (gra < 2 * PAGE_SIZE)
gra += prefix;
else if (gra >= prefix && gra < prefix + 2 * PAGE_SIZE)
gra -= prefix;
return gra;
return _kvm_s390_real_to_abs(kvm_s390_get_prefix(vcpu), gra);
}
/**