From 072c9878eedc2f1ef2f0d19ac7680beeee97bf05 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Wed, 1 Jan 2014 16:21:47 +0100 Subject: [PATCH] KVM: s390: add kvm_s390_logical_to_effective() helper Add kvm_s390_logical_to_effective() helper which converts a guest vcpu's logical storage address to a guest vcpu effective address by applying the rules of the vcpu's addressing mode defined by PSW bits 31 and 32 (extendended and basic addressing mode). Depending on the vcpu's addressing mode the upper 40 bits (24 bit addressing mode), 33 bits (31 bit addressing mode) or no bits (64 bit addressing mode) will be zeroed and the remaining bits will be returned. Signed-off-by: Heiko Carstens Signed-off-by: Christian Borntraeger --- arch/s390/kvm/gaccess.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h index 374a439ccc60..ae3cb638f220 100644 --- a/arch/s390/kvm/gaccess.h +++ b/arch/s390/kvm/gaccess.h @@ -30,6 +30,31 @@ static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu, return gaddr; } +/** + * kvm_s390_logical_to_effective - convert guest logical to effective address + * @vcpu: guest virtual cpu + * @ga: guest logical address + * + * Convert a guest vcpu logical address to a guest vcpu effective address by + * applying the rules of the vcpu's addressing mode defined by PSW bits 31 + * and 32 (extendended/basic addressing mode). + * + * Depending on the vcpu's addressing mode the upper 40 bits (24 bit addressing + * mode), 33 bits (31 bit addressing mode) or no bits (64 bit addressing mode) + * of @ga will be zeroed and the remaining bits will be returned. + */ +static inline unsigned long kvm_s390_logical_to_effective(struct kvm_vcpu *vcpu, + unsigned long ga) +{ + psw_t *psw = &vcpu->arch.sie_block->gpsw; + + if (psw_bits(*psw).eaba == PSW_AMODE_64BIT) + return ga; + if (psw_bits(*psw).eaba == PSW_AMODE_31BIT) + return ga & ((1UL << 31) - 1); + return ga & ((1UL << 24) - 1); +} + static inline void __user *__gptr_to_uptr(struct kvm_vcpu *vcpu, void __user *gptr, int prefixing)