From d77e64141e322a3202de71a4afa7956c98d2a302 Mon Sep 17 00:00:00 2001 From: Michael Mueller Date: Mon, 12 Jun 2017 12:37:57 +0200 Subject: KVM: s390: implement GISA IPM related primitives The patch implements routines to access the GISA to test and modify its Interruption Pending Mask (IPM) from the host side. Signed-off-by: Michael Mueller Reviewed-by: Pierre Morel Reviewed-by: Halil Pasic Reviewed-by: Christian Borntraeger Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- arch/s390/kvm/interrupt.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'arch/s390/kvm') diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index b731d4f..8985ce5 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -203,6 +203,34 @@ static inline u8 int_word_to_isc(u32 int_word) return (int_word & 0x38000000) >> 27; } +/* + * To use atomic bitmap functions, we have to provide a bitmap address + * that is u64 aligned. However, the ipm might be u32 aligned. + * Therefore, we logically start the bitmap at the very beginning of the + * struct and fixup the bit number. + */ +#define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE) + +static inline void kvm_s390_gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc) +{ + set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa); +} + +static inline u8 kvm_s390_gisa_get_ipm(struct kvm_s390_gisa *gisa) +{ + return READ_ONCE(gisa->ipm); +} + +static inline void kvm_s390_gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc) +{ + clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa); +} + +static inline int kvm_s390_gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc) +{ + return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa); +} + static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu) { return vcpu->kvm->arch.float_int.pending_irqs | -- cgit v1.1