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Commit 0615a326 authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
Browse files

KVM: s390: vsie: support shared IPTE-interlock facility 



As we forward the whole SCA provided by guest 2, we can directly forward
SIIF if available.

Acked-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 19c439b5

arch/s390/include/uapi/asm/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -100,6 +100,7 @@ struct kvm_s390_vm_cpu_machine { 
#define KVM_S390_VM_CPU_FEAT_ESOP	0

#define KVM_S390_VM_CPU_FEAT_SIEF2	1

#define KVM_S390_VM_CPU_FEAT_64BSCAO	2

#define KVM_S390_VM_CPU_FEAT_SIIF	3

struct kvm_s390_vm_cpu_feat {

	__u64 feat[16];

};

arch/s390/kvm/kvm-s390.c

+2 −0
Original line number Diff line number Diff line
@@ -267,6 +267,8 @@ static void kvm_s390_cpu_feat_init(void) 
	allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);

	if (sclp.has_64bscao)

		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);

	if (sclp.has_siif)

		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);

}



int kvm_arch_init(void *opaque)

arch/s390/kvm/vsie.c

+2 −0
Original line number Diff line number Diff line
@@ -315,6 +315,8 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
	/* Run-time-Instrumentation */

	if (test_kvm_facility(vcpu->kvm, 64))

		scb_s->ecb3 |= scb_o->ecb3 & 0x01U;

	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF))

		scb_s->eca |= scb_o->eca & 0x00000001U;



	prepare_ibc(vcpu, vsie_page);

	rc = shadow_crycb(vcpu, vsie_page);