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KVM: s390: vsie: support 64-bit-SCAO 

Let's provide the 64-bit-SCAO facility to guest 2, so he can set up a SCA
for guest 3 that has a 64 bit address. Please note that we already require
the 64 bit SCAO for our vsie implementation, in order to forward the SCA
directly (by pinning the page).

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2015-11-25 11:02:26 +01:00 committed by Christian Borntraeger
parent 588438cba0
commit 19c439b564
3 changed files with 7 additions and 0 deletions
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1
arch/s390/include/uapi/asm/kvm.h
View File

@ -99,6 +99,7 @@ struct kvm_s390_vm_cpu_machine {
#define KVM_S390_VM_CPU_FEAT_NR_BITS 1024
#define KVM_S390_VM_CPU_FEAT_ESOP 0
#define KVM_S390_VM_CPU_FEAT_SIEF2 1
#define KVM_S390_VM_CPU_FEAT_64BSCAO 2
struct kvm_s390_vm_cpu_feat {
__u64 feat[16];
};

2
arch/s390/kvm/kvm-s390.c
View File

@ -265,6 +265,8 @@ static void kvm_s390_cpu_feat_init(void)
!test_facility(3))
return;
allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
if (sclp.has_64bscao)
allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
}
int kvm_arch_init(void *opaque)

4
arch/s390/kvm/vsie.c
View File

@ -449,6 +449,8 @@ static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol;
if (hpa) {
gpa = scb_o->scaol & ~0xfUL;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
gpa |= (u64) scb_o->scaoh << 32;
unpin_guest_page(vcpu->kvm, gpa, hpa);
scb_s->scaol = 0;
scb_s->scaoh = 0;
@ -499,6 +501,8 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
int rc = 0;
gpa = scb_o->scaol & ~0xfUL;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
gpa |= (u64) scb_o->scaoh << 32;
if (gpa) {
if (!(gpa & ~0x1fffUL))
rc = set_validity_icpt(scb_s, 0x0038U);