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KVM: s390: gaccess: Cleanup access to guest pages
Introduce a helper function for guest frame access. Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com> Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Message-Id: <20211126164549.7046-4-scgl@linux.ibm.com> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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@ -866,6 +866,20 @@ static int guest_range_to_gpas(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
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return 0;
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}
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static int access_guest_page(struct kvm *kvm, enum gacc_mode mode, gpa_t gpa,
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void *data, unsigned int len)
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{
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const unsigned int offset = offset_in_page(gpa);
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const gfn_t gfn = gpa_to_gfn(gpa);
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int rc;
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if (mode == GACC_STORE)
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rc = kvm_write_guest_page(kvm, gfn, data, offset, len);
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else
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rc = kvm_read_guest_page(kvm, gfn, data, offset, len);
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return rc;
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}
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int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
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unsigned long len, enum gacc_mode mode)
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{
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@ -896,10 +910,7 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
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rc = guest_range_to_gpas(vcpu, ga, ar, gpas, len, asce, mode);
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for (idx = 0; idx < nr_pages && !rc; idx++) {
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fragment_len = min(PAGE_SIZE - offset_in_page(gpas[idx]), len);
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if (mode == GACC_STORE)
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rc = kvm_write_guest(vcpu->kvm, gpas[idx], data, fragment_len);
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else
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rc = kvm_read_guest(vcpu->kvm, gpas[idx], data, fragment_len);
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rc = access_guest_page(vcpu->kvm, mode, gpas[idx], data, fragment_len);
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len -= fragment_len;
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data += fragment_len;
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}
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@ -920,10 +931,7 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
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while (len && !rc) {
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gpa = kvm_s390_real_to_abs(vcpu, gra);
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fragment_len = min(PAGE_SIZE - offset_in_page(gpa), len);
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if (mode)
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rc = write_guest_abs(vcpu, gpa, data, fragment_len);
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else
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rc = read_guest_abs(vcpu, gpa, data, fragment_len);
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rc = access_guest_page(vcpu->kvm, mode, gpa, data, fragment_len);
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len -= fragment_len;
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gra += fragment_len;
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data += fragment_len;
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