4.19-stable review patch. If anyone has any objections, please let me know.
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From: Janis Schoetterl-Glausch scgl@linux.ibm.com
[ Upstream commit bad13799e0305deb258372b7298a86be4c78aaba ]
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 Stable-dep-of: e8061f06185b ("KVM: s390: gaccess: Check if guest address is in memslot") Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kvm/gaccess.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index d4fe5db5984dd..6ba82fe0776f8 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -866,6 +866,20 @@ static int guest_range_to_gpas(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, return 0; }
+static int access_guest_page(struct kvm *kvm, enum gacc_mode mode, gpa_t gpa, + void *data, unsigned int len) +{ + const unsigned int offset = offset_in_page(gpa); + const gfn_t gfn = gpa_to_gfn(gpa); + int rc; + + if (mode == GACC_STORE) + rc = kvm_write_guest_page(kvm, gfn, data, offset, len); + else + rc = kvm_read_guest_page(kvm, gfn, data, offset, len); + return rc; +} + int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data, unsigned long len, enum gacc_mode mode) { @@ -896,10 +910,7 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data, rc = guest_range_to_gpas(vcpu, ga, ar, gpas, len, asce, mode); for (idx = 0; idx < nr_pages && !rc; idx++) { fragment_len = min(PAGE_SIZE - offset_in_page(gpas[idx]), len); - if (mode == GACC_STORE) - rc = kvm_write_guest(vcpu->kvm, gpas[idx], data, fragment_len); - else - rc = kvm_read_guest(vcpu->kvm, gpas[idx], data, fragment_len); + rc = access_guest_page(vcpu->kvm, mode, gpas[idx], data, fragment_len); len -= fragment_len; data += fragment_len; } @@ -920,10 +931,7 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, while (len && !rc) { gpa = kvm_s390_real_to_abs(vcpu, gra); fragment_len = min(PAGE_SIZE - offset_in_page(gpa), len); - if (mode) - rc = write_guest_abs(vcpu, gpa, data, fragment_len); - else - rc = read_guest_abs(vcpu, gpa, data, fragment_len); + rc = access_guest_page(vcpu->kvm, mode, gpa, data, fragment_len); len -= fragment_len; gra += fragment_len; data += fragment_len;