[S390] Use gmap translation for accessing guest memory
This patch removes kvm-s390 internal assumption of a linear mapping
of guest address space to user space. Previously, guest memory was
translated to user addresses using a fixed offset (gmsor). The new
code uses gmap_fault to resolve guest addresses.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 654fc1f..c7c5189 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -165,29 +165,33 @@
int rc;
vcpu->stat.exit_validity++;
- if ((viwhy == 0x37) && (vcpu->arch.sie_block->prefix
- <= kvm_s390_vcpu_get_memsize(vcpu) - 2*PAGE_SIZE)) {
- rc = fault_in_pages_writeable((char __user *)
- vcpu->arch.sie_block->gmsor +
- vcpu->arch.sie_block->prefix,
- 2*PAGE_SIZE);
- if (rc) {
- /* user will receive sigsegv, exit to user */
- rc = -EOPNOTSUPP;
- goto out;
- }
+ if (viwhy == 0x37) {
vmaddr = gmap_fault(vcpu->arch.sie_block->prefix,
vcpu->arch.gmap);
if (IS_ERR_VALUE(vmaddr)) {
rc = -EOPNOTSUPP;
goto out;
}
+ rc = fault_in_pages_writeable((char __user *) vmaddr,
+ PAGE_SIZE);
+ if (rc) {
+ /* user will receive sigsegv, exit to user */
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE,
vcpu->arch.gmap);
if (IS_ERR_VALUE(vmaddr)) {
rc = -EOPNOTSUPP;
goto out;
}
+ rc = fault_in_pages_writeable((char __user *) vmaddr,
+ PAGE_SIZE);
+ if (rc) {
+ /* user will receive sigsegv, exit to user */
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
} else
rc = -EOPNOTSUPP;