[GIT PULL 09/12] KVM: s390: Allow 4k granularity for memslots

[Janosch Frank <frankja@linux.ibm.com>]

From: Claudio Imbrenda <imbrenda@linux.ibm.com>

Until now memslots on s390 needed to have 1M granularity and be 1M
aligned. Since the new gmap code can handle memslots with 4k
granularity and alignment, remove the restrictions.

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index a583c0a00efd..156878c95e06 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5642,8 +5642,6 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 				   struct kvm_memory_slot *new,
 				   enum kvm_mr_change change)
 {
-	gpa_t size;
-
 	if (kvm_is_ucontrol(kvm) && new->id < KVM_USER_MEM_SLOTS)
 		return -EINVAL;
 
@@ -5653,20 +5651,14 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 
 	if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) {
 		/*
-		 * A few sanity checks. We can have memory slots which have to be
-		 * located/ended at a segment boundary (1MB). The memory in userland is
-		 * ok to be fragmented into various different vmas. It is okay to mmap()
-		 * and munmap() stuff in this slot after doing this call at any time
+		 * A few sanity checks. The memory in userland is ok to be
+		 * fragmented into various different vmas. It is okay to mmap()
+		 * and munmap() stuff in this slot after doing this call at any
+		 * time.
 		 */
-
-		if (new->userspace_addr & 0xffffful)
+		if (new->userspace_addr & ~PAGE_MASK)
 			return -EINVAL;
-
-		size = new->npages * PAGE_SIZE;
-		if (size & 0xffffful)
-			return -EINVAL;
-
-		if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit)
+		if ((new->base_gfn + new->npages) * PAGE_SIZE > kvm->arch.mem_limit)
 			return -EINVAL;
 	}
 
-- 
2.53.0