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authorPaolo Bonzini <pbonzini@redhat.com>2015-05-18 14:59:39 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2015-05-26 13:40:13 +0300
commit09170a49422bd786be3eac5cec1955257c5a34b7 (patch)
treeab427ac2ef8739a7faf1d34eab7a94f18df37dd5 /virt/kvm
parent9f6b8029787bb37170d4535e9fc09158f634282c (diff)
downloadlinux-09170a49422bd786be3eac5cec1955257c5a34b7.tar.xz
KVM: const-ify uses of struct kvm_userspace_memory_region
Architecture-specific helpers are not supposed to muck with struct kvm_userspace_memory_region contents. Add const to enforce this. In order to eliminate the only write in __kvm_set_memory_region, the cleaning of deleted slots is pulled up from update_memslots to __kvm_set_memory_region. Reviewed-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Reviewed-by: Radim Krcmar <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/kvm_main.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 42df724071c0..fc2dbe1c34fc 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -676,8 +676,6 @@ static void update_memslots(struct kvm_memslots *slots,
WARN_ON(mslots[i].id != id);
if (!new->npages) {
WARN_ON(!mslots[i].npages);
- new->base_gfn = 0;
- new->flags = 0;
if (mslots[i].npages)
slots->used_slots--;
} else {
@@ -717,7 +715,7 @@ static void update_memslots(struct kvm_memslots *slots,
slots->id_to_index[mslots[i].id] = i;
}
-static int check_memory_region_flags(struct kvm_userspace_memory_region *mem)
+static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
{
u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
@@ -767,7 +765,7 @@ static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
* Must be called holding kvm->slots_lock for write.
*/
int __kvm_set_memory_region(struct kvm *kvm,
- struct kvm_userspace_memory_region *mem)
+ const struct kvm_userspace_memory_region *mem)
{
int r;
gfn_t base_gfn;
@@ -806,9 +804,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (npages > KVM_MEM_MAX_NR_PAGES)
goto out;
- if (!npages)
- mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
-
new = old = *slot;
new.id = mem->slot;
@@ -834,10 +829,14 @@ int __kvm_set_memory_region(struct kvm *kvm,
goto out;
}
}
- } else if (old.npages) {
+ } else {
+ if (!old.npages)
+ goto out;
+
change = KVM_MR_DELETE;
- } else /* Modify a non-existent slot: disallowed. */
- goto out;
+ new.base_gfn = 0;
+ new.flags = 0;
+ }
if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
/* Check for overlaps */
@@ -944,7 +943,7 @@ out:
EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
int kvm_set_memory_region(struct kvm *kvm,
- struct kvm_userspace_memory_region *mem)
+ const struct kvm_userspace_memory_region *mem)
{
int r;
@@ -960,6 +959,7 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
{
if (mem->slot >= KVM_USER_MEM_SLOTS)
return -EINVAL;
+
return kvm_set_memory_region(kvm, mem);
}