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Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c22
1 files changed, 5 insertions, 17 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4026d7d64296..678e80561b74 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -227,7 +227,7 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
*
* Discontiguous memory is allowed, mostly for framebuffers.
*
- * Must be called holding kvm->lock.
+ * Must be called holding mmap_sem for write.
*/
int __kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
@@ -338,9 +338,9 @@ int kvm_set_memory_region(struct kvm *kvm,
{
int r;
- mutex_lock(&kvm->lock);
+ down_write(&current->mm->mmap_sem);
r = __kvm_set_memory_region(kvm, mem, user_alloc);
- mutex_unlock(&kvm->lock);
+ up_write(&current->mm->mmap_sem);
return r;
}
EXPORT_SYMBOL_GPL(kvm_set_memory_region);
@@ -456,7 +456,7 @@ static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
/*
* Requires current->mm->mmap_sem to be held
*/
-static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn)
+struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
struct page *page[1];
unsigned long addr;
@@ -481,17 +481,6 @@ static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn)
return page[0];
}
-struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
-{
- struct page *page;
-
- down_read(&current->mm->mmap_sem);
- page = __gfn_to_page(kvm, gfn);
- up_read(&current->mm->mmap_sem);
-
- return page;
-}
-
EXPORT_SYMBOL_GPL(gfn_to_page);
void kvm_release_page_clean(struct page *page)
@@ -977,8 +966,7 @@ static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
if (!kvm_is_visible_gfn(kvm, vmf->pgoff))
return VM_FAULT_SIGBUS;
- /* current->mm->mmap_sem is already held so call lockless version */
- page = __gfn_to_page(kvm, vmf->pgoff);
+ page = gfn_to_page(kvm, vmf->pgoff);
if (is_error_page(page)) {
kvm_release_page_clean(page);
return VM_FAULT_SIGBUS;