commit e8b3433a5c062e94e34cadb6144c10689a497bc3
author Marcelo Tosatti <mtosatti@redhat.com> Tue Sep 08 14:47:38 2009 -0300
committer Avi Kivity <avi@redhat.com> Thu Dec 03 09:32:10 2009 +0200
tree 51af19ba8f6a25e02dc8a1530a0d7bbd2f5a7a3b
parent 80ced186d1761d2a66163d9eeb468ddb1f7e0697

KVM: SVM: remove needless mmap_sem acquision from nested_svm_map

nested_svm_map unnecessarily takes mmap_sem around gfn_to_page, since
gfn_to_page / get_user_pages are responsible for it.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/svm.c

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 92048a6..f54c4f9 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1396,10 +1396,7 @@
 {
 	struct page *page;
 
-	down_read(&current->mm->mmap_sem);
 	page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT);
-	up_read(&current->mm->mmap_sem);
-
 	if (is_error_page(page))
 		goto error;