Commit e8b3433a authored Sep 08, 2009 by Marcelo Tosatti Committed by Avi Kivity Dec 03, 2009

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>

parent 80ced186

arch/x86/kvm/svm.c

+0 −3

Original line number	Diff line number	Diff line
		@@ -1396,10 +1396,7 @@ static void nested_svm_map(struct vcpu_svm svm, u64 gpa, enum km_type idx)
		{
		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;