[COMMIT master] KVM: SVM: remove needless mmap_sem acquision from nested_svm_map

Sat, 12 Sep 2009 01:46:56 -0700 

From: Marcelo Tosatti <[email protected]>

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 <[email protected]>
Acked-by: Alexander Graf <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a5f90c7..a2f2d43 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1394,10 +1394,7 @@ 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;
 
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