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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>
This commit is contained in:
Marcelo Tosatti 2009-09-08 14:47:38 -03:00 committed by Avi Kivity
parent 80ced186d1
commit e8b3433a5c
1 changed files with 0 additions and 3 deletions
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arch/x86/kvm/svm.c
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@ -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;