From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 22/42] KVM: SVM: remove needless mmap_sem acquision from nested_svm_map Date: Mon, 16 Nov 2009 14:19:23 +0200 Message-ID: <1258373983-8693-23-git-send-email-avi@redhat.com> References: <1258373983-8693-1-git-send-email-avi@redhat.com> Cc: kvm@vger.kernel.org To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1258373983-8693-1-git-send-email-avi@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org From: Marcelo Tosatti 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 Acked-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 3 --- 1 files changed, 0 insertions(+), 3 deletions(-) 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 @@ static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, enum km_type idx) { struct page *page; - down_read(¤t->mm->mmap_sem); page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT); - up_read(¤t->mm->mmap_sem); - if (is_error_page(page)) goto error; -- 1.6.5.2