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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2008-09-16 20:54:46 -0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2008-10-15 14:25:05 +0200 |
| commit | 777b3f49d297e387866604093b635e5bc9b9d2a6 (patch) | |
| tree | d3df6d34bceb9905b033bb2e9e7e9bc6e0992542 /virt | |
| parent | bfadaded0dc323a1cf3f08b5068f12955b54cbaa (diff) | |
| download | lwn-777b3f49d297e387866604093b635e5bc9b9d2a6.tar.gz lwn-777b3f49d297e387866604093b635e5bc9b9d2a6.zip | |
KVM: opencode gfn_to_page in kvm_vm_fault
kvm_vm_fault is invoked with mmap_sem held in read mode. Since gfn_to_page
will be converted to get_user_pages_fast, which requires this lock NOT
to be held, switch to opencoded get_user_pages.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index f42d5c2a396d..2907d05cfcc3 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1394,17 +1394,22 @@ out: static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { + struct page *page[1]; + unsigned long addr; + int npages; + gfn_t gfn = vmf->pgoff; struct kvm *kvm = vma->vm_file->private_data; - struct page *page; - if (!kvm_is_visible_gfn(kvm, vmf->pgoff)) + addr = gfn_to_hva(kvm, gfn); + if (kvm_is_error_hva(addr)) return VM_FAULT_SIGBUS; - page = gfn_to_page(kvm, vmf->pgoff); - if (is_error_page(page)) { - kvm_release_page_clean(page); + + npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, + NULL); + if (unlikely(npages != 1)) return VM_FAULT_SIGBUS; - } - vmf->page = page; + + vmf->page = page[0]; return 0; } |