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authorMarcelo Tosatti <mtosatti@redhat.com>2008-09-16 20:54:46 -0300
committerAvi Kivity <avi@redhat.com>2008-10-15 14:25:05 +0200
commit777b3f49d297e387866604093b635e5bc9b9d2a6 (patch)
treed3df6d34bceb9905b033bb2e9e7e9bc6e0992542 /virt
parentbfadaded0dc323a1cf3f08b5068f12955b54cbaa (diff)
downloadlinux-777b3f49d297e387866604093b635e5bc9b9d2a6.tar.gz
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.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f42d5c2a396..2907d05cfcc 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;
}