On Tue, Oct 19, 2010 at 02:17:27PM +0200, Gleb Natapov wrote:
> On Tue, Oct 19, 2010 at 01:05:22PM +0200, Gleb Natapov wrote:
> > On Mon, Oct 18, 2010 at 08:24:03PM -0200, Marcelo Tosatti wrote:
> > >
> > > Only attempt async pagefault if address is contained within vma.
> > >
> > > Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
> > >
> > > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > > index 5d57ec9..a9cfbd2 100644
> > > --- a/virt/kvm/kvm_main.c
> > > +++ b/virt/kvm/kvm_main.c
> > > @@ -996,8 +996,9 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
> > >
> > > if (vma == NULL || addr < vma->vm_start ||
> > > !(vma->vm_flags & VM_PFNMAP)) {
> > > - if (async && !(vma->vm_flags & VM_PFNMAP) &&
> > > - (vma->vm_flags & VM_WRITE))
> > > + if (async && vma && !(vma->vm_flags & VM_PFNMAP) &&
> > actually we should check for addr < vma->vm_start here too. find_vma()
> > is very strange function.
> >
> > What about patch below (only compile tested for now)?
> >
> Works for me.
Thats much nicer.
> > - vma = find_vma(current->mm, addr);
> > + vma = find_vma_intersection(current->mm, addr, addr+1);
> >
> > - if (vma == NULL || addr < vma->vm_start ||
> > - !(vma->vm_flags & VM_PFNMAP)) {
> > - if (async && !(vma->vm_flags & VM_PFNMAP) &&
> > - (vma->vm_flags & VM_WRITE))
> > + if (vma == NULL)
> > + return get_fault_pfn();
up_read(mmap_sem)
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