Re: [PATCH v2 3/3] vfio-pci: Invalidate mmaps and block MMIO access on disabled memory

On Thu, 21 May 2020 22:39:06 -0400 Qian Cai wrote: > On Tue, May 05, 2020 at 03:55:02PM -0600, Alex Williamson wrote: > [] > vfio_pci_mmap_fault(struct vm_fault *vmf) > > { > > struct vm_area_struct *vma = vmf->vma; > > struct vfio_pci_device *vdev = vma->vm_private_data; > > +

Re: [PATCH v2 3/3] vfio-pci: Invalidate mmaps and block MMIO access on disabled memory

On Tue, May 05, 2020 at 03:55:02PM -0600, Alex Williamson wrote: [] vfio_pci_mmap_fault(struct vm_fault *vmf) > { > struct vm_area_struct *vma = vmf->vma; > struct vfio_pci_device *vdev = vma->vm_private_data; > + vm_fault_t ret = VM_FAULT_NOPAGE; > > - if

[PATCH v2 3/3] vfio-pci: Invalidate mmaps and block MMIO access on disabled memory

Accessing the disabled memory space of a PCI device would typically result in a master abort response on conventional PCI, or an unsupported request on PCI express. The user would generally see these as a -1 response for the read return data and the write would be silently discarded, possibly