Re: [RFC PATCH v5 5/5] vfio-pci: Allow to expose MSI-X table to userspace when safe

2017-08-09 Thread David Gibson
On Mon, Aug 07, 2017 at 05:25:48PM +1000, Alexey Kardashevskiy wrote: 1;4803;0c> Some devices have a MSIX BAR not aligned to the system page size > greater than 4K (like 64k for ppc64) which at the moment prevents > such MMIO pages from being mapped to the userspace for the sake of > the MSIX BAR c

[RFC PATCH v5 5/5] vfio-pci: Allow to expose MSI-X table to userspace when safe

2017-08-07 Thread Alexey Kardashevskiy
Some devices have a MSIX BAR not aligned to the system page size greater than 4K (like 64k for ppc64) which at the moment prevents such MMIO pages from being mapped to the userspace for the sake of the MSIX BAR content protection. If such page happens to share the same system page with some frequen