On Tue, Jul 17, 2018 at 05:19:11PM +1000, Alexey Kardashevskiy wrote: > This is to improve page boundaries checking and should probably > be cc:stable. I came accross this while debugging nvlink2 passthrough > but the lack of checking might be exploited by the existing userspace. > > The get_user_pages() comment says it should be "phased out" but the only > alternative seems to be get_user_pages_longterm(), should that be used > instead (this is longterm reference elevation, however it is not DAX, > whatever this implies)? get_user_pages_remote() seems unnecessarily > complicated because of @locked. > > > Changes: > v7: > * 2/2: do not fail if pte is not found, fall back to the default case instead > > v6: > * 2/2: read pageshift from pte > > v5: > * 2/2: changed compound pages handling > > v4: > * 2/2: implemented less strict but still safe max pageshift as David suggested > > v3: > * enforced huge pages not to cross preregistered chunk boundaries > > v2: > * 2/2: explicitly check for compound pages before calling compound_order() > > > This is based on sha1 > 9d3cce1 Linus Torvalds "Linux 4.18-rc5". > > Please comment. Thanks. > > > > Alexey Kardashevskiy (2): > vfio/spapr: Use IOMMU pageshift rather than pagesize > KVM: PPC: Check if IOMMU page is contained in the pinned physical page > > arch/powerpc/include/asm/mmu_context.h | 4 ++-- > arch/powerpc/kvm/book3s_64_vio.c | 2 +- > arch/powerpc/kvm/book3s_64_vio_hv.c | 6 ++++-- > arch/powerpc/mm/mmu_context_iommu.c | 37 ++++++++++++++++++++++++++++++++-- > drivers/vfio/vfio_iommu_spapr_tce.c | 10 ++++----- > 5 files changed, 47 insertions(+), 12 deletions(-) Thanks, series applied to my kvm-ppc-next branch. Paul. -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
