On Wed, Mar 07, 2018 at 06:24:09PM +0000, Ard Biesheuvel wrote: > On 2 March 2018 at 16:54, Greg KH <greg@xxxxxxxxx> wrote: > > On Fri, Mar 02, 2018 at 05:14:50PM +0800, Alex Shi wrote: > >> > >> > >> On 03/01/2018 11:24 PM, Greg KH wrote: > >> > On Wed, Feb 28, 2018 at 11:56:22AM +0800, Alex Shi wrote: > >> >> Hi All, > >> >> > >> >> This backport patchset fixed the meltdown issue, it's original branch: > >> >> https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=kpti > >> >> A few dependency or fixingpatches are also picked up, if they are necessary > >> >> and no functional changes. > >> >> > >> >> The patchset also on repository: > >> >> git://git.linaro.org/kernel/linux-linaro-stable.git lts-4.9-spectrevv2 > >> >> > >> >> No bug found yet from kernelci.org and lkft testing. > >> > > >> > No bugs is good, but does it actually fix the meltdown problem? What > >> > did you test it on? > >> > >> Oh, I have no A73/A75 cpu, so I can not reproduce meltdown bug. > > > > Then why should I trust this backport at all? > > > > Please test on the hardware that is affected, otherwise you do not know > > if your patches do anything or not. > > > > I don't think it is feasible to test these backports by confirming > that they make the fundamental issue go away. We simply don't have the > code to reproduce all the variants, and we have to rely on the > information provided by ARM Ltd. regarding which cores are affected > and which aren't. You really don't have the reproducers? Please work with ARM to resolve that, this should not be a non-tested set of patches. That's really worse than no patches at all, as if they were applied, that would provide a false-sense of "all is fixed". thanks, greg k-h