[stable:PATCH v5.4.184 00/22] arm64: Mitigate spectre style branch history side channels

[Greg KH]

On Wed, Mar 16, 2022 at 11:41:07AM -0400, Sasha Levin wrote:
> On Tue, Mar 15, 2022 at 06:23:53PM +0000, James Morse wrote:
> > Hi Greg,
> > 
> > Here is the state of the current v5.4 backport. Now that the 32bit
> > code has been merged, it doesn't conflict when KVM's shared 32bit/64bit
> > code needs to use these constants.
> > 
> > I've fixed the two issues that were reported against the v5.10 backport.
> > 
> > I had a go at bringing all the pre-requisites in to add proton-pack.c
> > to v5.4. Its currently 39 patches:
> > https://git.gitlab.arm.com/linux-arm/linux-jm.git /bhb/alternative_backport/UNTESTED/v5.4.183
> > (or for web browsers:
> > https://gitlab.arm.com/linux-arm/linux-jm/-/commits/bhb/alternative_backport/UNTESTED/v5.4.183/
> > )
> 
> I've queued it up.

Thanks for merging these, and James, thanks for the backports!  I agree,
this way is a bit "simpler", but thanks for trying the other way as
well.

Does this mean that the 4.19 and older backports will be easier?

greg k-h