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

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Hi Greg,

On 3/17/22 10:00 AM, Greg KH wrote:
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?

It means they'll be based on the versions I posted on before. But: the last review comment that
needs addressing is the A76 ID macros that came in with an errata workaround, but the workaround
wasn't backported. I need to work out how easy that is to do.


Thanks,

James



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