Re: [PATCH for-4.9] livepatch: Declare live patching as a supported feature

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Mon, Jun 26, 2017 at 07:29:22PM +0100, Julien Grall wrote:
> Hi,
> 
> On 06/26/2017 04:36 PM, Ross Lagerwall wrote:
> > Xen Live Patching has been available as tech preview feature since Xen
> > 4.7 and has now had a couple of releases to stabilize. Xen Live patching
> > has been used by multiple vendors to fix several real-world security
> > issues without any severe bugs encountered. Additionally, there are now
> > tests in OSSTest that test live patching to ensure that no regressions
> > are introduced.
> > 
> > Based on the amount of testing and usage it has had, we are ready to
> > declare live patching as a 'Supported' feature.
> 
> There are only test for x86 and amd64. We likely want to have those test

The test-cases are also for ARM32.

> enabled for all architectures by default.

And the OSSTest can test all of those.
> 
> Also, I am not aware of anyone using in production livepatch on ARM64 and
> ARM32. So did anyone give a good kick at the ARM implementation?

I am not aware of anybody using it on production on ARM32 or ARM64.

The test-cases are there, the code is there, but yes nobody has kicked
the tires on ARM32/ARM64 extensively with it. I would be excited to
see vendors that use it and their reports but I am not aware of any.

> 
> If not, then we should  do it before even considering as a supported feature
> for ARM.

OK. Perhaps then only for x86 until ARM operational users pipe up?

> 
> Cheers,
> 
> -- 
> Julien Grall

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