pKVM breakage in mainline on n1sdp

[Mark Brown]

On Sat, Feb 21, 2026 at 10:33:47AM +0000, Marc Zyngier wrote:
> On Fri, 20 Feb 2026 19:08:59 +0000,
> Mark Brown <broonie at kernel.org> wrote:

> > At some point since the 30th of January we have started seeing issues 
> > in mainline when running kvm-unit-tests on N1SDP in pKVM mode:

> The absence of any versioning information is really unhelpful. What
> kernel version is that? Upstream? Next? A date really doesn't help
> much, specially given how vague it is. Same thing for KUT.

As mentioned above this is with mainline, that is to say with Linus'
tree.

kvm-unit-tests should be at commit 0ed2cdf3c8 ("arm64: Fix sve_vl() for
build errors"), though it doesn't announce a version at runtime (and we
should really update from there, especially once the next release
happens which will hopefully be soon).

> > The same tests running on N1SDP in VHE mode seem happy, and I've not
> > seen any other platforms showing issues.  Unfortunately due to various
> > infrastructure issues I don't have more detail on when this started
> > happening or anything, I'll update if I get more.

> I've ran that test on an Altra (Neoverse-N1, same as N1SDP), with both
> v6.19 and linux/master as of d79526b89571 together with KUT as of
> 86e53277 and nothing caught fire in protected mode, including a
> 32-parallel VM test.

Indeed, one of the other machines that wasn't showing these issues for
me was an Altra.

> Most of KUT's PMU tests fail in protected mode though, probably due
> some issue with the routing of PMU exceptions (see below), but that
> doesn't seem new. Fuad, could you please have a look and see if
> something catches your eye?

Yes, there are a bunch of other long standing failures in protected
mode, like can be seen with this run on i.MX8MP for Linus' tip of tree:

   https://lava.sirena.org.uk/scheduler/job/2478171#L1365

which is a lot less happy than the non-pKVM run for the same commit on
the same board:

   https://lava.sirena.org.uk/scheduler/job/2478178#L1360

(those runs will have a more recent kvm-unit-tests version, it's
separate infrastructure).  I don't recall those tests ever working with
pKVM.
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