On Sat, Feb 21, 2026 at 10:33:47AM +0000, Marc Zyngier wrote:

On Fri, 20 Feb 2026 19:08:59 +0000,
Mark Brown [off-list ref] wrote:

quoted

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).

quoted

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.