Re: [kvm-unit-tests PATCH v3 00/10] arm64: EL2 support

[Eric Auger <eric.auger@redhat.com>]

Hi Joey,

On 11/27/25 12:08 PM, Joey Gouly wrote:
> On Thu, Nov 27, 2025 at 11:04:43AM +0100, Eric Auger wrote:
>> Hi Joey,
>>
>> On 9/25/25 4:19 PM, Joey Gouly wrote:
>>> Hi all,
>>>
>>> This series is for adding support to running the kvm-unit-tests at EL2. These
>>> have been tested with Linux 6.17-rc6 KVM nested virt.
>>>
>>> This latest round I also tested using the run_tests.sh script with QEMU TCG,
>>> running at EL2.
>>>
>>> The goal is to later extend and add new tests for Nested Virtualisation,
>>> however they should also work with bare metal as well.
>>>
>>> Changes since v2[1]:
>>> 	- Move the sctlr setup in EFI to a function.
>>> 	- Decided to not re-use el2_setup.h from Linux, looked more
>>> 	  complicated to use than needed for KUT.
>>> 	- Add EL2 env variable for testing, open to feedback for that.
>>> 	  This was untested with kvmtool as my testing setup only has
>>> 	  busybox ash currently, and the run_tests.sh script needs bash.
>>>
>>> Issues (that I think are fine to investigate/fix later):
>>> 	- Some of the debug tests fail with QEMU at EL2 and kvmtool.
>>> 	- The gic ipi test times out with QEMU at EL2, but works with kvmtool.
>> Have you noticed any failure with migration tests. On my end, as soon as
>> I set EL2=1 migration tests do fail.
> Yes migration also fails here, forgot to mention that.
>
> Seems like migration completes, but then something bad happens on the first
> interrupt. I will investigate a bit now and see if it's an easy fix.

while you do that I will go through the series. My apologies for the delay

Eric
>
> Thanks,
> Joey
>
>> Eric
>>> Thanks,
>>> Joey
>>>
>>> [1] https://lore.kernel.org/kvmarm/20250529135557.2439500-1-joey.gouly@arm.com/
>>>
>>> Alexandru Elisei (2):
>>>   arm64: micro-bench: use smc when at EL2
>>>   arm64: selftest: update test for running at EL2
>>>
>>> Joey Gouly (8):
>>>   arm64: drop to EL1 if booted at EL2
>>>   arm64: efi: initialise SCTLR_ELx fully
>>>   arm64: efi: initialise the EL
>>>   arm64: timer: use hypervisor timers when at EL2
>>>   arm64: micro-bench: fix timer IRQ
>>>   arm64: pmu: count EL2 cycles
>>>   arm64: run at EL2 if supported
>>>   arm64: add EL2 environment variable
>>>
>>>  arm/cstart64.S             | 56 ++++++++++++++++++++++++++++++++++++--
>>>  arm/efi/crt0-efi-aarch64.S |  5 ++++
>>>  arm/micro-bench.c          | 26 ++++++++++++++++--
>>>  arm/pmu.c                  | 13 ++++++---
>>>  arm/run                    |  7 +++++
>>>  arm/selftest.c             | 18 ++++++++----
>>>  arm/timer.c                | 10 +++++--
>>>  lib/acpi.h                 |  2 ++
>>>  lib/arm/asm/setup.h        |  8 ++++++
>>>  lib/arm/asm/timer.h        | 11 ++++++++
>>>  lib/arm/setup.c            |  4 +++
>>>  lib/arm/timer.c            | 19 +++++++++++--
>>>  lib/arm64/asm/sysreg.h     | 19 +++++++++++++
>>>  lib/arm64/processor.c      | 12 ++++++++
>>>  14 files changed, 191 insertions(+), 19 deletions(-)
>>>