* ppc64le kunit test failure: guest_state_buffer_test
@ 2026-06-03 6:42 Eric Biggers
2026-06-03 7:33 ` Vaibhav Jain
0 siblings, 1 reply; 4+ messages in thread
From: Eric Biggers @ 2026-06-03 6:42 UTC (permalink / raw)
To: linuxppc-dev, kvm, Vaibhav Jain
FYI, the KUnit test arch/powerpc/kvm/test-guest-state-buffer.c is
failing when run in QEMU PPC64LE:
[ 146.554299][ T1] KTAP version 1^M
[ 146.554348][ T1] # Subtest: guest_state_buffer_test^M
[ 146.554543][ T1] # module: test_guest_state_buffer^M
[ 146.554927][ T1] 1..7^M
[ 146.556873][ T1] ok 1 test_creating_buffer^M
[ 146.558221][ T1] ok 2 test_adding_element^M
[ 146.559532][ T1] ok 3 test_gs_bitmap^M
[ 146.560309][ T1] ok 4 test_gs_parsing^M
[ 146.561246][ T1] ok 5 test_gs_msg^M
[ 146.562116][ T1] ok 6 test_gs_hostwide_msg^M
[ 146.562911][ T428] # test_gs_hostwide_counters: ASSERTION FAILED at arch/powerpc/kvm/test-guest-state-buffer.c:488^M
[ 146.562911][ T428] Expected rc == 0, but^M
[ 146.562911][ T428] rc == -2 (0xfffffffffffffffe)^M
[ 146.563600][ T1] not ok 7 test_gs_hostwide_counters^M
[ 146.563653][ T1] # guest_state_buffer_test: pass:6 fail:1 skip:0 total:7^M
Tested on next-20260602. I haven't bisected it.
Note that this test is in the defconfig.
- Eric
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ppc64le kunit test failure: guest_state_buffer_test
2026-06-03 6:42 ppc64le kunit test failure: guest_state_buffer_test Eric Biggers
@ 2026-06-03 7:33 ` Vaibhav Jain
2026-06-03 7:40 ` Eric Biggers
0 siblings, 1 reply; 4+ messages in thread
From: Vaibhav Jain @ 2026-06-03 7:33 UTC (permalink / raw)
To: Eric Biggers, linuxppc-dev, kvm
Hi Eric,
Thanks for trying and reporting this. This kunit test depends on
availablility of Qemu commit 5f7d861e("spapr: nested: Add support for
reporting Hostwide state counter ") [1] that was merged in v10.0.0.
Since you havent mentioned the qemu version used I assume its a version
< v10.0.0 . With the qemu patch available you should see this test
passing with results similar to as originally described in original
cover letter of the patch series at [2] that introduced this kunit test.
[1] https://gitlab.com/qemu-project/qemu/-/commit/5f7d861e65d90e0446b8f22a0bc859a5d8058ea6
[2] https://lore.kernel.org/all/20250416162740.93143-1-vaibhav@linux.ibm.com/
Eric Biggers <ebiggers@kernel•org> writes:
> FYI, the KUnit test arch/powerpc/kvm/test-guest-state-buffer.c is
> failing when run in QEMU PPC64LE:
>
> [ 146.554299][ T1] KTAP version 1^M
> [ 146.554348][ T1] # Subtest: guest_state_buffer_test^M
> [ 146.554543][ T1] # module: test_guest_state_buffer^M
> [ 146.554927][ T1] 1..7^M
> [ 146.556873][ T1] ok 1 test_creating_buffer^M
> [ 146.558221][ T1] ok 2 test_adding_element^M
> [ 146.559532][ T1] ok 3 test_gs_bitmap^M
> [ 146.560309][ T1] ok 4 test_gs_parsing^M
> [ 146.561246][ T1] ok 5 test_gs_msg^M
> [ 146.562116][ T1] ok 6 test_gs_hostwide_msg^M
> [ 146.562911][ T428] # test_gs_hostwide_counters: ASSERTION FAILED at arch/powerpc/kvm/test-guest-state-buffer.c:488^M
> [ 146.562911][ T428] Expected rc == 0, but^M
> [ 146.562911][ T428] rc == -2 (0xfffffffffffffffe)^M
> [ 146.563600][ T1] not ok 7 test_gs_hostwide_counters^M
> [ 146.563653][ T1] # guest_state_buffer_test: pass:6 fail:1 skip:0 total:7^M
>
> Tested on next-20260602. I haven't bisected it.
>
> Note that this test is in the defconfig.
>
> - Eric
>
--
Cheers
~ Vaibhav
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ppc64le kunit test failure: guest_state_buffer_test
2026-06-03 7:33 ` Vaibhav Jain
@ 2026-06-03 7:40 ` Eric Biggers
2026-06-03 11:25 ` Vaibhav Jain
0 siblings, 1 reply; 4+ messages in thread
From: Eric Biggers @ 2026-06-03 7:40 UTC (permalink / raw)
To: Vaibhav Jain; +Cc: linuxppc-dev, kvm
On Wed, Jun 03, 2026 at 01:03:09PM +0530, Vaibhav Jain wrote:
> Hi Eric,
>
> Thanks for trying and reporting this. This kunit test depends on
> availablility of Qemu commit 5f7d861e("spapr: nested: Add support for
> reporting Hostwide state counter ") [1] that was merged in v10.0.0.
>
> Since you havent mentioned the qemu version used I assume its a version
> < v10.0.0 . With the qemu patch available you should see this test
> passing with results similar to as originally described in original
> cover letter of the patch series at [2] that introduced this kunit test.
>
> [1] https://gitlab.com/qemu-project/qemu/-/commit/5f7d861e65d90e0446b8f22a0bc859a5d8058ea6
>
> [2] https://lore.kernel.org/all/20250416162740.93143-1-vaibhav@linux.ibm.com/
Nope, it fails even on the master branch of QEMU.
- Eric
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ppc64le kunit test failure: guest_state_buffer_test
2026-06-03 7:40 ` Eric Biggers
@ 2026-06-03 11:25 ` Vaibhav Jain
0 siblings, 0 replies; 4+ messages in thread
From: Vaibhav Jain @ 2026-06-03 11:25 UTC (permalink / raw)
To: Eric Biggers; +Cc: linuxppc-dev, kvm
Hi Eric,
I just successfully tested this kunit test on kernel tag next-20260602
and qemu master HEAD == 405c32d2b18a("Merge tag 'pull-tpm-2026-06-01-1'
of https://github.com/stefanberger/qemu-tpm into staging") [1]
If you are using Qemu >= v10.0.0 then the kunit test failure you
reported is due to Qemu not enabling 'cap-nested-papr' capability which
is needed to enable KVM-HV Apiv2 support in Qemu.
Without 'cap-nested-papr' Qemu doesnt register the H_GUEST_GET_STATE
Hcall which this kunit test relies on. Hence it returns -2 (H_FUNCTION)
for this unsupported HCall. The failure of kunit 'test_gs_hostwide_msg'
is expected as the underlying hypervisor doesnt have support nested-papr
APIv2 capability.
To fix this please enable qemu-system-ppc64 machine's capability
cap-nested-papr to enable nested-papr APIv2 support.
Below is the test log showing successful 'guest_state_buffer_test' kunit
test passing :
$ ./qemu-system-ppc64 --version
QEMU emulator version 11.0.50 (v11.0.0-1621-g405c32d2b1)
Copyright (c) 2003-2026 Fabrice Bellard and the QEMU Project developers
# kunit test is specific to nested-papr APIv2 so qemu cap-nested-papr needs to be enabled
$ ./qemu-system-ppc64 -display none -nographic -kernel ~/linux/vmlinux
-machine pseries,cap-nested-papr=true
<snip>
Booting from memory...
OF stdout device is: /vdevice/vty@71000000
Preparing to boot Linux version 7.1.0-rc6-next-20260602 (vaibhav@*********) (gcc (GCC) 16.1.1 20260515 (Red Hat 16.1.1-2), GNU ld version 2.46-3.fc44) #2 SMP PREEMPT Wed Jun 3 04:11:38 CDT 2026
Detected machine type: 0000000000000101
<snip>
[ 4.335850][ T1] KTAP version 1
[ 4.335896][ T1] # Subtest: guest_state_buffer_test
[ 4.335946][ T1] # module: test_guest_state_buffer
[ 4.335970][ T1] 1..7
[ 4.337296][ T1] ok 1 test_creating_buffer
[ 4.338998][ T1] ok 2 test_adding_element
[ 4.341996][ T1] ok 3 test_gs_bitmap
[ 4.343406][ T1] ok 4 test_gs_parsing
[ 4.345607][ T1] ok 5 test_gs_msg
[ 4.347247][ T1] ok 6 test_gs_hostwide_msg
[ 4.348012][ T131] # test_gs_hostwide_counters: Guest Heap Size=0 bytes
[ 4.348183][ T131] # test_gs_hostwide_counters: Guest Heap Size Max=0 bytes
[ 4.348350][ T131] # test_gs_hostwide_counters: Guest Page-table Size=0 bytes
[ 4.348653][ T131] # test_gs_hostwide_counters: Guest Page-table Size Max=0 bytes
[ 4.348813][ T131] # test_gs_hostwide_counters: Guest Page-table Reclaim Size=0 bytes
[ 4.349354][ T1] ok 7 test_gs_hostwide_counters
[ 4.349569][ T1] # guest_state_buffer_test: pass:7 fail:0 skip:0 total:7
[ 4.349635][ T1] # Totals: pass:7 fail:0 skip:0 total:7
[ 4.349708][ T1] ok 4 guest_state_buffer_test
Can you try adding 'cap-nested-papr=true' to the Qemu machine you are
using and see if the problem resolves for you. If it persists can you
please share the Qemu command line you are using.
[1] https://gitlab.com/qemu-project/qemu/-/commit/405c32d2b18a683ba36301351af75125d9afda08
Eric Biggers <ebiggers@kernel•org> writes:
> On Wed, Jun 03, 2026 at 01:03:09PM +0530, Vaibhav Jain wrote:
>> Hi Eric,
>>
>> Thanks for trying and reporting this. This kunit test depends on
>> availablility of Qemu commit 5f7d861e("spapr: nested: Add support for
>> reporting Hostwide state counter ") [1] that was merged in v10.0.0.
>>
>> Since you havent mentioned the qemu version used I assume its a version
>> < v10.0.0 . With the qemu patch available you should see this test
>> passing with results similar to as originally described in original
>> cover letter of the patch series at [2] that introduced this kunit test.
>>
>> [1] https://gitlab.com/qemu-project/qemu/-/commit/5f7d861e65d90e0446b8f22a0bc859a5d8058ea6
>>
>> [2] https://lore.kernel.org/all/20250416162740.93143-1-vaibhav@linux.ibm.com/
>
> Nope, it fails even on the master branch of QEMU.
>
> - Eric
--
Cheers
~ Vaibhav
^ permalink raw reply [flat|nested] 4+ messages in thread
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2026-06-03 6:42 ppc64le kunit test failure: guest_state_buffer_test Eric Biggers
2026-06-03 7:33 ` Vaibhav Jain
2026-06-03 7:40 ` Eric Biggers
2026-06-03 11:25 ` Vaibhav Jain
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