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KVM: selftests: Enable hardware disable test PPC (without pSeries LPAR)

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Enable the hardware disable test for PPC, but skip the test when running
on pSeries LPAR.  The test forks 512 children, each of which does
KVM_CREATE_VM and then SIGKILLs without waiting.  On a PAPR LPAR, that
ioctl is H_GUEST_CREATE and unreaped guests may still occupy L0 Guest
Management Space, which means create can fail with -ENOMEM error.  Skip
the test for now, as making it play nice with pSeries LPAR is non-trivial,
while the test provides meaningful coverage for other flavors of PPC.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Gautam Menghani <gautam@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Acked-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/23f36aab5e9c849719ffeb796e1a74e69eb5d142.1791280439.git.ritesh.list@gmail.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Ritesh Harjani (IBM) 2026-10-06 15:58:42 +05:30 committed by Sean Christopherson
parent e5983ef19a
commit 23140d6e54
2 changed files with 4 additions and 0 deletions
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1
tools/testing/selftests/kvm/Makefile.kvm
View File

@ -258,6 +258,7 @@ TEST_GEN_PROGS_loongarch += steal_time
TEST_GEN_PROGS_powerpc = $(TEST_GEN_PROGS_COMMON)
TEST_GEN_PROGS_powerpc += access_tracking_perf_test
TEST_GEN_PROGS_powerpc += hardware_disable_test
SPLIT_TESTS += arch_timer
SPLIT_TESTS += get-reg-list

3
tools/testing/selftests/kvm/hardware_disable_test.c
View File

@ -130,6 +130,9 @@ int main(int argc, char **argv)
int s, r, cpu, i;
pid_t pid;
/* PowerPC PAPR L0 cannot guarantee 512 overlapping H_GUEST_CREATE from fork+SIGKILL. */
TEST_REQUIRE(!kvm_is_ppc_pseries_lpar());
kvm_sched_getaffinity(0, sizeof(cpu_set_t), &allowed_cpu_set);
for (i = 0; i < NR_VCPUS && CPU_COUNT(&allowed_cpu_set); i++) {