While x86 does not require any additional setup to use the ucall
infrastructure, arm64 needs to set up the MMIO address used to signal a
ucall to userspace. rseq_test does not initialize the MMIO address,
resulting in the test spinning indefinitely.
Fix the issue by calling ucall_init() during setup.
Fixes: 61e52f1630f5 ("KVM: selftests: Add a test for KVM_RUN+rseq to detect task migration bugs")
Signed-off-by: Oliver Upton <oupton@xxxxxxxxxx>
---
tools/testing/selftests/kvm/rseq_test.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/kvm/rseq_test.c b/tools/testing/selftests/kvm/rseq_test.c
index 060538bd405a..c5e0dd664a7b 100644
--- a/tools/testing/selftests/kvm/rseq_test.c
+++ b/tools/testing/selftests/kvm/rseq_test.c
@@ -180,6 +180,7 @@ int main(int argc, char *argv[])
* CPU affinity.
*/
vm = vm_create_default(VCPU_ID, 0, guest_code);
+ ucall_init(vm, NULL);
pthread_create(&migration_thread, NULL, migration_worker, 0);
--
2.33.0.685.g46640cef36-goog
