selftests: KVM: Call ucall_init when setting up in rseq_test

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

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@google.com>
Message-Id: <20210923220033.4172362-1-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

authored by

Oliver Upton and committed by

Paolo Bonzini 4 years ago fbf094ce 6bc6db00

1 changed file

expand all

tools

testing

selftests

kvm

rseq_test.c

tools/testing/selftests/kvm/rseq_test.c

··· 180 180 * CPU affinity. 181 181 */ 182 182 vm = vm_create_default(VCPU_ID, 0, guest_code); 183 + ucall_init(vm, NULL); 183 184 184 185 pthread_create(&migration_thread, NULL, migration_worker, 0); 185 186

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