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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2019-05-20 13:31:02 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-05-24 21:27:10 +0200 |
| commit | 204c91eff798a78498cc7cbf1bc76892badfa96d (patch) | |
| tree | cd9516683048d89eaba676657df4ac615b86c52c /tools/testing/selftests/vm | |
| parent | KVM: selftests: Remove duplicated TEST_ASSERT in hyperv_cpuid.c (diff) | |
| download | linux-dev-204c91eff798a78498cc7cbf1bc76892badfa96d.tar.xz linux-dev-204c91eff798a78498cc7cbf1bc76892badfa96d.zip | |
KVM: selftests: do not blindly clobber registers in guest asm
The guest_code of sync_regs_test is assuming that the compiler will not
touch %r11 outside the asm that increments it, which is a bit brittle.
Instead, we can increment a variable and use a dummy asm to ensure the
increment is not optimized away. However, we also need to use a
callee-save register or the compiler will insert a save/restore around
the vmexit, breaking the whole idea behind the test.
(Yes, "if it ain't broken...", but I would like the test to be clean
before it is copied into the upcoming s390 selftests).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/testing/selftests/vm')
0 files changed, 0 insertions, 0 deletions