| Message ID | 20240522215755.197363-1-alejandro.j.jimenez@oracle.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [kvm-unit-tests,1/1] x86: vmexit: Allow IPI test to be accelerated by SVM AVIC | expand |
On Wed, 22 May 2024 21:57:55 +0000, Alejandro Jimenez wrote: > The vmexit_ipi test can be used as a rough benchmark for IPI performance > since commit 8a8c1fc3b1f8 ("vmexit: measure IPI and EOI cost") added > reporting of the average number of cycles taken for IPI delivery. Avoid > exposing a PIT to the guest so that SVM AVIC is not inhibited and IPI > acceleration can be tested when available and enabled by the host. > > > [...] Applied to kvm-x86 next, thanks! [1/1] x86: vmexit: Allow IPI test to be accelerated by SVM AVIC https://github.com/kvm-x86/kvm-unit-tests/commit/354b6957994f -- https://github.com/kvm-x86/kvm-unit-tests/tree/next
diff --git a/x86/unittests.cfg b/x86/unittests.cfg index 867a8ea2..70cdda72 100644 --- a/x86/unittests.cfg +++ b/x86/unittests.cfg @@ -81,10 +81,13 @@ file = vmexit.flat extra_params = -append 'inl_from_pmtimer' groups = vmexit +# To allow IPIs to be accelerated by SVM AVIC when the feature is available and +# enabled, do not create a Programmable Interval Timer (PIT, a.k.a 8254), since +# such device will disable/inhibit AVIC if exposed to the guest. [vmexit_ipi] file = vmexit.flat smp = 2 -extra_params = -append 'ipi' +extra_params = -machine pit=off -append 'ipi' groups = vmexit [vmexit_ipi_halt]
The vmexit_ipi test can be used as a rough benchmark for IPI performance since commit 8a8c1fc3b1f8 ("vmexit: measure IPI and EOI cost") added reporting of the average number of cycles taken for IPI delivery. Avoid exposing a PIT to the guest so that SVM AVIC is not inhibited and IPI acceleration can be tested when available and enabled by the host. Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> --- x86/unittests.cfg | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) base-commit: 00af1c849ced4e515f8659658d18652df2eb08fa