> On Dec 2, 2019, at 12:43 PM, Aaron Lewis <aaronlewis@xxxxxxxxxx> wrote:
>
> Verify that the difference between a guest RDTSC instruction and the
> IA32_TIME_STAMP_COUNTER MSR value stored in the VMCS12's VM-exit
> MSR-store list is less than 750 cycles, 99.9% of the time.
>
> 662f1d1d1931 ("KVM: nVMX: Add support for capturing highest observable L2 TSC”)
>
> Signed-off-by: Aaron Lewis <aaronlewis@xxxxxxxxxx>
> Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>
Running this test on bare-metal I get:
Test suite: rdtsc_vmexit_diff_test
FAIL: RDTSC to VM-exit delta too high in 117 of 100000 iterations
Any idea why? Should I just play with the 750 cycles magic number?
