Dear all, How do I know if TSC scaling is being done when a VM is running in KVM mode? If TSC scaling is being done, how do I calculate the multiplier that needs to be added to host TSC to get guest TSC? For more context, I am running IntelPT and collecting Intel PT traces when a VM Is running in KVM mode and I see that the TSC values differ by a multiplier when the VM is running in root mode (between a vmexit and next vmentry) vs non-root mode (between a vmentry and next vmexit). I use QEMU - 5.2.0 to run a guest and I use an Intel Kaby-Lake microarchitecture. For e.g. The first TSC packet that I get from Intel PT when guest is in root mode is 0xb24d498c651 while the first TSC packet that I get from Intel PT when guest is in non-root mode is 0x4b41048e77. Best Regards, Arnabjyoti Kalita
