Hi KVM community, I am trying to figure out how TSC is virtualized in KVM-VMX world. According to the kernel documentation, reading TSC register through MSR can be trapped into KVM and VMX. I am trying to figure out the KVM code handing this trap. In order to understand it, I have run a kernel traced by GDB, and added break points to the code I thought they may handle the MSR trap, e.g., kvm_get_msr, vmx_exec_control, etc. Then ran rdtsc from guest application, however, it didn’t trigger these breakpoints. I am a little lost in how TSC is virtualized. Two questions: - does the TSC MRS instructions are emulated and trapped into KVM? - if TSC is trapped, which code handles it? Any background about TSC virtualization and suggestions on tracing its virtualization are appreciated. Thank you, Yifei
