On Tue, Jul 27, 2021 at 04:10:44PM +0530, Praveen Kumar wrote: [...] > > @@ -170,9 +185,21 @@ static int hv_cpu_die(unsigned int cpu) > > hv_common_cpu_die(cpu); > > - if (hv_vp_assist_page && hv_vp_assist_page[cpu]) > + if (hv_vp_assist_page && hv_vp_assist_page[cpu]) { > wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, 0); > The content of the MSR should be preserved; otherwise you hit the same fault for root kernel. Wei.