On 21.11.2019 16:26, Rishi wrote: > The affected Linux driver in my case is coretemp.ko (drivers/hwmon/coretemp.c) > > It's init depends on checking presence of X86_FEATURE_DTHERM > > /* > * CPUID.06H.EAX[0] indicates whether the CPU has thermal > * sensors. We check this bit only, all the early CPUs > * without thermal sensors will be filtered out. > */ > > It seems to use below MSR > MSR_IA32_PACKAGE_THERM_STATUS > MSR_IA32_THERM_STATUS > MSR_IA32_TEMPERATURE_TARGET > > I'm not sure how can CPUID.06H.EAX[0] be read, should Xen provide a > hypercall interface to read this? > Even if a hypercall is given, coretemp will have to be modified to > separate MSR calls.
A hypercall exists (XENPF_resource_op), and would just need extension. It could e.g. permit access to said MSRs when CPUID.06H.EAX[0] is 1. The coretemp driver would of course need modification (or cloning). Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
