On 03/19/2012 01:31 PM, Avi Kivity wrote:
On 03/16/2012 12:19 AM, Daniel Lezcano wrote:Hi all, I recently did some modification in the cpuidle core and the patches were merge to linux-next. Someone reported a problem with the intel_idle cpuidle driver. I tried to reproduce the problem with kvm but the kernel fails to intialize the driver because of intel_intel_init function fails in the processor probe. After digging a bit, I found it fails at: drivers/idle/intel_idle.c static int intel_idle_probe(void) { ... if (boot_cpu_data.cpuid_level< CPUID_MWAIT_LEAF) return -ENODEV; ^^^^^ ... } I assumed the virtualized processor does not support this, so I specified the "-cpu host" because the host was running the intel_idle driver. But the driver still fails in kvm. I was wondering why that happens ? Does anyone have an idea of this problem ?intel_idle() uses mwait, which kvm does not virtualize (it's very expensive to do so and brings no benefits).
Ok, thanks for the information. I was afraid of that :/ I will go to for a real host then :) Thanks ! -- Daniel -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
