From: Yanfei Zhang <zhangyanfei@xxxxxxxxxxxxxx> Subject: [PATCH v4 2/3] KVM-INTEL: Add new module vmcsinfo-intel to fill VMCSINFO Date: Wed, 4 Jul 2012 18:05:19 +0800 > Besides, this patch also exports vmcs revision identifier via > /sys/devices/system/cpu/vmcs_id and offsets of fields via > /sys/devices/system/cpu/vmcs/. > Individual offsets are contained in subfiles named by the filed's > encoding, e.g.: /sys/devices/cpu/vmcs/0800 According to the discussion starting from http://lkml.indiana.edu/hypermail/linux/kernel/1105.3/00749.html system can be composed of CPUs with different steppings or differnet microcode revisions. Becase of the nature that it's hided in the specification, I suspect layout of vmcs could change across different steppings or microcode revisions. Then, the interface needs to be changed as per-cpu like /sys/devices/cpu/cpu0/vmcs/0800 /sys/devices/cpu/cpu1/vmcs/0800 ... /sys/devices/cpu/cpuN/vmcs/0800 Also, processing of vmcsinfo initialization needs to be done per cpu, and can be triggered when cpu is added not when kvm module is loaded. Thanks. HATAYAMA, Daisuke
