linux-kernel - Re: [PATCH v4 2/3] KVM-INTEL: Add new module vmcsinfo-intel to fill VMCSINFO

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Message-Id: <20120706.170410.119097767.d.hatayama@jp.fujitsu.com>
Date:	Fri, 06 Jul 2012 17:04:10 +0900 (JST)
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	zhangyanfei@...fujitsu.com
Cc:	avi@...hat.com, mtosatti@...hat.com, dzickus@...hat.com,
	luto@....edu, kvm@...r.kernel.org, joerg.roedel@....com,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	paul.gortmaker@...driver.com, ludwig.nussel@...e.de,
	ebiederm@...ssion.com, gregkh@...uxfoundation.org
Subject: Re: [PATCH v4 2/3] KVM-INTEL: Add new module vmcsinfo-intel to
 fill VMCSINFO

From: Yanfei Zhang <zhangyanfei@...fujitsu.com>
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

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