linux-kernel - Re: [PATCH 2/4] KVM: VMX: Add functions to fill VMCSINFO

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Message-ID: <4F85454E.6020201@redhat.com>
Date:	Wed, 11 Apr 2012 11:48:14 +0300
From:	Avi Kivity <avi@...hat.com>
To:	zhangyanfei <zhangyanfei@...fujitsu.com>
CC:	mtosatti@...hat.com, ebiederm@...ssion.com, luto@....edu,
	joerg.roedel@....com, dzickus@...hat.com,
	paul.gortmaker@...driver.com, gregkh@...e.de,
	ludwig.nussel@...e.de, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH 2/4] KVM: VMX: Add functions to fill VMCSINFO

On 04/11/2012 04:50 AM, zhangyanfei wrote:
> This patch is to implement the feature that at initialization of
> kvm_intel module, fills VMCSINFO with a VMCS revision identifier,
> and encoded offsets of VMCS fields. The reason why we put the
> VMCSINFO processing at the initialization of kvm_intel module
> is that it's dangerous to rob VMX resources while kvm module is
> loaded.

Maybe it should be done by a separate module.

> +
> +	kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id())));
> +	vmcs_load(vmcs);

Should do this after writing into the vmcs directly (vmcs_load() may
cache some information for vmcs_read()).

> +
> +	VMCSINFO_REVISION_ID(vmcs->revision_id);
> +
> +	/*
> +	 * Write encoded offsets into VMCS data for later vmcs_read.
> +	 */
> +	for (offset = FIELD_START; offset < vmcs_config.size;
> +	     offset += sizeof(u16))
> +		*(u16 *)((char *)vmcs + offset) = ENCODING_OFFSET(offset);

This assumes vmcs field contents use the same encoding as
vmread/vmwrite.  I guess it's a reasonable assumption.


-- 
error compiling committee.c: too many arguments to function

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