From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vijay Kilari <vijay.kilari@gmail.com>
Subject: Re: [PATCH v4 07/17] xen/arm: ITS: Add virtual ITS
	commands support
Date: Sat, 11 Jul 2015 20:19:10 +0530
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To: Ian Campbell <ian.campbell@citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Prasun Kapoor <Prasun.Kapoor@caviumnetworks.com>, Vijaya Kumar K <vijaya.kumar@caviumnetworks.com>, Tim Deegan <tim@xen.org>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Julien Grall <julien.grall@citrix.com>, Stefano Stabellini <stefano.stabellini@citrix.com>, manish.jaggi@caviumnetworks.com
List-Id: xen-devel@lists.xenproject.org

>> +int vgic_its_process_cmd(struct vcpu *v, struct vgic_its *vits)
>> +{
>> +    its_cmd_block virt_cmd;
>> +
>> +    ASSERT(spin_is_locked(&vits->lock));
>> +
>> +    do {
>> +        if ( vgic_its_read_virt_cmd(v, vits, &virt_cmd) )
>> +            goto err;
>> +        if ( vgic_its_parse_its_command(v, vits, &virt_cmd) )
>> +            goto err;
>> +        vgic_its_update_read_ptr(v, vits);
>> +    } while ( vits->cmd_write != vits->cmd_write_save );
>
> I can't find anywhere other than here where vits->cmd_write is touched.
> What am I missing?

   It is written by guest by GITS_CWRITER emulation in patch #9