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: Mon, 13 Jul 2015 16:45:18 +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
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On Mon, Jul 13, 2015 at 2:52 PM, Ian Campbell <ian.campbell@citrix.com> wrote:
> On Sat, 2015-07-11 at 20:19 +0530, Vijay Kilari wrote:
>> >> +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
>
> Ah, then please reverse the order so that the variable comes first and
> the target comes second.
>
> Also I think you need to find a better name that "cmd_write_save".
> Something which indicates the progress made perhaps? But why isn't this
> just cmd_read? Why the separate progress pointer?

I will check If I can use cmd_read.

BTW, I want to know if atomic_t supports 64-bit access?.
I have not made cmd_read as atomic_t.