From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tim Deegan <tim@xen.org>
Subject: Re: [PATCH 09/10] log-dirty: Refine common code to
 support PML
Date: Thu, 9 Apr 2015 13:27:51 +0100
Message-ID: <20150409122751.GI17031@deinos.phlegethon.org>
References: <1427423754-11841-1-git-send-email-kai.huang@linux.intel.com>
	<1427423754-11841-10-git-send-email-kai.huang@linux.intel.com>
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To: Kai Huang <kai.huang@linux.intel.com>
Cc: yang.z.zhang@intel.com, andrew.cooper3@citrix.com, kevin.tian@intel.com, jbeulich@suse.com, xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org

At 10:35 +0800 on 27 Mar (1427452553), Kai Huang wrote:
> --- a/xen/arch/x86/mm/paging.c
> +++ b/xen/arch/x86/mm/paging.c
> @@ -411,7 +411,18 @@ static int paging_log_dirty_op(struct domain *d,
>      int i4, i3, i2;
>  
>      if ( !resuming )
> +    {
>          domain_pause(d);
> +
> +        /*
> +         * Only need to flush when not resuming, as domain was paused in
> +         * resuming case therefore it's not possible to have any new dirty
> +         * page.
> +         */
> +        if ( d->arch.paging.log_dirty.flush_cached_dirty )
> +            d->arch.paging.log_dirty.flush_cached_dirty(d);

I think there are too many layers of indirection here. :)  How about:
 - don't add a flush_cached_dirty() function to the log_dirty ops.
 - just call p2m_flush_hardware_cached_dirty(d) here.

Would that work OK?

Cheers,

Tim.