linux-kernel - Re: [PATCH 0/2] dma,x86,xen: fix dma_get_required

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Message-ID: <20140512152858.GI2837@phenom.dumpdata.com>
Date:	Mon, 12 May 2014 11:28:58 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	xen-devel@...ts.xenproject.org,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH 0/2] dma,x86,xen: fix dma_get_required_mask() when dma !=
 phys address

On Mon, May 12, 2014 at 11:15:40AM +0100, David Vrabel wrote:
> x86 uses the generic dma_get_required_mask() which assumes that DMA
> address == physical address.  For Xen PV guests this is not the case
> and certain drivers will cause excessive use of the SWIOTLB.
> 
> Patch #1 is a straight forward refactoring of a common function.
> 
> Patch #2 addes the required arch-specific implementation of
> dma_get_required_mask() to x86.

David,

Thank you for taking a look at that. If you would like, you can
tack on Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

And with the *SWIOTLB maintainer hat on - you can add that tag
as well.

Thanks!
> 
> David
> 
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