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From: David Vrabel <david.vrabel@citrix.com>
To: <linux-kernel@vger.kernel.org>
CC: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, <x86@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        <xen-devel@lists.xenproject.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        David Vrabel <david.vrabel@citrix.com>
Subject: [PATCH 0/2] dma,x86,xen: fix dma_get_required_mask() when dma != phys address
Date: Mon, 12 May 2014 11:15:40 +0100
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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