From mboxrd@z Thu Jan 1 00:00:00 1970 From: david.vrabel@citrix.com (David Vrabel) Date: Mon, 3 Nov 2014 11:01:49 +0000 Subject: [Xen-devel] [PATCH v7 7/8] xen/arm/arm64: introduce xen_arch_need_swiotlb In-Reply-To: References: <1414422568-19103-7-git-send-email-stefano.stabellini@eu.citrix.com> Message-ID: <5457609D.2000200@citrix.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 03/11/14 10:45, Stefano Stabellini wrote: > On Mon, 27 Oct 2014, Stefano Stabellini wrote: >> Introduce an arch specific function to find out whether a particular dma >> mapping operation needs to bounce on the swiotlb buffer. >> >> On ARM and ARM64, if the page involved is a foreign page and the device >> is not coherent, we need to bounce because at unmap time we cannot >> execute any required cache maintenance operations (we don't know how to >> find the pfn from the mfn). >> >> No change of behaviour for x86. >> >> Signed-off-by: Stefano Stabellini >> Acked-by: Ian Campbell > > Konrad, David, are you OK with the swiotlb-xen changes? Reviewed-by: David Vrabel But swiotlb is Konrad's responsibility. David