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Re: [Qemu-arm] [Qemu-devel] [PATCH 2/2] arm/virt: Mark pcie controller n

From: agraf
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH 2/2] arm/virt: Mark pcie controller node as dma-coherent
Date: Fri, 03 Jun 2016 17:02:50 +0200
User-agent: Roundcube Webmail

On 2016-06-03 16:37, Peter Maydell wrote:
On 3 June 2016 at 15:22, Mihai Claudiu Caraman <address@hidden> wrote:
In particular for virtual and emulated devices the host CPU behaves
as a DMA coherent 'device'. This should have been stated in patch

Wouldn't that imply that we should just always have the "dma-coherent"
property set, and we don't need to do any of the messing around looking
at the host sysfs ?

What happens with VFIO targets that don't have coherent DMA on their PCI bus then? I think eventually we'll need to be able to spawn a second bus with explicit coherency setting.


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