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| 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 description.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.
Alex
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