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Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used |
Date: |
Thu, 11 Oct 2012 17:48:14 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 |
On 10/11/2012 05:34 PM, Michael S. Tsirkin wrote:
> On Thu, Oct 11, 2012 at 04:35:23PM +0200, Avi Kivity wrote:
>> On 10/11/2012 04:35 PM, Michael S. Tsirkin wrote:
>>
>> >> No, qemu should configure virtio devices to bypass the iommu, even if it
>> >> is on.
>> >
>> > Okay so there will be some API that virtio devices should call
>> > to achieve this?
>>
>> The iommu should probably call pci_device_bypasses_iommu() to check for
>> such devices.
>
> So maybe this patch should depend on the introduction of such
> an API.
I've dropped it for now.
In fact, virtio/vhost are safe since they use cpu_physical_memory_rw()
and the memory listener watches address_space_memory, no iommu there.
vfio needs to change to listen to pci_dev->bus_master_as, and need
special handling for iommu regions (abort for now, type 2 iommu later).
--
error compiling committee.c: too many arguments to function
- [Qemu-devel] [RFC v1 5/7] i440fx: add an iommu, (continued)
- [Qemu-devel] [RFC v1 5/7] i440fx: add an iommu, Avi Kivity, 2012/10/11
- [Qemu-devel] [RFC v1 6/7] vfio: abort if an emulated iommu is used, Avi Kivity, 2012/10/11
- [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Avi Kivity, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Michael S. Tsirkin, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Avi Kivity, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Michael S. Tsirkin, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Avi Kivity, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Michael S. Tsirkin, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Avi Kivity, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Michael S. Tsirkin, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used,
Avi Kivity <=
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Alex Williamson, 2012/10/11
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Avi Kivity, 2012/10/15
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, liu ping fan, 2012/10/15
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, Avi Kivity, 2012/10/15
Re: [Qemu-devel] [RFC v1 0/7] IOMMU support, Benjamin Herrenschmidt, 2012/10/11