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Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used |
Date: |
Thu, 11 Oct 2012 15:31:55 +0200 |
On Thu, Oct 11, 2012 at 03:27:03PM +0200, Avi Kivity wrote:
> vhost doesn't support guest iommus yet, indicate it to the user
> by gently depositing a core on their disk.
>
> Signed-off-by: Avi Kivity <address@hidden>
Actually there is no problem. virtio bypasses an IOMMU,
so vhost works fine by writing into guest memory directly.
So I don't think we need this patch.
> ---
> hw/vhost.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/hw/vhost.c b/hw/vhost.c
> index 0b4ac3f..cd5d9f5 100644
> --- a/hw/vhost.c
> +++ b/hw/vhost.c
> @@ -451,6 +451,8 @@ static void vhost_region_add(MemoryListener *listener,
> struct vhost_dev *dev = container_of(listener, struct vhost_dev,
> memory_listener);
>
> + assert(!memory_region_is_iommu(section.mr));
> +
> if (!vhost_section(section)) {
> return;
> }
> --
> 1.7.12
Re: [Qemu-devel] [RFC v1 3/7] memory: iommu support, Avi Kivity, 2012/10/11
[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 <=
- 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, 2012/10/11
- 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