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Re: [Qemu-devel] [RFC v1 0/7] IOMMU support
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [RFC v1 0/7] IOMMU support |
Date: |
Mon, 15 Oct 2012 12:45:21 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 |
On 10/12/2012 04:36 AM, Benjamin Herrenschmidt wrote:
> On Thu, 2012-10-11 at 15:26 +0200, Avi Kivity wrote:
>> These patches add IOMMU support to the memory core. IOMMUs can be added
>> anywhere in
>> the memory hierarchy, and may be arranged in series.
>
> I haven't had a chance to review in details yet, but one thing I noticed
> is that you basically have a single read/write protection information
> for a translation.
>
> This is a loss of functionality to some extent (well, maybe not from the
> existing iommu layer but from what could be done by our HW) in that we
> have separate read and write permission bits.
>
> This is actually worth fixing I think. Catching incorrect reads from
> write-only regions is probably worth it in term of debugging drivers.
>
I do have an is_write parameter to translate, in fact I added it in
order to implement the spapr iommu. Or do you mean something else?
--
error compiling committee.c: too many arguments to function
- Re: [Qemu-devel] [RFC v1 7/7] vhost: abort if an emulated iommu is used, (continued)
- 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
- 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
- Re: [Qemu-devel] [RFC v1 0/7] IOMMU support,
Avi Kivity <=