From: Avi Kivity <avi@redhat.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
liu ping fan <qemulist@gmail.com>,
qemu-devel@nongnu.org, Blue Swirl <blauwirbel@gmail.com>,
Alex Williamson <alex.williamson@redhat.com>,
Anthony Liguori <anthony@codemonkey.ws>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [RFC v1 0/7] IOMMU support
Date: Mon, 15 Oct 2012 12:45:21 +0200 [thread overview]
Message-ID: <507BE941.7000205@redhat.com> (raw)
In-Reply-To: <1350009361.20486.131.camel@pasglop>
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
next prev parent reply other threads:[~2012-10-15 10:45 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-11 13:26 [Qemu-devel] [RFC v1 0/7] IOMMU support Avi Kivity
2012-10-11 13:26 ` [Qemu-devel] [RFC v1 1/7] memory: fix address space initialization/destruction Avi Kivity
2012-10-11 13:31 ` Paolo Bonzini
2012-10-11 13:33 ` Avi Kivity
2012-10-13 9:14 ` Blue Swirl
2012-10-11 13:26 ` [Qemu-devel] [RFC v1 2/7] memory: limit sections in the radix tree to the actual address space size Avi Kivity
2012-10-11 13:26 ` [Qemu-devel] [RFC v1 3/7] memory: iommu support Avi Kivity
2012-10-11 13:42 ` Paolo Bonzini
2012-10-11 13:45 ` Avi Kivity
2012-10-11 13:54 ` Paolo Bonzini
2012-10-11 13:57 ` Avi Kivity
2012-10-12 2:51 ` Benjamin Herrenschmidt
2012-10-15 16:54 ` Avi Kivity
2012-10-12 2:45 ` Benjamin Herrenschmidt
2012-10-13 9:30 ` Blue Swirl
2012-10-13 11:37 ` Benjamin Herrenschmidt
2012-10-11 14:29 ` Avi Kivity
2012-10-11 13:27 ` [Qemu-devel] [RFC v1 4/7] pci: switch iommu to using the memory API Avi Kivity
2012-10-11 13:53 ` Paolo Bonzini
2012-10-11 13:56 ` Avi Kivity
2012-10-13 9:13 ` Blue Swirl
2012-10-15 10:31 ` Avi Kivity
2012-10-11 13:27 ` [Qemu-devel] [RFC v1 5/7] i440fx: add an iommu Avi Kivity
2012-10-11 13:27 ` [Qemu-devel] [RFC v1 6/7] vfio: abort if an emulated iommu is used Avi Kivity
2012-10-11 13:27 ` [Qemu-devel] [RFC v1 7/7] vhost: " Avi Kivity
2012-10-11 13:31 ` Michael S. Tsirkin
2012-10-11 13:34 ` Avi Kivity
2012-10-11 13:44 ` Michael S. Tsirkin
2012-10-11 13:44 ` Avi Kivity
2012-10-11 14:35 ` Michael S. Tsirkin
2012-10-11 14:35 ` Avi Kivity
2012-10-11 15:34 ` Michael S. Tsirkin
2012-10-11 15:48 ` Avi Kivity
2012-10-11 19:38 ` Alex Williamson
2012-10-15 10:24 ` Avi Kivity
2012-10-15 8:44 ` liu ping fan
2012-10-15 10:32 ` Avi Kivity
2012-10-12 2:36 ` [Qemu-devel] [RFC v1 0/7] IOMMU support Benjamin Herrenschmidt
2012-10-15 10:45 ` Avi Kivity [this message]
2012-10-15 19:52 ` Benjamin Herrenschmidt
2012-10-16 9:30 ` Avi Kivity
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