On Sat, Nov 12, 2011 at 11:04 AM, Stepan Moskovchenko
step...@codeaurora.org wrote:
Yes, the scatterlist is allowed to have different page sizes. But, they are
required to have a length that is a multiple of 4K. If a page in the list is
An element in scatterlist may not be aligned by 4K but I
On Thu, Nov 10, 2011 at 07:28:39PM +, David Woodhouse wrote:
... which implies that a mapping, once made, might *never* actually get
torn down until we loop and start reusing address space? That has
interesting security implications.
Yes, it is a trade-off between security and
On Thu, Nov 10, 2011 at 01:12:00PM -0800, Stepan Moskovchenko wrote:
I have been experimenting with an iommu_map_range call, which maps a
given scatterlist of discontiguous physical pages into a contiguous
virtual region at a given IOVA. This has some performance advantages
over just calling
On Fri, 2011-11-11 at 13:58 +0100, Joerg Roedel wrote:
For AMD IOMMU there is a feature called not-present cache. It says that
the IOMMU caches non-present entries as well and needs an IOTLB flush
when something is mapped (meant for software implementations of the
IOMMU).
So it can't be
On Fri, Nov 11, 2011 at 01:27:28PM +, David Woodhouse wrote:
On Fri, 2011-11-11 at 13:58 +0100, Joerg Roedel wrote:
For AMD IOMMU there is a feature called not-present cache. It says that
the IOMMU caches non-present entries as well and needs an IOTLB flush
when something is mapped
On 11/11/2011 5:24 AM, Joerg Roedel wrote:
On Thu, Nov 10, 2011 at 01:12:00PM -0800, Stepan Moskovchenko wrote:
I have been experimenting with an iommu_map_range call, which maps a
given scatterlist of discontiguous physical pages into a contiguous
virtual region at a given IOVA. This has some
On 11/10/2011 03:31 PM, Ohad Ben-Cohen wrote:
On Thu, Nov 10, 2011 at 8:17 AM, Kai Huangmail.kai.hu...@gmail.com wrote:
Seems the unmap function don't take phys as parameter, does this mean
domain-ops-unmap will walk through the page table to find out the
actual page size?
The short
On Thu, Nov 10, 2011 at 08:16:16PM +0800, cody wrote:
On 11/10/2011 03:31 PM, Ohad Ben-Cohen wrote:
On Thu, Nov 10, 2011 at 8:17 AM, Kai Huangmail.kai.hu...@gmail.com wrote:
Seems the unmap function don't take phys as parameter, does this mean
domain-ops-unmap will walk through the page table
On 11/10/2011 09:08 PM, Joerg Roedel wrote:
On Thu, Nov 10, 2011 at 08:16:16PM +0800, cody wrote:
On 11/10/2011 03:31 PM, Ohad Ben-Cohen wrote:
On Thu, Nov 10, 2011 at 8:17 AM, Kai Huangmail.kai.hu...@gmail.com wrote:
Seems the unmap function don't take phys as parameter,
On Thu, Nov 10, 2011 at 10:35:34PM +0800, cody wrote:
Yes I totally agree page-size is not required for unmap operations
and should not be added as parameter to map/unmap operations. I am
not saying the unmap operation, but the IOTLB flush operation. My
point is we also may also need to add
On Thu, 2011-11-10 at 14:17 +0800, Kai Huang wrote:
And another question: have we considered the IOTLB flush operation? I
think we need to implement similar logic when flush the DVMA range.
Intel VT-d's manual says software needs to specify the appropriate
mask value to flush large pages, but
On Thu, Nov 10, 2011 at 03:28:50PM +, David Woodhouse wrote:
Which brings me to another question I have been pondering... do we even
have a consensus on exactly *when* the IOTLB should be flushed?
Well, sort of, there is still the outstanding idea of the
iommu_commit() interface for the
On Thu, 2011-11-10 at 18:09 +0100, Joerg Roedel wrote:
The requirement for the DMA-API is, that the IOTLB must be consistent
with existing mappings, and only with the parts that are really mapped.
The unmapped parts are not important.
This allows nice optimizations like your 'batched unmap'
On 11/10/2011 9:09 AM, Joerg Roedel wrote:
The plan is to have a single DMA-API implementation for all IOMMU
drivers (X86 and ARM) which just uses the IOMMU-API. But to make this
performing reasonalbly well a few changes to the IOMMU-API are
required. I already have some ideas which we can
-int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int
gfp_order)
+size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t
size)
{
- size_t size, unmapped;
+ size_t unmapped_page, unmapped = 0;
+ unsigned int min_pagesz;
if
On Thu, Nov 10, 2011 at 8:17 AM, Kai Huang mail.kai.hu...@gmail.com wrote:
Seems the unmap function don't take phys as parameter, does this mean
domain-ops-unmap will walk through the page table to find out the
actual page size?
The short answer is yes, and furthermore, we also consider to
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