On 9/4/19 2:22 PM, Christoph Hellwig wrote:
On Wed, Sep 04, 2019 at 09:32:30AM +0200, Thomas Hellström (VMware) wrote:
That sounds great. Is there anything I can do to help out? I thought this
was more or less a dead end since the current dma_mmap_ API requires the
mmap_sem to be held in write
On Wed, Sep 04, 2019 at 09:32:30AM +0200, Thomas Hellström (VMware) wrote:
> That sounds great. Is there anything I can do to help out? I thought this
> was more or less a dead end since the current dma_mmap_ API requires the
> mmap_sem to be held in write mode (modifying the vma->vm_flags)
On 9/4/19 8:58 AM, Christoph Hellwig wrote:
On Tue, Sep 03, 2019 at 10:46:18PM +0200, Thomas Hellström (VMware) wrote:
What I mean with "from an engineering perspective" is that drivers would end
up with a non-trivial amount of code supporting purely academic cases:
Setups where software
On Tue, Sep 3, 2019 at 1:46 PM Thomas Hellström (VMware)
wrote:
>
> On 9/3/19 6:22 PM, Christoph Hellwig wrote:
> > On Tue, Sep 03, 2019 at 04:32:45PM +0200, Thomas Hellström (VMware) wrote:
> >> Is this a layer violation concern, that is, would you be ok with a similar
> >> helper for TTM, or is
On 9/3/19 6:22 PM, Christoph Hellwig wrote:
On Tue, Sep 03, 2019 at 04:32:45PM +0200, Thomas Hellström (VMware) wrote:
Is this a layer violation concern, that is, would you be ok with a similar
helper for TTM, or is it that you want to force the graphics drivers into
adhering strictly to the
On 9/3/19 5:14 PM, Dave Hansen wrote:
On 9/3/19 6:15 AM, Thomas Hellström (VMware) wrote:
The force_dma_unencrypted symbol is needed by TTM to set up the correct
page protection when memory encryption is active. Export it.
It would be great if this had enough background that I didn't have to
On Tue, Sep 03, 2019 at 04:32:45PM +0200, Thomas Hellström (VMware) wrote:
> Is this a layer violation concern, that is, would you be ok with a similar
> helper for TTM, or is it that you want to force the graphics drivers into
> adhering strictly to the DMA api, even when it from an engineering
>
On 9/3/19 6:15 AM, Thomas Hellström (VMware) wrote:
> The force_dma_unencrypted symbol is needed by TTM to set up the correct
> page protection when memory encryption is active. Export it.
It would be great if this had enough background that I didn't have to
look at patch 4 to figure out what TTM
Hi, Christoph,
On 9/3/19 3:46 PM, Christoph Hellwig wrote:
On Tue, Sep 03, 2019 at 03:15:01PM +0200, Thomas Hellström (VMware) wrote:
From: Thomas Hellstrom
The force_dma_unencrypted symbol is needed by TTM to set up the correct
page protection when memory encryption is active. Export it.
On Tue, Sep 03, 2019 at 03:15:01PM +0200, Thomas Hellström (VMware) wrote:
> From: Thomas Hellstrom
>
> The force_dma_unencrypted symbol is needed by TTM to set up the correct
> page protection when memory encryption is active. Export it.
NAK. This is a helper for the core DMA code and drivers
From: Thomas Hellstrom
The force_dma_unencrypted symbol is needed by TTM to set up the correct
page protection when memory encryption is active. Export it.
Cc: Dave Hansen
Cc: Andy Lutomirski
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
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