On Wed, 28 Aug 2024 16:30:04 +
Michael Kelley wrote:
> From: Petr Tesařík Sent: Wednesday, August 28, 2024 6:04 AM
> >
> > On Wed, 28 Aug 2024 13:02:31 +0100
> > Robin Murphy wrote:
> >
> > > On 2024-08-22 7:37 pm, mhkelle...@gmail.com w
On Wed, 28 Aug 2024 13:02:31 +0100
Robin Murphy wrote:
> On 2024-08-22 7:37 pm, mhkelle...@gmail.com wrote:
> > From: Michael Kelley
> >
> > Background
> > ==
> > Linux device drivers may make DMA map/unmap calls in contexts that
> > cannot block, such as in an interrupt handler. Conseq
On Tue, 27 Aug 2024 17:30:59 +
Michael Kelley wrote:
> From: Petr Tesařík Sent: Tuesday, August 27, 2024 8:56 AM
> >
> > On Fri, 23 Aug 2024 20:41:15 +
> > Michael Kelley wrote:
> >
> > > From: Petr Tesařík Sent: Friday, August 23, 2024 12:41
&
On Fri, 23 Aug 2024 20:41:15 +
Michael Kelley wrote:
> From: Petr Tesařík Sent: Friday, August 23, 2024 12:41 AM
> >
> > On Thu, 22 Aug 2024 11:37:12 -0700
> > mhkelle...@gmail.com wrote:
>[...]
> > > @@ -71,12 +72,15 @@
> > > *
On Tue, 27 Aug 2024 00:26:36 +
Michael Kelley wrote:
> From: Petr Tesařík Sent: Monday, August 26, 2024 12:28 PM
> >
> > On Mon, 26 Aug 2024 16:24:53 +
> > Michael Kelley wrote:
> >
> > > From: Petr Tesařík Sent: Saturday, August 24, 2024
&g
On Mon, 26 Aug 2024 16:24:53 +
Michael Kelley wrote:
> From: Petr Tesařík Sent: Saturday, August 24, 2024 1:06 PM
> >
> > On Fri, 23 Aug 2024 20:40:16 +
> > Michael Kelley wrote:
> >
> > > From: Petr Tesařík Sent: Thurs
On Fri, 23 Aug 2024 20:40:16 +
Michael Kelley wrote:
> From: Petr Tesařík Sent: Thursday, August 22, 2024 11:45 PM
>[...]
> > > Discussion
> > > ==
> > > * Since swiotlb isn't visible to device drivers, I've specifically
> >
On Fri, 23 Aug 2024 20:42:08 +
Michael Kelley wrote:
> From: Petr Tesařík Sent: Friday, August 23, 2024 1:03 AM
> >
> > On Thu, 22 Aug 2024 11:37:13 -0700
> > mhkelle...@gmail.com wrote:
> >
> > > From: Michael Kelley
> > >
> > &g
On Thu, 22 Aug 2024 11:37:18 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> In a CoCo VM, all DMA-based I/O must use swiotlb bounce buffers
> because DMA cannot be done to private (encrypted) portions of VM
> memory. The bounce buffer memory is marked shared (decrypted) at
> boot t
On Thu, 22 Aug 2024 11:37:17 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> The NVMe setting that controls the BLK_MQ_F_BLOCKING flag on the
> request queue is currently a flag in struct nvme_ctrl_ops, where
> it is not writable. A new use case needs this flag to be writable
> base
On Thu, 22 Aug 2024 11:37:16 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> In a CoCo VM, all DMA-based I/O must use swiotlb bounce buffers
> because DMA cannot be done to private (encrypted) portions of VM
> memory. The bounce buffer memory is marked shared (decrypted) at
> boot t
On Thu, 22 Aug 2024 11:37:15 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> Extend the SCSI DMA mapping interfaces by adding the "_attrs" variant
> of scsi_dma_map(). This variant allows passing DMA_ATTR_* values, such
> as is needed to support swiotlb throttling. The existing scsi
On Thu, 22 Aug 2024 11:37:14 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> With the addition of swiotlb throttling functionality, storage
> device drivers may want to know whether using the DMA_ATTR_MAY_BLOCK
> attribute is useful. In a CoCo VM or environment where swiotlb=force
>
On Thu, 22 Aug 2024 11:37:13 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> When a DMA map request is for a SGL, each SGL entry results in an
> independent mapping operation. If the mapping requires a bounce buffer
> due to running in a CoCo VM or due to swiotlb=force on the boot l
On Thu, 22 Aug 2024 11:37:12 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> Implement throttling of swiotlb map requests. Because throttling requires
> temporarily pending some requests, throttling can only be used by map
> requests made in contexts that can block. Detecting such c
Hi all,
upfront, I've had more time to consider this idea, because Michael
kindly shared it with me back in February.
On Thu, 22 Aug 2024 11:37:11 -0700
mhkelle...@gmail.com wrote:
> From: Michael Kelley
>
> Background
> ==
> Linux device drivers may make DMA map/unmap calls in context
On Fri, 23 Aug 2024 02:20:41 +
Michael Kelley wrote:
> From: Bart Van Assche Sent: Thursday, August 22, 2024
> 12:29 PM
> >
> > On 8/22/24 11:37 AM, mhkelle...@gmail.com wrote:
> > > Linux device drivers may make DMA map/unmap calls in contexts that
> > > cannot block, such as in an inte
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