On Fri, Aug 20, 2021 at 03:40:08PM +, Michael Kelley wrote:
> I see that the swiotlb code gets and uses the min_align_mask field. But
> the NVME driver is the only driver that ever sets it, so the value is zero
> in all other cases. Does swiotlb just use PAGE_SIZE in that that case? I
> coul
On Sat, Aug 21, 2021 at 02:04:11AM +0800, Tianyu Lan wrote:
> After dma_map_sg(), we still need to go through scatter list again to
> populate payload->rrange.pfn_array. We may just go through the scatter list
> just once if dma_map_sg() accepts a callback and run it during go
> through scatter l
From: Tianyu Lan Sent: Friday, August 20, 2021 11:04 AM
>
> On 8/21/2021 12:08 AM, Michael Kelley wrote:
> }
> >>> The whole approach here is to do dma remapping on each individual page
> >>> of the I/O buffer. But wouldn't it be possible to use dma_map_sg() to map
> >>> each scatt
On 8/21/2021 12:08 AM, Michael Kelley wrote:
}
The whole approach here is to do dma remapping on each individual page
of the I/O buffer. But wouldn't it be possible to use dma_map_sg() to map
each scatterlist entry as a unit? Each scatterlist entry describes a range of
physically co
From: Tianyu Lan Sent: Friday, August 20, 2021 8:20 AM
>
> On 8/20/2021 2:17 AM, Michael Kelley wrote:
> > From: Tianyu Lan Sent: Monday, August 9, 2021 10:56 AM
> >
> > I'm not clear on why payload->range.offset needs to be set again.
> > Even after the dma mapping is done, doesn't the offset i
On 8/20/2021 12:32 PM, h...@lst.de wrote:
On Thu, Aug 19, 2021 at 06:17:40PM +, Michael Kelley wrote:
+#define storvsc_dma_map(dev, page, offset, size, dir) \
+ dma_map_page(dev, page, offset, size, dir)
+
+#define storvsc_dma_unmap(dev, dma_range, dir) \
+ dma
From: h...@lst.de Sent: Thursday, August 19, 2021 9:33 PM
>
> On Thu, Aug 19, 2021 at 06:17:40PM +, Michael Kelley wrote:
> > >
> > > @@ -1824,6 +1848,13 @@ static int storvsc_queuecommand(struct Scsi_Host
> > > *host, struct scsi_cmnd *scmnd)
> > > payload->range.len = length;
> >
On 8/20/2021 11:20 PM, Tianyu Lan wrote:
The whole approach here is to do dma remapping on each individual page
of the I/O buffer. But wouldn't it be possible to use dma_map_sg() to
map
each scatterlist entry as a unit? Each scatterlist entry describes a
range of
physically contiguous memory
On 8/20/2021 2:17 AM, Michael Kelley wrote:
From: Tianyu Lan Sent: Monday, August 9, 2021 10:56 AM
Subject line tag should be "scsi: storvsc:"
In Isolation VM, all shared memory with host needs to mark visible
to host via hvcall. vmbus_establish_gpadl() has already done it for
storvsc r
On Thu, Aug 19, 2021 at 06:17:40PM +, Michael Kelley wrote:
> > +#define storvsc_dma_map(dev, page, offset, size, dir) \
> > + dma_map_page(dev, page, offset, size, dir)
> > +
> > +#define storvsc_dma_unmap(dev, dma_range, dir) \
> > + dma_unmap_page(dev, dma_range.dma,
From: Tianyu Lan Sent: Monday, August 9, 2021 10:56 AM
>
Subject line tag should be "scsi: storvsc:"
> In Isolation VM, all shared memory with host needs to mark visible
> to host via hvcall. vmbus_establish_gpadl() has already done it for
> storvsc rx/tx ring buffer. The page buffer used by vm
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