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scsi: storvsc: Add Isolation VM support for storvsc driver

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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 vmbus_sendpacket_
mpb_desc() still needs to be handled. Use DMA API(scsi_dma_map/unmap)
to map these memory during sending/receiving packet and return swiotlb
bounce buffer dma address. In Isolation VM, swiotlb  bounce buffer is
marked to be visible to host and the swiotlb force mode is enabled.

Set device's dma min align mask to HV_HYP_PAGE_SIZE - 1 in order to
keep the original data offset in the bounce buffer.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Reviewed-by: Long Li <longli@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20211213071407.314309-5-ltykernel@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Tianyu Lan
2021-12-13 02:14:05 -05:00
committed by Wei Liu
parent 062a5c4260
commit 743b237c3a
3 changed files with 26 additions and 16 deletions
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1
include/linux/hyperv.h
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@@ -1261,6 +1261,7 @@ struct hv_device {
struct vmbus_channel *channel;
struct kset *channels_kset;
struct device_dma_parameters dma_parms;
/* place holder to keep track of the dir for hv device in debugfs */
struct dentry *debug_dir;