linux-kernel - [PATCH hyperv-next 6/6] drivers: SCSI: Do not bounce-bufffer for the confidential VMBus

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Message-ID: <20250409000835.285105-7-romank@linux.microsoft.com>
Date: Tue,  8 Apr 2025 17:08:35 -0700
From: Roman Kisel <romank@...ux.microsoft.com>
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Subject: [PATCH hyperv-next 6/6] drivers: SCSI: Do not bounce-bufffer for the confidential VMBus

The device bit that indicates that the device is capable of I/O
with private pages lets avoid excessive copying in the Hyper-V
SCSI driver.

Set that bit equal to the confidential external memory one to
not bounce buffer

Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
---
 drivers/scsi/storvsc_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index a8614e54544e..f647f8fc2f8f 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -686,6 +686,8 @@ static void handle_sc_creation(struct vmbus_channel *new_sc)
 	struct vmstorage_channel_properties props;
 	int ret;
 
+	dev->use_priv_pages_for_io = new_sc->confidential_external_memory;
+
 	stor_device = get_out_stor_device(device);
 	if (!stor_device)
 		return;
-- 
2.43.0