linux-kernel - [PATCH 2/2] Drivers: hv: util: Specify ring buffer size using Hyper-V page size

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Message-Id: <20190725050315.6935-3-himadri18.07@gmail.com>
Date:   Thu, 25 Jul 2019 05:03:15 +0000
From:   Himadri Pandya <himadrispandya@...il.com>
To:     mikelley@...rosoft.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, sashal@...nel.org
Cc:     linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        Himadri Pandya <himadri18.07@...il.com>
Subject: [PATCH 2/2] Drivers: hv: util: Specify ring buffer size using Hyper-V page size

VMbus ring buffers are sized based on the 4K page size used by
Hyper-V. The Linux guest page size may not be 4K on all architectures
so use the Hyper-V page size to specify the ring buffer size.

Signed-off-by: Himadri Pandya <himadri18.07@...il.com>
---
 drivers/hv/hv_util.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index c2c08f26bd5f..766bd8457346 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -413,8 +413,9 @@ static int util_probe(struct hv_device *dev,
 
 	hv_set_drvdata(dev, srv);
 
-	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
-			srv->util_cb, dev->channel);
+	ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE,
+			 4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb,
+			 dev->channel);
 	if (ret)
 		goto error;
 
-- 
2.17.1