linux-kernel - [PATCH 08/15] Drivers: hv: balloon: Fix info request to show max page count

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Message-Id: <1477899710-28675-8-git-send-email-kys@exchange.microsoft.com>
Date:   Mon, 31 Oct 2016 00:41:43 -0700
From:   kys@...hange.microsoft.com
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        vkuznets@...hat.com, jasowang@...hat.com,
        leann.ogasawara@...onical.com, sthemmin@...rosoft.com
Cc:     Alex Ng <alexng@...sages.microsoft.com>,
        Alex Ng <alexng@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 08/15] Drivers: hv: balloon: Fix info request to show max page count

From: Alex Ng <alexng@...sages.microsoft.com>

Balloon driver was only printing the size of the info blob and not the
actual content. This fixes it so that the info blob (max page count as
configured in Hyper-V) is printed out.

Signed-off-by: Alex Ng <alexng@...rosoft.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/hv_balloon.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 8cac29a..14c3dc4 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1034,8 +1034,13 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
 
 	switch (info_hdr->type) {
 	case INFO_TYPE_MAX_PAGE_CNT:
-		pr_info("Received INFO_TYPE_MAX_PAGE_CNT\n");
-		pr_info("Data Size is %d\n", info_hdr->data_size);
+		if (info_hdr->data_size == sizeof(__u64)) {
+			__u64 *max_page_count = (__u64 *)&info_hdr[1];
+
+			pr_info("INFO_TYPE_MAX_PAGE_CNT = %llu\n",
+				*max_page_count);
+		}
+
 		break;
 	default:
 		pr_info("Received Unknown type: %d\n", info_hdr->type);
-- 
1.7.4.1