linux-kernel - [PATCH 3/4] video: hyperv_fb: Remove support for Hyper-V 2008 and 2008R2/Win7

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Date:   Mon,  2 May 2022 09:36:30 -0700
From:   Michael Kelley <mikelley@...rosoft.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, vkuznets@...hat.com,
        decui@...rosoft.com, drawat.floss@...il.com, airlied@...ux.ie,
        daniel@...ll.ch, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        deller@....de, dri-devel@...ts.freedesktop.org,
        linux-scsi@...r.kernel.org, linux-fbdev@...r.kernel.org
Cc:     mikelley@...rosoft.com
Subject: [PATCH 3/4] video: hyperv_fb: Remove support for Hyper-V 2008 and 2008R2/Win7

The hyperv_fb driver has special case code for running on the first
released versions of Hyper-V: 2008 and 2008 R2/Windows 7.  These versions
are now out of support (except for extended security updates) and lack
support for performance features that are needed for effective production
usage of Linux guests.

The negotiation of the VMbus protocol versions required by these old
Hyper-V versions has been removed from the VMbus driver.  So now remove
the handling of these VMbus protocol versions from the hyperv_fb driver.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 drivers/video/fbdev/hyperv_fb.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index c8e0ea2..7563d54 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -63,6 +63,7 @@
 #define MAX_VMBUS_PKT_SIZE 0x4000
 
 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
+/* Support for VERSION_WIN7 is removed. #define is retained for reference. */
 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
@@ -70,13 +71,7 @@
 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
 
-#define SYNTHVID_DEPTH_WIN7 16
 #define SYNTHVID_DEPTH_WIN8 32
-
-#define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
-#define SYNTHVID_WIDTH_MAX_WIN7 1600
-#define SYNTHVID_HEIGHT_MAX_WIN7 1200
-
 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
 
 #define PCI_VENDOR_ID_MICROSOFT 0x1414
@@ -644,12 +639,6 @@ static int synthvid_connect_vsp(struct hv_device *hdev)
 	case VERSION_WIN8:
 	case VERSION_WIN8_1:
 		ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
-		if (!ret)
-			break;
-		fallthrough;
-	case VERSION_WS2008:
-	case VERSION_WIN7:
-		ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
 		break;
 	default:
 		ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
@@ -661,11 +650,7 @@ static int synthvid_connect_vsp(struct hv_device *hdev)
 		goto error;
 	}
 
-	if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
-		screen_depth = SYNTHVID_DEPTH_WIN7;
-	else
-		screen_depth = SYNTHVID_DEPTH_WIN8;
-
+	screen_depth = SYNTHVID_DEPTH_WIN8;
 	if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
 		ret = synthvid_get_supported_resolution(hdev);
 		if (ret)
@@ -933,9 +918,7 @@ static void hvfb_get_option(struct fb_info *info)
 	    (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
 	    (x * y * screen_depth / 8 > screen_fb_size)) ||
 	    (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
-	     x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
-	    (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
-	     (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
+	     x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8)) {
 		pr_err("Screen resolution option is out of range: skipped\n");
 		return;
 	}
-- 
1.8.3.1