From: David Woodhouse <dwmw@amazon.co.uk>
Date: Thu, 6 Feb 2025 10:25:07 +0000 (+0000)
Subject: hw/xen: Add "mode" parameter to xen-block devices
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=0a322951f0346057f103ba47f40b9fef8fde9105;p=users%2Fdwmw2%2Fqemu.git

hw/xen: Add "mode" parameter to xen-block devices

Block devices don't work in PV Grub (0.9x) if there is no mode specified. It
complains: "Error ENOENT when reading the mode"

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---

diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c
index 034a18b70e..e61eab466c 100644
--- a/hw/block/xen-block.c
+++ b/hw/block/xen-block.c
@@ -408,6 +408,8 @@ static void xen_block_realize(XenDevice *xendev, Error **errp)
     }
 
     xen_device_backend_printf(xendev, "info", "%u", blockdev->info);
+    xen_device_backend_printf(xendev, "mode",
+                              (blockdev->info & VDISK_READONLY) ? "r" : "w");
 
     xen_device_frontend_printf(xendev, "virtual-device", "%lu",
                                vdev->number);