1008-libxl-Force-emulating-readonly-disks-as-SCSI.patch

From 16441a7526d355dc4150e30cd1062b6626de2305 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Wed, 16 Nov 2022 01:48:34 +0100
Subject: [PATCH] libxl: Force emulating readonly disks as SCSI
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IDE and AHCI emulation in qemu-xen does not support read-only disks.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
 tools/libs/light/libxl_dm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libs/light/libxl_dm.c b/tools/libs/light/libxl_dm.c
index 7fd53df13ed0..ed2772ab0456 100644
--- a/tools/libs/light/libxl_dm.c
+++ b/tools/libs/light/libxl_dm.c
@@ -1364,7 +1364,7 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
             if (disks[i].is_cdrom) {
                 continue;
             }
-            if (strncmp(disks[i].vdev, "sd", 2) == 0) {
+            if (strncmp(disks[i].vdev, "sd", 2) == 0 || !disks[i].readwrite) {
                 flexarray_vappend(dm_args, "-device", "lsi53c895a", NULL);
                 break;
             }
@@ -1952,7 +1952,7 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
                     colo_mode = LIBXL__COLO_NONE;
                 }
 
-                if (strncmp(disks[i].vdev, "sd", 2) == 0) {
+                if (strncmp(disks[i].vdev, "sd", 2) == 0 || !disks[i].readwrite) {
                     const char *drive_id;
                     if (colo_mode == LIBXL__COLO_SECONDARY) {
                         drive = libxl__sprintf
-- 
2.44.0