diff --git a/virdevmapper-Handle-kernel-without-device-mapper-sup.patch b/virdevmapper-Handle-kernel-without-device-mapper-sup.patch
new file mode 100644
index 0000000..ba25626
--- /dev/null
+++ b/virdevmapper-Handle-kernel-without-device-mapper-sup.patch
@@ -0,0 +1,79 @@
+From 83298f3086380c9b3b3ec39a2d6bf7b33592683b Mon Sep 17 00:00:00 2001
+From: Michal Privoznik <mprivozn@redhat.com>
+Date: Tue, 18 Aug 2020 11:04:24 +0200
+Subject: [PATCH] virdevmapper: Handle kernel without device-mapper support
+
+In one of my latest patch (v6.6.0~30) I was trying to remove
+libdevmapper use in favor of our own implementation. However, the
+code did not take into account that device mapper can be not
+compiled into the kernel (e.g. be a separate module that's not
+loaded) in which case /proc/devices won't have the device-mapper
+major number and thus virDevMapperGetTargets() and/or
+virIsDevMapperDevice() fails.
+
+However, such failure is safe to ignore, because if device mapper
+is missing then there can't be any multipath devices and thus we
+don't need to allow the deps in CGroups, nor create them in the
+domain private namespace, etc.
+
+Fixes: 22494556542c676d1b9e7f1c1f2ea13ac17e1e3e
+Reported-by: Andrea Bolognani <abologna@redhat.com>
+Reported-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
+Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
+Reviewed-by: Peter Krempa <pkrempa@redhat.com>
+Reviewed-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
+Tested-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
+---
+ src/util/virdevmapper.c | 20 ++++++++++++++++++--
+ 1 file changed, 18 insertions(+), 2 deletions(-)
+
+diff --git a/src/util/virdevmapper.c b/src/util/virdevmapper.c
+index b43dbefa9a..a81e2edee4 100644
+--- a/src/util/virdevmapper.c
++++ b/src/util/virdevmapper.c
+@@ -54,6 +54,9 @@ virDevMapperGetMajor(unsigned int *major)
+     VIR_AUTOSTRINGLIST lines = NULL;
+     size_t i;
+ 
++    if (!virFileExists(CONTROL_PATH))
++        return -2;
++
+     if (virFileReadAll(PROC_DEVICES, BUF_SIZE, &buf) < 0)
+         return -1;
+ 
+@@ -126,8 +129,13 @@ virDMOpen(void)
+ 
+     memset(&dm, 0, sizeof(dm));
+ 
+-    if ((controlFD = open(CONTROL_PATH, O_RDWR)) < 0)
++    if ((controlFD = open(CONTROL_PATH, O_RDWR)) < 0) {
++        if (errno == ENOENT)
++            return -2;
++
++        virReportSystemError(errno, _("Unable to open %s"), CONTROL_PATH);
+         return -1;
++    }
+ 
+     if (!virDMIoctl(controlFD, DM_VERSION, &dm, &tmp)) {
+         virReportSystemError(errno, "%s",
+@@ -300,8 +308,16 @@ virDevMapperGetTargets(const char *path,
+      * consist of devices or yet another targets. If that's the
+      * case, we have to stop recursion somewhere. */
+ 
+-    if ((controlFD = virDMOpen()) < 0)
++    if ((controlFD = virDMOpen()) < 0) {
++        if (controlFD == -2) {
++            /* The CONTROL_PATH doesn't exist. Probably the
++             * module isn't loaded, yet. Don't error out, just
++             * exit. */
++            return 0;
++        }
++
+         return -1;
++    }
+ 
+     return virDevMapperGetTargetsImpl(controlFD, path, devPaths, ttl);
+ }
+-- 
+2.27.0
+