[PATCH v2 4/4] NEWS: qemu: add multi boot device support on s390x

Boris Fiuczynski posted 4 patches 2 weeks ago
[PATCH v2 4/4] NEWS: qemu: add multi boot device support on s390x
Posted by Boris Fiuczynski 2 weeks ago
Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
---
 NEWS.rst | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/NEWS.rst b/NEWS.rst
index 34028d59aa..b79f1d0245 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -17,6 +17,22 @@ v10.10.0 (unreleased)
 
 * **New features**
 
+  * qemu: add multi boot device support on s390x
+
+  For classical mainframe guests (i.e. LPAR or z/VM installations), you always
+  have to explicitly specify the disk where you want to boot from (or "IPL"
+  from, in s390x-speak -- IPL means "Initial Program Load").
+
+  In the past QEMU only used the first device in the boot order to IPL from.
+  With the new multi boot device support on s390x that is available with QEMU
+  version 9.2 and newer, this limitation is lifted. If the IPL fails for the
+  first device with the lowest boot index, the device with the second lowest
+  boot index will be tried and so on until IPL is successful or there are no
+  remaining boot devices to try.
+
+  Limitation: The s390x BIOS will try to IPL up to 8 total devices, any number
+  of which may be disks or network devices.
+
 * **Improvements**
 
 * **Bug fixes**
-- 
2.45.0