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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.156.1; envelope-from=jrossi@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1727398397701116600 Content-Type: text/plain; charset="utf-8" From: Jared Rossi Update docs to show that s390x PC BIOS can support more than one boot devic= e. Signed-off-by: Jared Rossi --- docs/system/bootindex.rst | 7 ++++--- docs/system/s390x/bootdevices.rst | 9 ++++++--- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/docs/system/bootindex.rst b/docs/system/bootindex.rst index 8b057f812f..142ae1a0a2 100644 --- a/docs/system/bootindex.rst +++ b/docs/system/bootindex.rst @@ -49,10 +49,11 @@ Limitations ----------- =20 Some firmware has limitations on which devices can be considered for -booting. For instance, the PC BIOS boot specification allows only one -disk to be bootable. If boot from disk fails for some reason, the BIOS +booting. For instance, the x86 PC BIOS boot specification allows only one +disk to be bootable. If boot from disk fails for some reason, the x86 BIOS won't retry booting from other disk. It can still try to boot from -floppy or net, though. +floppy or net, though. In the case of s390x PC BIOS, the BIOS will try up = to +8 total devices, any number of which may be disks. =20 Sometimes, firmware cannot map the device path QEMU wants firmware to boot from to a boot method. It doesn't happen for devices the firmware diff --git a/docs/system/s390x/bootdevices.rst b/docs/system/s390x/bootdevi= ces.rst index c97efb8fc0..1a1a764c1c 100644 --- a/docs/system/s390x/bootdevices.rst +++ b/docs/system/s390x/bootdevices.rst @@ -6,9 +6,7 @@ Booting with bootindex parameter =20 For classical mainframe guests (i.e. LPAR or z/VM installations), you alwa= ys have to explicitly specify the disk where you want to boot from (or "IPL" = from, -in s390x-speak -- IPL means "Initial Program Load"). In particular, there = can -also be only one boot device according to the architecture specification, = thus -specifying multiple boot devices is not possible (yet). +in s390x-speak -- IPL means "Initial Program Load"). =20 So for booting an s390x guest in QEMU, you should always mark the device where you want to boot from with the ``bootindex`` property, for @@ -17,6 +15,11 @@ example:: qemu-system-s390x -drive if=3Dnone,id=3Ddr1,file=3Dguest.qcow2 \ -device virtio-blk,drive=3Ddr1,bootindex=3D1 =20 +Multiple devices may have a bootindex. The lowest bootindex is assigned to= the +device to IPL first. If the IPL fails for the first, the device with the = second +lowest bootindex will be tried and so on until IPL is successful or there = are no +remaining boot devices to try. + For booting from a CD-ROM ISO image (which needs to include El-Torito boot information in order to be bootable), it is recommended to specify a ``scs= i-cd`` device, for example like this:: --=20 2.45.1