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[85.223.209.22]) by smtp.gmail.com with ESMTPSA id w21sm11720548lfl.84.2019.07.31.01.10.56 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 31 Jul 2019 01:10:57 -0700 (PDT) From: Viktor Mitin To: xen-devel@lists.xenproject.org Date: Wed, 31 Jul 2019 11:10:41 +0300 Message-Id: <20190731081041.25256-1-viktor.mitin.19@gmail.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v4] xen/doc: Improve Dom0-less documentation X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Viktor Mitin , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Tim Deegan , Julien Grall , Jan Beulich , Viktor Mitin Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP - Changed unprintable characters with %s/\%xA0/ /g So all the spaces are 0x20 now. - Added address-cells and size-cells to configuration example. This resolves the dom0less boot issue in case of arm64. - Added some notes about xl tools usage in case of dom0less. Signed-off-by: Viktor Mitin Acked-by: Julien Grall --- v4 updates: - fixed cpus <1>; - added memory size note; - changed some numbers to decimal; --- docs/features/dom0less.pandoc | 61 ++++++++++++++++++++++++----------- 1 file changed, 42 insertions(+), 19 deletions(-) -- 2.17.1 diff --git a/docs/features/dom0less.pandoc b/docs/features/dom0less.pandoc index e076e3739e..a2c95d1fd4 100644 --- a/docs/features/dom0less.pandoc +++ b/docs/features/dom0less.pandoc @@ -40,8 +40,8 @@ to boot. For example if this is the bootcmd for Xen and Dom0: bootm 0x1400000 0x9000000 0x1280000 -If we want to add one DomU with Image-DomU as the DomU kernel -and ramdisk-DomU as DomU ramdisk: +If we want to add one DomU with Image-DomU as the DomU kernel +and ramdisk-DomU as DomU ramdisk: tftpb 0x1280000 xen.dtb tftpb 0x80000 xen-Image @@ -61,27 +61,32 @@ the presence of the additional VM and its configuration. It is done via device tree adding a node under /chosen as follows: domU1 { -     compatible = "xen,domain"; -     memory = <0x20000>; -    cpus = 1; -     vpl011; - -     module@2000000 { -         compatible = "multiboot,kernel", "multiboot,module"; -         reg = <0x2000000 0xffffff>; -         bootargs = "console=ttyAMA0"; -     }; - -     module@30000000 { -         compatible = "multiboot,ramdisk", "multiboot,module"; -         reg = <0x3000000 0xffffff>; -     }; + #address-cells = <1>; + #size-cells = <1>; + compatible = "xen,domain"; + memory = <0 524288>; + cpus = <1>; + vpl011; + + module@2000000 { + compatible = "multiboot,kernel", "multiboot,module"; + reg = <0x2000000 0xffffff>; + bootargs = "console=ttyAMA0"; + }; + + module@30000000 { + compatible = "multiboot,ramdisk", "multiboot,module"; + reg = <0x3000000 0xffffff>; + }; }; -Where memory is the memory of the VM in KBs, cpus is the number of -cpus. module@2000000 and module@3000000 advertise where the kernel and +Where memory is the memory of the VM in KBs, cpus is the number of +cpus. module@2000000 and module@3000000 advertise where the kernel and ramdisk are in memory. +Note: the size specified should exactly match the size of the Kernel/initramfs. +Otherwise, they may be unusable in Xen (for instance if they are compressed). + See docs/misc/arm/device-tree/booting.txt for more information. Limitations @@ -111,3 +116,21 @@ limitations: the Xen command line. The NULL scheduler automatically assigns and pins vCPUs to pCPUs, but the vCPU-pCPU assignments cannot be configured. + +Notes +----- + +- 'xl console' command will not attach to the domain's console in case + of dom0less. DomU are domains created by Xen (similar to Dom0) and + therefore they are all managed by Xen and some of the commands may not work. + + A user is allowed to configure the key sequence to switch input. + Pressing the Xen "conswitch" (Ctrl-A by default) three times + switches input in case of dom0less mode. + +- Domains created by Xen will have no name at boot. Domain-0 has a name + thanks to the helper xen-init-dom0 called at boot by the initscript. + If you want to setup DomU name, then you will have to create the xenstore + node associated. By default DomU names are shown as '(null)' in the + xl domains list. +