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Dom0less - Xen Developer Summit 2019
1.
© Copyright 2019
Xilinx Stefano Stabellini – Xen Developer Summit July 2019 Xen Dom0-less
2.
© Copyright 2019
Xilinx Traditional Xen System Configuration and Boot >> 2 U-Boot Xen Dom0 DomU 1 DomU 2 CPU0 CPU1 CPU2 boots xl
3.
© Copyright 2019
Xilinx Traditional Xen System Configuration and Boot >> 3 U-Boot Xen Dom0 DomU 1 DomU 2 CPU0 CPU1 CPU2 boots xl quit
4.
© Copyright 2019
Xilinx The problem ˃ Boot Time total > xen + dom0_kernel + dom0_user ˃ Safety Certifications Dom0 doesn’t have to be Linux but it typically is non-Linux Dom0 exit Dom0 after boot ˃ Complexity build-time complexity ‒ Yocto rootfs build runtime flexibility ‒ Monitoring ‒ VMs restart
5.
© Copyright 2019
Xilinx Dom0-less
6.
© Copyright 2019
Xilinx Dom0-less System Configuration and Boot >> 6 U-Boot Xen Dom0 DomU 1 DomU 2 CPU CPU CPU loads into memoryloads into memory
7.
© Copyright 2019
Xilinx Dom0-less System Configuration and Boot >> 7 U-Boot Xen Dom0 DomU 1 DomU 2 CPU CPU CPU boots boots
8.
© Copyright 2019
Xilinx Dom0-less System Configuration and Boot >> 8 U-Boot Xen Dom0 DomU 1 DomU 2 CPU CPU CPU Dom0DomU 3 CPU xl Frontend Backend Dom0-less VMs
9.
© Copyright 2019
Xilinx U-Boot + Device Tree protocol ˃ Load all the required binaries via U-Boot commands tftpb 0x4000000dom0less/mpsoc.dtb tftpb 0x80000 dom0less/Image-dom0 tftpb 0x5000000dom0less/uXen tftpb 0xd000000 dom0less/dom0-ramdisk.cpio.uboot tftpb 0xa000000 dom0less/Image-domU tftpb 0xb000000 dom0less/domU-ramdisk.cpio bootm 0x5000000 0xd000000 0x4000000
10.
© Copyright 2019
Xilinx U-Boot + Device Tree protocol ˃ Advertise and configure Dom0-less VMs via Device Tree domU1 { compatible = "xen,domain"; memory = <0x20000>; cpus = 1; vpl011; module@a000000 { compatible = "multiboot,kernel", "multiboot,module"; reg = <0xa000000 0xffffff>; bootargs = "console=ttyAMA0"; }; module@b0000000 { compatible = "multiboot,ramdisk", "multiboot,module"; reg = <0xb000000 0xffffff>; }; };
11.
© Copyright 2019
Xilinx Dom0-less Device Assignment >> 11 U-Boot Xen Dom0 DomU 1 DomU 2 CPU CPU CPU boots boots Network Card Other Devices
12.
© Copyright 2019
Xilinx Dom0-less Device Assignment ˃ Configured via a nested device tree snippet domU1 { […] module@a000000 { compatible = "multiboot,kernel", "multiboot,module"; reg = <0xa000000 0xffffff>; bootargs = "console=ttyAMA0"; }; module@b0000000 { compatible = "multiboot,ramdisk", "multiboot,module"; reg = <0xb000000 0xffffff>; }; module@c000000 { compatible = "multiboot,device-tree", "multiboot,module"; reg = <0xc0000000xffffff>; }; };
13.
© Copyright 2019
Xilinx Dom0-less Device Assignment ˃ Configured via a nested device tree snippet the device tree node of the device to assign same as for regular DomUs Special properties: ‒ interrupts: interrupts to remap ‒ interrupt-parent: special reference to GIC parent (65000) ‒ xen,path: path to the device node in the main DT ‒ xen,reg: memory to remap /dts-v1/; / { #address-cells = <0x2>; #size-cells = <0x1>; passthrough { compatible = "simple-bus"; ranges; #address-cells = <0x2>; #size-cells = <0x1>; ethernet@ff0e0000 { compatible = "cdns,zynqmp-gem"; status = "okay"; interrupt-parent = <0xfde8>; interrupts = <0x0 0x3f 0x4 0x0 0x3f 0x4>; xen,path = "/amba/ethernet@ff0e0000"; xen,reg= <0x0 0xff0e0000 0x1000 0x0 0xff0e0000>; reg = <0x0 0xff0e0000 0x1000>; clock-names = "pclk", "hclk", "tx_clk", "rx_clk"; #address-cells = <0x1>; #size-cells = <0x0>; […]
14.
© Copyright 2019
Xilinx True Dom0-less >> 14 U-Boot Xen DomU 1 DomU 2 CPU CPU boots boots Network Card PL Block boots
15.
© Copyright 2019
Xilinx Dom0-less and safety critical applications >> 15 U-Boot Xen Dom0 DomU 1 Safety Critical DomU 2 Safety Critical CPU CPU CPU boots boots DomU 3 Non-Critical CPU xl Network Card
16.
© Copyright 2019
Xilinx Dom0-less and PV drivers >> 16 U-Boot Xen DomU 1 DomU 2 CPU CPU boots boots Network Card Netfront boots Netback Doesn’t work today!
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Xilinx Dom0-less Pros & Cons Pros: ˃ Much faster startup times total ~= xen + domU ˃ Enable true Dom0-less configurations Excellent for small systems Easier to certify ˃ Lower Complexity No need for the Xen tools Does not require Yocto, just cross-build Xen No need for Xen support in Dom0-less VMs, no need for CONFIG_XEN Cons: ˃ No monitoring and restarting DomUs without Dom0 ˃ No PV frontends/backends without Dom0
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Xilinx Status & TODO ˃ DONE basic Dom0-less booting upstream in Xen 4.12 device assignment implemented and sent to the list (not upstream) ˃ TODO True Dom0-less Shared memory and interrupts for VM-to-VM communications PV frontends/backends drivers for Dom0-less VMs
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Xilinx Demo
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Xilinx Dom0-less and PVCalls >> 20 U-Boot Xen Dom0 DomU 1 DomU 2 CPU CPU CPU boots boots DomU 3 CPU xl Frontend Backend Network Card
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Xilinx Dom0-less and PVCalls >> 21 U-Boot Xen Dom0 DomU 1 DomU 2 CPU CPU CPU boots DomU 3 CPU xl Frontend Backend Network Card Private Network
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Xilinx Questions?
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