Xen VT status and TODO lists for Xen-summit. Arun Sharma, Asit Mallick, Jun Nakajima, Sunil Saxena

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1 Xen VT status and TODO lists for Xen-summit Arun Sharma, Asit Mallick, Jun Nakajima, Sunil Saxena R

2 Outline VMX Guests Status Summary Status Domain0 restructuring PCI/IOAPIC X86-64 VMX guests enhancements Guest FW QEMU Device Models Paravirtualized drivers TODO list 2

3 VMX Guests Status Summary VMX: Full support of 32-bit unmodified Linux guests without FW on IA-32 platforms Includes support of standard PC platform devices 32-bit unmodified Linux guest support without FW added to EM64T Making Good progress on (Q2) Domain0 restructuring PCI/IOAPIC X86-64 support (64-bit unmodified guests) VMX guests enhancements Guest FW In plan (Q3) Device models, paravirtualized drivers SMP support for VMX guests, IPF VT guests, performance, installation 3

4 Domain0 restructuring PCI/IOAPIC Xen IO architecture today Xen enumerates PCI devices Xen partitions the devices among domains Adds complexity to Xen Complex PCI configurations, need for ACPI Many workarounds for PCI hardware bugs needed Proposed Solution Move all PCI device enumeration code to Domain0 Including full support of ACPI Also requires enabling PCI, Local and I/O APIC 4

5 Domain0 restructuring PCI/IOAPIC (cont.) Splitting of Resources and Device Enumeration Xen Domain0 Owns Local APIC, IOAPIC including assignment of interrupt vectors ACPI tables parsing only (no AML interpreter) Full ACPI support Need to map ACPI tables into domain0 Xen passes ACPI table pointer in shared_info_t Local APIC Stubs to satisfy MP parsing IO APIC Accessed by Domain0 using hypercalls Primarily to set interrupt redirection entry PCI Device Enumeration 5

6 Domain0 restructuring PCI/IOAPIC (Status) A patch against xeno-unstable.bk exists and boots on some machines Need to validate on a wider variety of machines Especially ones with complex PCI configurations Other outstanding works MSI support Need to covert Domain0 IRQ to vector (hypercall) Partitioning of devices between domains PCI Hotplug support Hotplug of I/O APICs? 6

7 X Status It s in unstable BK tree Stable and usable Multi-user mode, e.g. login from remote and build the kernel What s left DomU support. Tested to build 32-bit VMX domain SMP support, 32-bit binary support, IOMMU, writable page tables, NUMA support? Performance tuning Running on big machines (# of CPUs, memory, I/O) Need help from community Actively build, test, use. Finish what s left 7

8 X Restructuring Need to have common chipset/platform code among {x86-32, x86-64} x {Linux, XenoLinux} for better code maintenance No compelling reasons for them to be slightly different: time.c, smp.c, smpboot.c, several headers Shared files with x86 as much as possible, but not enough Timer, PCI, microcode, etc. We can use the same code for x86-32 and x86-64 more for xenolinux Initialization Chipset/platform support PCI, APIC, ACPI, interrupt management, most of trap handling, timer management Processor specific part CPU detection, most of context switching SMP support 8

9 X Status VMX guests 32-bit VMX guests are available on both 32-bit and 64-bit VT-x Xen Working on: 64-bit guests support 4-level/3-level shadow mode support Enhanced 32-bit support PAE, execute Disable (XD) support on 64-bit VT-x Xen Extend shadow code to support 4-level cleanly to support both types of guests SMP guest support Local and I/O APIC support Test more on MP systems 9

10 VMX Guests Enhancements: Device Models What we have today Bochs device models providing PS/2 kbd/mouse, CMOS/RTC, Timer (8254), Generic PCI bridge, EIDE, VGA, Serial ports, NMI Ports, Floppy, NIC NE2K (ISA), Local APIC, IOAPIC, CDROM, USB Gaps: SCSI, PCI NIC, IDE-DMA What we are planning to do: switch to QEMU Get PCI NIC and IDE-DMA for free Code written in C Need to implement some functionality (for eg: APIC) either from unstable or Bochs Status: Implementation complete, under regression/performance testing. 10

11 VMX Guests Enhancements: VBD/VNIC Domain 0 Xenolinux Domain N Guest VM (VMX domain) 3P 1P Control Panel (xm/xend) PCI Device (Virtual Event Channel) Native Device Drivers Device Models Backend Virtual driver Callback Req/Resp Ring Buffer VBD VNIC App Event Channel Driver Unmodified Linux FE Virtual Drivers Guest BIOS Virtual Platform VMExit 3D 0D 0P Control Interface Event channel Scheduler Processor Memory I/O: PIT, APIC, PIC PCI, ACPI Xen Hypervisor 11 Event Channel Hypercalls

12 VMX Guests Enhancements: VBD/VNIC Status Basic implementation complete Not integrated with PCI virtual event channel device model Testing/performance analysis in progress Work remaining Use of grant tables instead of mpa 12

13 Guest FW Architecture xm Web client Domain 0 Control Panel Physical Device Drivers 6 xend Device Models PIC IDE SCSI Net Send event - response packet 5 Dispatcher 4 a b Send event - request packet VMX domain Unmodified Linux Emulator/Execution Environment 2 Boot Loader ROM BIOS (Real Mode 0xF000:0) VGA BIOS (Real Mode BIOS Data (Generated by ROM BIOS) 1 c VMExit Arch -> request packet - Decode I/O - Creat request packet Control Interface Port x Scheduler Hypervisor 13 7 Resp ->Arch state Event Channel Processor Memory I/O: PIT, APIC, PIC PCI, ACPI 3 Hypercalls VMexit -> Port n

14 Guest FW Status Real Mode Emulator Implementation complete and integrated into Guest FW execution environment ROM BIOS Using BOCHS/Plex86 ROM BIOS Extended to E820 memory map to be dynamic Adding ACPI support VGA BIOS Using BOCHS/Plex86 VGA BIOS Control Panel Enhancements Enhanced to load Execution environment, ROM BIOS and VGA BIOS in a VMX domain 14

15 TODO > 4 Gig memory support for 32-bit Xen and 32-bit domains PAE support Discontigous memory support in Xen 32-bit/64-bit MP Guests Debugger / Crash dump Performance monitoring tools Scheduler enhancements for load balancing Power-management 15

Optimizing and Enhancing VM for the Cloud Computing Era. 20 November 2009 Jun Nakajima, Sheng Yang, and Eddie Dong

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