KVM on S390x. Revolutionizing the Mainframe

Transcription

1 KVM on S390x Revolutionizing the Mainframe

2 Audience In depth technology High level overview

3 Audience In depth technology High level overview Yes, you get both!

4 S390x? Mainframe Highly available Highly compatible 64 Bit Introduced in 2000 Marketing term: System z

5 Hypervisor? Application Application Linux Hardware

6 Hypervisor? VM Application Application Linux Hypervisor Hardware

7 Hypervisor? VM VM Application Application Application Application Linux Linux Hypervisor Hardware

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9 Virtualization History x Xen KVM S/360 S/360 VM/ /XA z/vm KVM

10 z/vm Virtualization method of choice on S390x Emulates real S390x hardware Can run ancient Operating Systems

11 z/vm Architecture VM VM VM Application Application Application Application Linux z/os Linux z/vm

12 z/vm UI

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15 z/vm UI

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19 z/vm Made for Mainframe OSs Not integrated into Linux More advanced than most other hypervisors

20 KVM

21 What is KVM? Kernel module Creates virtual machine contexts Requires userspace application for device emulation Commonly KVM & Qemu are referred to as KVM

22 KVM History RHEL6 SLES11 SP1 VT-x KVM x86 KVM S390x Qemu S390x

23 KVM Architecture VM VM Application Application Application Linux Linux SLES Qemu Qemu Application KVM Linux

24 KVM UI Direct console mode VNC SDL Currently text output only

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28 KVM UI Considers itself a backend Users only see management software

29 Virtio Paravirtual devices Originated in Lguest Network and block devices of choice for KVM

30 Virtio Device Virtio-Block Virtio-Net Virtio-Serial Ring Virtio-Ring Backend Virtio-PCI Virtio-S390

31 Virtio Shared Code Device Virtio-Block Virtio-Net Virtio-Serial Ring Virtio-Ring Backend Virtio-PCI Virtio-S390

32 Virtio on S390x Only emulated bus type on S390x Virtio-Serial used for console No performance penalties from imitating real hardware

33 S390 Virtio Bus RAM

34 S390 Virtio Bus RAM Device Info Ring1 Ring2 Ring3 Ring...

35 S390 Virtio Bus RAM Device Info Ring1 Ring2 Ring3 Ring... Device Info Device 1 Device 2 Device...

36 S390 Virtio Bus RAM Device Info Ring1 Ring2 Ring3 Ring... Device Info Device 1 Device 2 Device...

37 S390 Virtio Bus RAM Device Info Ring1 Ring2 Ring3 Ring...

38 S390 Virtio Bus RAM Device Info Ring1 Ring2 Ring3 Ring... Ring Processing Done

39 S390 Virtio Bus Hypervisor Ring Virtual Machine

40 S390 Virtio Bus Interrupt Hypervisor Ring Virtual Machine

41 S390 Virtio Bus Interrupt Hypervisor Ring Virtual Machine Hypercall

42 S390 Virtio Bus Very simple Limited space for device descriptors Device overhead above RAM limit

43 Virtio S390 vs PCI S390 PCI Configuration RAM MMIO / PIO Interrupts S390 specific MSI Poke Hypercall MMIO / PIO Hotplug

44 S390 Virtio Machine Fully paravirtual machine Uses virtio-serial for console virtio-block for block virtio-net for network virtio-rng for random number generation Linux only

45 Why? Easy to use Flexible Linux way of doing things Big ecosystem

46 Virt-Manager

47 Virt-Manager

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49 ovirt

50 IBM Test Cloud

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55 KVM vs z/vm Linux only Tightly integrated Opens up new possibilities Easier to use KSM

56 KVM vs z/vm Lacking features Very fast development Room for coexistence!

57 Demo