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Virtual Machine Monitors spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth ADRIAN PERRIG & TORSTEN HOEFLER Our small quiz Networks and Operating Systems (252-0062-00) Chapter 11: Virtual Machine Monitors . True or false (raise hand) . Spooling can be used to improve access times A SIGINT in time saves a kill -9 . Buffering can cope with device speed mismatches . The Linux kernel identifies devices using a single number . From userspace, devices in Linux are identified through files . Standard BSD sockets require two or more copies at the host . Network protocols are processed in the first level interrupt handler . The second level interrupt handler copies the packet data to userspace . Deferred procedure calls can be executed in any process context . Unix mbufs (and skbufs) enable protocol-independent processing . Network I/O is not performance-critical . NAPI’s design aims to reduce the CPU load . NAPI uses polling to accelerate packet processing . TCP offload reduces the server CPU load . TCP offload can accelerate applications 2 spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Receive-side scaling Receive-side scaling . Observations: . Too much traffic for one core to handle Flow table Received . Cores aren’t getting any faster packet Must parallelize across cores . Key idea: handle different flows on different cores pointer Flow state: . But: how to determine flow for each packet? • IP src + dest • Ring buffer . Can’t do this on a core: same problem! • TCP src + dest • Message-signalled interrupt Etc. Solution: demultiplex on the NIC Hash of . DMA packets to per-flow buffers / queues packet . Send interrupt only to core handling flow header DMA Core to address interrupt spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Receive-side scaling . Can balance flows across cores . Note: doesn’t help with one big flow! . Assumes: . n cores processing m flows is faster than one core . Hence: . Network stack and protocol graph must scale on a multiprocessor. Multiprocessor scaling: topic for later (see DPHPC class) Virtual Machine Monitors Literature: Barham et al.: Xen and the art of virtualization and Anderson, Dahlin: Operating Systems: Principles and Practice, Chapter 14 6 spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Virtual Machine Monitors What is a Virtual Machine Monitor? . Basic definitions . Virtualizes an entire (hardware) machine . Why would you want one? . Contrast with OS processes . Structure . Interface provided is “illusion of real hardware” . How does it work? . Applications are therefore complete Operating Systems themselves . Terminology: Guest Operating Systems . CPU . MMU . Memory . Old idea: IBM VM/CMS (1960s) . Devices . Recently revived: VMware, Xen, Hyper-V, kvm, etc. • Acknowledgement: . Network Thanks to Steve Hand for some of the slides! spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth VMMs and hypervisors Why would you want one? . Server consolidation (program assumes own machine) . Performance isolation . Backward compatibility . Cloud computing (unit of selling cycles) App App App App Some folks . OS development/testing distinguish the . Something under the OS: replay, auditing, trusted computing, Virtual Machine Guest Guest Monitor from the rootkits operating operating Hypervisor system system (we won’t) Creates illusion of VMM VMM hardware Hypervisor Real hardware spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Running multiple OSes on one machine Server consolidation . Application . Many applications compatibility assume they have . I use Debian for almost everything, the machine to but I edit slides in themselves App App App App App App PowerPoint . Each machine is Application Application . Some people Application compile Barrelfish in mostly idle a Debian VM over Windows 7 with Consolidate Hyper-V servers onto a single physical . Backward machine compatibility Hypervisor Hypervisor . Nothing beats a Windows 98 virtual Real hardware machine for playing Real hardware old computer games spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Resource isolation Cloud computing . Surprisingly, . Selling computing modern OSes do capacity on Application not have an Application demand abstraction for a . E.g. Amazon EC2, Application Application single application Hypervisor GoGrid, etc. Application Application Application Application Application Real hardware . Performance Hypervisor . Hypervisors Application Real hardware Application isolation can be Hypervisor decouple Application critical in some Real hardware Application allocation of Hypervisor Application enterprises Real hardware Application resources (VMs) Hypervisor . Use virtual Real hardware from provisioning Hypervisor Real hardware of infrastructure Hypervisor machines as resource (physical machines) Real hardware containers spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Operating System development Other cool applications… . Building and . Tracing testing a new OS . Debugging without needing . Execution replay to reboot real . Lock-step Visual Visual Studio Editor hardware Tracer Application Application Compiler execution . VMM often gives you more . Live migration information about . Rollback faults than real . Speculation hardware anyway . Etc…. Hypervisor Hypervisor Real hardware Real hardware spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth How does it all work? Hosted VMMs . Note: a hypervisor is basically an OS . With an “unusual API” . Many functions quite similar: . Multiplexing resources . Scheduling, virtual memory, device drivers App App Examples: . Different: • VMware workstation . Creating the illusion of hardware to “applications” Guest • Linux KVM . Guest OSes are less flexible in resource requirements operating • Microsoft Hyper-V Application Application system • VirtualBox VMM Host operating system Real hardware spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Hypervisor-based VMMs How to virtualize… . The CPU (s)? . The MMU? . Physical memory? . Devices (disks, etc.)? App App App App Mgmt. Examples: . The Network Console • VMware ESX Console • IBM VM/CMS Guest Guest and? (Mgmt) • Xen operating operating operating system system system VMM VMM VMM Hypervisor Real hardware spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Virtualizing the CPU Virtualizing the CPU . A CPU architecture is strictly virtualizable if it can be perfectly . A strictly virtualizable processor can execute a complete native emulated over itself, with all non-privileged instructions Guest OS executed natively . Guest applications run in user mode as before . Guest kernel works exactly as before . Privileged instructions trap . Kernel-mode (i.e., the VMM) emulates instruction . Problem: x86 architecture is not virtualizable . Guest’s kernel mode is actually user mode . About 20 instructions are sensitive but not privileged Or another, extra privilege level (such as ring 1) . Mostly segment loads and processor flag manipulation . Examples: IBM S/390, Alpha, PowerPC spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Non-virtualizable x86: example Solutions . PUSHF/POPF instructions 1. Emulation: emulate all kernel-mode code in software . Push/pop condition code register . Very slow – particularly for I/O intensive workloads . Includes interrupt enable flag (IF) . Used by, e.g., SoftPC 2. Paravirtualization: modify Guest OS kernel . Unprivileged instructions: fine in user space! . Replace critical calls with explicit trap instruction to VMM . IF is ignored by POPF in user mode, not in kernel mode . Also called a “HyperCall” (used for all kinds of things) . Used by, e.g., Xen VMM can’t determine if Guest OS wants interrupts disabled! 3. Binary rewriting: . Can’t cause a trap on a (privileged) POPF . Protect kernel instruction pages, trap to VMM on first IFetch . Prevents correct functioning of the Guest OS . Scan page for POPF instructions and replace . Restart instruction in Guest OS and continue . Used by, e.g., VMware 4. Hardware support: Intel VT-x, AMD-V . Extra processor mode causes POPF to trap spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Virtualizing the MMU Virtual/Physical/Machine . Hypervisor allocates memory to VMs . Guest assumes control over all physical memory Guest Guest Machine . VMM can’t let Guest OS to install mappings Virtual AS Physical AS Memory . Definitions needed: . Virtual address: a virtual address in the guest 17 . Physical address: as seen by the guest Guest 1: . Machine address: real physical address 2 As seen by the Hypervisor 5 6 9 Guest 2: 5 spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth MMU virtualization Paravirtualization approach . Critical for performance, challenging to make fast, especially . Guest OS creates page tables the hardware uses SMP . VMM must validate all updates to page tables . Hot-unplug unnecessary virtual CPUs . Requires modifications to Guest OS . Use multicast TLB flush paravirtualizations etc. Not quite enough… . Xen supports 3 MMU virtualization modes . VMM must check all writes to PTEs 1. Direct (“Writable”) pagetables . Write-protect all PTEs to the Guest kernel 2. Shadow pagetables . Add a HyperCall to update PTEs 3. Hardware Assisted Paging . Batch updates to avoid trap overhead . OS Paravirtualization compulsory for #1, optional (and very . OS is now aware of machine addresses beneficial) for #2&3 . Significant overhead! spcl.inf.ethz.ch spcl.inf.ethz.ch @spcl_eth @spcl_eth Paravirtualizing the MMU Writeable Page Tables : 1 – Write fault . Guest OSes allocate and manage own PTs . Hypercall to change PT base guest reads . VMM must validate
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