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| | [[Category:Virtualization]] <!-- do not copy into FWN issue --> |
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| {{Anchor|Virtualization}} | | {{Anchor|Virtualization}} |
| == Virtualization ==
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| In this section, we cover discussion on the @et-mgmnt-tools-list, @fedora-xen-list, @libvirt-list and @ovirt-devel-list of Fedora virtualization technologies.
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| Contributing Writer: [[DaleBewley | Dale Bewley]]
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| === Enterprise Management Tools List === | | == Virtualization == |
| This section contains the discussion happening on the [https://www.redhat.com/mailman/listinfo/et-mgmt-tools et-mgmt-tools list]
| | In this section, we cover discussion of Fedora virtualization technologies on the |
| | | @fedora-virt list. |
| === Fedora Xen List ===
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| This section contains the discussion happening on the [https://www.redhat.com/mailman/listinfo/fedora-xen fedora-xen list].
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| ==== Status of dom0 Support in Upstream Kernel ====
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| [[PasiKärkkäinen|Pasi Kärkkäinen]] forwarded[1] a message[2] from [[Jeremy Fitzhardinge|Jeremy Fitzhardinge]], originally to the @xen-devel list, describing the state of dom0 support in the upstream <code>kernel</code>.
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| ".28 was a bit optimistic; (FWN#137[3]) .29 seems reasonable. The current dom0 kernel
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| patches can boot up to a fully functional dom0 usersmode, and you can
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| start xend to see that domain 0 is running. I *think* in theory you can
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| create a deviceless domain, but I haven't tried it. I'm currently
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| working on <code>blktap</code> support.
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| I really need to put together a proper status update. Now that dom0
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| usermode is working, its a much better base for other people start
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| contributing."
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| [1] http://www.redhat.com/archives/fedora-xen/2008-November/msg00011.html
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| [2] http://lists.xensource.com/archives/html/xen-devel/2008-11/msg00205.html
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| [3] http://fedoraproject.org/wiki/FWN/Issue137#State_of_Xen_in_Upstream_Linux
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| Just two days later Jeremy posted[4] a large set of patches to @xen-devel with
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| the following explaination.
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| "A dom0 Xen domain is basically the same as a normal domU domain, but
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| it has extra privileges to directly access hardware. There are two
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| issues to deal with:
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| * translating to and from the domain's pseudo-physical addresses and real machine addresses (for ioremap and setting up DMA)
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| * routing hardware interrupts into the domain
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| ioremap is relatively easy to deal with. ..."
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| "... Interrupts are a very different affair. The descriptions in each
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| patch describe how it all fits together in detail, but the overview
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| is:
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| # Xen owns the local APICs; the dom0 kernel controls the IO APICs
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| # Hardware interrupts are delivered on event channels like everything else
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| # To set this up, we intercept at pcibios_enable_irq:
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| :* given a dev+pin, we use ACPI to get a gsi
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| :* hook acpi_register_gsi to call xen_register_gsi, which
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| :* allocates an irq (generally not 1:1 with the gsi)
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| :* asks Xen for a vector and event channel for the irq
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| :* program the IO APIC to deliver the hardware interrupt to the allocated vector
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| The upshot is that the device driver gets an irq, and when the
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| hardware raises an interrupt, it gets delivered on that irq.
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| We maintain our own irq allocation space, since the hardware-bound
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| event channel irqs are intermixed with all the other normal Xen event
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| channel irqs (inter-domain, timers, IPIs, etc). For compatibility the
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| irqs 0-15 are reserved for legacy device interrupts, but the rest of
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| the range is dynamically allocated.
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| Initialization also requires care. The dom0 kernel parses the ACPI
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| tables as usual, in order to discover the local and IO APICs, and all
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| the rest of the ACPI-provided data the kernel requires. However,
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| because the kernel doesn't own the local APICs and can't directly map
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| the IO APICs, we must be sure to avoid actually touching the hardware
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| when running under Xen.
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| TODO: work out how to fit MSI[5] into all this.
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| '''So, in summary, this series contains:'''
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| * dom0 console support
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| * dom0 xenbus support
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| * CPU features and IO access for a privleged domain
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| * mtrrs
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| * making ioremap work on machine addresses
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| * swiotlb allocation hooks
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| * interrupts:
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| ** introduce PV io_apic operations
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| ** add Xen-specific IRQ allocator
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| ** switch to using all-Xen event delivery
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| ** add pirq Xen interrupt type
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| ** table parsing and setup
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| ** intercept driver interrupt registration
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| All this code will compile away to nothing when <code>CONFIG_XEN_DOM0</code> is not
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| enabled. If it is enabled, it will only have an effect if booted as a
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| dom0 kernel; normal native execution and domU execution should be
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| unaffected."
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| [4] http://lists.xensource.com/archives/html/xen-devel/2008-11/msg00268.html
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| [5] http://lwn.net/Articles/44139/
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| === Libvirt List ===
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| This section contains the discussion happening on the [http://www.redhat.com/mailman/listinfo/libvir-list libvir-list].
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| ==== OpenVZ Bridge Support Committed ====
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| [[DanielBerrange|Daniel P. Berrange]] updated[1] a previous patch[2] designed
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| to "enable bridge support in the <code>OpenVZ</code> driver. As well as the fixes
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| suggested last time, it includes an initial bit of HTML doc for the
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| <code>OpenVZ</code> driver, covering example XML, and the bridge configuration
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| requirements."
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| [1] http://www.redhat.com/archives/libvir-list/2008-November/msg00117.html
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| [2] http://www.redhat.com/archives/libvir-list/2008-October/msg00326.html
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| ==== Qemu/KVM Live Migration Implemented ====
| | Contributing Writer: [[User:Dale | Dale Bewley]] |
| [[ChrisLalancette|Chris Lalancette]] posted[1] the patch to implement Qemu/KVM live migration. After a little upstream cleanup[2], the patch was committed. | |
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| "Now that upstream Qemu has settled on an interface that is friendly to libvirt (i.e.
| | === Fedora Virtualization List === |
| one that doesn't block the monitor on -incoming), we can implement it here.
| | This section contains the discussion happening on the |
| Note that the bulk of this patch was written by Rich Jones quite a while ago.
| | [http://www.redhat.com/mailman/listinfo/fedora-virt fedora-virt list]. |
| My hand in it has mostly been to forward port it to current libvirt CVS, tweak
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| it for the new Qemu style, and test it out with a recent KVM (kvm-78, in
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| particular)."
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| [1] http://www.redhat.com/archives/libvir-list/2008-November/msg00087.html | | ==== Virt Status Report ==== |
| | [[JustinForbes|Justin Forbes]] |
| | posted<ref>http://www.redhat.com/archives/fedora-virt/2009-December/msg00056.html</ref> a Fedora virtualization status report. |
| | Justin pointed out F13 bugs<ref>http://fedoraproject.org/wiki/Virtualization_bugs</ref> now include Important and Pony classifications in addition to Blocker and Target. |
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| [2] http://www.redhat.com/archives/libvir-list/2008-November/msg00092.html
| | <references /> |
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| ==== Fix Logical Volume Scanning of Encrypted Volumes ==== | | ==== RHEL and Fedora Virtualization Feature Parity ==== |
| [[ColeRobinson|Cole Robinson]] fixed[1] a bug[2] that prevented logical volume
| | Robert Day wondered how the virtualization features<ref>http://www.redhat.com/virtualization/rhev/</ref> of Red Hat Enterprise Linux 5.4 |
| scanning of an encrypted volume in a storage pool[3].
| | compared to Fedora 12. |
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| [1] http://www.redhat.com/archives/libvir-list/2008-November/msg00138.html | | [[DanielBerrange|Daniel Berrange]] |
| | explained<ref>http://www.redhat.com/archives/fedora-virt/2009-December/msg00040.html</ref> |
| | "The KVM based virtualization in RHEL-5.4 is not nearly so far behind |
| | Fedora as you might think. The {{package|libvirt}} mgmt stack in RHEL-5.4 was |
| | rebased to be near parity with [[Releases/11|Fedora 11]], and KVM in RHEL-5.4 is |
| | also pretty close to that using what's best described as a hybrid of |
| | kvm-83 and kvm-84." |
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| [2] http://bugzilla.redhat.com/show_bug.cgi?id=470693
| | <references /> |
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| [3] http://www.libvirt.org/archstorage.html
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| ==== Domain Events Enhancements ==== | | ==== ==== |
| | <references /> |
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| === oVirt Devel List === | | ==== ==== |
| This section contains the discussion happening on the [https://www.redhat.com/mailman/listinfo/ovirt-devel ovirt-devel list].
| | <references /> |
libvirt