Delta with Xen on the Linux kernel Whats up with all that delta? - - PowerPoint PPT Presentation

Delta with Xen

• n the Linux kernel

What’s up with all that delta?

@mcgrof mcgrof@suse.com Luis R. Rodriguez http://www.do-not-panic.com

Slides: CC BY-SA Luis R. Rodriguez | Image: CC BY-SA Torkild Retvedt

How big is it?

Citrix: reset two years ago, mostly backports Debian: 4 microcode patches SUSE: the largest delta

SLE10: 133 patches SLE11: 185 patches SLE12: 110 patches 359,913 lines of code git://gitorious.org/opensuse/kernel-source.git patches.xen/

Image: CC BY-NC-SA ecololo

Addressing the delta

The xen wiki delta for Linux upstream tracker Luis Rodriguez: IPv6 autoconf, netback Juergen Gross: pvSCSI, PAT, 500GiB RAM Daniel Kiper: EFI Konrad Wilk: user mode pvlock Boris Ostrovsky: oprofile support

• Attitude adjustment: work upstream first (™) Is it possible? Future

development always upstream

• Backport automatically

Image: CC BY-SA Teza Harinaivo Ramiandrisoa

Needs verification

pci-guestdev mem-hotplug hypercall preemption - patch posted, did it go in? multipage ring

Image: CC BY-NC Sergiu Bacioiu

Needs work

• pvusb
• Expose ballooning limits
• Retaining tasklet in netback
• Add BLKIF_OP_PACKET, CDROM

command forwarding

• CDROM removable media attribute
• CDROM avoid takeover in HVM
• DCDBAS address translation
• Netback multicall for notifications
• Interrupt trigger mode and polarity
• Logarithmic scale for ballooning
• netfront support skb coalescing
• microcode update
• MTRR support
• Remove VM_IO vestiges
• Device hotplug (MODULE_ALIAS)
• Suspend event channel support for

faster checkpointing in Remus FT

• Expected to be dead code (under

xen) cannot easily be verified to be dead

• Support for old hypervisor (pvops

kernel on xen pre-4.0.1 hypervisor)

• blktap driver (what about blktap3?)

Image: CC-BY m4tik