XS Japan 2008 IA64 Status English

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The Linux Foundation

Isaku Yamahata: Paravirt_ops/IA64 Status Update

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paravirt_ops/IA64 status update

Isaku Yamahata <yamahata@valinux.co.jp>
VA Linux Systems Japan K.K.

Current status and future plan
Items status
minimal domU pv_ops done(2.6.27)
done(2.6.28)
Xen/domU
domU 2nd Phase more .S paravirtualization patch posted
save/restore patch posted
binary patch now coding
balloon expantion
free unused pages
skip to dom0(?)
irq balance
spin lock
dom0 ioremap
pci device scanning
DMA API
investigation needed
kexec/kdump
catch up the x86 work
PMU/PMD/PMC(xenoprof)
mca
and more?

done
work in progress
not started yet

nd
DomU 2 phase: more optimization
More .S paravirtualization
●

Implemented and posted. Now under review.
–

Binary patching
●

W.I.P.
–

Calling convention would be moot.
–

Non-banked static registers(current xen-like)
●

try this first.
–

Banked Static registers(PAL-like)
●

Stacked registers(C function call-like)
●

The basic framework code will be reused from
–
the previous experimental patches.

nd
DomU 2 phase: more functionality
save/restore:
●

Implemented and posted. Now under review.
–

Balloon expansion: wait for the x86
●

implementation and skip to dom0.
There is a race between balloon expansion and
–
live migration.
Probably The log dirty mode interface needs to be
●

revised.
Modifications to not only xenKernel, but also
–
tools stack are necessary.
X86 hasn't fully implemented it yet, too.
–

Currently only the kernel part.
●

nd
DomU 2 phase: more
functionality(cont.)
Skip to dom0: The followings are not
●

critical.
Freeing unused page
–

Only severl hundreds K bytes wastage.
●

Irq balance
–

Work around to disable irqbalanced.
●

Spin lock
–

Ticket spin lock does harm?
●

Is there anyone to complain?
●

Anyway this can be addressed independently.
●

Dom0 support
Catching up the x86 work
●

Wait for stabilizing x86 dom0 work
–

Event channel has been heavily cleaned up.
–

portability work again
●

First catch up the xen common code addition.
–

Backend drivers
●

privcmd
●

Dom0 support(cont.)
Needs investigation at first.
●

ioremap()
●

PCI device scanning
●

DMA API
●

The ia64 implementation was changed for VT-d
–
support
Share codes with x86?
–

kexec/kdump
●

How to coexist ia64 machine vector?
●

Thank you
http://wiki.xensource.com/xenwiki/XenIA64/
●

UpstreamMerge

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