linux.git/drivers/xen/cpu_hotplug.c, branch v2.6.31 Linux kernel source tree xen: honour VCPU availability on boot 2009-04-08T21:25:51+00:00 Ian Campbell Ian.Campbell@citrix.com 2009-04-02T12:24:28+00:00 d745562cc40bff60f0597004d8128fa0225cc267 If a VM is booted with offline VCPUs then unplug them during boot. Determining the availability of a VCPU requires access to XenStore which is not available at the point smp_prepare_cpus() is called, therefore we bring up all VCPUS initially and unplug the offline ones as soon as XenStore becomes available. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> 
If a VM is booted with offline VCPUs then unplug them during boot. Determining
the availability of a VCPU requires access to XenStore which is not available
at the point smp_prepare_cpus() is called, therefore we bring up all VCPUS
initially and unplug the offline ones as soon as XenStore becomes available.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
cpumask: make Xen use the new operators. 2009-03-13T04:19:56+00:00 Rusty Russell rusty@rustcorp.com.au 2009-03-13T04:19:56+00:00 d680eb8bcd0e43b20067fd2c810d76463db5444e Impact: cleanup In particular, *map are deprecated, and you have to use the accessors as *mask are const. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> To: Jeremy Fitzhardinge <jeremy@xensource.com> 
Impact: cleanup

In particular, *map are deprecated, and you have to use the accessors
as *mask are const.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
To: Jeremy Fitzhardinge <jeremy@xensource.com>
x86, um: ... and asm-x86 move 2008-10-23T05:55:20+00:00 Al Viro viro@zeniv.linux.org.uk 2008-08-18T01:05:42+00:00 bb8985586b7a906e116db835c64773b7a7d51663 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Xen: fix cpu_hotplug.c build by replacing is_running_on_xen() with xen_pv_domain() 2008-09-05T15:44:07+00:00 Alex Nixon alex.nixon@citrix.com 2008-09-03T13:30:21+00:00 5c51c637e489f3f4d58d51365b0c558549918858 Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> 
Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
xen: implement CPU hotplugging 2008-08-25T09:25:14+00:00 Alex Nixon alex.nixon@citrix.com 2008-08-22T10:52:15+00:00 d68d82afd4c88e25763b23cd9cd4974573a3706f Note the changes from 2.6.18-xen CPU hotplugging: A vcpu_down request from the remote admin via Xenbus both hotunplugs the CPU, and disables it by removing it from the cpu_present map, and removing its entry in /sys. A vcpu_up request from the remote admin only re-enables the CPU, and does not immediately bring the CPU up. A udev event is emitted, which can be caught by the user if he wishes to automatically re-up CPUs when available, or implement a more complex policy. Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> 
Note the changes from 2.6.18-xen CPU hotplugging:

A vcpu_down request from the remote admin via Xenbus both hotunplugs the
CPU, and disables it by removing it from the cpu_present map, and removing
its entry in /sys.

A vcpu_up request from the remote admin only re-enables the CPU, and does
not immediately bring the CPU up. A udev event is emitted, which can be
caught by the user if he wishes to automatically re-up CPUs when available,
or implement a more complex policy.

Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>