RE: [Xen-devel] A domain id 0x00007fff in the result of xentrace

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> Hi,
> 
> When I used xentrace to get all domain events, I found that the xen
> scheduler periodically scheduled a domain with id 0x00007fff. However,
> that domain didn't issue any hypercall or exception. Because I didn't
> create any domain only the default dom0, I supposed I could only see
dom0.
> Does anyone know what that domain is? I search the id "0x00007fff" in
all
> xen source files but didn't find any result. Any information is
> appreciated. Thanks in advance.
> 

A quick grep for 0x7fff in the sources for the hypervisor says:

#define IDLE_DOMAIN_ID   (0x7FFFU)
#define is_idle_domain(d) ((d)->domain_id == IDLE_DOMAIN_ID)
#define is_idle_vcpu(v)   (is_idle_domain((v)->domain))

Does this limit us to 32766 DomU's before we need a reboot to reset the
id count?

James

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