On 10/14/2012 2:08 AM, Gleb Natapov wrote:
On Sat, Oct 13, 2012 at 10:32:13PM -0400, Sasha Levin wrote:
On 10/13/2012 06:29 PM, Chegu Vinod wrote:
Hello,
Wanted to get a clarification about KVM_MAX_VCPUS(currently set to 254)
in kvm_host.h file. The kvm_vcpu *vcpus array is sized based on KVM_MAX_VCPUS.
(i.e. a max of 254 elements in the array).
An 8bit APIC id should allow for 256 ID's. Reserving one for Broadcast should
leave 255 ID's. Is there one more ID reserved for some other purpose ? (hence
leading to KVM_MAX_VCPUS being set to 254 and not 255).
Another ID goes to the IO-APIC.
This is not really needed on KVM. We can enlarge KVM_MAX_VCPUS to 255.
Thanks for clarification! ( We did suspect the IO-APIC...but weren't
quite sure).
Vinod
--
Gleb.
.
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