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KVM: x86: Increase the "hard" max VCPU limit

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KVM guests today use 8bit APIC ids allowing for 256 ID's. Reserving one
ID for Broadcast interrupts should leave 255 ID's. In case of KVM there
is no need for reserving another ID for IO-APIC so the hard max limit for
VCPUS can be increased from 254 to 255. (This was confirmed by Gleb Natapov
http://article.gmane.org/gmane.comp.emulators.kvm.devel/99713  )

Signed-off-by: Chegu Vinod <chegu_vinod@hp.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Chegu Vinod 2013-04-27 18:31:04 -07:00 committed by Gleb Natapov
parent 2a5bab1004
commit cbf6435858
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/kvm_host.h
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@ -31,7 +31,7 @@
#include <asm/msr-index.h>
#include <asm/asm.h>
#define KVM_MAX_VCPUS 254
#define KVM_MAX_VCPUS 255
#define KVM_SOFT_MAX_VCPUS 160
#define KVM_USER_MEM_SLOTS 125
/* memory slots that are not exposed to userspace */