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authorChegu Vinod <chegu_vinod@hp.com>2013-04-27 18:31:04 -0700
committerGleb Natapov <gleb@redhat.com>2013-04-28 13:17:48 +0300
commitcbf64358588ae45dcf0207dbc97fba783577d64a (patch)
tree569dc33d28fe0f275847d1e5f1343bd045a27c31
parent2a5bab1004729f3302c776e53ee7c895b98bb1ce (diff)
KVM: x86: Increase the "hard" max VCPU limit
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>
-rw-r--r--arch/x86/include/asm/kvm_host.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 38f2cc0a5a23..ec14b7245a4e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -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 */