[PATCH 37/40] KVM: Add API to retrieve the number of supported vcpus per vm

From: Avi Kivity <avi@xxxxxxxxxxxx>
Date: Mon, 31 Mar 2008 17:37:21 +0300

Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 3 +++
include/linux/kvm.h | 1 +
2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 256c0fc..955d2ee 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -811,6 +811,9 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_VAPIC:
r = !kvm_x86_ops->cpu_has_accelerated_tpr();
break;
+ case KVM_CAP_NR_VCPUS:
+ r = KVM_MAX_VCPUS;
+ break;
default:
r = 0;
break;
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 94540b3..deb9c38 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -234,6 +234,7 @@ struct kvm_vapic_addr {
#define KVM_CAP_VAPIC 6
#define KVM_CAP_EXT_CPUID 7
#define KVM_CAP_CLOCKSOURCE 8
+#define KVM_CAP_NR_VCPUS 9 /* returns max vcpus per vm */

/*
* ioctls for VM fds
--
1.5.4.5

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References:
- [PATCH 00/40] KVM updates for the 2.6.26 merge window (part I)
  - From: Avi Kivity

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