linux-kernel - [PATCH 3/3] aarch64: kvm: introduce CONFIG_KVM_MAX

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Date:	Sat, 14 Sep 2013 14:10:56 +0200
From:	Andrew Jones <drjones@...hat.com>
To:	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org
Cc:	catalin.marinas@....com, christoffer.dall@...aro.org,
	gleb@...hat.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, marc.zyngier@....com,
	pbonzini@...hat.com, linux@....linux.org.uk, will.deacon@....com
Subject: [PATCH 3/3] aarch64: kvm: introduce CONFIG_KVM_MAX_VCPUS

Take CONFIG_KVM_MAX_VCPUS from arm32, but set the default to 8.

Signed-off-by: Andrew Jones <drjones@...hat.com>
---
 arch/arm64/include/asm/kvm_host.h |  7 ++++++-
 arch/arm64/kvm/Kconfig            | 11 +++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 0859a4ddd1e7d..d1af8c49a5ca4 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -26,7 +26,12 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_mmio.h>
 
-#define KVM_MAX_VCPUS 4
+#if defined(CONFIG_KVM_MAX_VCPUS)
+#define KVM_MAX_VCPUS CONFIG_KVM_MAX_VCPUS
+#else
+#define KVM_MAX_VCPUS 0
+#endif
+
 #define KVM_USER_MEM_SLOTS 32
 #define KVM_PRIVATE_MEM_SLOTS 4
 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 21e90820bd23c..c9924b02e84f7 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -35,6 +35,17 @@ config KVM_ARM_HOST
 	---help---
 	  Provides host support for ARM processors.
 
+config KVM_MAX_VCPUS
+	int "Number maximum supported virtual CPUs per VM"
+	depends on KVM_ARM_HOST
+	default 8
+	help
+	  Static number of max supported virtual CPUs per VM.
+
+	  The default is set to the highest number of vcpus that
+	  current hardware supports. Set to a lower number to save
+	  some resources. Set to a higher number to test scalability.
+
 config KVM_ARM_VGIC
 	bool
 	depends on KVM_ARM_HOST && OF
-- 
1.8.1.4

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