[PATCH] arm64: KVM: Add Kconfig option for max VCPUs per-Guest
Anup Patel
anup.patel at linaro.org
Sat Sep 14 06:54:41 EDT 2013
Current max VCPUs per-Guest is set to 4 which is preventing
us from creating a Guest (or VM) with 8 VCPUs on Host (e.g.
X-Gene Storm SOC) with 8 Host CPUs.
The correct value of max VCPUs per-Guest should be same as
the max CPUs supported by GICv2 which is 8 but, increasing
value of max VCPUs per-Guest can make things slower hence
we add Kconfig option to let KVM users select appropriate
max VCPUs per-Guest.
Signed-off-by: Anup Patel <anup.patel at linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar at linaro.org>
---
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 0859a4d..f318c43 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_ARM_MAX_VCPUS)
+#define KVM_MAX_VCPUS CONFIG_KVM_ARM_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 21e9082..0c99deb 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_ARM_MAX_VCPUS
+ int "Number maximum supported virtual CPUs per VM"
+ depends on KVM_ARM_HOST
+ default 4
+ help
+ Static number of max supported virtual CPUs per VM.
+
+ If you choose a high number, the vcpu structures will be quite
+ large, so only choose a reasonable number that you expect to
+ actually use.
+
config KVM_ARM_VGIC
bool
depends on KVM_ARM_HOST && OF
--
1.7.9.5
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