[PATCH 13/15] arm64: KVM: Add Kconfig option for max VCPUs per-Guest
From: Marc Zyngier <hidden>
Date: 2013-12-28 11:15:45
Also in:
kvm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Anup Patel <redacted> 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 <redacted> Signed-off-by: Pranavkumar Sawargaonkar <redacted> Signed-off-by: Marc Zyngier <redacted> --- 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 5d85a02..0a1d697 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 4480ab3..8ba85e9 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig@@ -36,6 +36,17 @@ 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
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1.8.5.1