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authorAnup Patel <anup.patel@linaro.org>2013-12-12 16:12:22 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2013-12-28 10:28:50 +0000
commitda7814700a0c408bead58ce4714b7625ffbaade1 (patch)
tree19919bfdc4206bd9f1a33f30fbb4eb034eed6cdb /arch/arm64
parentdc1ccc48159d63eca5089e507c82c7d22ef60839 (diff)
downloadlinux-da7814700a0c408bead58ce4714b7625ffbaade1.tar.bz2
arm64: KVM: Add Kconfig option for max VCPUs per-Guest
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@linaro.org> Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/include/asm/kvm_host.h7
-rw-r--r--arch/arm64/kvm/Kconfig11
2 files changed, 17 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 5d85a02d1231..0a1d69751562 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 4480ab339a00..8ba85e9ea388 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