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| author | Anup Patel <anup.patel@linaro.org> | 2013-12-12 16:12:22 +0000 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-04-16 21:36:43 +0900 |
| commit | 3029af4abd81a6903c23a5acfb0e6000f50d18d8 (patch) | |
| tree | 01c6ca00686864545604d2b17c70413ef1e55a24 | |
| parent | c3dd7f04b485d86634726d1bb4435b45c84adb75 (diff) | |
| download | linux-3.10-3029af4abd81a6903c23a5acfb0e6000f50d18d8.tar.gz linux-3.10-3029af4abd81a6903c23a5acfb0e6000f50d18d8.tar.bz2 linux-3.10-3029af4abd81a6903c23a5acfb0e6000f50d18d8.zip | |
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>
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 7 | ||||
| -rw-r--r-- | arch/arm64/kvm/Kconfig | 11 |
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 5d85a02d123..0a1d6975156 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 4480ab339a0..8ba85e9ea38 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 |