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arm64: KVM: Add Kconfig option for max VCPUs per-Guest

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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>
This commit is contained in:
Anup Patel 2013-12-12 16:12:22 +00:00 committed by Marc Zyngier
parent dc1ccc4815
commit da7814700a
2 changed files with 17 additions and 1 deletions
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7
arch/arm64/include/asm/kvm_host.h
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@ -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

11
arch/arm64/kvm/Kconfig
View File

@ -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