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| author | Andre Przywara <andre.przywara@arm.com> | 2014-06-02 16:26:01 +0200 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2015-01-20 18:25:28 +0100 |
| commit | 3caa2d8c3b2d80f5e342fe8cec07c03c8147dcab (patch) | |
| tree | a07f89b6bcbd96fa45a65b52591d5fda2490a2f4 /arch/arm | |
| parent | 4ce7ebdfc69d1d5d166eec103ed2976eb45a6173 (diff) | |
| download | op-kernel-dev-3caa2d8c3b2d80f5e342fe8cec07c03c8147dcab.zip op-kernel-dev-3caa2d8c3b2d80f5e342fe8cec07c03c8147dcab.tar.gz | |
arm/arm64: KVM: make the maximum number of vCPUs a per-VM value
Currently the maximum number of vCPUs supported is a global value
limited by the used GIC model. GICv3 will lift this limit, but we
still need to observe it for guests using GICv2.
So the maximum number of vCPUs is per-VM value, depending on the
GIC model the guest uses.
Store and check the value in struct kvm_arch, but keep it down to
8 for now.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/kvm_host.h | 1 | ||||
| -rw-r--r-- | arch/arm/kvm/arm.c | 8 |
2 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 2fa5174..bde4946 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -68,6 +68,7 @@ struct kvm_arch { /* Interrupt controller */ struct vgic_dist vgic; + int max_vcpus; }; #define KVM_NR_MEM_OBJS 40 diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 3a51ffca..6fbfa5f 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -132,6 +132,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) /* Mark the initial VMID generation invalid */ kvm->arch.vmid_gen = 0; + /* The maximum number of VCPUs is limited by the host's GIC model */ + kvm->arch.max_vcpus = kvm_vgic_get_max_vcpus(); + return ret; out_free_stage2_pgd: kvm_free_stage2_pgd(kvm); @@ -218,6 +221,11 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) goto out; } + if (id >= kvm->arch.max_vcpus) { + err = -EINVAL; + goto out; + } + vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); if (!vcpu) { err = -ENOMEM; |
