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KVM: arm/arm64: vgic-new: vgic_init: implement vgic_create 

This patch implements the vgic_creation function which is
called on CREATE_IRQCHIP VM IOCTL (v2 only) or KVM_CREATE_DEVICE

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2015-12-21 14:50:50 +01:00 committed by Christoffer Dall
parent 9097773245
commit 5e6431da8f
2 changed files with 85 additions and 0 deletions
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1
include/kvm/vgic/vgic.h
View File

@ -195,6 +195,7 @@ struct vgic_cpu {
};
int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
int kvm_vgic_create(struct kvm *kvm, u32 type);
int kvm_vgic_hyp_init(void);
int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,

84
virt/kvm/arm/vgic/vgic-init.c
View File

@ -22,6 +22,90 @@
#include <asm/kvm_mmu.h>
#include "vgic.h"
/* CREATION */
/**
* kvm_vgic_create: triggered by the instantiation of the VGIC device by
* user space, either through the legacy KVM_CREATE_IRQCHIP ioctl (v2 only)
* or through the generic KVM_CREATE_DEVICE API ioctl.
* irqchip_in_kernel() tells you if this function succeeded or not.
*/
int kvm_vgic_create(struct kvm *kvm, u32 type)
{
int i, vcpu_lock_idx = -1, ret;
struct kvm_vcpu *vcpu;
mutex_lock(&kvm->lock);
if (irqchip_in_kernel(kvm)) {
ret = -EEXIST;
goto out;
}
/*
* This function is also called by the KVM_CREATE_IRQCHIP handler,
* which had no chance yet to check the availability of the GICv2
* emulation. So check this here again. KVM_CREATE_DEVICE does
* the proper checks already.
*/
if (type == KVM_DEV_TYPE_ARM_VGIC_V2 &&
!kvm_vgic_global_state.can_emulate_gicv2) {
ret = -ENODEV;
goto out;
}
/*
* Any time a vcpu is run, vcpu_load is called which tries to grab the
* vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure
* that no other VCPUs are run while we create the vgic.
*/
ret = -EBUSY;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!mutex_trylock(&vcpu->mutex))
goto out_unlock;
vcpu_lock_idx = i;
}
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.has_run_once)
goto out_unlock;
}
ret = 0;
if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
else
kvm->arch.max_vcpus = VGIC_V3_MAX_CPUS;
if (atomic_read(&kvm->online_vcpus) > kvm->arch.max_vcpus) {
ret = -E2BIG;
goto out_unlock;
}
kvm->arch.vgic.in_kernel = true;
kvm->arch.vgic.vgic_model = type;
/*
* kvm_vgic_global_state.vctrl_base is set on vgic probe (kvm_arch_init)
* it is stored in distributor struct for asm save/restore purpose
*/
kvm->arch.vgic.vctrl_base = kvm_vgic_global_state.vctrl_base;
kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
kvm->arch.vgic.vgic_redist_base = VGIC_ADDR_UNDEF;
out_unlock:
for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
mutex_unlock(&vcpu->mutex);
}
out:
mutex_unlock(&kvm->lock);
return ret;
}
/* GENERIC PROBE */
static void vgic_init_maintenance_interrupt(void *info)