diff options
Diffstat (limited to 'arch/arm64/kvm/vgic/vgic-kvm-device.c')
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic-kvm-device.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c index 00c011cc8627..8e24d550d9d2 100644 --- a/arch/arm64/kvm/vgic/vgic-kvm-device.c +++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c @@ -5,6 +5,7 @@ * Copyright (C) 2015 ARM Ltd. * Author: Marc Zyngier <marc.zyngier@arm.com> */ +#include <linux/irqchip/arm-gic-v3.h> #include <linux/kvm_host.h> #include <kvm/arm_vgic.h> #include <linux/uaccess.h> @@ -504,6 +505,23 @@ int vgic_v3_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr, } /* + * Allow access to certain ID-like registers prior to VGIC initialization, + * thereby allowing the VMM to provision the features / sizing of the VGIC. + */ +static bool reg_allowed_pre_init(struct kvm_device_attr *attr) +{ + if (attr->group != KVM_DEV_ARM_VGIC_GRP_DIST_REGS) + return false; + + switch (attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK) { + case GICD_IIDR: + return true; + default: + return false; + } +} + +/* * vgic_v3_attr_regs_access - allows user space to access VGIC v3 state * * @dev: kvm device handle @@ -552,7 +570,7 @@ static int vgic_v3_attr_regs_access(struct kvm_device *dev, mutex_lock(&dev->kvm->arch.config_lock); - if (!vgic_initialized(dev->kvm)) { + if (!(vgic_initialized(dev->kvm) || reg_allowed_pre_init(attr))) { ret = -EBUSY; goto out; } |