KVM: Introduce a 'mmap' method for KVM devices (a1cd3f08) · Commits · 戴 / test

Some KVM devices will want to handle special mappings related to the underlying HW. For instance, the XIVE interrupt controller of the POWER9 processor has MMIO pages for thread interrupt management and for interrupt source control that need to be exposed to the guest when the OS has the required support. Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:

Cédric Le Goater <clg@kaod.org> Reviewed-by:

David Gibson <david@gibson.dropbear.id.au> Signed-off-by:

Paul Mackerras <paulus@ozlabs.org>

include/linux/kvm_host.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -1245,6 +1245,7 @@ struct kvm_device_ops {
		int (has_attr)(struct kvm_device dev, struct kvm_device_attr *attr);
		long (ioctl)(struct kvm_device dev, unsigned int ioctl,
		unsigned long arg);
		int (mmap)(struct kvm_device dev, struct vm_area_struct *vma);
		};

		void kvm_device_get(struct kvm_device *dev);

virt/kvm/kvm_main.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -2884,6 +2884,16 @@ out:
		}
		#endif

		static int kvm_device_mmap(struct file filp, struct vm_area_struct vma)
		{
		struct kvm_device *dev = filp->private_data;

		if (dev->ops->mmap)
		return dev->ops->mmap(dev, vma);

		return -ENODEV;
		}

		static int kvm_device_ioctl_attr(struct kvm_device *dev,
		int (accessor)(struct kvm_device dev,
		struct kvm_device_attr *attr),
		@@ -2936,6 +2946,7 @@ static const struct file_operations kvm_device_fops = {
		.unlocked_ioctl = kvm_device_ioctl,
		.release = kvm_device_release,
		KVM_COMPAT(kvm_device_ioctl),
		.mmap = kvm_device_mmap,
		};

		struct kvm_device kvm_device_from_filp(struct file filp)

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