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Commit a1cd3f08 authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Paul Mackerras
Browse files

KVM: Introduce a 'mmap' method for KVM devices 



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: default avatarCédric Le Goater <clg@kaod.org>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent e4945b9d

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 @@ static long kvm_vcpu_compat_ioctl(struct file *filp, 
}

#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)