linux-kernel - Re: [PATCH 1/2] kvm: Remove ability to assign a device without iommu support

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Date:	Tue, 20 Dec 2011 10:49:19 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	avi@...hat.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com
Subject: Re: [PATCH 1/2] kvm: Remove ability to assign a device without
 iommu support

On Mon, 2011-12-19 at 20:19 -0700, Alex Williamson wrote:
> This option has no users and it exposes a security hole that we
> can allow devices to be assigned without iommu protection.  Make
> KVM_DEV_ASSIGN_ENABLE_IOMMU a mandatory option.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> ---
> 
>  virt/kvm/assigned-dev.c |   18 +++++++++---------
>  1 files changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
> index 3ad0925..a251a28 100644
> --- a/virt/kvm/assigned-dev.c
> +++ b/virt/kvm/assigned-dev.c
> @@ -487,6 +487,9 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
>  	struct kvm_assigned_dev_kernel *match;
>  	struct pci_dev *dev;
>  
> +	if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
> +		return -EINVAL;

Could we just drop KVM_DEV_ASSIGN_ENABLE_IOMMU and do it by default?
calling KVM_ASSIGN_PCI_DEVICE without that flag set it pretty
meaningless.

-- 

Sasha.

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