linux-kernel - Re: [KVM PATCH v7 3/3] kvm: add iofd support

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Date:	Thu, 14 May 2009 14:11:18 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Gregory Haskins <ghaskins@...ell.com>
CC:	kvm@...r.kernel.org, viro@...IV.linux.org.uk,
	linux-kernel@...r.kernel.org, davidel@...ilserver.org
Subject: Re: [KVM PATCH v7 3/3] kvm: add iofd support

Gregory Haskins wrote:
> iofd is a mechanism to register PIO/MMIO regions to trigger an eventfd
> signal when written to.  Userspace can register any arbitrary address
> with a corresponding eventfd.
>
>   

Please start a separate patchset for this so I can merge irqfd.

>
> diff --git a/include/linux/kvm.h b/include/linux/kvm.h
> index dfc4bcc..99b6e45 100644
> --- a/include/linux/kvm.h
> +++ b/include/linux/kvm.h
> @@ -292,6 +292,17 @@ struct kvm_guest_debug {
>  	struct kvm_guest_debug_arch arch;
>  };
>  
> +#define KVM_IOFD_FLAG_DEASSIGN  (1 << 0)
> +#define KVM_IOFD_FLAG_PIO       (1 << 1)
> +
> +struct kvm_iofd {
> +	__u64 addr;
> +	__u32 len;
> +	__u32 fd;
> +	__u32 flags;
> +	__u8  pad[12];
> +};
> +
>   
Please add a data match capability.  virtio uses a write with the data 
containing the queue ID, and we want a separate event for each queue.


>   * kvm trace categories
> @@ -508,6 +519,7 @@ struct kvm_irqfd {
>  #define KVM_DEASSIGN_DEV_IRQ       _IOW(KVMIO, 0x75, struct kvm_assigned_irq)
>  #define KVM_ASSIGN_IRQFD           _IOW(KVMIO, 0x76, struct kvm_irqfd)
>  #define KVM_DEASSIGN_IRQFD         _IOW(KVMIO, 0x77, __u32)
> +#define KVM_IOFD                   _IOW(KVMIO, 0x78, struct kvm_iofd)
>   

Too general a name.  It's not doing IO, just sending out notifications.

Why have assign/deassign for irqfd and a single ioctl for iofd?

The rest looks good.

-- 
error compiling committee.c: too many arguments to function

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