linux-kernel - Re: [PATCH v2 1/6] kvm: Pass kvm

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Message-ID: <20120628110316.0f53a1ef@BR9GNB5Z>
Date:	Thu, 28 Jun 2012 11:03:16 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Alex Williamson <alex.williamson@...hat.com>, avi@...hat.com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com
Subject: Re: [PATCH v2 1/6] kvm: Pass kvm_irqfd to functions

On Thu, 28 Jun 2012 11:38:57 +0300
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> On Wed, Jun 27, 2012 at 04:24:30PM +0200, Cornelia Huck wrote:
> > On Tue, 26 Jun 2012 23:09:04 -0600
> > Alex Williamson <alex.williamson@...hat.com> wrote:
> > 
> > > Prune this down to just the struct kvm_irqfd so we can avoid
> > > changing function definition for every flag or field we use.
> > > 
> > > Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> > 
> > I'm currently trying to find a way to make irqfd workable for s390
> > which will likely include using a new field in kvm_irqfd, so I'd like
> > to have this change (and I also think it makes the code nicer to read).
> > So:
> > 
> > Acked-by: Cornelia Huck <cornelia.huck@...ibm.com>
> 
> Unfortunately it looks like we are not sanitizing kvm_irqfd
> at all so we won't be able to use the padding :(
> We'll need a new ioctl instead.
> 

How about something like this as parameter for the new ioctl?

struct kvm_irqfd2 {
	__u32 fd;
	__u32 flags;  /* for things like deassign */
	__u64 type;   /* determines the payload */
	union {
		/* type traditional */
		struct {
			__u32 gsi;
		} trad;
		/* type s390 */
		struct {
			__u32 int_type;
			__u32 parm;
			__u64 parm64;
		} s390;
		__u8 pad[20];
	};
}

This could be combined with an arch or a per-kvm callback to keep the
generic code clean of architecture dependencies.

Cornelia

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