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From: John Levon <john.levon@nutanix.com>
To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: John Levon <john.levon@nutanix.com>,
	"libvfio-user-devel@nongnu.org" <libvfio-user-devel@nongnu.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Cornelia Huck <cohuck@redhat.com>,
	"john.g.johnson@oracle.com" <john.g.johnson@oracle.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [DRAFT RFC] ioeventfd/ioregionfd support in vfio-user
Date: Thu, 28 Jan 2021 14:38:08 +0000	[thread overview]
Message-ID: <20210128143805.GA95453@sent> (raw)
In-Reply-To: <20210126110104.GA250425@stefanha-x1.localdomain>

On Tue, Jan 26, 2021 at 11:01:04AM +0000, Stefan Hajnoczi wrote:

> > 4) (ioregionfd issue) region_id is 4 bytes, which seems a little awkward from
> > the server side: this has to encode both the region ID as well as the offset of
> > the sub-region within that region. Can this be 64 bits wide?
> 
> The user_data field in Elena's ioregionfd patches is 64 bits. Does this
> solve the problem?

I had missed this had been changed from the proposal at https://www.spinics.net/lists/kvm/msg208139.html

Thanks for pointing this out.

regards
john

WARNING: multiple messages have this Message-ID (diff)
From: John Levon <john.levon@nutanix.com>
To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: "john.g.johnson@oracle.com" <john.g.johnson@oracle.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	John Levon <john.levon@nutanix.com>,
	Cornelia Huck <cohuck@redhat.com>,
	"libvfio-user-devel@nongnu.org" <libvfio-user-devel@nongnu.org>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [DRAFT RFC] ioeventfd/ioregionfd support in vfio-user
Date: Thu, 28 Jan 2021 14:38:08 +0000	[thread overview]
Message-ID: <20210128143805.GA95453@sent> (raw)
In-Reply-To: <20210126110104.GA250425@stefanha-x1.localdomain>

On Tue, Jan 26, 2021 at 11:01:04AM +0000, Stefan Hajnoczi wrote:

> > 4) (ioregionfd issue) region_id is 4 bytes, which seems a little awkward from
> > the server side: this has to encode both the region ID as well as the offset of
> > the sub-region within that region. Can this be 64 bits wide?
> 
> The user_data field in Elena's ioregionfd patches is 64 bits. Does this
> solve the problem?

I had missed this had been changed from the proposal at https://www.spinics.net/lists/kvm/msg208139.html

Thanks for pointing this out.

regards
john

  reply	other threads:[~2021-01-28 15:02 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 16:09 [DRAFT RFC] ioeventfd/ioregionfd support in vfio-user John Levon
2021-01-26 11:01 ` Stefan Hajnoczi
2021-01-26 11:01   ` Stefan Hajnoczi
2021-01-28 14:38   ` John Levon [this message]
2021-01-28 14:38     ` John Levon

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