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From: Stefano Stabellini <sstabellini@kernel.org>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>,
	 "xen-devel@lists.xenproject.org"
	<xen-devel@lists.xenproject.org>,
	 Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: Support of old Xen versions in the Linux kernel
Date: Tue, 13 Apr 2021 16:32:52 -0700 (PDT)	[thread overview]
Message-ID: <alpine.DEB.2.21.2104131631470.4885@sstabellini-ThinkPad-T480s> (raw)
In-Reply-To: <b7684e00-8675-5768-b4b2-f9435620b34e@oracle.com>

On Tue, 13 Apr 2021, Boris Ostrovsky wrote:
> On 4/13/21 2:14 AM, Juergen Gross wrote:
> > In x86 kernel development the question came up whether we need to
> > support XENFEAT_gnttab_map_avail_bits not being set when running as a PV
> > guest.
> >
> > This feature is active for PV guests since Xen 3.4.
> >
> > So the basic question is: which is the oldest version of Xen we want to
> > support in the Linux kernel? As far as I know there is no Xen based
> > product in productive use with Xen older than 4.2.
> >
> > Would we be fine to drop support for older versions (feel free to
> > suggest other versions than 4.2 as the first to be supported Xen
> > version)?
> >
> > In case the answer is yes, I'd post some patches to clean up the kernel,
> > including a safety net to bail out in case a feature needed isn't
> > available.
> 
> Sounds good to me.

For ARM, the Xen ABI became stable only with Xen 4.4.


      reply	other threads:[~2021-04-13 23:33 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13  6:14 Support of old Xen versions in the Linux kernel Juergen Gross
2021-04-13 17:33 ` Boris Ostrovsky
2021-04-13 23:32   ` Stefano Stabellini [this message]

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