linux-kernel - Re: [PATCH] xen/x86: Adjust stack pointer in xen

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Message-ID: <564A4125.8000603@oracle.com>
Date:	Mon, 16 Nov 2015 15:48:37 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	xen-devel <xen-devel@...ts.xen.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH] xen/x86: Adjust stack pointer in xen_sysexit

On 11/16/2015 03:22 PM, Borislav Petkov wrote:
> On Mon, Nov 16, 2015 at 12:11:11PM -0800, Andy Lutomirski wrote:
>
>> Are there really multiple feature bits for this stuff?  I'd like to
>> imagine that the entry code is all either Xen PV or native/PVH/PVHVM
>> -- i.e. I assumed that PVH works like native for all entries.


Almost. For PVH we will have a small stub to set up bootparams and such 
but then we jump to startup_{32|64} code.


> I just reacted to Boris' statement:
>
> "We don't currently have a Xen-specific CPU feature. We could, in
> principle, add it but we can't replace all of current paravirt patching
> with a single feature since PVH guests use a subset of existing pv ops
> (and in the future it may become even more fine-grained)."

Actually, nevermind this --- I was thinking about APIC ops and they are 
not pv ops.

Note though that there are other users of pv ops --- lguest and looks 
like KVM (for one op) use them too.

-boris
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