linux-kernel - Re: [PATCH 4/6] xen/pvh: bootup and setup related changes.

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Date:	Tue, 23 Oct 2012 16:47:29 -0700
From:	Mukesh Rathor <mukesh.rathor@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: Re: [PATCH 4/6] xen/pvh: bootup and setup related changes.

On Tue, 23 Oct 2012 14:07:06 +0100
Stefano Stabellini <stefano.stabellini@...citrix.com> wrote:

> On Mon, 22 Oct 2012, Konrad Rzeszutek Wilk wrote:
> > On Mon, Oct 22, 2012 at 02:34:44PM +0100, Stefano Stabellini wrote:
> > > On Sat, 20 Oct 2012, Konrad Rzeszutek Wilk wrote:
> > > > From: Mukesh Rathor <mukesh.rathor@...cle.com>
> > > > 
> > > >  	for (pfn = PFN_DOWN(start); pfn < xen_max_p2m_pfn;
> > > > pfn++) { unsigned long mfn = pfn_to_mfn(pfn);
> > > > @@ -100,6 +104,7 @@ static unsigned long __init
> > > > xen_do_chunk(unsigned long start, .domid        = DOMID_SELF
> > > >  	};
> > > >  	unsigned long len = 0;
> > > > +	int xlated_phys =
> > > > xen_feature(XENFEAT_auto_translated_physmap); unsigned long pfn;
> > > >  	int ret;
> > > >  
> > > > @@ -113,7 +118,7 @@ static unsigned long __init
> > > > xen_do_chunk(unsigned long start, continue;
> > > >  			frame = mfn;
> > > >  		} else {
> > > > -			if (mfn != INVALID_P2M_ENTRY)
> > > > +			if (!xlated_phys && mfn !=
> > > > INVALID_P2M_ENTRY) continue;
> > > >  			frame = pfn;
> > > >  		}
> > > 
> > > Shouldn't we add a "!xlated_phys &&" to the other case as well?
> > 
> > No. That is handled in xen_pvh_identity_map_chunk which
> > just does a xen_set_clr_mmio_pvh_pte call for the "released"
> > pages. But that is a bit of ... well, extra logic. I think
> > if we did this it would work and look much nicer:
> 
> Yes, I think that this version looks better

But doesn't boot:

(XEN) vmx_hybrid.c:710:d0 Dom:0 EPT violation 0x181 (r--/---), gpa 0x000000bf421e1c, mfn 0xffffffffffffffff, type 4.
(XEN) p2m-ept.c:642:d0 Walking EPT tables for domain 0 gfn bf421
(XEN) p2m-ept.c:648:d0  gfn exceeds max_mapped_pfn 4b062
(XEN) vmx_hybrid.c:717:d0  --- GLA 0xffffffffff477e1c


I'll have to debug it, or we can go back to the prev version, which
I don't think is that un-pretty :).

Mukesh


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