linux-kernel - Re: [PATCH v2 2/2] xen/pvh: correctly setup the PV EFI interface for dom0

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Date:   Wed, 24 Apr 2019 17:45:04 +0200
From:   Roger Pau Monné <roger.pau@...rix.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
CC:     <linux-kernel@...r.kernel.org>, Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
        <xen-devel@...ts.xenproject.org>,
        <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] xen/pvh: correctly setup the PV EFI interface for
 dom0

On Wed, Apr 24, 2019 at 11:36:41AM -0400, Boris Ostrovsky wrote:
> On 4/23/19 9:04 AM, Roger Pau Monne wrote:
> > This involves initializing the boot params EFI related fields and the
> > efi global variable.
> >
> > Without this fix a PVH dom0 doesn't detect when booted from EFI, and
> > thus doesn't support accessing any of the EFI related data.
> >
> > Reported-by: PGNet Dev <pgnet.dev@...il.com>
> > Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
> 
> Hmm.. This seems to be breaking save/restore for me (for domU), and I
> can't see any obvious reasons.
> 
> Can you try it?

Sure, thanks for the extra testing! I have to admit I haven't tested
save/restore with this patch applied, it didn't come to mind it might
affect that functionality.

I assume it's save/restore of a PVH domU that's broken (HVM and PV are
fine)?

Thanks, Roger.