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

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Message-ID: <131ff20e-5f28-40ef-37a0-422f6508c115@oracle.com>
Date:   Wed, 24 Apr 2019 11:45:43 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Roger Pau Monné <roger.pau@...rix.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 4/24/19 11:45 AM, Roger Pau Monné wrote:
> 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)?
>


PV is fine, I haven't tried HVM.

-boris