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Subject: Re: [PATCH v2 0/9] xen/x86: PVH Dom0 fixes and fallout adjustments
To:     Jan Beulich <jbeulich@suse.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc:     Stefano Stabellini <sstabellini@kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com>,
        "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
References: <9a26d4ff-80a1-e0c1-f528-31a8568d41f7@suse.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <e3f4db18-fe1b-ef73-84d6-a3351d83f8f3@suse.com>
Date:   Tue, 5 Oct 2021 08:38:53 +0200
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From: Juergen Gross <jgross@suse.com>
To: Jan Beulich <jbeulich@suse.com>,
 Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
 lkml <linux-kernel@vger.kernel.org>, =?UTF-8?Q?Roger_Pau_Monn=c3=a9?=
 <roger.pau@citrix.com>,
 "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Message-ID: <e3f4db18-fe1b-ef73-84d6-a3351d83f8f3@suse.com>
Subject: Re: [PATCH v2 0/9] xen/x86: PVH Dom0 fixes and fallout adjustments
References: <9a26d4ff-80a1-e0c1-f528-31a8568d41f7@suse.com>
In-Reply-To: <9a26d4ff-80a1-e0c1-f528-31a8568d41f7@suse.com>

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On 30.09.21 14:12, Jan Beulich wrote:
> In order to try to debug hypervisor side breakage from XSA-378 I found
> myself urged to finally give PVH Dom0 a try. Sadly things didn't work
> quite as expected. In the course of investigating these issues I actual=
ly
> spotted one piece of PV Dom0 breakage as well, a fix for which is also
> included here.
>=20
> There are one immediate remaining issues: Dom0, unlike in the PV case,
> cannot access the screen (to use as a console) when in a non-default
> mode (i.e. not 80x25 text), as the necessary information (in particular=

> about VESA-bases LFB modes) is not communicated. On the hypervisor side=

> this looks like deliberate behavior, but it is unclear to me what the
> intentions were towards an alternative model. (X may be able to access
> the screen depending on whether it has a suitable driver besides the
> presently unusable /dev/fb<N> based one.)
>=20
> v2 merely addresses small review comments in patches 7 and 9 (see there=
).
>=20
> 1: xen/x86: prevent PVH type from getting clobbered
> 2: xen/x86: allow PVH Dom0 without XEN_PV=3Dy
> 3: xen/x86: make "earlyprintk=3Dxen" work better for PVH Dom0
> 4: xen/x86: allow "earlyprintk=3Dxen" to work for PV Dom0
> 5: xen/x86: make "earlyprintk=3Dxen" work for HVM/PVH DomU
> 6: xen/x86: generalize preferred console model from PV to PVH Dom0
> 7: xen/x86: hook up xen_banner() also for PVH
> 8: x86/PVH: adjust function/data placement
> 9: xen/x86: adjust data placement

Series pushed to xen/tip.git for-linus-5.15b


Juergen


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