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Date:   Tue, 5 Oct 2021 08:38:53 +0200
From:   Juergen Gross <>
To:     Jan Beulich <>,
        Boris Ostrovsky <>
Cc:     Stefano Stabellini <>,
        lkml <>,
        Roger Pau Monné <>,
        "" <>
Subject: Re: [PATCH v2 0/9] xen/x86: PVH Dom0 fixes and fallout adjustments

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 actually
> spotted one piece of PV Dom0 breakage as well, a fix for which is also
> included here.
> 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.)
> v2 merely addresses small review comments in patches 7 and 9 (see there).
> 1: xen/x86: prevent PVH type from getting clobbered
> 2: xen/x86: allow PVH Dom0 without XEN_PV=y
> 3: xen/x86: make "earlyprintk=xen" work better for PVH Dom0
> 4: xen/x86: allow "earlyprintk=xen" to work for PV Dom0
> 5: xen/x86: make "earlyprintk=xen" 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


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