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Subject: Re: [PATCH 2/9] xen/x86: allow PVH Dom0 without XEN_PV=y
To:     Jan Beulich <jbeulich@suse.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc:     Stefano Stabellini <sstabellini@kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
        Konrad Wilk <konrad.wilk@oracle.com>
References: <4efa804e-3250-227f-00c7-347581366cd4@suse.com>
 <2254771e-68ff-e190-15b4-42ed92239712@suse.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <8fd63619-811b-b8ca-1655-513acb3f90c2@suse.com>
Date:   Thu, 23 Sep 2021 16:03:52 +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>,
 "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
 Konrad Wilk <konrad.wilk@oracle.com>
Message-ID: <8fd63619-811b-b8ca-1655-513acb3f90c2@suse.com>
Subject: Re: [PATCH 2/9] xen/x86: allow PVH Dom0 without XEN_PV=y
References: <4efa804e-3250-227f-00c7-347581366cd4@suse.com>
 <2254771e-68ff-e190-15b4-42ed92239712@suse.com>
In-Reply-To: <2254771e-68ff-e190-15b4-42ed92239712@suse.com>

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On 07.09.21 12:08, Jan Beulich wrote:
> Decouple XEN_DOM0 from XEN_PV, converting some existing uses of XEN_DOM=
0
> to a new XEN_PV_DOM0. (I'm not convinced all are really / should really=

> be PV-specific, but for starters I've tried to be conservative.)
>=20
> For PVH Dom0 the hypervisor populates MADT with only x2APIC entries, so=

> without x2APIC support enabled in the kernel things aren't going to wor=
k
> very well. (As opposed, DomU-s would only ever see LAPIC entries in MAD=
T
> as of now.) Note that this then requires PVH Dom0 to be 64-bit, as
> X86_X2APIC depends on X86_64.
>=20
> In the course of this xen_running_on_version_or_later() needs to be
> available more broadly. Move it from a PV-specific to a generic file,
> considering that what it does isn't really PV-specific at all anyway.
>=20
> Note that xen/interface/version.h cannot be included on its own; in
> enlighten.c, which uses SCHEDOP_* anyway, include xen/interface/sched.h=

> first to resolve the apparently sole missing type (xen_ulong_t).
>=20
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen

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