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Subject: Re: [PATCH 7/9] xen/x86: hook up xen_banner() also for PVH
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>
References: <4efa804e-3250-227f-00c7-347581366cd4@suse.com>
 <5af11027-cf9d-cf78-9f48-b2ce2edd6e62@suse.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <2ded8c58-b9c3-89dc-6883-1794d1c4126a@suse.com>
Date:   Thu, 23 Sep 2021 16:59:34 +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>
Message-ID: <2ded8c58-b9c3-89dc-6883-1794d1c4126a@suse.com>
Subject: Re: [PATCH 7/9] xen/x86: hook up xen_banner() also for PVH
References: <4efa804e-3250-227f-00c7-347581366cd4@suse.com>
 <5af11027-cf9d-cf78-9f48-b2ce2edd6e62@suse.com>
In-Reply-To: <5af11027-cf9d-cf78-9f48-b2ce2edd6e62@suse.com>

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On 07.09.21 12:11, Jan Beulich wrote:
> This was effectively lost while dropping PVHv1 code. Move the function
> and arrange for it to be called the same way as done in PV mode. Clearl=
y
> this then needs re-introducing the XENFEAT_mmu_pt_update_preserve_ad
> check that was recently removed, as that's a PV-only feature.
>=20
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
>=20
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -261,6 +261,18 @@ int xen_vcpu_setup(int cpu)
>   	return ((per_cpu(xen_vcpu, cpu) =3D=3D NULL) ? -ENODEV : 0);
>   }
>  =20
> +void __init xen_banner(void)
> +{
> +	unsigned version =3D HYPERVISOR_xen_version(XENVER_version, NULL);
> +	struct xen_extraversion extra;

Please add a blank line here.

> +	HYPERVISOR_xen_version(XENVER_extraversion, &extra);
> +
> +	pr_info("Booting paravirtualized kernel on %s\n", pv_info.name);

Is this correct? I don't think the kernel needs to be paravirtualized
with PVH (at least not to the same extend as for PV).


Juergen

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