linux-kernel - Re: [PATCH 7/9] xen/x86: hook up xen

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Date:   Thu, 23 Sep 2021 16:59:34 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Jan Beulich <jbeulich@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 7/9] xen/x86: hook up xen_banner() also for PVH

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. Clearly
> this then needs re-introducing the XENFEAT_mmu_pt_update_preserve_ad
> check that was recently removed, as that's a PV-only feature.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> 
> --- 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) == NULL) ? -ENODEV : 0);
>   }
>   
> +void __init xen_banner(void)
> +{
> +	unsigned version = 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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