linux-kernel - Re: [PATCH 3/9] xen/x86: make "earlyprintk=xen" work better for PVH Dom0

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Date:   Thu, 23 Sep 2021 16:05:54 +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>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 3/9] xen/x86: make "earlyprintk=xen" work better for PVH
 Dom0

On 07.09.21 12:09, Jan Beulich wrote:
> The xen_hvm_early_write() path better wouldn't be taken in this case;
> while port 0xE9 can be used, the hypercall path is quite a bit more
> efficient. Put that first, as it may also work for DomU-s (see also
> xen_raw_console_write()).
> 
> While there also bail from the function when the first
> domU_write_console() failed - later ones aren't going to succeed.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>

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


Juergen

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