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Subject: Re: [PATCH 3/9] xen/x86: make "earlyprintk=xen" work better for PVH
 Dom0
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>,
        "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
References: <4efa804e-3250-227f-00c7-347581366cd4@suse.com>
 <ecf17c7b-09a4-29a7-6951-1e0b0dda3c67@suse.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <5d6f47fd-67e9-4095-7db2-4609ab3c820a@suse.com>
Date:   Thu, 23 Sep 2021 16:05:54 +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>,
 "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Message-ID: <5d6f47fd-67e9-4095-7db2-4609ab3c820a@suse.com>
Subject: Re: [PATCH 3/9] xen/x86: make "earlyprintk=xen" work better for PVH
 Dom0
References: <4efa804e-3250-227f-00c7-347581366cd4@suse.com>
 <ecf17c7b-09a4-29a7-6951-1e0b0dda3c67@suse.com>
In-Reply-To: <ecf17c7b-09a4-29a7-6951-1e0b0dda3c67@suse.com>

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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()).
>=20
> While there also bail from the function when the first
> domU_write_console() failed - later ones aren't going to succeed.
>=20
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

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


Juergen

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