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Mon, 6 Dec 2021 14:17:24 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id YwUeBXQbrmFENgAAMHmgww (envelope-from ); Mon, 06 Dec 2021 14:17:24 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 3bd67aa1-569f-11ec-8a4d-196798b21f7b DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1638800244; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ci4XGMPd4XtETtT8yrd6qqmUEhD9O23TZHpCQkVi1tk=; b=P8H03erbeHbkyRoLuX8UKi1ZswOrKYHzumFywaQfHesIRVEi23MmdkXbwm5UWGqVKC0prV 5uJ8ASQDZrKIFQdPAfI6SyLrW0RXd0mojhSNyGF7qpklNV/4mEVjc7/mG1F0MV+XhylMwd hYNdF4r9iYTdExGrGkYUuGIlEfCMxRU= To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, wl@xen.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org References: <20211206072337.9517-1-jgross@suse.com> <20211206124612.24758-1-jgross@suse.com> <39a4ae01-7ea9-7526-74da-1fea71274890@suse.com> From: Juergen Gross Subject: Re: [PATCH] mini-os: support event channel 0 for console Message-ID: <4cd75f8f-9026-9d3b-750b-3f3c6eb200c2@suse.com> Date: Mon, 6 Dec 2021 15:17:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <39a4ae01-7ea9-7526-74da-1fea71274890@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="EldJmA8XQezjl9Kra1ypXlj8GflOIsPrP" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --EldJmA8XQezjl9Kra1ypXlj8GflOIsPrP Content-Type: multipart/mixed; boundary="2hNHuU50ZUpvu1NRS1f8nBdWgvnfgdhwD"; protected-headers="v1" From: Juergen Gross To: Jan Beulich Cc: samuel.thibault@ens-lyon.org, wl@xen.org, minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Message-ID: <4cd75f8f-9026-9d3b-750b-3f3c6eb200c2@suse.com> Subject: Re: [PATCH] mini-os: support event channel 0 for console References: <20211206072337.9517-1-jgross@suse.com> <20211206124612.24758-1-jgross@suse.com> <39a4ae01-7ea9-7526-74da-1fea71274890@suse.com> In-Reply-To: <39a4ae01-7ea9-7526-74da-1fea71274890@suse.com> --2hNHuU50ZUpvu1NRS1f8nBdWgvnfgdhwD Content-Type: multipart/mixed; boundary="------------FD3935A15D5EE7887C6FDEA3" Content-Language: en-US This is a multi-part message in MIME format. --------------FD3935A15D5EE7887C6FDEA3 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 06.12.21 14:24, Jan Beulich wrote: > On 06.12.2021 13:46, Juergen Gross wrote: >> The console event channel might be 0 for the console, so use the value= >> of ~0 as invalid instead. >=20 > I may be missing something mini-os specific here, but in Xen channel 0 > is always invalid. It's not just here that this value would be used as > a sentinel. This made me look at th domain creation paths again, and it seems as if the parameter settings for HVM guests is split in an awful way: the console ring page pfn is set from libxenguest, while the console event channel is set from libxl only. :-( This means that this patch can be dropped, while init-xenstore-domain needs to gain another one. 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