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Fri, 21 May 2021 07:45:40 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 9640BAACA; Fri, 21 May 2021 07:45:39 +0000 (UTC) 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: c584965b-0326-4988-a95b-0ea1611794cd X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1621583139; 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=/sMvNp+9lKkN+WiHz3qNpqJVARtOU7zT7NAo9LzV8rU=; b=lXvVE1ZGhPjH2EZB2MVm75MauFOOxpZ0wp6bf7V04u5oo3V1ymGp9U0BYRQ4U8rLG1NNug RS/iYtICwtUO8pjCJCmifcHX8ajoe88VSy0eLBazBE2uCMZAtoIdIwLw0IKxlfPCtkEsLm pBYSf/KiPeiaCS+XJzHZzrKfiXWkIeU= To: Jan Beulich Cc: "xen-devel@lists.xenproject.org" , Boris Ostrovsky References: <12a866b0-9e89-59f7-ebeb-a2a6cec0987a@suse.com> <65bbc317-893e-da41-97e0-c8f2e1feb3e2@suse.com> <3953076f-c2fa-2e2a-4b07-fb610046a27d@suse.com> <89c46d1a-9474-0f17-3fda-4809a14adb45@suse.com> From: Juergen Gross Subject: Re: [PATCH] x86/Xen: swap NX determination and GDT setup on BSP Message-ID: <2d019c04-415b-293b-052b-26b1ea3be189@suse.com> Date: Fri, 21 May 2021 09:45:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <89c46d1a-9474-0f17-3fda-4809a14adb45@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="xYVPNHcK2UiZjHVM9n8b5M6RfVqE7AsuZ" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --xYVPNHcK2UiZjHVM9n8b5M6RfVqE7AsuZ Content-Type: multipart/mixed; boundary="PwWjzX44LP6A6yeUvPoM1lSs3gpCYXqct"; protected-headers="v1" From: Juergen Gross To: Jan Beulich Cc: "xen-devel@lists.xenproject.org" , Boris Ostrovsky Message-ID: <2d019c04-415b-293b-052b-26b1ea3be189@suse.com> Subject: Re: [PATCH] x86/Xen: swap NX determination and GDT setup on BSP References: <12a866b0-9e89-59f7-ebeb-a2a6cec0987a@suse.com> <65bbc317-893e-da41-97e0-c8f2e1feb3e2@suse.com> <3953076f-c2fa-2e2a-4b07-fb610046a27d@suse.com> <89c46d1a-9474-0f17-3fda-4809a14adb45@suse.com> In-Reply-To: <89c46d1a-9474-0f17-3fda-4809a14adb45@suse.com> --PwWjzX44LP6A6yeUvPoM1lSs3gpCYXqct Content-Type: multipart/mixed; boundary="------------4B6D1E5FAC04B12CF593AF73" Content-Language: en-US This is a multi-part message in MIME format. --------------4B6D1E5FAC04B12CF593AF73 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 21.05.21 09:26, Jan Beulich wrote: > On 21.05.2021 09:18, Juergen Gross wrote: >> On 20.05.21 14:08, Jan Beulich wrote: >>> On 20.05.2021 13:57, Juergen Gross wrote: >>>> On 20.05.21 13:42, Jan Beulich wrote: >>>>> xen_setup_gdt(), via xen_load_gdt_boot(), wants to adjust page tabl= es. >>>>> For this to work when NX is not available, x86_configure_nx() needs=20 to >>>>> be called first. >>>>> >>>>> Reported-by: Olaf Hering >>>>> Signed-off-by: Jan Beulich >>>> >>>> Reviewed-by: Juergen Gross >>> >>> Thanks. I guess I forgot >>> >>> Cc: stable@vger.kernel.org >>> >>> If you agree, can you please add this before pushing to Linus? >> >> Uh, just had a look why x86_configure_nx() was called after >> xen_setup_gdt(). >> >> Upstream your patch will be fine, but before kernel 5.9 it will >> break running as 32-bit PV guest (see commit 36104cb9012a82e7). >=20 > Oh, indeed. That commit then actually introduced the issue here, > and hence a Fixes: tag may be warranted. Added it already. :-) And I've limited the backport to happen not for 5.8 and older, of course. 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