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a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1630509865; 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=UDNb358/nQzDG8jtYlhrBrmnU7HIB/SQi6GDbLNHHRM=; b=N+CdnPNdkGF2+88rmtd5N9EvrgQi+3UcsW1BWTu7wpNt7Yi66kVZceRekPvc7iZnVC1GA0 OVXfUNpIGYs599vTyrN3ucXATmUeBRIOLVjJCcZ5CXFXBxCiSi5RFxI9amFaOyY+3hQE3N R6tDOJ0C2lMQhPXm2YLrSdjj0Gff31A= Subject: Re: [PATCH 0/4] x86/PVH: Dom0 building adjustments To: Jan Beulich , "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= References: <1d600035-851a-190a-f744-8cd7b2d887fd@suse.com> From: Juergen Gross Message-ID: <02ebe247-6891-dbdf-82f7-5b33b5a08dd5@suse.com> Date: Wed, 1 Sep 2021 17:24:24 +0200 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: <1d600035-851a-190a-f744-8cd7b2d887fd@suse.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Iqbl49u9DNzZ0n75ACpqzJ0tOW9ot3wUF" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Iqbl49u9DNzZ0n75ACpqzJ0tOW9ot3wUF Content-Type: multipart/mixed; boundary="KfmP4bymJzv4KKJycYhWi0mz7a5vFdZ3t"; protected-headers="v1" From: Juergen Gross To: Jan Beulich , "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Message-ID: <02ebe247-6891-dbdf-82f7-5b33b5a08dd5@suse.com> Subject: Re: [PATCH 0/4] x86/PVH: Dom0 building adjustments References: <1d600035-851a-190a-f744-8cd7b2d887fd@suse.com> In-Reply-To: <1d600035-851a-190a-f744-8cd7b2d887fd@suse.com> --KfmP4bymJzv4KKJycYhWi0mz7a5vFdZ3t Content-Type: multipart/mixed; boundary="------------A9357959A655AB520B15A2F3" Content-Language: en-US This is a multi-part message in MIME format. --------------A9357959A655AB520B15A2F3 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 01.09.21 17:06, Jan Beulich wrote: > On 30.08.2021 15:01, Jan Beulich wrote: >> The code building PVH Dom0 made use of sequences of P2M changes >> which are disallowed as of XSA-378. First of all population of the >> first Mb of memory needs to be redone. Then, largely as a >> workaround, checking introduced by XSA-378 needs to be slightly >> relaxed. >> >> Note that with these adjustments I get Dom0 to start booting on my >> development system, but the Dom0 kernel then gets stuck. Since it >> was the first time for me to try PVH Dom0 in this context (see >> below for why I was hesitant), I cannot tell yet whether this is >> due further fallout from the XSA, or some further unrelated >> problem. Dom0's BSP is in VPF_blocked state while all APs are >> still in VPF_down. The '0' debug key, unhelpfully, doesn't produce >> any output, so it's non-trivial to check whether (like PV likes to >> do) Dom0 has panic()ed without leaving any (visible) output. >=20 > Having made '0' work at least partly, I can now see that Dom0's > vCPU0 enters its idle loop after having gone through all normal > initialization. Clearly certain things must not have worked as > intended (no APs booted, no drivers loaded afaict), but I'm > having a hard time seeing how to find out what that might be > when there's no output at all. PV Dom0 does not require any > special command line option to do output to both the VGA console > and through hvc_xen (making its output also go to the serial > log) - is this perhaps different for PVH? I couldn't find > anything under docs/ ... Did you add earlyprintk=3Dxen to the dom0 boot parameters? 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