From owner-freebsd-xen@freebsd.org  Mon May 21 09:03:28 2018
Return-Path: <owner-freebsd-xen@freebsd.org>
Delivered-To: freebsd-xen@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 73792EEA34C
 for <freebsd-xen@mailman.ysv.freebsd.org>;
 Mon, 21 May 2018 09:03:28 +0000 (UTC)
 (envelope-from prvs=6724271a8=roger.pau@citrix.com)
Received: from SMTP.EU.CITRIX.COM (smtp.ctxuk.citrix.com [185.25.65.24])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "mail.citrix.com",
 Issuer "DigiCert SHA2 Secure Server CA" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 06BBD74F76;
 Mon, 21 May 2018 09:03:25 +0000 (UTC)
 (envelope-from prvs=6724271a8=roger.pau@citrix.com)
X-IronPort-AV: E=Sophos;i="5.49,426,1520899200"; d="scan'208";a="73449245"
Date: Mon, 21 May 2018 11:03:10 +0200
From: Roger Pau =?utf-8?B?TW9ubsOp?= <roger.pau@citrix.com>
To: Pratyush Yadav <pratiy0100@gmail.com>
CC: <freebsd-xen@freebsd.org>, Akshay Jaggi <jaggi@freebsd.org>, Edward
 Napierala <trasz@freebsd.org>
Subject: Re: Xen kernel fails to boot, d0v1 triple fault looks like the cuplrit
Message-ID: <20180521090310.c46eexnwe4c7w62x@MacBook-Pro-de-Roger.local>
References: <CA+X=3T+YiUmNNPSSA36QmwYsamgAf0hHEsEock-FcomCHc-Jww@mail.gmail.com>
 <20180519081030.qhzyjdrpwcekmcac@MacBook-Pro-de-Roger.local>
 <CA+X=3TKazXMk+UqL35Fzoa-F7YQWWtt-c6BSSNJQqL-WC31D1A@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <CA+X=3TKazXMk+UqL35Fzoa-F7YQWWtt-c6BSSNJQqL-WC31D1A@mail.gmail.com>
User-Agent: NeoMutt/20180323
X-ClientProxiedBy: AMSPEX02CAS01.citrite.net (10.69.22.112) To
 AMSPEX02CL02.citrite.net (10.69.22.126)
X-BeenThere: freebsd-xen@freebsd.org
X-Mailman-Version: 2.1.26
Precedence: list
List-Id: Discussion of the freebsd port to xen - implementation and usage
 <freebsd-xen.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-xen>,
 <mailto:freebsd-xen-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-xen/>
List-Post: <mailto:freebsd-xen@freebsd.org>
List-Help: <mailto:freebsd-xen-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-xen>,
 <mailto:freebsd-xen-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 21 May 2018 09:03:28 -0000

Please try to avoid top posting.

On Sat, May 19, 2018 at 03:45:41PM +0530, Pratyush Yadav wrote:
> Hi,
> 
> The line is
> 
> /usr/src/sys/amd64/amd64/mp_machdep.c:307

Hm, it seems like dbg_stack is not properly allocated. Can you please
try the above debug patch and paste the boot log?

---8<---
diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c
index 301461420874..8854242b4bf5 100644
--- a/sys/amd64/amd64/mp_machdep.c
+++ b/sys/amd64/amd64/mp_machdep.c
@@ -304,6 +304,7 @@ init_secondary(void)
 
 	/* Save the per-cpu pointer for use by the DB# handler. */
 	np = ((struct nmi_pcpu *) &dbg_stack[PAGE_SIZE]) - 1;
+printf("ID %d dbg_stack: %p per-cpu: %p\n", cpu, dbg_stack, np);
 	np->np_pcpu = (register_t) pc;
 
 	wrmsr(MSR_FSBASE, 0);		/* User value */
@@ -403,6 +404,7 @@ native_start_all_aps(void)
 		    M_WAITOK | M_ZERO);
 		dbg_stack = (char *)kmem_malloc(kernel_arena, PAGE_SIZE,
 		    M_WAITOK | M_ZERO);
+printf("allocated dbg_stack: %p\n", dbg_stack);
 		dpcpu = (void *)kmem_malloc(kernel_arena, DPCPU_SIZE,
 		    M_WAITOK | M_ZERO);