From: "Jan Beulich" <JBeulich@novell.com>
To: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: iommu=0 leading to panic when system defaults to using x2apic
Date: Fri, 10 Dec 2010 09:12:21 +0000 [thread overview]
Message-ID: <4D01FD050200007800027296@vpn.id2.novell.com> (raw)
Why wouldn't iommu=0 imply not using the x2apic, if use of the
iommu indeed is a prerequisite (which by itself seems questionable
as long as APIC IDs aren't wider than 8 bits)?
Looking further at enable_bsp_x2apic(), I also wonder whether
the pre-enabled case, when specifying iommu=0 and x2apic=0,
can actually work if iommu=0 is a prerequisite (intremap_enabled()
would return 1 in that case afaics, so the early check doesn't help).
Thanks, Jan
next reply other threads:[~2010-12-10 9:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-10 9:12 Jan Beulich [this message]
2010-12-10 10:06 ` iommu=0 leading to panic when system defaults to using x2apic Keir Fraser
2010-12-10 10:58 ` Jan Beulich
2010-12-10 11:47 ` Keir Fraser
2010-12-10 12:02 ` Jan Beulich
2010-12-10 15:00 ` Zhang, Yang Z
2010-12-10 15:39 ` Jan Beulich
2010-12-10 18:26 ` Kay, Allen M
2010-12-10 18:49 ` Keir Fraser
2010-12-11 0:07 ` Kay, Allen M
2010-12-13 8:15 ` Jan Beulich
2010-12-13 9:03 ` Keir Fraser
2010-12-14 2:25 ` Kay, Allen M
2010-12-14 7:44 ` Keir Fraser
2010-12-14 7:59 ` Keir Fraser
2010-12-15 2:35 ` Kay, Allen M
2010-12-14 8:21 ` Jan Beulich
2010-12-14 8:46 ` Weidong Han
2010-12-14 9:12 ` Jan Beulich
2010-12-14 16:53 ` Kay, Allen M
2010-12-14 17:06 ` Jan Beulich
2010-12-14 17:08 ` Jan Beulich
2010-12-14 17:52 ` Yinghai Lu
2010-12-14 18:18 ` Keir Fraser
2010-12-15 7:53 ` Jan Beulich
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