linux-kernel - Re: [PATCH v2] Do not reserve crashkernel high memory if crashkernel low memory reserving failed

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Message-ID: <20150727140317.GN10969@8bytes.org>
Date:	Mon, 27 Jul 2015 16:03:17 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Baoquan He <bhe@...hat.com>, Dave Young <dyoung@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Vivek Goyal <vgoyal@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Do not reserve crashkernel high memory if crashkernel
 low memory reserving failed

On Wed, Jul 22, 2015 at 04:41:00PM -0700, Yinghai Lu wrote:
> Do you mean BIOS have that disabled with not exposing DMAR table ?
> 
> kernel for RHEL 6 and RHEL7 have them enabled.
> Also opensuse kernel have that enabled too.

You still need to pass intel_iommu=on in the kernel command line to
enable its usage.



	Joerg

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