From: Daniel De Graaf <dgdegra@tycho.nsa.gov>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Subject: Re: memory map issues with PV PCI passthrough
Date: Thu, 08 Dec 2011 09:54:13 -0500 [thread overview]
Message-ID: <4EE0CF95.8030102@tycho.nsa.gov> (raw)
In-Reply-To: <1323355624.12878.1.camel@zakaz.uk.xensource.com>
On 12/08/2011 09:47 AM, Ian Campbell wrote:
> On Thu, 2011-12-08 at 14:39 +0000, Daniel De Graaf wrote:
>> I have a system with several reserved ranges low in the e820 map which
>> cause problems when starting PV domains with PCI devices. The machine
>> memory map looks like:
>>
>> (XEN) 0000000000000000 - 0000000000060000 (usable)
>> (XEN) 0000000000060000 - 0000000000068000 (reserved)
>> (XEN) 0000000000068000 - 000000000009ac00 (usable)
>> (XEN) 000000000009ac00 - 00000000000a0000 (reserved)
>> (XEN) 00000000000e0000 - 0000000000100000 (reserved)
>> (XEN) 0000000000100000 - 0000000000800000 (usable)
>> (XEN) 0000000000800000 - 000000000087d000 (unusable)
>> (XEN) 000000000087d000 - 0000000000f00000 (usable)
>> (XEN) 0000000000f00000 - 0000000001000000 (reserved)
>> (XEN) 0000000001000000 - 0000000020000000 (usable)
>> (XEN) 0000000020000000 - 0000000020200000 (reserved)
>> (XEN) 0000000020200000 - 0000000040000000 (usable)
>> (XEN) 0000000040000000 - 0000000040200000 (reserved)
>> (XEN) 0000000040200000 - 00000000c95d6000 (usable)
>> (XEN) 00000000c95d6000 - 00000000c961a000 (reserved)
>> (XEN) 00000000c961a000 - 00000000c99b7000 (usable)
>> (XEN) 00000000c99b7000 - 00000000c99e7000 (reserved)
>> (XEN) 00000000c99e7000 - 00000000c9be7000 (ACPI NVS)
>> (XEN) 00000000c9be7000 - 00000000c9bff000 (ACPI data)
>> (XEN) 00000000c9bff000 - 00000000c9c00000 (usable)
>> (XEN) 00000000c9f00000 - 00000000ca000000 (reserved)
>> (XEN) 00000000cb000000 - 00000000cf200000 (reserved)
>> (XEN) 00000000fed1c000 - 00000000fed30000 (reserved)
>> (XEN) 00000000ffc00000 - 00000000ffc20000 (reserved)
>> (XEN) 0000000100000000 - 000000042e000000 (usable)
>>
>> When e820_sanitize is called on this memory map to create a PV domain, the
>> resulting map has only one usable region (0-0xf00000) below 4GB, and Linux
>> will not boot with this memory map.
>
> Are you using xl's e820_host option?
>
> Ian.
>
>
Yes, since enabling PCI passthrough in a PV guest enables this.
--
Daniel De Graaf
National Security Agency
next prev parent reply other threads:[~2011-12-08 14:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-08 14:39 memory map issues with PV PCI passthrough Daniel De Graaf
2011-12-08 14:47 ` Ian Campbell
2011-12-08 14:54 ` Daniel De Graaf [this message]
2011-12-14 21:53 ` Konrad Rzeszutek Wilk
2011-12-14 22:36 ` Daniel De Graaf
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