From: Olaf Hering <olaf@aepfle.de>
To: xen-devel@lists.xen.org
Subject: identify a Xen PV domU to fix devmem_is_allowed
Date: Mon, 29 Feb 2016 11:28:49 +0100 [thread overview]
Message-ID: <20160229102849.GA18202@aepfle.de> (raw)
What is the correct way to identify a Xen PV domU in the kenrel?
devmem_is_allowed() used to disable access to pages < 256 in domU.
With pvops this check was removed, or never ported forward.
Would this change be the correct fix?
+++ b/arch/x86/mm/init.c
@@ -637,7 +637,7 @@ void __init init_mem_mapping(void)
int devmem_is_allowed(unsigned long pagenr)
{
if (pagenr < 256)
- return 1;
+ return !xen_pv_domain();
if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
return 0;
if (!page_is_ram(pagenr))
Olaf
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next reply other threads:[~2016-02-29 10:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 10:28 Olaf Hering [this message]
2016-02-29 15:10 ` identify a Xen PV domU to fix devmem_is_allowed Konrad Rzeszutek Wilk
2016-02-29 15:29 ` Olaf Hering
2016-02-29 18:32 ` Boris Ostrovsky
2016-03-01 15:14 ` Olaf Hering
2016-03-01 10:38 ` Jan Beulich
2016-03-01 14:34 ` Konrad Rzeszutek Wilk
2016-03-01 14:45 ` Boris Ostrovsky
2016-03-15 16:57 ` Olaf Hering
2016-03-15 18:56 ` Boris Ostrovsky
2016-03-21 21:29 ` Boris Ostrovsky
2016-03-22 18:37 ` Boris Ostrovsky
2016-03-23 8:28 ` Olaf Hering
2016-06-06 21:17 ` Olaf Hering
2016-03-01 16:23 ` Olaf Hering
2016-03-01 15:29 ` David Vrabel
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