xen-ia64-devel

[Top] [All Lists]

[Xen-ia64-devel] [PATCH 0/2] vdso fix

from [Isaku Yamahata]

[Permanent Link][Original]

To:	xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-ia64-devel] [PATCH 0/2] vdso fix
From:	Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date:	Thu, 24 Aug 2006 18:42:16 +0900
Cc:	Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Delivery-date:	Thu, 24 Aug 2006 02:42:34 -0700
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
List-help:	<mailto:xen-ia64-devel-request@lists.xensource.com?subject=help>
List-id:	Discussion of the ia64 port of Xen <xen-ia64-devel.lists.xensource.com>
List-post:	<mailto:xen-ia64-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-ia64-devel>, <mailto:xen-ia64-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-ia64-devel>, <mailto:xen-ia64-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent:	Mutt/1.4.2.1i

__kernel_syscall_via_epc masks interrupt assuming page fault on the vDSO page
can't occur during executing.
However Xen might preempt vcpu when interrupt is disabled so that
page fault might occur with interrupt masked unlike baremetal case.
Such page fault results in acquiring semaphore with interrupt disabled.
see ia64_do_page_fault().
It means that we can't disable interrupt in vDSO page on xen environment.
So we jumps kernel text area which is pinned by ITR before disabling interrupt
to avoid such page fault.

thanks.

_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel

[More with this subject...]

<Prev in Thread]	Current Thread	[Next in Thread>
[Xen-ia64-devel] [PATCH 0/2] vdso fix, Isaku Yamahata <= Re: [Xen-ia64-devel] [PATCH 0/2] vdso fix, Isaku Yamahata

Previous by Date:	PATCH: cleanup - was Re: [Xen-ia64-devel] xen-ia64-unstable.hg status, Tristan Gingold
Next by Date:	[Xen-ia64-devel] [PATCH 2/2] vdso fix, Isaku Yamahata
Previous by Thread:	[Xen-ia64-devel] Xen/IA64 Healthiness Report -Cset#11265, You, Yongkang
Next by Thread:	Re: [Xen-ia64-devel] [PATCH 0/2] vdso fix, Isaku Yamahata
Indexes:	[Date] [Thread] [Top] [All Lists]