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

from [Isaku Yamahata]

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Subject:	Re: [Xen-ia64-devel] [PATCH 0/2] vdso fix
From:	Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date:	Thu, 24 Aug 2006 20:01:22 +0900
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This explanation is wrong. Please ignore those patches.
Sorry for confution.

On Thu, Aug 24, 2006 at 06:42:16PM +0900, Isaku Yamahata wrote:
> 
> __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

-- 
yamahata

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