Re: [Xen-devel] Page fault for paravirtualization?

To:	Jun Koi <junkoi2004@xxxxxxxxx>
Subject:	Re: [Xen-devel] Page fault for paravirtualization?
From:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date:	Thu, 22 Jan 2009 15:21:04 +0000
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On 22/01/2009 14:55, "Jun Koi" <junkoi2004@xxxxxxxxx> wrote:

> On Thu, Jan 22, 2009 at 7:21 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
> wrote:
>> We don't call paging_fault() for PV guests (unless doing live migration).
>> Paging_mode_enabled() and paging_mode_external() will both return 0.
>> 
> 
> Oops I skip that code, so missed it. Thanks!
> 
> BTW, this code in xen/arch/x86/traps.c::fixup_page_fault() looks
> suspicious: the VM_ASSIST check looks bogus. Is that dead code?

No, we only emulate pagetable writes for PV guests if the guest wants us to.

 -- Keir



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Re: [Xen-devel] Page fault for paravirtualization?