Re: [Xen-devel] [PATCH RFC 4/4] xen: arch-specific hooks for domain_soft_reset()

[Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>]

Tim Deegan <tim@xxxxxxx> writes:

> At 15:35 +0200 on 03 Jun (1433345722), Vitaly Kuznetsov wrote:
>> x86-specific hook cleans up the pirq-emuirq mappings and replaces the
>> shared_info frame with an empty page to support subsequent
>> XENMAPSPACE_shared_info call.
>
> That's a bit roundabout.  I think we might be better off allocating a
> new shared-info page and abandoning the old one as an ordinary guest
> RAM page.
>

I've tried looking into such approach and there is an issue: shared_info
page is being allocated from Xen heap and in case it's built with
CONFIG_SEPARATE_XENHEAP we can't just reassign the page to the domain's
pagelist or we'll open a possibility for a domain to move itself
entirely to Xen's heap by e.g looping over all its gfns, doing
XENMAPSPACE_shared_info and perforting soft reset.

-- 
  Vitaly

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