On 27/07/15 10:30, David Vrabel wrote:
> On 25/07/15 00:21, Julien Grall wrote:
>> On 24/07/2015 12:47, David Vrabel wrote:
>>> @@ -550,6 +551,11 @@ int alloc_xenballooned_pages(int nr_pages, struct
>>> page **pages)
>>> page = balloon_retrieve(true);
>>> if (page) {
>>> pages[pgno++] = page;
>>> +#ifdef CONFIG_XEN_HAVE_PVMMU
>>> + ret = xen_alloc_p2m_entry(page_to_pfn(page));
>>
>> Don't you want to call this function only when the guest is not using
>> auto-translated physmap?
>
> xen_alloc_p2m_entry() is a nop in auto-xlate guests, so no need for an
> additional check here.
I don't have the impression it's the case or it's not obvious.
For instance xen_p2m_addr, used within with the xen_alloc_p2m_entry (old
name alloc_p2m) is never set for auto-xlate guests. Therefore the value
is 0.
Same for p2m_identity and p2m_missing & co.
Regards,
--
Julien Grall
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