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Re: [Qemu-devel] [PATCH v1] exec: handle NULL pointer in flatview_read_c

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v1] exec: handle NULL pointer in flatview_read_continue
Date: Thu, 9 Aug 2018 16:52:22 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 09/08/2018 16:38, Olaf Hering wrote:
> Am Thu, 9 Aug 2018 16:37:05 +0200
> schrieb Paolo Bonzini <address@hidden>:
>> If no RAM is allocated (i.e. xen_map_cache will return NULL), however,
>> the memory should not be registered as RAM with the memory API.  So I
>> think the bug is in Xen code.
> Someone familiar with that code has to figure that out. A ballooned page will 
> trigger that bug.

I guess that's the answer.  I think the simplest fix is for the map
cache to set aside a zero page and return it whenever it is asked for a
ballooned page.


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