Re: [Xen-devel] [PATCH v3 3/3] xen: rework paging_log_dirty_op to work with hvm guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.05.15 at 13:55, <roger.pau@xxxxxxxxxx> wrote:
> El 14/04/15 a les 14.14, Jan Beulich ha escrit:
>>>>> On 10.04.15 at 19:29, <roger.pau@xxxxxxxxxx> wrote:
>>> +                    BUG_ON(((pages >> 3) % PAGE_SIZE) + bytes > PAGE_SIZE);
>> 
>> I don't seem to be able to spot the original for this one. If there
>> was none, please make this an ASSERT() instead.
> 
> Yes, there's no previous BUG_ON because this was not a problem in the
> past, since we could write to any position on dirty_bitmap, but that's
> not the case any more. Since we only have one page mapped at a time we
> need to make sure that what we are about to write doesn't cross a page
> boundary.
> 
> I understand this is not an ideal solution, but AFAICT there's no easy
> way to deal with writes that expand over a page boundary.

I'm afraid I don't really see what you're asking for. Just to clarify -
I didn't put anything under question, all I asked for was to use
ASSERT() instead of BUG_ON() here. Yet what you wrote above
doesn't seem to related to that request.

Jan


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