Re: [Qemu-devel] [PATCH for 2.1 2/2] memory-backend-file: improve error handling

[Eric Blake]

On 07/03/2014 08:56 PM, Hu Tao wrote:
> On Thu, Jul 03, 2014 at 06:33:28AM -0600, Eric Blake wrote:
>> On 07/03/2014 12:10 AM, Hu Tao wrote:
>>> This patch fixes two problems of memory-backend-file:
>>>
>>> 1. If user adds a memory-backend-file object using object_add command,
>>>    specifying a non-existing directory for property mem-path, qemu
>>>    will core dump with message:
>>>
>>>      /nonexistingdir: No such file or directory
>>>      Bad ram offset fffffffffffff000
>>>      Aborted (core dumped)
>>>
>>> 2. If user adds a memory-backend-file object using object_add command,
>>>    specifying a size that is less than huge page size, qemu
>>>    will core dump with message:
>>>
>>>      Bad ram offset fffffffffffff000
>>>      Aborted (core dumped)
>>>
>>
>> Might be nice if the commit message also shows the new message issued
>> for the same cases after the patch is applied.
> 
> OK.
> 

>>>  
>>>      if (memory < hpagesize) {
>>> -        return NULL;
>>> +        error_setg(errp, "memory size 0x" RAM_ADDR_FMT " should be larger "
>>> +                   "than huge page size 0x%" PRIx64, memory, hpagesize);
>>> +        goto error;
>>
>> Isn't exactly equal also allowed?  Maybe a better wording is "should be
>> a multiple of the huge page size"
> 
> Yes. I'll change the error message.
> 

Thinking about it more, should you also enforce that it is a multiple?

As in: if (!memory || memory % hpageszie) { error... }

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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