Re: [dpdk-dev] [PATCH v2 09/11] lib/librte_vhost: vhost user support

["Xie, Huawei" <huawei.xie@intel.com>]

On 2/12/2015 4:28 PM, Linhaifeng wrote:
>
> On 2015/2/12 13:07, Huawei Xie wrote:
>> +
>> +		/* This is ugly */
>> +		mapped_size = memory.regions[idx].memory_size +
>> +			memory.regions[idx].mmap_offset;
>> +		mapped_address = (uint64_t)(uintptr_t)mmap(NULL,
>> +			mapped_size,
>> +			PROT_READ | PROT_WRITE, MAP_SHARED,
>> +			pmsg->fds[idx],
>> +			0);
> Just another ugly way:
> We can use the size of file to mmap then unmmap is not need align to the size of page.
>
Yes, this is like how cuses handle mmap.
We will add this into the to-do list, combine all the regions the first,
check if they belong to the same file, and then map each file once.
Seems there is no elegant way.

There is another to do for mmap. If there are multiple virtio devices,
the memory are mapped for each virtio device. Actually we only need once.