Re: [dpdk-dev] [PATCH RFC v2 08/12] lib/librte_vhost: vhost-user support

[Linhaifeng <haifeng.lin@huawei.com>]

On 2014/12/12 1:13, Xie, Huawei wrote:
>>
>> Only support one vhost-user port ?
> 
> Do you mean vhost server by "port"?
> If that is the case, yes, now only one vhost server is supported for multiple virtio devices.
> As stated in the cover letter, we have requirement and plan for multiple server support,
> though I am not sure if it is absolutely necessary.
> 
I think if you also want to suport client mode (qemu as server) is necessary to implement multiple server.

>>
>> Can you mmap the region if gpa is 0? When i run VM with two numa node (qemu
>> will create two hugepage file) found that always failed to mmap with the region
>> which gpa is 0.
> 
> Current implementation doesn't assume there is only one huge page file to back the guest memory.
> It maps every region using the fd of that region. 
> Could you please paste your guest VM command line here?
> 
>>
>> BTW can we ensure the memory regions cover with all the memory of hugepage
>> for VM?
> 
> I think so, because virtio devices could use any normal guest memory, but we needn't ensure that.
> We only need to map the region passed to us from qemu vhost, which should be enough to translate
> the GPA in vring from virtio in guest, otherwise it is the bug of qemu vhost.
> 
> 

-- 
Regards,
Haifeng