On Wed, Sep 17, 2014 at 05:39:04PM +0800, Linhaifeng wrote: > I think maybe is not need for the backend to wait for response. > > There is another way.vhost-user send "VHOST_GET_MEM_TABLE" to qemu then qemu > send VHOST_SET_MEM_TABLE to update the regions of vhost-user.same as other > command. > If qemu could response the request of the vhost-user.the vhost-user could > update date at anytime.
The updates are initiated by QEMU, as a result of IOMMU, memory hotplug or some other configuration change. > I think it's very useful for Commercialization. > > On 2014/9/17 16:38, Michael S. Tsirkin wrote: > > Reply-To: > > > > Thinking about the vhost-user protocol, VHOST_SET_MEM_TABLE > > is used to update the memory mappings. > > > > So shouldn't we want for response? > > Otherwise e.g. guest can start using the memory > > that vhost-user can't access. > > > > Similarly, with an IOMMU vhost-user might access memory it shouldn't. > > > > VHOST_SET_VRING_CALL is used for MSI-X masking. > > Again, after vector is masted by switching the call fd, > > backend shouldn't assert the old one. > > > > Thoughts? > > > >
