Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm

[Michael S. Tsirkin]

On Mon, Oct 26, 2015 at 02:24:32PM +0100, Igor Mammedov wrote:
> Yep it's workaround but it works around QEMU's broken virtio
> implementation in a simple way without need for guest side changes.
> 
> Without foreseeable virtio fix it makes memory hotplug unusable and even
> more so if there were a virtio fix it won't fix old guests since you've
> said that virtio fix would require changes of both QEMU and guest sides.

What makes it not foreseeable?
Apparently only the fact that we have a work-around in place so no one
works on it.  I can code it up pretty quickly, but I'm flat out of time
for testing as I'm going on vacation soon, and hard freeze is pretty
close.

GPA space is kind of cheap, but wasting it in chunks of 512M
seems way too aggressive.


-- 
MST