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Date: Sat, 26 May 2018 15:22:26 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Mike Haboustak <haboustak@gmail.com>
Cc: stable@vger.kernel.org
Subject: Re: Please include d391f120706726826 in v4.9.y [x86/kvm/vmx]: do not
 use vm-exit instruction length for fast MMIO when running nested
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On Fri, May 25, 2018 at 09:03:07AM -0400, Mike Haboustak wrote:
> The following commit fixes freezes in virtio device drivers when KVM
> is nested under
> VMWare Workstation/ESXi or Hyper-V. I've encountered problems running KVM
> inside VMWare since upgrading to Debian 9 (currently testing 4.9.88-1+deb9u1).
> 
> d391f1207067268261add0485f0f34503539c5b0
> 
> The same issue affects 4.4.y as well.  A git-bisect within my
> environment stopped at
> e9ea5069d9e569c32ab913c39467df32e056b3a7, where the KVM capability was added
> that QEMU checks before enabling fast mmio.

The patch does not apply to 4.9.y or 4.4.y, can you please provide a
working backport?  I will be glad to queue it up then.

thanks,

greg k-h