Re: [Xen-devel] [PATCH for-4.7] x86/pv: Correctly fold vIOPL back into vcpu_guest_context

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Apr 11, 2016 at 10:08:58AM -0400, Boris Ostrovsky wrote:
> On 04/11/2016 05:03 AM, Andrew Cooper wrote:
> >c/s f71ecb6 "x86: introduce a new VMASSIST for architectural behaviour of
> >iopl" shifted the vcpu iopl field by 12, but didn't update the logic which
> >reconstructs the guests eflags for migration.
> >
> >Existing guest kernels set a vIOPL of 1, to prevent them from faulting when
> >accessing IO ports.  This bug manifests as a crash after migrate, as the 
> >vIOPL
> >reverts back to the default of 0, and the guest suffers an unexpected #GP
> >fault.
> >
> >Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> 
> Tested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> 
> (save/restore was part of brokenness as well, obviously)

Applied.

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