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SubjectRe: [PATCH] x86/idt: Unbreak MS HyperV hypercall vector install
On Fri, 8 Sep 2017 01:19:52 -0700
"Thomas Gleixner" <> wrote:

> The rework of the IDT setup changed the way how unused system gates are
> accounted. At the end of the gate initialization all unused gates in the
> system vector area are set to the spurios handler and marked as used for
> consistency reasons.
> Marking them as used breaks MS HyperV because it installs its hypercall
> vector after that point and the installation is guarded by the bit in the
> used_vectors map. So the hyperv vector stays directed to the spurious
> interrupt handler.
> Leave them marked as unused again and unbreak HyperV that way.
> Fixes: dc20b2d52653 ("x86/idt: Move interrupt gate initialization to IDT
> code")
> Reported-by: Stephen Hemminger <>
> Signed-off-by: Thomas Gleixner <>

This fixes it, thanks.

Tested-by: Stephen Hemminger <>

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