Messages in this thread | | | Date | Fri, 8 Sep 2017 09:57:26 -0700 | From | Stephen Hemminger <> | Subject | Re: [PATCH] x86/idt: Unbreak MS HyperV hypercall vector install |
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On Fri, 8 Sep 2017 01:19:52 -0700 "Thomas Gleixner" <tglx@linutronix.de> 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 <sthemmin@microsoft.com> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This fixes it, thanks.
Tested-by: Stephen Hemminger <sthemmin@microsoft.com>
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