Messages in this thread | | | Date | Fri, 8 Sep 2017 19:09:18 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH] x86/idt: Unbreak MS HyperV hypercall vector install |
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On Fri, 8 Sep 2017, Stephen Hemminger wrote: > 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>
What's the reason that the vector is not set up early in the boot process?
Thanks,
tglx
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