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SubjectRE: [PATCH 1/1] x86/hyper-V: Allocate the IDT entry early in boot
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> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@linutronix.de]
> Sent: Saturday, September 9, 2017 2:40 AM
> To: KY Srinivasan <kys@microsoft.com>
> Cc: x86@kernel.org; gregkh@linuxfoundation.org; linux-
> kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com; hpa@zytor.com;
> mingo@kernel.org
> Subject: Re: [PATCH 1/1] x86/hyper-V: Allocate the IDT entry early in boot
>
> On Fri, 8 Sep 2017, K. Y. Srinivasan wrote:
>
> > Allocate the hypervisor callback IDT entry early in the boot sequence.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> > ---
> > arch/x86/kernel/cpu/mshyperv.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/x86/kernel/cpu/mshyperv.c
> b/arch/x86/kernel/cpu/mshyperv.c
> > index 3b3f713e15e5..236324e83a3a 100644
> > --- a/arch/x86/kernel/cpu/mshyperv.c
> > +++ b/arch/x86/kernel/cpu/mshyperv.c
> > @@ -59,8 +59,6 @@ void hyperv_vector_handler(struct pt_regs *regs)
> > void hv_setup_vmbus_irq(void (*handler)(void))
> > {
> > vmbus_handler = handler;
> > - /* Setup the IDT for hypervisor callback */
> > - alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
> hyperv_callback_vector);
> > }
> >
> > void hv_remove_vmbus_irq(void)
> > @@ -251,6 +249,8 @@ static void __init ms_hyperv_init_platform(void)
> > */
> > x86_platform.apic_post_init = hyperv_init;
> > hyperv_setup_mmu_ops();
> > + /* Setup the IDT for hypervisor callback */
> > + alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
> hyperv_callback_vector);
> > #endif
> > }
>
> Nice. So we can make all of that gate/idt stuff __init now.
>
> That makes my previous fix obsolete, right?

Yes.

K. Y
>
> Thanks,
>
> tglx
>

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