RE: [PATCH 1/1] x86/hyper-V: Allocate the IDT entry early in boot

[KY Srinivasan]

> -----Original Message-----
> From: Dan Carpenter [mailto:dan.carpenter@xxxxxxxxxx]
> Sent: Saturday, September 9, 2017 4:04 AM
> To: KY Srinivasan <kys@xxxxxxxxxxxxx>
> Cc: x86@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx;
> apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx; tglx@xxxxxxxxxxxxx;
> hpa@xxxxxxxxx; mingo@xxxxxxxxxx
> Subject: Re: [PATCH 1/1] x86/hyper-V: Allocate the IDT entry early in boot
> 
> On Fri, Sep 08, 2017 at 04:15:57PM -0700, kys@xxxxxxxxxxxxxxxxxxxxxx
> wrote:
> > From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
> >
> > Allocate the hypervisor callback IDT entry early in the boot sequence.
> >
> 
> I'm guessing this fixes a NULL dereference or something?  The changelog
> doesn't really say why we are doing this.

The changelog does say what we are doing - allocating the IDT entry early in the boot sequence.
The current code would allocate the entry as part of registering the handler when vmbus driver
loaded and this caused a problem for the cleanup Thomas had implemented.

K. Y
> 
> regards,
> dan carpenter