> -----Original Message-----
> From: Sunil Muthuswamy
> Sent: Monday, June 11, 2018 10:44 AM
> To: KY Srinivasan <kys@xxxxxxxxxxxxx>; Haiyang Zhang
> <haiyangz@xxxxxxxxxxxxx>
> Cc: devel@xxxxxxxxxxxxxxxxxxxxxx; Stephen Hemminger
> <sthemmin@xxxxxxxxxxxxx>
> Subject: RE: [PATCH v5] Drivers: HV: Send one page worth of kmsg dump
> over Hyper-V during panic
>
>
>
> > -----Original Message-----
> > From: KY Srinivasan
> > Sent: Sunday, June 10, 2018 2:54 PM
> > To: Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx>; Haiyang Zhang
> > <haiyangz@xxxxxxxxxxxxx>
> > Cc: devel@xxxxxxxxxxxxxxxxxxxxxx; Stephen Hemminger
> > <sthemmin@xxxxxxxxxxxxx>
> > Subject: RE: [PATCH v5] Drivers: HV: Send one page worth of kmsg dump
> > over Hyper-V during panic
> >
> >
> >
> > > -----Original Message-----
> > > From: Sunil Muthuswamy
> > > Sent: Friday, June 8, 2018 11:39 AM
> > > To: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> > > Cc: devel@xxxxxxxxxxxxxxxxxxxxxx; Sunil Muthuswamy
> > > <sunilmut@xxxxxxxxxxxxx>; KY Srinivasan <kys@xxxxxxxxxxxxx>;
> Stephen
> > > Hemminger <sthemmin@xxxxxxxxxxxxx>
> > > Subject: [PATCH v5] Drivers: HV: Send one page worth of kmsg dump
> over
> > > Hyper-V during panic
> > >
> > > In the VM mode on Hyper-V, currently, when the kernel panics, an error
> > > code and few register values are populated in an MSR and the Hypervisor
> > > notified. This information is collected on the host. The amount of
> > > information currently collected is found to be limited and not very
> > > actionable. To gather more actionable data, such as stack trace, the
> > > proposal is to write one page worth of kmsg data on an allocated page
> > > and the Hypervisor notified of the page address through the MSR.
> > >
Snip.
> > > /*
> > > * vmbus_bus_init -Main vmbus driver initialization routine.
> > > @@ -1065,6 +1136,38 @@ static int vmbus_bus_init(void)
> > > * Only register if the crash MSRs are available
> > > */
> > > if (ms_hyperv.misc_features &
> > > HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
> > > + u64 hyperv_crash_ctl;
> > > + if (!hv_ctl_table_hdr) {
> > When vmus_bus_init is invoked, would hv_ctl_table_hdr ever be
> > Non-NULL?
Ping.
Snip.
Regards,
K. Y
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