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x86/Hyper-V: Report crash register data when sysctl_record_panic_msg is not set 

When sysctl_record_panic_msg is not set, the panic will
not be reported to Hyper-V via hyperv_report_panic_msg().
So the crash should be reported via hyperv_report_panic().

Fixes: 81b18bce48 ("Drivers: HV: Send one page worth of kmsg dump over Hyper-V during panic")
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Link: https://lore.kernel.org/r/20200406155331.2105-6-Tianyu.Lan@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Tianyu Lan 2020-04-06 08:53:30 -07:00 committed by Wei Liu
parent a11589563e
commit 040026df70
1 changed files with 14 additions and 9 deletions
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23
drivers/hv/vmbus_drv.c
View File

@ -48,6 +48,18 @@ static int hyperv_cpuhp_online;
static void *hv_panic_page; static void *hv_panic_page;
/*
* Boolean to control whether to report panic messages over Hyper-V.
*
* It can be set via /proc/sys/kernel/hyperv/record_panic_msg
*/
static int sysctl_record_panic_msg = 1;
static int hyperv_report_reg(void)
{
return !sysctl_record_panic_msg || !hv_panic_page;
}
static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
void *args) void *args)
{ {
@ -61,7 +73,7 @@ static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
* the notification here. * the notification here.
*/ */
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE
&& !hv_panic_page) { && hyperv_report_reg()) {
regs = current_pt_regs(); regs = current_pt_regs();
hyperv_report_panic(regs, val); hyperv_report_panic(regs, val);
} }
@ -79,7 +91,7 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
* doing hyperv_report_panic_msg() later with kmsg data, don't do * doing hyperv_report_panic_msg() later with kmsg data, don't do
* the notification here. * the notification here.
*/ */
if (!hv_panic_page) if (hyperv_report_reg())
hyperv_report_panic(regs, val); hyperv_report_panic(regs, val);
return NOTIFY_DONE; return NOTIFY_DONE;
} }
@ -1267,13 +1279,6 @@ static void vmbus_isr(void)
add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
} }
/*
* Boolean to control whether to report panic messages over Hyper-V.
*
* It can be set via /proc/sys/kernel/hyperv/record_panic_msg
*/
static int sysctl_record_panic_msg = 1;
/* /*
* Callback from kmsg_dump. Grab as much as possible from the end of the kmsg * Callback from kmsg_dump. Grab as much as possible from the end of the kmsg
* buffer and call into Hyper-V to transfer the data. * buffer and call into Hyper-V to transfer the data.