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x86/Hyper-V: Report crash data in die() when panic_on_oops is set

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commit f3a99e761efa616028b255b4de58e9b5b87c5545 upstream.

When oops happens with panic_on_oops unset, the oops
thread is killed by die() and system continues to run.
In such case, guest should not report crash register
data to host since system still runs. Check panic_on_oops
and return directly in hyperv_report_panic() when the function
is called in the die() and panic_on_oops is unset. Fix it.

Fixes: 7ed4325a44 ("Drivers: hv: vmbus: Make panic reporting to be more useful")
Signed-off-by: Tianyu Lan <[email protected]>
Reviewed-by: Michael Kelley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Wei Liu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Tianyu Lan 2020-04-06 08:53:31 -07:00 • committed by Greg Kroah-Hartman
commit 4f7b1e892e
3 changed files with 9 additions and 4 deletions
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5
drivers/hv/vmbus_drv.c
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@ -31,6 +31,7 @@
#include <linux/kdebug.h>
#include <linux/efi.h>
#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/syscore_ops.h>
#include <clocksource/hyperv_timer.h>
#include "hyperv_vmbus.h"
@ -75,7 +76,7 @@ static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE
&& hyperv_report_reg()) {
regs = current_pt_regs();
hyperv_report_panic(regs, val);
hyperv_report_panic(regs, val, false);
}
return NOTIFY_DONE;
}
@ -92,7 +93,7 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
* the notification here.
*/
if (hyperv_report_reg())
hyperv_report_panic(regs, val);
hyperv_report_panic(regs, val, true);
return NOTIFY_DONE;
}