diff options
| author | K. Y. Srinivasan <kys@microsoft.com> | 2017-10-29 11:33:41 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-31 13:40:29 +0100 |
| commit | 7ed4325a44ea5a683547d4ce62578f812938cf94 (patch) | |
| tree | 41ba328a2255acac2767ab013baf163fff0d74aa /arch/x86/hyperv/hv_init.c | |
| parent | 6981fbf3780366093858c5d2dcdaadcd1fbb04be (diff) | |
Drivers: hv: vmbus: Make panic reporting to be more useful
Hyper-V allows the guest to report panic and the guest can pass additional
information. All this is logged on the host. Currently Linux is passing back
information that is not particularly useful. Make the following changes:
1. Windows uses crash MSR P0 to report bugcheck code. Follow the same
convention for Linux as well.
2. It will be useful to know the gust ID of the Linux guest that has
paniced. Pass back this information.
These changes will help in better supporting Linux on Hyper-V
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/hyperv/hv_init.c')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index a5db63f728a2..aeb8edf32e2b 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -210,9 +210,10 @@ void hyperv_cleanup(void) } EXPORT_SYMBOL_GPL(hyperv_cleanup); -void hyperv_report_panic(struct pt_regs *regs) +void hyperv_report_panic(struct pt_regs *regs, long err) { static bool panic_reported; + u64 guest_id; /* * We prefer to report panic on 'die' chain as we have proper @@ -223,11 +224,13 @@ void hyperv_report_panic(struct pt_regs *regs) return; panic_reported = true; - wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip); - wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax); - wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx); - wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx); - wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx); + rdmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id); + + wrmsrl(HV_X64_MSR_CRASH_P0, err); + wrmsrl(HV_X64_MSR_CRASH_P1, guest_id); + wrmsrl(HV_X64_MSR_CRASH_P2, regs->ip); + wrmsrl(HV_X64_MSR_CRASH_P3, regs->ax); + wrmsrl(HV_X64_MSR_CRASH_P4, regs->sp); /* * Let Hyper-V know there is crash data available |