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| author | Sunil Muthuswamy <sunilmut@microsoft.com> | 2018-07-08 02:56:51 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-08 15:54:31 +0200 |
| commit | 81b18bce48af3e222ca9eebb3b931f59141b7b49 (patch) | |
| tree | 6b54ead39883ffb38b2665882a5a7ebdfe8086f6 /arch/x86/include/asm/hyperv-tlfs.h | |
| parent | e464d28273f895bfc57bfec2beb8a894eb45237c (diff) | |
| download | linux-0-day-81b18bce48af3e222ca9eebb3b931f59141b7b49.tar.gz linux-0-day-81b18bce48af3e222ca9eebb3b931f59141b7b49.tar.xz | |
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.
- Sysctl option to control the behavior, with ON by default.
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/include/asm/hyperv-tlfs.h')
| -rw-r--r-- | arch/x86/include/asm/hyperv-tlfs.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 96272e99b64e1..6ced78af48da6 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -176,9 +176,10 @@ #define HV_X64_ENLIGHTENED_VMCS_RECOMMENDED (1 << 14) /* - * Crash notification flag. + * Crash notification flags. */ -#define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63) +#define HV_CRASH_CTL_CRASH_NOTIFY_MSG BIT_ULL(62) +#define HV_CRASH_CTL_CRASH_NOTIFY BIT_ULL(63) /* MSR used to identify the guest OS. */ #define HV_X64_MSR_GUEST_OS_ID 0x40000000 |