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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-14 21:58:04 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-14 21:58:04 +0300 |
| commit | 8632e9b5645bbc2331d21d892b0d6961c1a08429 (patch) | |
| tree | df3fbdae9311a15b7c36da9db915e6b0a5f53ddc /arch/x86 | |
| parent | 6cc9306b8fc03019e81e4f10c93ff0528cba5217 (diff) | |
| parent | f3a99e761efa616028b255b4de58e9b5b87c5545 (diff) | |
| download | linux-8632e9b5645bbc2331d21d892b0d6961c1a08429.tar.xz | |
Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fixes from Wei Liu:
- a series from Tianyu Lan to fix crash reporting on Hyper-V
- three miscellaneous cleanup patches
* tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
x86/Hyper-V: Report crash data in die() when panic_on_oops is set
x86/Hyper-V: Report crash register data when sysctl_record_panic_msg is not set
x86/Hyper-V: Report crash register data or kmsg before running crash kernel
x86/Hyper-V: Trigger crash enlightenment only once during system crash.
x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump
x86/Hyper-V: Unload vmbus channel in hv panic callback
x86: hyperv: report value of misc_features
hv_debugfs: Make hv_debug_root static
hv: hyperv_vmbus.h: Replace zero-length array with flexible-array member
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 14 |
2 files changed, 17 insertions, 3 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index b0da5320bcff..624f5d9b0f79 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -20,6 +20,7 @@ #include <linux/mm.h> #include <linux/hyperv.h> #include <linux/slab.h> +#include <linux/kernel.h> #include <linux/cpuhotplug.h> #include <linux/syscore_ops.h> #include <clocksource/hyperv_timer.h> @@ -419,11 +420,14 @@ void hyperv_cleanup(void) } EXPORT_SYMBOL_GPL(hyperv_cleanup); -void hyperv_report_panic(struct pt_regs *regs, long err) +void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die) { static bool panic_reported; u64 guest_id; + if (in_die && !panic_on_oops) + return; + /* * We prefer to report panic on 'die' chain as we have proper * registers to report, but if we miss it (e.g. on BUG()) we need diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index caa032ce3fe3..ebf34c7bc8bc 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -227,8 +227,8 @@ static void __init ms_hyperv_init_platform(void) ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES); ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); - pr_info("Hyper-V: features 0x%x, hints 0x%x\n", - ms_hyperv.features, ms_hyperv.hints); + pr_info("Hyper-V: features 0x%x, hints 0x%x, misc 0x%x\n", + ms_hyperv.features, ms_hyperv.hints, ms_hyperv.misc_features); ms_hyperv.max_vp_index = cpuid_eax(HYPERV_CPUID_IMPLEMENT_LIMITS); ms_hyperv.max_lp_index = cpuid_ebx(HYPERV_CPUID_IMPLEMENT_LIMITS); @@ -263,6 +263,16 @@ static void __init ms_hyperv_init_platform(void) cpuid_eax(HYPERV_CPUID_NESTED_FEATURES); } + /* + * Hyper-V expects to get crash register data or kmsg when + * crash enlightment is available and system crashes. Set + * crash_kexec_post_notifiers to be true to make sure that + * calling crash enlightment interface before running kdump + * kernel. + */ + if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) + crash_kexec_post_notifiers = true; + #ifdef CONFIG_X86_LOCAL_APIC if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS && ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { |