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Date: Tue, 17 Mar 2020 06:25:23 -0700 From: ltykernel@...il.com To: kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com, liuwe@...rosoft.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org, michael.h.kelley@...rosoft.com Cc: Tianyu Lan <Tianyu.Lan@...rosoft.com>, linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org, vkuznets@...hat.com Subject: [PATCH 4/4] x86/Hyper-V: Report crash register data or ksmg before running crash kernel From: Tianyu Lan <Tianyu.Lan@...rosoft.com> Hyper-V expects to get crash register data or kmsg via crash enlightenment when guest crash happens. crash_kexec_post_notifiers is default to be false and crash kernel runs before calling hv panic callback and dumping kmsg. In this case, Hyper-V doesn't get crash register data or kmsg from guest. Set crash_kexec_post _notifiers to be true for Hyper-V VM and fix it. Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com> --- arch/x86/kernel/cpu/mshyperv.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index caa032ce3fe3..5e296a7e6036 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -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) { -- 2.14.5
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