From: ltykernel@gmail.com
To: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, liuwe@microsoft.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org,
michael.h.kelley@microsoft.com
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
vkuznets@redhat.com
Subject: [PATCH V3 4/6] x86/Hyper-V: Report crash register data or ksmg before running crash kernel
Date: Tue, 24 Mar 2020 00:57:18 -0700 [thread overview]
Message-ID: <20200324075720.9462-5-Tianyu.Lan@microsoft.com> (raw)
In-Reply-To: <20200324075720.9462-1-Tianyu.Lan@microsoft.com>
From: Tianyu Lan <Tianyu.Lan@microsoft.com>
We want to notify Hyper-V when a Linux guest VM crash occurs, so
there is a record of the crash even when kdump is enabled. But
crash_kexec_post_notifiers defaults to "false", so the kdump kernel
runs before the notifiers and Hyper-V never gets notified. Fix this by
always setting crash_kexec_post_notifiers to be true for Hyper-V VMs.
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
Change since v1:
Update commit log
---
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
next prev parent reply other threads:[~2020-03-24 7:57 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 7:57 [PATCH V3 0/6] x86/Hyper-V: Panic code path fixes ltykernel
2020-03-24 7:57 ` [PATCH V3 1/6] x86/Hyper-V: Unload vmbus channel in hv panic callback ltykernel
2020-03-25 18:28 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 2/6] x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump ltykernel
2020-03-25 18:30 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 3/6] x86/Hyper-V: Trigger crash enlightenment only once during system crash ltykernel
2020-03-25 18:31 ` Michael Kelley
2020-03-24 7:57 ` ltykernel [this message]
2020-03-25 18:33 ` [PATCH V3 4/6] x86/Hyper-V: Report crash register data or ksmg before running crash kernel Michael Kelley
2020-03-24 7:57 ` [PATCH V3 5/6] x86/Hyper-V: Report crash register data when sysctl_record_panic_msg is not set ltykernel
2020-03-25 18:34 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 6/6] x86/Hyper-V: Report crash data in die() when panic_on_oops is set ltykernel
2020-03-25 18:36 ` Michael Kelley
2020-03-31 7:38 ` [PATCH V4 " ltykernel
2020-03-31 13:51 ` Michael Kelley
2020-03-31 14:26 ` Tianyu Lan
2020-04-01 18:53 ` Wei Liu
2020-04-02 12:51 ` Tianyu Lan
2020-03-30 10:13 ` [PATCH V3 0/6] x86/Hyper-V: Panic code path fixes Wei Liu
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