From: sashiko-bot@kernel.org
To: "Zack Rusin" <zack.rusin@broadcom.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Petr Mladek" <pmladek@suse.com>,
"Baoquan He" <baoquan.he@linux.dev>,
"Mike Rapoport" <rppt@kernel.org>,
"Pasha Tatashin" <pasha.tatashin@soleen.com>,
"Pratyush Yadav" <pratyush@kernel.org>,
"Dave Young" <ruirui.yang@linux.dev>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Kees Cook <kees@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Stephen Brennan <stephen.s.brennan@oracle.com>,
Bo Gan <bo.gan@broadcom.com>, "H. Peter Anvin" <hpa@zytor.com>,
Jonathan Corbet <corbet@lwn.net>,
Brennan Lamoreaux <brennan.lamoreaux@broadcom.com>,
x86@kernel.org, Joel Granados <joel.granados@kernel.org>,
Alexey Makhalov <alexey.makhalov@broadcom.com>,
Eugenio Perez <eperezma@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
bcm-kernel-feedback-list@broadcom.com,
Ajay Kaher <ajay.kaher@broadcom.com>,
Bradley Morgan <brads@mainlining.org>,
John Ogness <john.ogness@linutronix.de>,
virtualization@lists.linux.dev,
Steven Rostedt <rostedt@goodmis.org>,
Maaz Mombasawala <maaz.mombasawala@broadcom.com>,
Borislav Petkov <bp@alien8.de>,
Shuah Khan <skhan@linuxfoundation.org>,
Michael Kelley <mhklinux@outlook.com>,
Randy Dunlap <rdunlap@infradead.org>,
kexec@lists.infradead.org, Ian Forbes <ian.forbes@broadcom.com>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Thomas Gleixner <tglx@kernel.org>
Subject: Re: [PATCH v3 4/4] x86/vmware: Report guest crashes after kmsg dumpers
Date: Mon, 09 Nov 2026 05:52:33 +0000 [thread overview]
Message-ID: <sashiko-outbox-204461@kernel.org> (raw)
In-Reply-To: <4dc02120a69e0d4b21f1ea3a12b4aedf6f22e706.1794201807.git.zack.rusin@broadcom.com>
> VMware accepts a structured guest-crash event, but a host configured with
> backdoor.coredumpOnCrash may terminate the VM before the hypercall
> returns. Keep this event separate from the log sender, which runs
> earlier in panic.
>
> Register a panic-only kmsg dumper with late_initcall_sync(), after built-in
> dumpers registered by then. Skip the event while a crash kernel is loaded
> so the host cannot terminate the guest before kdump saves its vmcore.
>
> Issue the event at most once. With CONFIG_PRINTK=n, use a late INT_MIN
> panic notifier. An unexpected dumper registration failure with printk
> enabled leaves reporting disabled rather than overtaking working dumpers.
>
> Link: https://lore.kernel.org/r/20260309235250.2611115-4-alexey.makhalov@broadcom.com
> Co-developed-by: Brennan Lamoreaux <brennan.lamoreaux@broadcom.com>
> Signed-off-by: Brennan Lamoreaux <brennan.lamoreaux@broadcom.com>
> Co-developed-by: Alexey Makhalov <alexey.makhalov@broadcom.com>
> Signed-off-by: Alexey Makhalov <alexey.makhalov@broadcom.com>
> Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/cover.1794201807.git.zack.rusin@broadcom.com?part=4
WARNING: multiple messages have this Message-ID (diff)
From: sashiko-bot@kernel.org
To: "Zack Rusin" <zack.rusin@broadcom.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Petr Mladek" <pmladek@suse.com>,
"Baoquan He" <baoquan.he@linux.dev>,
"Mike Rapoport" <rppt@kernel.org>,
"Pasha Tatashin" <pasha.tatashin@soleen.com>,
"Pratyush Yadav" <pratyush@kernel.org>,
"Dave Young" <ruirui.yang@linux.dev>
Cc: "Borislav Petkov" <bp@alien8.de>,
"Ajay Kaher" <ajay.kaher@broadcom.com>,
"Alexey Makhalov" <alexey.makhalov@broadcom.com>,
x86@kernel.org, "Joel Granados" <joel.granados@kernel.org>,
"Thomas Gleixner" <tglx@kernel.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
virtualization@lists.linux.dev,
bcm-kernel-feedback-list@broadcom.com,
"John Ogness" <john.ogness@linutronix.de>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Sergey Senozhatsky" <senozhatsky@chromium.org>,
"Kees Cook" <kees@kernel.org>, "Jonathan Corbet" <corbet@lwn.net>,
"Bo Gan" <bo.gan@broadcom.com>,
"Brennan Lamoreaux" <brennan.lamoreaux@broadcom.com>,
kexec@lists.infradead.org,
"Guilherme G. Piccoli" <gpiccoli@igalia.com>,
"Maaz Mombasawala" <maaz.mombasawala@broadcom.com>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Stephen Brennan" <stephen.s.brennan@oracle.com>,
"Michael Kelley" <mhklinux@outlook.com>,
"Ian Forbes" <ian.forbes@broadcom.com>,
"Bradley Morgan" <brads@mainlining.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Eugenio Perez" <eperezma@redhat.com>
Subject: Re: [PATCH v3 4/4] x86/vmware: Report guest crashes after kmsg dumpers
Date: Mon, 09 Nov 2026 05:52:33 +0000 [thread overview]
Message-ID: <sashiko-outbox-204461@kernel.org> (raw)
In-Reply-To: <4dc02120a69e0d4b21f1ea3a12b4aedf6f22e706.1794201807.git.zack.rusin@broadcom.com>
> VMware accepts a structured guest-crash event, but a host configured with
> backdoor.coredumpOnCrash may terminate the VM before the hypercall
> returns. Keep this event separate from the log sender, which runs
> earlier in panic.
>
> Register a panic-only kmsg dumper with late_initcall_sync(), after built-in
> dumpers registered by then. Skip the event while a crash kernel is loaded
> so the host cannot terminate the guest before kdump saves its vmcore.
>
> Issue the event at most once. With CONFIG_PRINTK=n, use a late INT_MIN
> panic notifier. An unexpected dumper registration failure with printk
> enabled leaves reporting disabled rather than overtaking working dumpers.
>
> Link: https://lore.kernel.org/r/20260309235250.2611115-4-alexey.makhalov@broadcom.com
> Co-developed-by: Brennan Lamoreaux <brennan.lamoreaux@broadcom.com>
> Signed-off-by: Brennan Lamoreaux <brennan.lamoreaux@broadcom.com>
> Co-developed-by: Alexey Makhalov <alexey.makhalov@broadcom.com>
> Signed-off-by: Alexey Makhalov <alexey.makhalov@broadcom.com>
> Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/cover.1794201807.git.zack.rusin@broadcom.com?part=4
next prev parent reply other threads:[~2026-11-09 5:52 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-09 5:47 [PATCH v3 0/4] panic, x86/vmware: Preserve crash logs before kdump Zack Rusin
2026-11-09 5:47 ` Zack Rusin
2026-11-09 5:47 ` [PATCH v3 1/4] panic: Add a platform panic notifier list Zack Rusin
2026-11-09 5:47 ` Zack Rusin
2026-11-09 5:58 ` sashiko-bot
2026-11-09 5:58 ` sashiko-bot
2026-11-09 5:47 ` [PATCH v3 2/4] x86/vmware: Add a bounded panic log sender Zack Rusin
2026-11-09 5:47 ` Zack Rusin
2026-11-09 5:57 ` sashiko-bot
2026-11-09 5:57 ` sashiko-bot
2026-11-09 5:47 ` [PATCH v3 3/4] x86/vmware: Add the vmware_record_panic_msg sysctl Zack Rusin
2026-11-09 5:47 ` Zack Rusin
2026-11-09 5:55 ` sashiko-bot
2026-11-09 5:55 ` sashiko-bot
2026-11-09 5:47 ` [PATCH v3 4/4] x86/vmware: Report guest crashes after kmsg dumpers Zack Rusin
2026-11-09 5:47 ` Zack Rusin
2026-11-09 5:52 ` sashiko-bot [this message]
2026-11-09 5:52 ` sashiko-bot
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