linux-kernel - [PATCH] powerpc/fadump, x86/sev: Inform about unconditionally enabling crash_kexec_post

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Message-ID: <20240830141752.460173-1-gpiccoli@igalia.com>
Date: Fri, 30 Aug 2024 11:17:15 -0300
From: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To: kexec@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	x86@...nel.org
Cc: bhe@...hat.com,
	vgoyal@...hat.com,
	dyoung@...hat.com,
	mpe@...erman.id.au,
	npiggin@...il.com,
	christophe.leroy@...roup.eu,
	naveen@...nel.org,
	hbathini@...ux.ibm.com,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	hpa@...or.com,
	ashish.kalra@....com,
	michael.roth@....com,
	brijesh.singh@....com,
	thomas.lendacky@....com,
	linux-kernel@...r.kernel.org,
	linux-debuggers@...r.kernel.org,
	stephen.s.brennan@...cle.com,
	kernel@...ccoli.net,
	kernel-dev@...lia.com,
	"Guilherme G. Piccoli" <gpiccoli@...lia.com>
Subject: [PATCH] powerpc/fadump, x86/sev: Inform about unconditionally enabling crash_kexec_post_notifiers

Inspired by commit d57d6fe5bf34 ("drivers: hv: log when enabling crash_kexec_post_notifiers"),
a good idea is to signal on dmesg about unconditionally enabling the kernel
parameter crash_kexec_post_notifiers, which affects how kdump works.

By checking the source code, found 2 more cases besides Hyper-V, so let's
print that on dmesg for them as well.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
---
 arch/powerpc/kernel/fadump.c | 1 +
 arch/x86/virt/svm/sev.c      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index a612e7513a4f..37dee89a0bf2 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -1819,6 +1819,7 @@ int __init setup_fadump(void)
 	 * notifiers are invoked.
 	 */
 	crash_kexec_post_notifiers = true;
+	pr_info("PPC/fadump: enabling crash_kexec_post_notifiers\n");
 
 	return 1;
 }
diff --git a/arch/x86/virt/svm/sev.c b/arch/x86/virt/svm/sev.c
index 0ce17766c0e5..ac445ad2fcc8 100644
--- a/arch/x86/virt/svm/sev.c
+++ b/arch/x86/virt/svm/sev.c
@@ -257,6 +257,7 @@ static int __init snp_rmptable_init(void)
 	 * notifier is invoked to do SNP IOMMU shutdown before kdump.
 	 */
 	crash_kexec_post_notifiers = true;
+	pr_info("AMD/SEV: enabling crash_kexec_post_notifiers\n");
 
 	return 0;
 
-- 
2.46.0