Message ID | 20231222193607.15474-7-graf@amazon.com |
---|---|
State | New |
Headers |
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Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, "Rob Herring" <robh+dt@kernel.org>, Steven Rostedt <rostedt@goodmis.org>, "Andrew Morton" <akpm@linux-foundation.org>, Mark Rutland <mark.rutland@arm.com>, "Tom Lendacky" <thomas.lendacky@amd.com>, Ashish Kalra <ashish.kalra@amd.com>, James Gowans <jgowans@amazon.com>, Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>, <arnd@arndb.de>, <pbonzini@redhat.com>, <madvenka@linux.microsoft.com>, Anthony Yznaga <anthony.yznaga@oracle.com>, Usama Arif <usama.arif@bytedance.com>, David Woodhouse <dwmw@amazon.co.uk>, Benjamin Herrenschmidt <benh@kernel.crashing.org> Subject: [PATCH v2 06/17] kexec: Add config option for KHO Date: Fri, 22 Dec 2023 19:35:56 +0000 Message-ID: <20231222193607.15474-7-graf@amazon.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231222193607.15474-1-graf@amazon.com> References: <20231222193607.15474-1-graf@amazon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: <linux-kernel.vger.kernel.org> List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org> MIME-Version: 1.0 X-ClientProxiedBy: EX19D037UWB001.ant.amazon.com (10.13.138.123) To EX19D020UWC004.ant.amazon.com (10.13.138.149) Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786012142441176587 X-GMAIL-MSGID: 1786012142441176587 |
Series |
kexec: Allow preservation of ftrace buffers
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|
Commit Message
Alexander Graf
Dec. 22, 2023, 7:35 p.m. UTC
We have all generic code in place now to support Kexec with KHO. This
patch adds a config option that depends on architecture support to
enable KHO support.
Signed-off-by: Alexander Graf <graf@amazon.com>
---
kernel/Kconfig.kexec | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec index 2fd510256604..909ab28f1341 100644 --- a/kernel/Kconfig.kexec +++ b/kernel/Kconfig.kexec @@ -91,6 +91,19 @@ config KEXEC_JUMP Jump between original kernel and kexeced kernel and invoke code in physical address mode via KEXEC +config KEXEC_KHO + bool "kexec handover" + depends on ARCH_SUPPORTS_KEXEC_KHO + depends on KEXEC + select MEMBLOCK_SCRATCH + select LIBFDT + select CMA + help + Allow kexec to hand over state across kernels by generating and + passing additional metadata to the target kernel. This is useful + to keep data or state alive across the kexec. For this to work, + both source and target kernels need to have this option enabled. + config CRASH_DUMP bool "kernel crash dumps" depends on ARCH_SUPPORTS_CRASH_DUMP