linux-kernel - [RFC v1 6/8] crash hp: Add x86 crash hotplug state items to kimage

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Date:   Thu, 18 Nov 2021 12:49:46 -0500
From:   Eric DeVolder <eric.devolder@...cle.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, ebiederm@...ssion.com,
        dyoung@...hat.com, bhe@...hat.com, vgoyal@...hat.com
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        nramas@...ux.microsoft.com, thomas.lendacky@....com,
        robh@...nel.org, efault@....de, rppt@...nel.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
        eric.devolder@...cle.com
Subject: [RFC v1 6/8] crash hp: Add x86 crash hotplug state items to kimage

To facilitate hotplug updates of the crash elfcorehdr, a few members
are added to the kimage arch struct.

The indices of the elfcorehdr and purgatory segments are recorded
here so that upon a hotplug event, those segments can be efficiently
located and updated accordingly.

The purgatory image also requires a few register context values in
order to transition from purgatory to the next/capture kernel.

Signed-off-by: Eric DeVolder <eric.devolder@...cle.com>
---
 arch/x86/include/asm/kexec.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
index 11b7c06e2828..b08fe56239c8 100644
--- a/arch/x86/include/asm/kexec.h
+++ b/arch/x86/include/asm/kexec.h
@@ -150,6 +150,16 @@ struct kimage_arch {
 	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
+#ifdef CONFIG_CRASH_HOTPLUG
+	struct {
+		int elf_index;
+		int purg_index;
+		unsigned long rbx;
+		unsigned long rsi;
+		unsigned long rip;
+		unsigned long rsp;
+	} hp;
+#endif
 };
 #endif /* CONFIG_X86_32 */
 
-- 
2.27.0