linux-kernel - [PATCH v16 04/11] x86: kdump: move xen_pv_domain() check and insert_resource() to setup

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Message-ID: <20211123124646.1995-5-thunder.leizhen@huawei.com>
Date:   Tue, 23 Nov 2021 20:46:39 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
        <linux-kernel@...r.kernel.org>, Dave Young <dyoung@...hat.com>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        <kexec@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        <devicetree@...r.kernel.org>, Jonathan Corbet <corbet@....net>,
        <linux-doc@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>
Subject: [PATCH v16 04/11] x86: kdump: move xen_pv_domain() check and insert_resource() to setup_arch()

From: Chen Zhou <chenzhou10@...wei.com>

We will make the functions reserve_crashkernel() as generic, the
xen_pv_domain() check in reserve_crashkernel() is relevant only to
x86, the same as insert_resource() in reserve_crashkernel[_low]().
So move xen_pv_domain() check and insert_resource() to setup_arch()
to keep them in x86.

Suggested-by: Mike Rapoport <rppt@...nel.org>
Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
Tested-by: John Donnelly <John.p.donnelly@...cle.com>
Acked-by: Baoquan He <bhe@...hat.com>
---
 arch/x86/kernel/setup.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 2330dcb83e8f06a..63ed089f9778fc3 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -456,7 +456,6 @@ static int __init reserve_crashkernel_low(void)
 
 	crashk_low_res.start = low_base;
 	crashk_low_res.end   = low_base + low_size - 1;
-	insert_resource(&iomem_resource, &crashk_low_res);
 #endif
 	return 0;
 }
@@ -480,11 +479,6 @@ static void __init reserve_crashkernel(void)
 		high = true;
 	}
 
-	if (xen_pv_domain()) {
-		pr_info("Ignoring crashkernel for a Xen PV domain\n");
-		return;
-	}
-
 	/* 0 means: find the address automatically */
 	if (!crash_base) {
 		/*
@@ -531,7 +525,6 @@ static void __init reserve_crashkernel(void)
 
 	crashk_res.start = crash_base;
 	crashk_res.end   = crash_base + crash_size - 1;
-	insert_resource(&iomem_resource, &crashk_res);
 }
 #else
 static void __init reserve_crashkernel(void)
@@ -1143,7 +1136,17 @@ void __init setup_arch(char **cmdline_p)
 	 * Reserve memory for crash kernel after SRAT is parsed so that it
 	 * won't consume hotpluggable memory.
 	 */
-	reserve_crashkernel();
+	if (xen_pv_domain())
+		pr_info("Ignoring crashkernel for a Xen PV domain\n");
+	else {
+		reserve_crashkernel();
+#ifdef CONFIG_KEXEC_CORE
+		if (crashk_res.end > crashk_res.start)
+			insert_resource(&iomem_resource, &crashk_res);
+		if (crashk_low_res.end > crashk_low_res.start)
+			insert_resource(&iomem_resource, &crashk_low_res);
+#endif
+	}
 
 	memblock_find_dma_reserve();
 
-- 
2.25.1