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Date: Mon, 8 Jul 2019 17:15:28 -0400
From: Pavel Tatashin <pasha.tatashin@...een.com>
To: pasha.tatashin@...een.com, jmorris@...ei.org, sashal@...nel.org,
ebiederm@...ssion.com, kexec@...ts.infradead.org,
linux-kernel@...r.kernel.org, corbet@....net,
catalin.marinas@....com, will@...nel.org,
linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [v1 5/5] arm64, kexec: reserve kexeckernel region
kexeckernel= is used to reserve memory for normal kexec kernel for
faster reboot.
Rename reserve_crashkernel() to reserve_crash_or_kexec_kernel(), and
generalize it by adding an argument that specifies what is reserved:
"crashkernel=" for crash kernel region
"kexeckernel=" for normal kexec region
Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
---
.../admin-guide/kernel-parameters.txt | 10 +--
arch/arm64/kernel/setup.c | 5 ++
arch/arm64/mm/init.c | 83 ++++++++++++-------
3 files changed, 63 insertions(+), 35 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 0f5ce665c7f5..a18222c1fbee 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -740,11 +740,11 @@
or memory reserved is below 4G.
kexeckernel=size[KMG][@offset[KMG]]
- [KNL] Using kexec, Linux can reboot to a new kernel.
- This parameter reserves the physical memory region
- [offset, offset + size] for that kernel. If '@...set' is
- omitted, then a suitable offset is selected
- automatically.
+ [KNL, ARM64] Using kexec, Linux can reboot to a new
+ kernel. This parameter reserves the physical memory
+ region [offset, offset + size] for that kernel. If
+ '@...set' is omitted, then a suitable offset is
+ selected automatically.
cryptomgr.notests
[KNL] Disable crypto self-tests
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 7e541f947b4c..9f308fa103c5 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -235,6 +235,11 @@ static void __init request_standard_resources(void)
if (crashk_res.end && crashk_res.start >= res->start &&
crashk_res.end <= res->end)
request_resource(res, &crashk_res);
+
+ /* Userspace will find "Kexec kernel" region in /proc/iomem. */
+ if (kexeck_res.end && kexeck_res.start >= res->start &&
+ kexeck_res.end <= res->end)
+ request_resource(res, &kexeck_res);
#endif
}
}
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f3c795278def..dfef39f72faf 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -54,61 +54,83 @@ phys_addr_t arm64_dma_phys_limit __ro_after_init;
#ifdef CONFIG_KEXEC_CORE
/*
- * reserve_crashkernel() - reserves memory for crash kernel
+ * reserve_crash_or_kexec_kernel() - reserves memory for crash kernel or
+ * for normal kexec kernel.
*
- * This function reserves memory area given in "crashkernel=" kernel command
- * line parameter. The memory reserved is used by dump capture kernel when
- * primary kernel is crashing.
+ * This function reserves memory area given in "crashkernel=" or "kexeckenel="
+ * kernel command line parameter. The memory reserved is used by dump capture
+ * kernel when primary kernel is crashing, or to load new kexec kernel for
+ * faster reboot without relocation.
*/
-static void __init reserve_crashkernel(void)
+static void __init reserve_crash_or_kexec_kernel(char *cmd)
{
- unsigned long long crash_base, crash_size;
+ unsigned long long base, size;
+ struct resource *res;
+ char s[16];
int ret;
- ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
- &crash_size, &crash_base);
- /* no crashkernel= or invalid value specified */
- if (ret || !crash_size)
+ /* cmd must be either: "crashkernel=" or "kexeckernel=" */
+ if (!strcmp(cmd, "crashkernel=")) {
+ res = &crashk_res;
+ } else if (!strcmp(cmd, "kexeckernel=")) {
+ res = &kexeck_res;
+ } else {
+ pr_err("%s: invalid cmd %s\n", __func__, cmd);
+ return;
+ }
+
+ /* remove trailing '=' for a nicer printfs */
+ strcpy(s, cmd);
+ s[strlen(s) - 1] = '\0';
+
+ ret = parse_crash_or_kexec_kernel(boot_command_line,
+ memblock_phys_mem_size(),
+ &size, &base, cmd, NULL);
+ /* no specified command or invalid value specified */
+ if (ret || !size)
return;
- crash_size = PAGE_ALIGN(crash_size);
+ size = PAGE_ALIGN(size);
- if (crash_base == 0) {
+ if (base == 0) {
/* Current arm64 boot protocol requires 2MB alignment */
- crash_base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT,
- crash_size, SZ_2M);
- if (crash_base == 0) {
- pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
- crash_size);
+ base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT,
+ size, SZ_2M);
+ if (base == 0) {
+ pr_warn("cannot allocate %s (size:0x%llx)\n",
+ s, size);
return;
}
} else {
/* User specifies base address explicitly. */
- if (!memblock_is_region_memory(crash_base, crash_size)) {
- pr_warn("cannot reserve crashkernel: region is not memory\n");
+ if (!memblock_is_region_memory(base, size)) {
+ pr_warn("cannot reserve %s: region is not memory\n",
+ s);
return;
}
- if (memblock_is_region_reserved(crash_base, crash_size)) {
- pr_warn("cannot reserve crashkernel: region overlaps reserved memory\n");
+ if (memblock_is_region_reserved(base, size)) {
+ pr_warn("cannot reserve %s: region overlaps reserved memory\n",
+ s);
return;
}
- if (!IS_ALIGNED(crash_base, SZ_2M)) {
- pr_warn("cannot reserve crashkernel: base address is not 2MB aligned\n");
+ if (!IS_ALIGNED(base, SZ_2M)) {
+ pr_warn("cannot reserve %s: base address is not 2MB aligned\n",
+ s);
return;
}
}
- memblock_reserve(crash_base, crash_size);
+ memblock_reserve(base, size);
- pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
- crash_base, crash_base + crash_size, crash_size >> 20);
+ pr_info("%s reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
+ s, base, base + size, size >> 20);
- crashk_res.start = crash_base;
- crashk_res.end = crash_base + crash_size - 1;
+ res->start = base;
+ res->end = base + size - 1;
}
#else
-static void __init reserve_crashkernel(void)
+static void __init reserve_crash_or_kexec_kernel(char *cmd)
{
}
#endif /* CONFIG_KEXEC_CORE */
@@ -411,7 +433,8 @@ void __init arm64_memblock_init(void)
else
arm64_dma_phys_limit = PHYS_MASK + 1;
- reserve_crashkernel();
+ reserve_crash_or_kexec_kernel("crashkernel=");
+ reserve_crash_or_kexec_kernel("kexeckernel=");
reserve_elfcorehdr();
--
2.22.0
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