Reserve memory for quick kexec on arm64 with cmdline "quickkexec=". Signed-off-by: Sang Yan <sangyan@xxxxxxxxxx> --- arch/arm64/kernel/setup.c | 6 ++++++ arch/arm64/mm/init.c | 43 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 77c4c9bad1b8..2a5dc032d95e 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -369,6 +369,12 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p) */ init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page); #endif +#ifdef CONFIG_QUICK_KEXEC + if (quick_kexec_res.end && + quick_kexec_res.start >= res->start && + quick_kexec_res.end <= res->end) + request_resource(res, &quick_kexec_res); +#endif if (boot_args[1] || boot_args[2] || boot_args[3]) { pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n" diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 481d22c32a2e..579acb93728f 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -130,6 +130,45 @@ static void __init reserve_crashkernel(void) } #endif /* CONFIG_KEXEC_CORE */ +#ifdef CONFIG_QUICK_KEXEC +static int __init parse_quick_kexec(char *p) +{ + if (!p) + return 0; + + quick_kexec_res.end = PAGE_ALIGN(memparse(p, NULL)); + + return 0; +} +early_param("quickkexec", parse_quick_kexec); + +static void __init reserve_quick_kexec(void) +{ + unsigned long long mem_start, mem_len; + + mem_len = quick_kexec_res.end; + if (mem_len == 0) + return; + + /* Current arm64 boot protocol requires 2MB alignment */ + mem_start = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT, + mem_len, CRASH_ALIGN); + if (mem_start == 0) { + pr_warn("cannot allocate quick kexec mem (size:0x%llx)\n", + mem_len); + quick_kexec_res.end = 0; + return; + } + + memblock_reserve(mem_start, mem_len); + pr_info("quick kexec mem reserved: 0x%016llx - 0x%016llx (%lld MB)\n", + mem_start, mem_start + mem_len, mem_len >> 20); + + quick_kexec_res.start = mem_start; + quick_kexec_res.end = mem_start + mem_len - 1; +} +#endif + #ifdef CONFIG_CRASH_DUMP static int __init early_init_dt_scan_elfcorehdr(unsigned long node, const char *uname, int depth, void *data) @@ -399,6 +438,10 @@ void __init arm64_memblock_init(void) reserve_crashkernel(); +#ifdef CONFIG_QUICK_KEXEC + reserve_quick_kexec(); +#endif + reserve_elfcorehdr(); high_memory = __va(memblock_end_of_DRAM() - 1) + 1; -- 2.19.1 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec