x86: Support huge vmalloc mappings

maillist inclusion
category: Feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NDAW
CVE: NA

Reference: https://lore.kernel.org/lkml/20211226083912.166512-4-wangkefeng.wang@huawei.com/t/

-------------------

This patch select HAVE_ARCH_HUGE_VMALLOC to let X86_64 and X86_PAE
support huge vmalloc mappings, it is disabled by default, use
hugevmalloc=on to enable it.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NWang Wensheng <wangwensheng4@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

Documentation/admin-guide/kernel-parameters.txt

@@ -1587,7 +1587,7 @@
 			on:  enable the feature
 			off: disable the feature
 
-	hugevmalloc	[KNL,PPC,ARM64] Requires CONFIG_HAVE_ARCH_HUGE_VMALLOC
+	hugevmalloc	[KNL,PPC,ARM64,X86] Requires CONFIG_HAVE_ARCH_HUGE_VMALLOC
 			Format: { on | off }
 			Default set by CONFIG_HUGE_VMALLOC_DEFAULT_ENABLED.
 
@@ -3312,7 +3312,7 @@
 
 	nohugeiomap	[KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
 
-	nohugevmalloc	[KNL,PPC,ARM64] Disable kernel huge vmalloc mappings.
+	nohugevmalloc	[KNL,PPC,ARM64,X86] Disable kernel huge vmalloc mappings.
 
 	nosmt		[KNL,S390] Disable symmetric multithreading (SMT).
 			Equivalent to smt=1.

arch/x86/Kconfig

@@ -143,6 +143,7 @@ config X86
 	select HAVE_ACPI_APEI_NMI		if ACPI
 	select HAVE_ALIGNED_STRUCT_PAGE		if SLUB
 	select HAVE_ARCH_AUDITSYSCALL
+	select HAVE_ARCH_HUGE_VMALLOC		if HAVE_ARCH_HUGE_VMAP
 	select HAVE_ARCH_HUGE_VMAP		if X86_64 || X86_PAE
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE

arch/x86/kernel/module.c

@@ -75,7 +75,7 @@ void *module_alloc(unsigned long size)
 	p = __vmalloc_node_range(size, MODULE_ALIGN,
 				    MODULES_VADDR + get_module_load_offset(),
 				    MODULES_END, GFP_KERNEL,
-				    PAGE_KERNEL, 0, NUMA_NO_NODE,
+				    PAGE_KERNEL, VM_NO_HUGE_VMAP, NUMA_NO_NODE,
 				    __builtin_return_address(0));
 	if (p && (kasan_module_alloc(p, size) < 0)) {
 		vfree(p);