l1tf_select_mitigation

函数名称：l1tf_select_mitigation

函数原型：static void __init l1tf_select_mitigation(void)

返回类型：void

参数：无

1339

如果非boot_cpu_has_bug(CPU is affected by L1 Terminal Fault )则返回

1342

如果cpu_mitigations_off()则Default mitigation for L1TF-affected CPUs 等于L1TF_MITIGATION_OFF

1344

否则如果cpu_mitigations_auto_nosmt()则Default mitigation for L1TF-affected CPUs 等于L1TF_MITIGATION_FLUSH_NOSMT

1347

These CPUs all support 44bits physical address space internally in the* cache but CPUID can report a smaller number of physical address bits.* The L1TF mitigation uses the top most address bit for the inversion of* non present PTEs

1350

当:Default mitigation for L1TF-affected CPUs 恒等于L1TF_MITIGATION_OFF

1351

当:Default mitigation for L1TF-affected CPUs 恒等于L1TF_MITIGATION_FLUSH_NOWARN

1352

当:Default mitigation for L1TF-affected CPUs 恒等于L1TF_MITIGATION_FLUSH

1353

退出

1354

当:Default mitigation for L1TF-affected CPUs 恒等于L1TF_MITIGATION_FLUSH_NOSMT

1355

当:Default mitigation for L1TF-affected CPUs 恒等于L1TF_MITIGATION_FULL

1356

cpu_smt_disable(false)

1357

退出

1358

当:Default mitigation for L1TF-affected CPUs 恒等于L1TF_MITIGATION_FULL_FORCE

1359

cpu_smt_disable(true)

1360

退出

1368

half_pa等于l1tf_pfn_limit()左移PAGE_SHIFT determines the page size 位

1369

如果Default mitigation for L1TF-affected CPUs 不等于L1TF_MITIGATION_OFF且e820__mapped_any(half_pa, ULLONG_MAX - half_pa, E820_TYPE_RAM)则

1371

打印警告信息("System has more than MAX_PA/2 memory. L1TF mitigation not effective.\n")

1372

打印信息("You may make it effective by booting the kernel with mem=%llu parameter.\n", half_pa)

1374

打印信息("However, doing so will make a part of your RAM unusable.\n")

1375

打印信息("Reading https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html might help you decide.\n")

1376

1379

setup_force_cpu_cap("" L1TF workaround PTE inversion )

**调用者**
名称	描述
check_bugs	检查CPU配置是否非法使用不具备的功能

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告