diff options
Diffstat (limited to 'arch/x86/entry/entry.S')
| -rw-r--r-- | arch/x86/entry/entry.S | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/x86/entry/entry.S b/arch/x86/entry/entry.S index bfb7bcb362..0033790499 100644 --- a/arch/x86/entry/entry.S +++ b/arch/x86/entry/entry.S @@ -3,9 +3,12 @@ * Common place for both 32- and 64-bit entry routines. */ +#include <linux/export.h> #include <linux/linkage.h> -#include <asm/export.h> #include <asm/msr-index.h> +#include <asm/unwind_hints.h> +#include <asm/segment.h> +#include <asm/cache.h> .pushsection .noinstr.text, "ax" @@ -20,3 +23,23 @@ SYM_FUNC_END(entry_ibpb) EXPORT_SYMBOL_GPL(entry_ibpb); .popsection + +/* + * Define the VERW operand that is disguised as entry code so that + * it can be referenced with KPTI enabled. This ensure VERW can be + * used late in exit-to-user path after page tables are switched. + */ +.pushsection .entry.text, "ax" + +.align L1_CACHE_BYTES, 0xcc +SYM_CODE_START_NOALIGN(mds_verw_sel) + UNWIND_HINT_UNDEFINED + ANNOTATE_NOENDBR + .word __KERNEL_DS +.align L1_CACHE_BYTES, 0xcc +SYM_CODE_END(mds_verw_sel); +/* For KVM */ +EXPORT_SYMBOL_GPL(mds_verw_sel); + +.popsection + |