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x86/retpoline: Cleanup some #ifdefery 

On it's own not much of a cleanup but it prepares for more/similar
code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Peter Zijlstra 2022-06-14 23:15:34 +02:00 committed by Borislav Petkov
parent a883d624ae
commit 369ae6ffc4
3 changed files with 14 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/include/asm/disabled-features.h
View File

@ -50,6 +50,13 @@
# define DISABLE_PTI (1 << (X86_FEATURE_PTI & 31))
#endif
#ifdef CONFIG_RETPOLINE
# define DISABLE_RETPOLINE 0
#else
# define DISABLE_RETPOLINE ((1 << (X86_FEATURE_RETPOLINE & 31)) | \
(1 << (X86_FEATURE_RETPOLINE_LFENCE & 31)))
#endif
#ifdef CONFIG_INTEL_IOMMU_SVM
# define DISABLE_ENQCMD 0
#else
@ -82,7 +89,7 @@
#define DISABLED_MASK8 (DISABLE_TDX_GUEST)
#define DISABLED_MASK9 (DISABLE_SGX)
#define DISABLED_MASK10 0
#define DISABLED_MASK11 0
#define DISABLED_MASK11 (DISABLE_RETPOLINE)
#define DISABLED_MASK12 0
#define DISABLED_MASK13 0
#define DISABLED_MASK14 0

7
arch/x86/include/asm/nospec-branch.h
View File

@ -120,17 +120,16 @@
_ASM_PTR " 999b\n\t" \
".popsection\n\t"
#ifdef CONFIG_RETPOLINE
typedef u8 retpoline_thunk_t[RETPOLINE_THUNK_SIZE];
extern retpoline_thunk_t __x86_indirect_thunk_array[];
#ifdef CONFIG_RETPOLINE
#define GEN(reg) \
extern retpoline_thunk_t __x86_indirect_thunk_ ## reg;
#include <asm/GEN-for-each-reg.h>
#undef GEN
extern retpoline_thunk_t __x86_indirect_thunk_array[];
#ifdef CONFIG_X86_64
/*

7
arch/x86/net/bpf_jit_comp.c
View File

@ -412,16 +412,15 @@ static void emit_indirect_jump(u8 **pprog, int reg, u8 *ip)
{
u8 *prog = *pprog;
#ifdef CONFIG_RETPOLINE
if (cpu_feature_enabled(X86_FEATURE_RETPOLINE_LFENCE)) {
EMIT_LFENCE();
EMIT2(0xFF, 0xE0 + reg);
} else if (cpu_feature_enabled(X86_FEATURE_RETPOLINE)) {
OPTIMIZER_HIDE_VAR(reg);
emit_jump(&prog, &__x86_indirect_thunk_array[reg], ip);
} else
#endif
EMIT2(0xFF, 0xE0 + reg);
} else {
EMIT2(0xFF, 0xE0 + reg);
}
*pprog = prog;
}