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| author | H. Peter Anvin (Intel) <hpa@zytor.com> | 2023-12-05 02:50:17 -0800 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-01-31 22:02:59 +0100 |
| commit | 51ef2a4da7ec347e3315af69a426ac36fab98a6c (patch) | |
| tree | 087c8d0d2cae6f171e6a8763253b57650d8d3026 | |
| parent | 8f4a29b0e8a40d865040800684d7ff4141c1394f (diff) | |
| download | linux-51ef2a4da7ec347e3315af69a426ac36fab98a6c.tar.gz linux-51ef2a4da7ec347e3315af69a426ac36fab98a6c.tar.bz2 linux-51ef2a4da7ec347e3315af69a426ac36fab98a6c.zip | |
x86/fred: Let ret_from_fork_asm() jmp to asm_fred_exit_user when FRED is enabled
Let ret_from_fork_asm() jmp to asm_fred_exit_user when FRED is enabled,
otherwise the existing IDT code is chosen.
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-29-xin3.li@intel.com
| -rw-r--r-- | arch/x86/entry/entry_64.S | 6 | ||||
| -rw-r--r-- | arch/x86/entry/entry_64_fred.S | 1 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 29ce68f8ede0..7c4b7263b857 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -247,7 +247,13 @@ SYM_CODE_START(ret_from_fork_asm) * and unwind should work normally. */ UNWIND_HINT_REGS + +#ifdef CONFIG_X86_FRED + ALTERNATIVE "jmp swapgs_restore_regs_and_return_to_usermode", \ + "jmp asm_fred_exit_user", X86_FEATURE_FRED +#else jmp swapgs_restore_regs_and_return_to_usermode +#endif SYM_CODE_END(ret_from_fork_asm) .popsection diff --git a/arch/x86/entry/entry_64_fred.S b/arch/x86/entry/entry_64_fred.S index c1ddaf6b068f..2271a1c690dc 100644 --- a/arch/x86/entry/entry_64_fred.S +++ b/arch/x86/entry/entry_64_fred.S @@ -32,6 +32,7 @@ SYM_CODE_START_NOALIGN(asm_fred_entrypoint_user) FRED_ENTER call fred_entry_from_user +SYM_INNER_LABEL(asm_fred_exit_user, SYM_L_GLOBAL) FRED_EXIT ERETU SYM_CODE_END(asm_fred_entrypoint_user) |