[RFC,v3,24/32] x86/fred: let ret_from_fork() jmp to fred_exit_user when FRED is enabled
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From: Xin Li <xin3.li@intel.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org
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Subject: [RFC PATCH v3 24/32] x86/fred: let ret_from_fork() jmp to
fred_exit_user when FRED is enabled
Date: Thu, 23 Feb 2023 23:01:37 -0800
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| Series |
x86: enable FRED for x86-64
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Commit Message
Li, Xin3
Feb. 24, 2023, 7:01 a.m. UTC
From: "H. Peter Anvin (Intel)" <hpa@zytor.com> Let ret_from_fork() jmp to 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> --- arch/x86/entry/entry_64.S | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 7ecd2aeeeffc..7ffd20578b8c 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -299,7 +299,12 @@ SYM_CODE_START_NOALIGN(ret_from_fork) UNWIND_HINT_REGS movq %rsp, %rdi call syscall_exit_to_user_mode /* returns with IRQs disabled */ +#ifdef CONFIG_X86_FRED + ALTERNATIVE "jmp swapgs_restore_regs_and_return_to_usermode", \ + "jmp fred_exit_user", X86_FEATURE_FRED +#else jmp swapgs_restore_regs_and_return_to_usermode +#endif 1: /* kernel thread */