From: H. Peter Anvin (Intel) <hpa@zytor.com>
Date: Tue, 5 Dec 2023 10:49:54 +0000 (-0800)
Subject: x86/fred: Add Kconfig option for FRED (CONFIG_X86_FRED)
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2cce95918d635126098d784c040b59333c464b20;p=linux.git

x86/fred: Add Kconfig option for FRED (CONFIG_X86_FRED)

Add the configuration option CONFIG_X86_FRED to enable FRED.

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>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-6-xin3.li@intel.com
---

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5edec175b9bfc..854ab38a359a2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -496,6 +496,15 @@ config X86_CPU_RESCTRL
 
 	  Say N if unsure.
 
+config X86_FRED
+	bool "Flexible Return and Event Delivery"
+	depends on X86_64
+	help
+	  When enabled, try to use Flexible Return and Event Delivery
+	  instead of the legacy SYSCALL/SYSENTER/IDT architecture for
+	  ring transitions and exception/interrupt handling if the
+	  system supports.
+
 if X86_32
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"