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

tip-bot2 for H. Peter Anvin (Intel)
2024-01-25T18:21:40Z

Commit-ID: 2cce95918d635126098d784c040b59333c464b20
Gitweb: https://git.kernel.org/tip/2cce95918d635126098d784c040b59333c464b20
Author: H. Peter Anvin (Intel) <hpa@zytor.com>
AuthorDate: Tue, 05 Dec 2023 02:49:54 -08:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 25 Jan 2024 19:10:30 +01:00

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

---
arch/x86/Kconfig | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5edec17..854ab38 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"