[PATCH 16/26] x86/topology: Disable CPU online/offline control for TDX guests

[Kirill A. Shutemov]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>

Unlike regular VMs, TDX guests use the firmware hand-off wakeup method
to wake up the APs during the boot process. This wakeup model uses a
mailbox to communicate with firmware to bring up the APs. As per the
design, this mailbox can only be used once for the given AP, which means
after the APs are booted, the same mailbox cannot be used to
offline/online the given AP. More details about this requirement can be
found in Intel TDX Virtual Firmware Design Guide, sec titled "AP
initialization in OS" and in sec titled "Hotplug Device".

Since the architecture does not support any method of offlining the
CPUs, disable CPU hotplug support in the kernel.

Since this hotplug disable feature can be re-used by other VM guests,
add a new CC attribute CC_ATTR_HOTPLUG_DISABLED and use it to disable
the hotplug support.

With hotplug disabled, /sys/devices/system/cpu/cpuX/online sysfs option
will not exist for TDX guests.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 arch/x86/kernel/cc_platform.c |  7 ++++++-
 include/linux/cc_platform.h   | 10 ++++++++++
 kernel/cpu.c                  |  3 +++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c
index 890452a85dae..2ed8652ab042 100644
--- a/arch/x86/kernel/cc_platform.c
+++ b/arch/x86/kernel/cc_platform.c
@@ -16,8 +16,13 @@
 
 static bool intel_cc_platform_has(enum cc_attr attr)
 {
-	if (attr == CC_ATTR_GUEST_UNROLL_STRING_IO)
+	switch (attr) {
+	case CC_ATTR_GUEST_UNROLL_STRING_IO:
+	case CC_ATTR_HOTPLUG_DISABLED:
 		return true;
+	default:
+		return false;
+	}
 
 	return false;
 }
diff --git a/include/linux/cc_platform.h b/include/linux/cc_platform.h
index f47f0c9edb3b..63b15108bc85 100644
--- a/include/linux/cc_platform.h
+++ b/include/linux/cc_platform.h
@@ -72,6 +72,16 @@ enum cc_attr {
 	 * Examples include TDX Guest & SEV.
 	 */
 	CC_ATTR_GUEST_UNROLL_STRING_IO,
+
+	/**
+	 * @CC_ATTR_HOTPLUG_DISABLED: Hotplug is not supported or disabled.
+	 *
+	 * The platform/OS is running as a guest/virtual machine does not
+	 * support CPU hotplug feature.
+	 *
+	 * Examples include TDX Guest.
+	 */
+	CC_ATTR_HOTPLUG_DISABLED,
 };
 
 #ifdef CONFIG_ARCH_HAS_CC_PLATFORM
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 192e43a87407..3c323aebd5b1 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -33,6 +33,7 @@
 #include <linux/slab.h>
 #include <linux/percpu-rwsem.h>
 #include <linux/cpuset.h>
+#include <linux/cc_platform.h>
 
 #include <trace/events/power.h>
 #define CREATE_TRACE_POINTS
@@ -1178,6 +1179,8 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen,
 
 static int cpu_down_maps_locked(unsigned int cpu, enum cpuhp_state target)
 {
+	if (cc_platform_has(CC_ATTR_HOTPLUG_DISABLED))
+		return -EOPNOTSUPP;
 	if (cpu_hotplug_disabled)
 		return -EBUSY;
 	return _cpu_down(cpu, 0, target);
-- 
2.32.0