File xsa471-16.patch of Package xen.39653

# Commit 9b0f0f6e235618c2764e925b58c4bfe412730ced
# Date 2025-07-04 19:03:32 +0100
# Author Andrew Cooper <andrew.cooper3@citrix.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
x86/idle: Fix buggy "x86/mwait-idle: enable interrupts before C1 on Xeons"

The check of this_softirq_pending must be performed with irqs disabled, but
this property was broken by an attempt to optimise entry/exit latency.

Commit c227233ad64c in Linux (which we copied into Xen) was fixed up by
edc8fc01f608 in Linux, which we have so far missed.

Going to sleep without waking on interrupts is nonsensical outside of
play_dead(), so overload this to select between two possible MWAITs, the
second using the STI shadow to cover MWAIT for exactly the same reason as we
do in safe_halt().

Fixes: b17e0ec72ede ("x86/mwait-idle: enable interrupts before C1 on Xeons")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -79,6 +79,13 @@ static always_inline void mwait(unsigned
                    :: "a" (eax), "c" (ecx) );
 }
 
+static always_inline void sti_mwait_cli(unsigned int eax, unsigned int ecx)
+{
+    /* STI shadow covers MWAIT. */
+    asm volatile ( "sti; .byte 0x0f, 0x01, 0xc9;" /* mwait */ " cli"
+                   :: "a" (eax), "c" (ecx) );
+}
+
 #define GET_HW_RES_IN_NS(msr, val) \
     do { rdmsrl(msr, val); val = tsc_ticks2ns(val); } while( 0 )
 #define GET_MC6_RES(val)  GET_HW_RES_IN_NS(0x664, val)
@@ -473,12 +480,19 @@ void mwait_idle_with_hints(unsigned int
 
     monitor(this_softirq_pending, 0, 0);
 
+    ASSERT(!local_irq_is_enabled());
+
     if ( !*this_softirq_pending )
     {
         struct cpu_info *info = get_cpu_info();
 
         spec_ctrl_enter_idle(info);
-        mwait(eax, ecx);
+
+        if ( ecx & MWAIT_ECX_INTERRUPT_BREAK )
+            mwait(eax, ecx);
+        else
+            sti_mwait_cli(eax, ecx);
+
         spec_ctrl_exit_idle(info);
     }
 
--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -973,12 +973,8 @@ static void cf_check mwait_idle(void)
 
 	update_last_cx_stat(power, cx, before);
 
-	if (cx->irq_enable_early)
-		local_irq_enable();
-
-	mwait_idle_with_hints(cx->address, MWAIT_ECX_INTERRUPT_BREAK);
-
-	local_irq_disable();
+	mwait_idle_with_hints(cx->address,
+			      cx->irq_enable_early ? 0 : MWAIT_ECX_INTERRUPT_BREAK);
 
 	after = alternative_call(cpuidle_get_tick);