x86/xen: Move Xen upcall handler

Move the upcall handler to Xen-specific files.

No functional changes.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20250314151220.862768-2-brgerst@gmail.com

2 files changed, 69 insertions, 72 deletions

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 3514bf2978ee..ce4d88eda693 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -21,11 +21,6 @@
 #include <linux/uaccess.h>
 #include <linux/init.h>
 
-#ifdef CONFIG_XEN_PV
-#include <xen/xen-ops.h>
-#include <xen/events.h>
-#endif
-
 #include <asm/apic.h>
 #include <asm/desc.h>
 #include <asm/traps.h>
@@ -455,70 +450,3 @@ SYSCALL_DEFINE0(ni_syscall)
 {
 	return -ENOSYS;
 }
-
-#ifdef CONFIG_XEN_PV
-#ifndef CONFIG_PREEMPTION
-/*
- * Some hypercalls issued by the toolstack can take many 10s of
- * seconds. Allow tasks running hypercalls via the privcmd driver to
- * be voluntarily preempted even if full kernel preemption is
- * disabled.
- *
- * Such preemptible hypercalls are bracketed by
- * xen_preemptible_hcall_begin() and xen_preemptible_hcall_end()
- * calls.
- */
-DEFINE_PER_CPU(bool, xen_in_preemptible_hcall);
-EXPORT_SYMBOL_GPL(xen_in_preemptible_hcall);
-
-/*
- * In case of scheduling the flag must be cleared and restored after
- * returning from schedule as the task might move to a different CPU.
- */
-static __always_inline bool get_and_clear_inhcall(void)
-{
-	bool inhcall = __this_cpu_read(xen_in_preemptible_hcall);
-
-	__this_cpu_write(xen_in_preemptible_hcall, false);
-	return inhcall;
-}
-
-static __always_inline void restore_inhcall(bool inhcall)
-{
-	__this_cpu_write(xen_in_preemptible_hcall, inhcall);
-}
-#else
-static __always_inline bool get_and_clear_inhcall(void) { return false; }
-static __always_inline void restore_inhcall(bool inhcall) { }
-#endif
-
-static void __xen_pv_evtchn_do_upcall(struct pt_regs *regs)
-{
-	struct pt_regs *old_regs = set_irq_regs(regs);
-
-	inc_irq_stat(irq_hv_callback_count);
-
-	xen_evtchn_do_upcall();
-
-	set_irq_regs(old_regs);
-}
-
-__visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)
-{
-	irqentry_state_t state = irqentry_enter(regs);
-	bool inhcall;
-
-	instrumentation_begin();
-	run_sysvec_on_irqstack_cond(__xen_pv_evtchn_do_upcall, regs);
-
-	inhcall = get_and_clear_inhcall();
-	if (inhcall && !WARN_ON_ONCE(state.exit_rcu)) {
-		irqentry_exit_cond_resched();
-		instrumentation_end();
-		restore_inhcall(inhcall);
-	} else {
-		instrumentation_end();
-		irqentry_exit(regs, state);
-	}
-}
-#endif /* CONFIG_XEN_PV */
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 5e57835e999d..dcc2041f8e61 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -73,6 +73,7 @@
 #include <asm/mwait.h>
 #include <asm/pci_x86.h>
 #include <asm/cpu.h>
+#include <asm/irq_stack.h>
 #ifdef CONFIG_X86_IOPL_IOPERM
 #include <asm/io_bitmap.h>
 #endif
@@ -94,6 +95,44 @@ void *xen_initial_gdt;
 static int xen_cpu_up_prepare_pv(unsigned int cpu);
 static int xen_cpu_dead_pv(unsigned int cpu);
 
+#ifndef CONFIG_PREEMPTION
+/*
+ * Some hypercalls issued by the toolstack can take many 10s of
+ * seconds. Allow tasks running hypercalls via the privcmd driver to
+ * be voluntarily preempted even if full kernel preemption is
+ * disabled.
+ *
+ * Such preemptible hypercalls are bracketed by
+ * xen_preemptible_hcall_begin() and xen_preemptible_hcall_end()
+ * calls.
+ */
+DEFINE_PER_CPU(bool, xen_in_preemptible_hcall);
+EXPORT_SYMBOL_GPL(xen_in_preemptible_hcall);
+
+/*
+ * In case of scheduling the flag must be cleared and restored after
+ * returning from schedule as the task might move to a different CPU.
+ */
+static __always_inline bool get_and_clear_inhcall(void)
+{
+	bool inhcall = __this_cpu_read(xen_in_preemptible_hcall);
+
+	__this_cpu_write(xen_in_preemptible_hcall, false);
+	return inhcall;
+}
+
+static __always_inline void restore_inhcall(bool inhcall)
+{
+	__this_cpu_write(xen_in_preemptible_hcall, inhcall);
+}
+
+#else
+
+static __always_inline bool get_and_clear_inhcall(void) { return false; }
+static __always_inline void restore_inhcall(bool inhcall) { }
+
+#endif
+
 struct tls_descs {
 	struct desc_struct desc[3];
 };
@@ -687,6 +726,36 @@ DEFINE_IDTENTRY_RAW(xenpv_exc_machine_check)
 }
 #endif
 
+static void __xen_pv_evtchn_do_upcall(struct pt_regs *regs)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
+
+	inc_irq_stat(irq_hv_callback_count);
+
+	xen_evtchn_do_upcall();
+
+	set_irq_regs(old_regs);
+}
+
+__visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)
+{
+	irqentry_state_t state = irqentry_enter(regs);
+	bool inhcall;
+
+	instrumentation_begin();
+	run_sysvec_on_irqstack_cond(__xen_pv_evtchn_do_upcall, regs);
+
+	inhcall = get_and_clear_inhcall();
+	if (inhcall && !WARN_ON_ONCE(state.exit_rcu)) {
+		irqentry_exit_cond_resched();
+		instrumentation_end();
+		restore_inhcall(inhcall);
+	} else {
+		instrumentation_end();
+		irqentry_exit(regs, state);
+	}
+}
+
 struct trap_array_entry {
 	void (*orig)(void);
 	void (*xen)(void);