x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT

jira LE-2729
build-fix Fix build when XEN_PV is not set
commit-author Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
commit 22cc5ca
upstream-diff Had to fix a couple of trivial merge conflicts because
              this kernel hasn't removed paravirt_disable_iospace
              and pv_native_wbindvd yet

CONFIG_PARAVIRT_XXL is mainly defined/used by XEN PV guests. For
other VM guest types, features supported under CONFIG_PARAVIRT
are self sufficient. CONFIG_PARAVIRT mainly provides support for
TLB flush operations and time related operations.

For TDX guest as well, paravirt calls under CONFIG_PARVIRT meets
most of its requirement except the need of HLT and SAFE_HLT
paravirt calls, which is currently defined under
CONFIG_PARAVIRT_XXL.

Since enabling CONFIG_PARAVIRT_XXL is too bloated for TDX guest
like platforms, move HLT and SAFE_HLT paravirt calls under
CONFIG_PARAVIRT.

Moving HLT and SAFE_HLT paravirt calls are not fatal and should not
break any functionality for current users of CONFIG_PARAVIRT.

Fixes: bfe6ed0 ("x86/tdx: Add HLT support for TDX guests")
Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
	Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
	Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
	Signed-off-by: Vishal Annapurve <vannapurve@google.com>
	Signed-off-by: Ingo Molnar <mingo@kernel.org>
	Reviewed-by: Andi Kleen <ak@linux.intel.com>
	Reviewed-by: Tony Luck <tony.luck@intel.com>
	Reviewed-by: Juergen Gross <jgross@suse.com>
	Tested-by: Ryan Afranji <afranji@google.com>
	Cc: Andy Lutomirski <luto@kernel.org>
	Cc: Brian Gerst <brgerst@gmail.com>
	Cc: H. Peter Anvin <hpa@zytor.com>
	Cc: Linus Torvalds <torvalds@linux-foundation.org>
	Cc: Josh Poimboeuf <jpoimboe@redhat.com>
	Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20250228014416.3925664-2-vannapurve@google.com
(cherry picked from commit 22cc5ca)
	Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>

Author: bmastbergen

arch/x86/include/asm/irqflags.h

@@ -76,6 +76,28 @@ static __always_inline void native_local_irq_restore(unsigned long flags)
 
 #endif
 
+#ifndef CONFIG_PARAVIRT
+#ifndef __ASSEMBLY__
+/*
+ * Used in the idle loop; sti takes one instruction cycle
+ * to complete:
+ */
+static __always_inline void arch_safe_halt(void)
+{
+	native_safe_halt();
+}
+
+/*
+ * Used when interrupts are already enabled or to
+ * shutdown the processor:
+ */
+static __always_inline void halt(void)
+{
+	native_halt();
+}
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_PARAVIRT */
+
 #ifdef CONFIG_PARAVIRT_XXL
 #include <asm/paravirt.h>
 #else
@@ -97,24 +119,6 @@ static __always_inline void arch_local_irq_enable(void)
 	native_irq_enable();
 }
 
-/*
- * Used in the idle loop; sti takes one instruction cycle
- * to complete:
- */
-static __always_inline void arch_safe_halt(void)
-{
-	native_safe_halt();
-}
-
-/*
- * Used when interrupts are already enabled or to
- * shutdown the processor:
- */
-static __always_inline void halt(void)
-{
-	native_halt();
-}
-
 /*
  * For spinlocks, etc:
  */

arch/x86/include/asm/paravirt.h

@@ -107,6 +107,16 @@ static inline void notify_page_enc_status_changed(unsigned long pfn,
 	PVOP_VCALL3(mmu.notify_page_enc_status_changed, pfn, npages, enc);
 }
 
+static __always_inline void arch_safe_halt(void)
+{
+	PVOP_VCALL0(irq.safe_halt);
+}
+
+static inline void halt(void)
+{
+	PVOP_VCALL0(irq.halt);
+}
+
 #ifdef CONFIG_PARAVIRT_XXL
 static inline void load_sp0(unsigned long sp0)
 {
@@ -170,16 +180,6 @@ static inline void __write_cr4(unsigned long x)
 	PVOP_VCALL1(cpu.write_cr4, x);
 }
 
-static __always_inline void arch_safe_halt(void)
-{
-	PVOP_VCALL0(irq.safe_halt);
-}
-
-static inline void halt(void)
-{
-	PVOP_VCALL0(irq.halt);
-}
-
 extern noinstr void pv_native_wbinvd(void);
 
 static __always_inline void wbinvd(void)

arch/x86/include/asm/paravirt_types.h

@@ -122,10 +122,9 @@ struct pv_irq_ops {
 	struct paravirt_callee_save save_fl;
 	struct paravirt_callee_save irq_disable;
 	struct paravirt_callee_save irq_enable;
-
+#endif
 	void (*safe_halt)(void);
 	void (*halt)(void);
-#endif
 } __no_randomize_layout;
 
 struct pv_mmu_ops {

arch/x86/kernel/paravirt.c

@@ -100,6 +100,11 @@ int paravirt_disable_iospace(void)
 	return request_resource(&ioport_resource, &reserve_ioports);
 }
 
+static noinstr void pv_native_safe_halt(void)
+{
+	native_safe_halt();
+}
+
 #ifdef CONFIG_PARAVIRT_XXL
 static noinstr void pv_native_write_cr2(unsigned long val)
 {
@@ -120,11 +125,6 @@ noinstr void pv_native_wbinvd(void)
 {
 	native_wbinvd();
 }
-
-static noinstr void pv_native_safe_halt(void)
-{
-	native_safe_halt();
-}
 #endif
 
 struct pv_info pv_info = {
@@ -182,9 +182,11 @@ struct paravirt_patch_template pv_ops = {
 	.irq.save_fl		= __PV_IS_CALLEE_SAVE(pv_native_save_fl),
 	.irq.irq_disable	= __PV_IS_CALLEE_SAVE(pv_native_irq_disable),
 	.irq.irq_enable		= __PV_IS_CALLEE_SAVE(pv_native_irq_enable),
+#endif /* CONFIG_PARAVIRT_XXL */
+
+	/* Irq HLT ops. */
 	.irq.safe_halt		= pv_native_safe_halt,
 	.irq.halt		= native_halt,
-#endif /* CONFIG_PARAVIRT_XXL */
 
 	/* Mmu ops. */
 	.mmu.flush_tlb_user	= native_flush_tlb_local,