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Subject[PATCH v10 01/11] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

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
COFNIG_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.

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>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---

Changes since v9:
* None.

Changes since v8:
* Modified the code to reduce the __ASSEMBLY__ usage (as per
Josh Poimboeuf comments).

Changes since v7:
* None.

arch/x86/include/asm/irqflags.h | 44 +++++++++++++++------------
arch/x86/include/asm/paravirt.h | 20 ++++++------
arch/x86/include/asm/paravirt_types.h | 3 +-
arch/x86/kernel/paravirt.c | 3 +-
4 files changed, 37 insertions(+), 33 deletions(-)

diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
index c5ce9845c999..b794b6da3214 100644
--- a/arch/x86/include/asm/irqflags.h
+++ b/arch/x86/include/asm/irqflags.h
@@ -57,28 +57,11 @@ static inline __cpuidle void native_halt(void)
asm volatile("hlt": : :"memory");
}

-#endif
-
-#ifdef CONFIG_PARAVIRT_XXL
-#include <asm/paravirt.h>
-#else
-#ifndef __ASSEMBLY__
-#include <linux/types.h>
-
-static __always_inline unsigned long arch_local_save_flags(void)
-{
- return native_save_fl();
-}
+# ifdef CONFIG_PARAVIRT

-static __always_inline void arch_local_irq_disable(void)
-{
- native_irq_disable();
-}
+# include <asm/paravirt.h>

-static __always_inline void arch_local_irq_enable(void)
-{
- native_irq_enable();
-}
+# else /* ! CONFIG_PARAVIRT */

/*
* Used in the idle loop; sti takes one instruction cycle
@@ -97,6 +80,27 @@ static inline __cpuidle void halt(void)
{
native_halt();
}
+#endif /* CONFIG_PARAVIRT */
+# endif /* __ASSEMBLY__ */
+
+#ifndef CONFIG_PARAVIRT_XXL
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+
+static __always_inline unsigned long arch_local_save_flags(void)
+{
+ return native_save_fl();
+}
+
+static __always_inline void arch_local_irq_disable(void)
+{
+ native_irq_disable();
+}
+
+static __always_inline void arch_local_irq_enable(void)
+{
+ native_irq_enable();
+}

/*
* For spinlocks, etc:
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index da3a1ac82be5..d323a626c7a8 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -97,6 +97,16 @@ static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
PVOP_VCALL1(mmu.exit_mmap, mm);
}

+static 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)
{
@@ -162,16 +172,6 @@ static inline void __write_cr4(unsigned long x)
PVOP_VCALL1(cpu.write_cr4, x);
}

-static inline void arch_safe_halt(void)
-{
- PVOP_VCALL0(irq.safe_halt);
-}
-
-static inline void halt(void)
-{
- PVOP_VCALL0(irq.halt);
-}
-
static inline void wbinvd(void)
{
PVOP_ALT_VCALL0(cpu.wbinvd, "wbinvd", ALT_NOT(X86_FEATURE_XENPV));
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index d9d6b0203ec4..40082847f314 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -150,10 +150,9 @@ 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 {
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 04cafc057bed..8cea6e75ba29 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -283,9 +283,10 @@ struct paravirt_patch_template pv_ops = {
.irq.save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
.irq.irq_disable = __PV_IS_CALLEE_SAVE(native_irq_disable),
.irq.irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
+#endif /* CONFIG_PARAVIRT_XXL */
+
.irq.safe_halt = native_safe_halt,
.irq.halt = native_halt,
-#endif /* CONFIG_PARAVIRT_XXL */

/* Mmu ops. */
.mmu.flush_tlb_user = native_flush_tlb_local,
--
2.25.1
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