linux-kernel - [tip: x86/paravirt] x86/paravirt: Use common code for paravirt_steal

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Message-ID: <176838721158.510.8626389043088172090.tip-bot2@tip-bot2>
Date: Wed, 14 Jan 2026 10:40:11 -0000
From: "tip-bot2 for Juergen Gross" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: x86/paravirt] x86/paravirt: Use common code for paravirt_steal_clock()

The following commit has been merged into the x86/paravirt branch of tip:

Commit-ID:     589f41f2f08bb48e041b513e49f9f61eec232d64
Gitweb:        https://git.kernel.org/tip/589f41f2f08bb48e041b513e49f9f61eec232d64
Author:        Juergen Gross <jgross@...e.com>
AuthorDate:    Mon, 05 Jan 2026 12:05:10 +01:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 12 Jan 2026 16:48:26 +01:00

x86/paravirt: Use common code for paravirt_steal_clock()

Remove the arch-specific variant of paravirt_steal_clock() and use
the common one instead.

With all archs supporting Xen now having been switched to the common
variant, including paravirt.h can be dropped from drivers/xen/time.c.

Signed-off-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://patch.msgid.link/20260105110520.21356-12-jgross@suse.com
---
 arch/x86/Kconfig                | 1 +
 arch/x86/include/asm/paravirt.h | 7 -------
 arch/x86/kernel/paravirt.c      | 6 ------
 arch/x86/xen/time.c             | 1 +
 drivers/xen/time.c              | 3 ---
 5 files changed, 2 insertions(+), 16 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1f30358..62e1157 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -799,6 +799,7 @@ if HYPERVISOR_GUEST
 config PARAVIRT
 	bool "Enable paravirtualization code"
 	depends on HAVE_STATIC_CALL
+	select HAVE_PV_STEAL_CLOCK_GEN
 	help
 	  This changes the kernel so it can modify itself when it is run
 	  under a hypervisor, potentially improving performance significantly
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 0ef797e..766a7ce 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -17,10 +17,8 @@
 #include <linux/static_call_types.h>
 #include <asm/frame.h>
 
-u64 dummy_steal_clock(int cpu);
 u64 dummy_sched_clock(void);
 
-DECLARE_STATIC_CALL(pv_steal_clock, dummy_steal_clock);
 DECLARE_STATIC_CALL(pv_sched_clock, dummy_sched_clock);
 
 void paravirt_set_sched_clock(u64 (*func)(void));
@@ -35,11 +33,6 @@ bool pv_is_native_spin_unlock(void);
 __visible bool __native_vcpu_is_preempted(long cpu);
 bool pv_is_native_vcpu_is_preempted(void);
 
-static inline u64 paravirt_steal_clock(int cpu)
-{
-	return static_call(pv_steal_clock)(cpu);
-}
-
 #ifdef CONFIG_PARAVIRT_SPINLOCKS
 void __init paravirt_set_cap(void);
 #endif
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index a3ba474..42991d4 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -60,12 +60,6 @@ void __init native_pv_lock_init(void)
 		static_branch_enable(&virt_spin_lock_key);
 }
 
-static u64 native_steal_clock(int cpu)
-{
-	return 0;
-}
-
-DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock);
 DEFINE_STATIC_CALL(pv_sched_clock, native_sched_clock);
 
 void paravirt_set_sched_clock(u64 (*func)(void))
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 96521b1..e4754b2 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -16,6 +16,7 @@
 #include <linux/slab.h>
 #include <linux/pvclock_gtod.h>
 #include <linux/timekeeper_internal.h>
+#include <linux/sched/cputime.h>
 
 #include <asm/pvclock.h>
 #include <asm/xen/hypervisor.h>
diff --git a/drivers/xen/time.c b/drivers/xen/time.c
index 53b12f5..0b18d8a 100644
--- a/drivers/xen/time.c
+++ b/drivers/xen/time.c
@@ -10,9 +10,6 @@
 #include <linux/static_call.h>
 #include <linux/sched/cputime.h>
 
-#ifndef CONFIG_HAVE_PV_STEAL_CLOCK_GEN
-#include <asm/paravirt.h>
-#endif
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/hypercall.h>