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x86/paravirt: Use common code for paravirt_steal_clock()

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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@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260105110520.21356-12-jgross@suse.com
This commit is contained in:
Juergen Gross 2026-01-05 12:05:10 +01:00 • committed by Borislav Petkov (AMD)
parent ee9ffcf99f
commit 589f41f2f0
5 changed files with 2 additions and 16 deletions
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1
arch/x86/Kconfig
View file

@ -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

7
arch/x86/include/asm/paravirt.h
View file

@ -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

6
arch/x86/kernel/paravirt.c
View file

@ -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))

1
arch/x86/xen/time.c
View file

@ -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>

3
drivers/xen/time.c
View file

@ -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>