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arm/paravirt: Use common code for paravirt_steal_clock() 

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

This allows to remove paravirt.c and paravirt.h from arch/arm.

Until all archs supporting Xen have been switched to the common code
of paravirt_steal_clock(), drivers/xen/time.c needs to include
asm/paravirt.h for those archs, while this is not necessary for arm
any longer.

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/20260105110520.21356-8-jgross@suse.com
This commit is contained in:
Juergen Gross 2026-01-05 12:05:06 +01:00 committed by Borislav Petkov (AMD)
parent e6b2aa6d40
commit 15518e633b
5 changed files with 3 additions and 39 deletions
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1
arch/arm/Kconfig
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@ -1320,6 +1320,7 @@ config UACCESS_WITH_MEMCPY
config PARAVIRT
bool "Enable paravirtualization code"
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

18
arch/arm/include/asm/paravirt.h
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@ -1,18 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_ARM_PARAVIRT_H
#define _ASM_ARM_PARAVIRT_H
#ifdef CONFIG_PARAVIRT
#include <linux/static_call_types.h>
u64 dummy_steal_clock(int cpu);
DECLARE_STATIC_CALL(pv_steal_clock, dummy_steal_clock);
static inline u64 paravirt_steal_clock(int cpu)
{
return static_call(pv_steal_clock)(cpu);
}
#endif
#endif

1
arch/arm/kernel/Makefile
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@ -83,7 +83,6 @@ AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o
obj-$(CONFIG_VDSO) += vdso.o
obj-$(CONFIG_EFI) += efi.o
obj-$(CONFIG_PARAVIRT) += paravirt.o
obj-y += head$(MMUEXT).o
obj-$(CONFIG_DEBUG_LL) += debug.o

20
arch/arm/kernel/paravirt.c
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@ -1,20 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) 2013 Citrix Systems
*
* Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
*/
#include <linux/export.h>
#include <linux/jump_label.h>
#include <linux/types.h>
#include <linux/static_call.h>
#include <asm/paravirt.h>
static u64 native_steal_clock(int cpu)
{
return 0;
}
DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock);

2
drivers/xen/time.c
View File

@ -10,7 +10,9 @@
#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>