arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
Introduce CONFIG_PARAVIRT and PARAVIRT_TIME_ACCOUNTING on ARM64. Necessary duplication of paravirt.h and paravirt.c with ARM. The only paravirt interface supported is pv_time_ops.steal_clock, so no runtime pvops patching needed. This allows us to make use of steal_account_process_tick for stolen ticks accounting. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
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@ -556,6 +556,25 @@ config SECCOMP
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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config PARAVIRT
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bool "Enable paravirtualization code"
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help
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This changes the kernel so it can modify itself when it is run
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under a hypervisor, potentially improving performance significantly
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over full virtualization.
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config PARAVIRT_TIME_ACCOUNTING
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bool "Paravirtual steal time accounting"
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select PARAVIRT
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default n
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help
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Select this option to enable fine granularity task steal time
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accounting. Time spent executing other tasks in parallel with
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the current vCPU is discounted from the vCPU power. To account for
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that, there can be a small performance impact.
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If in doubt, say N here.
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config XEN_DOM0
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def_bool y
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depends on XEN
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@ -564,6 +583,7 @@ config XEN
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bool "Xen guest support on ARM64"
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depends on ARM64 && OF
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select SWIOTLB_XEN
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select PARAVIRT
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help
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Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
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20
arch/arm64/include/asm/paravirt.h
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arch/arm64/include/asm/paravirt.h
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@ -0,0 +1,20 @@
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#ifndef _ASM_ARM64_PARAVIRT_H
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#define _ASM_ARM64_PARAVIRT_H
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#ifdef CONFIG_PARAVIRT
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struct static_key;
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extern struct static_key paravirt_steal_enabled;
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extern struct static_key paravirt_steal_rq_enabled;
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struct pv_time_ops {
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unsigned long long (*steal_clock)(int cpu);
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};
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extern struct pv_time_ops pv_time_ops;
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static inline u64 paravirt_steal_clock(int cpu)
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{
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return pv_time_ops.steal_clock(cpu);
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}
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#endif
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#endif
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@ -41,6 +41,7 @@ arm64-obj-$(CONFIG_EFI) += efi.o efi-entry.stub.o
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arm64-obj-$(CONFIG_PCI) += pci.o
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arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
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arm64-obj-$(CONFIG_ACPI) += acpi.o
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arm64-obj-$(CONFIG_PARAVIRT) += paravirt.o
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obj-y += $(arm64-obj-y) vdso/
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obj-m += $(arm64-obj-m)
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25
arch/arm64/kernel/paravirt.c
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25
arch/arm64/kernel/paravirt.c
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@ -0,0 +1,25 @@
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2013 Citrix Systems
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*
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* Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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*/
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#include <linux/export.h>
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#include <linux/jump_label.h>
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#include <linux/types.h>
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#include <asm/paravirt.h>
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struct static_key paravirt_steal_enabled;
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struct static_key paravirt_steal_rq_enabled;
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struct pv_time_ops pv_time_ops;
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EXPORT_SYMBOL_GPL(pv_time_ops);
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