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xen: features and fixes for 4.5-rc0

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- Stolen ticks and PV wallclock support for arm/arm64.
 - Add grant copy ioctl to gntdev device.
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Merge tag 'for-linus-4.5-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen updates from David Vrabel:
 "Xen features and fixes for 4.5-rc0:

   - Stolen ticks and PV wallclock support for arm/arm64

   - Add grant copy ioctl to gntdev device"

* tag 'for-linus-4.5-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/gntdev: add ioctl for grant copy
  x86/xen: don't reset vcpu_info on a cancelled suspend
  xen/gntdev: constify mmu_notifier_ops structures
  xen/grant-table: constify gnttab_ops structure
  xen/time: use READ_ONCE
  xen/x86: convert remaining timespec to timespec64 in xen_pvclock_gtod_notify
  xen/x86: support XENPF_settime64
  xen/arm: set the system time in Xen via the XENPF_settime64 hypercall
  xen/arm: introduce xen_read_wallclock
  arm: extend pvclock_wall_clock with sec_hi
  xen: introduce XENPF_settime64
  xen/arm: introduce HYPERVISOR_platform_op on arm and arm64
  xen: rename dom0_op to platform_op
  xen/arm: account for stolen ticks
  arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
  arm: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
  missing include asm/paravirt.h in cputime.c
  xen: move xen_setup_runstate_info and get_runstate_snapshot to drivers/xen/time.c
This commit is contained in:
Linus Torvalds 2016-01-12 13:05:36 -08:00
commit c9bed1cf51
34 changed files with 677 additions and 131 deletions
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20
arch/arm64/Kconfig
View file

@ -555,6 +555,25 @@ config SECCOMP
and the task is only allowed to execute a few safe syscalls
defined by each seccomp mode.
config PARAVIRT
bool "Enable paravirtualization code"
help
This changes the kernel so it can modify itself when it is run
under a hypervisor, potentially improving performance significantly
over full virtualization.
config PARAVIRT_TIME_ACCOUNTING
bool "Paravirtual steal time accounting"
select PARAVIRT
default n
help
Select this option to enable fine granularity task steal time
accounting. Time spent executing other tasks in parallel with
the current vCPU is discounted from the vCPU power. To account for
that, there can be a small performance impact.
If in doubt, say N here.
config XEN_DOM0
def_bool y
depends on XEN
@ -563,6 +582,7 @@ config XEN
bool "Xen guest support on ARM64"
depends on ARM64 && OF
select SWIOTLB_XEN
select PARAVIRT
help
Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.

20
arch/arm64/include/asm/paravirt.h Normal file
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@ -0,0 +1,20 @@
#ifndef _ASM_ARM64_PARAVIRT_H
#define _ASM_ARM64_PARAVIRT_H
#ifdef CONFIG_PARAVIRT
struct static_key;
extern struct static_key paravirt_steal_enabled;
extern struct static_key paravirt_steal_rq_enabled;
struct pv_time_ops {
unsigned long long (*steal_clock)(int cpu);
};
extern struct pv_time_ops pv_time_ops;
static inline u64 paravirt_steal_clock(int cpu)
{
return pv_time_ops.steal_clock(cpu);
}
#endif
#endif

1
arch/arm64/kernel/Makefile
View file

@ -41,6 +41,7 @@ arm64-obj-$(CONFIG_EFI) += efi.o efi-entry.stub.o
arm64-obj-$(CONFIG_PCI) += pci.o
arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
arm64-obj-$(CONFIG_ACPI) += acpi.o
arm64-obj-$(CONFIG_PARAVIRT) += paravirt.o
obj-y += $(arm64-obj-y) vdso/
obj-m += $(arm64-obj-m)

25
arch/arm64/kernel/paravirt.c Normal file
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@ -0,0 +1,25 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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 <asm/paravirt.h>
struct static_key paravirt_steal_enabled;
struct static_key paravirt_steal_rq_enabled;
struct pv_time_ops pv_time_ops;
EXPORT_SYMBOL_GPL(pv_time_ops);

1
arch/arm64/xen/hypercall.S
View file

@ -80,6 +80,7 @@ HYPERCALL2(memory_op);
HYPERCALL2(physdev_op);
HYPERCALL3(vcpu_op);
HYPERCALL1(tmem_op);
HYPERCALL1(platform_op_raw);
HYPERCALL2(multicall);
ENTRY(privcmd_call)