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ARM: KVM: Use common version of timer-sr.c

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Using the common HYP timer code is a bit more tricky, since we
use system register names. Nothing a set of macros cannot
work around...

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-01-28 14:48:42 +00:00
parent b5fa5d3e62
commit 68130cb5db
3 changed files with 10 additions and 70 deletions
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9
arch/arm/include/asm/kvm_hyp.h
View File

@ -104,6 +104,15 @@
#define VFP_FPEXC __ACCESS_VFP(FPEXC)
/* AArch64 compatibility macros, only for the timer so far */
#define read_sysreg_el0(r) read_sysreg(r##_el0)
#define write_sysreg_el0(v, r) write_sysreg(v, r##_el0)
#define cntv_ctl_el0 CNTV_CTL
#define cntv_cval_el0 CNTV_CVAL
#define cntvoff_el2 CNTVOFF
#define cnthctl_el2 CNTHCTL
void __timer_save_state(struct kvm_vcpu *vcpu);
void __timer_restore_state(struct kvm_vcpu *vcpu);

2
arch/arm/kvm/hyp/Makefile
View File

@ -5,10 +5,10 @@
KVM=../../../../virt/kvm
obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o
obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/timer-sr.o
obj-$(CONFIG_KVM_ARM_HOST) += tlb.o
obj-$(CONFIG_KVM_ARM_HOST) += cp15-sr.o
obj-$(CONFIG_KVM_ARM_HOST) += timer-sr.o
obj-$(CONFIG_KVM_ARM_HOST) += vfp.o
obj-$(CONFIG_KVM_ARM_HOST) += banked-sr.o
obj-$(CONFIG_KVM_ARM_HOST) += entry.o

69
arch/arm/kvm/hyp/timer-sr.c
View File

@ -1,69 +0,0 @@
/*
* Copyright (C) 2012-2015 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <clocksource/arm_arch_timer.h>
#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/kvm_hyp.h>
/* vcpu is already in the HYP VA space */
void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = kern_hyp_va(vcpu->kvm);
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
u64 val;
if (kvm->arch.timer.enabled) {
timer->cntv_ctl = read_sysreg(CNTV_CTL);
timer->cntv_cval = read_sysreg(CNTV_CVAL);
}
/* Disable the virtual timer */
write_sysreg(0, CNTV_CTL);
/* Allow physical timer/counter access for the host */
val = read_sysreg(CNTHCTL);
val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
write_sysreg(val, CNTHCTL);
/* Clear cntvoff for the host */
write_sysreg(0, CNTVOFF);
}
void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = kern_hyp_va(vcpu->kvm);
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
u64 val;
/*
* Disallow physical timer access for the guest
* Physical counter access is allowed
*/
val = read_sysreg(CNTHCTL);
val &= ~CNTHCTL_EL1PCEN;
val |= CNTHCTL_EL1PCTEN;
write_sysreg(val, CNTHCTL);
if (kvm->arch.timer.enabled) {
write_sysreg(kvm->arch.timer.cntvoff, CNTVOFF);
write_sysreg(timer->cntv_cval, CNTV_CVAL);
isb();
write_sysreg(timer->cntv_ctl, CNTV_CTL);
}
}