mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 22:48:38 +07:00
90de943a43
Make cntvoff per each timer context. This is helpful to abstract kvm timer functions to work with timer context without considering timer types (e.g. physical timer or virtual timer). This also would pave the way for ever doing adjustments of the cntvoff on a per-CPU basis if that should ever make sense. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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* Copyright (C) 2012-2015 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <clocksource/arm_arch_timer.h>
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#include <linux/compiler.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_hyp.h>
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/* vcpu is already in the HYP VA space */
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void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
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{
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struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
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struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
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u64 val;
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if (timer->enabled) {
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vtimer->cnt_ctl = read_sysreg_el0(cntv_ctl);
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vtimer->cnt_cval = read_sysreg_el0(cntv_cval);
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}
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/* Disable the virtual timer */
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write_sysreg_el0(0, cntv_ctl);
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/*
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* We don't need to do this for VHE since the host kernel runs in EL2
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* with HCR_EL2.TGE ==1, which makes those bits have no impact.
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*/
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if (!has_vhe()) {
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/* Allow physical timer/counter access for the host */
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val = read_sysreg(cnthctl_el2);
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val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
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write_sysreg(val, cnthctl_el2);
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}
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/* Clear cntvoff for the host */
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write_sysreg(0, cntvoff_el2);
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}
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void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu)
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{
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struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
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struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
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u64 val;
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/* Those bits are already configured at boot on VHE-system */
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if (!has_vhe()) {
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/*
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* Disallow physical timer access for the guest
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* Physical counter access is allowed
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*/
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val = read_sysreg(cnthctl_el2);
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val &= ~CNTHCTL_EL1PCEN;
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val |= CNTHCTL_EL1PCTEN;
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write_sysreg(val, cnthctl_el2);
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}
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if (timer->enabled) {
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write_sysreg(vtimer->cntvoff, cntvoff_el2);
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write_sysreg_el0(vtimer->cnt_cval, cntv_cval);
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isb();
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write_sysreg_el0(vtimer->cnt_ctl, cntv_ctl);
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}
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}
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