diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/timer-sr.c')
-rw-r--r-- | arch/arm64/kvm/hyp/nvhe/timer-sr.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/timer-sr.c b/arch/arm64/kvm/hyp/nvhe/timer-sr.c new file mode 100644 index 0000000000..3aaab20ae5 --- /dev/null +++ b/arch/arm64/kvm/hyp/nvhe/timer-sr.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2012-2015 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + */ + +#include <clocksource/arm_arch_timer.h> +#include <linux/compiler.h> +#include <linux/kvm_host.h> + +#include <asm/kvm_hyp.h> +#include <asm/kvm_mmu.h> + +void __kvm_timer_set_cntvoff(u64 cntvoff) +{ + write_sysreg(cntvoff, cntvoff_el2); +} + +/* + * Should only be called on non-VHE or hVHE setups. + * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe(). + */ +void __timer_disable_traps(struct kvm_vcpu *vcpu) +{ + u64 val, shift = 0; + + if (has_hvhe()) + shift = 10; + + /* Allow physical timer/counter access for the host */ + val = read_sysreg(cnthctl_el2); + val |= (CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN) << shift; + write_sysreg(val, cnthctl_el2); +} + +/* + * Should only be called on non-VHE or hVHE setups. + * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe(). + */ +void __timer_enable_traps(struct kvm_vcpu *vcpu) +{ + u64 clr = 0, set = 0; + + /* + * Disallow physical timer access for the guest + * Physical counter access is allowed if no offset is enforced + * or running protected (we don't offset anything in this case). + */ + clr = CNTHCTL_EL1PCEN; + if (is_protected_kvm_enabled() || + !kern_hyp_va(vcpu->kvm)->arch.timer_data.poffset) + set |= CNTHCTL_EL1PCTEN; + else + clr |= CNTHCTL_EL1PCTEN; + + if (has_hvhe()) { + clr <<= 10; + set <<= 10; + } + + sysreg_clear_set(cnthctl_el2, clr, set); +} |