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KVM: arm64: Remove noop calls to timer save/restore from VHE switch

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The VHE switch function calls __timer_enable_traps and
__timer_disable_traps which don't do anything on VHE systems.
Therefore, simply remove these calls from the VHE switch function and
make the functions non-conditional as they are now only called from the
non-VHE switch path.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Christoffer Dall 2017-08-05 22:51:35 +02:00 committed by Marc Zyngier
parent 34f8cdf1df
commit 04fef05700
2 changed files with 22 additions and 24 deletions
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2
arch/arm64/kvm/hyp/switch.c
View File

@ -379,7 +379,6 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
__activate_vm(vcpu->kvm);
__vgic_restore_state(vcpu);
__timer_enable_traps(vcpu);
/*
* We must restore the 32-bit state before the sysregs, thanks
@ -400,7 +399,6 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
__sysreg_save_guest_state(guest_ctxt);
__sysreg32_save_state(vcpu);
__timer_disable_traps(vcpu);
__vgic_save_state(vcpu);
__deactivate_traps(vcpu);

44
virt/kvm/arm/hyp/timer-sr.c
View File

@ -27,34 +27,34 @@ void __hyp_text __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high)
write_sysreg(cntvoff, cntvoff_el2);
}
/*
* Should only be called on non-VHE systems.
* VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
*/
void __hyp_text __timer_disable_traps(struct kvm_vcpu *vcpu)
{
/*
* We don't need to do this for VHE since the host kernel runs in EL2
* with HCR_EL2.TGE ==1, which makes those bits have no impact.
*/
if (!has_vhe()) {
u64 val;
u64 val;
/* Allow physical timer/counter access for the host */
val = read_sysreg(cnthctl_el2);
val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
write_sysreg(val, cnthctl_el2);
}
/* Allow physical timer/counter access for the host */
val = read_sysreg(cnthctl_el2);
val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
write_sysreg(val, cnthctl_el2);
}
/*
* Should only be called on non-VHE systems.
* VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
*/
void __hyp_text __timer_enable_traps(struct kvm_vcpu *vcpu)
{
if (!has_vhe()) {
u64 val;
u64 val;
/*
* Disallow physical timer access for the guest
* Physical counter access is allowed
*/
val = read_sysreg(cnthctl_el2);
val &= ~CNTHCTL_EL1PCEN;
val |= CNTHCTL_EL1PCTEN;
write_sysreg(val, cnthctl_el2);
}
/*
* Disallow physical timer access for the guest
* Physical counter access is allowed
*/
val = read_sysreg(cnthctl_el2);
val &= ~CNTHCTL_EL1PCEN;
val |= CNTHCTL_EL1PCTEN;
write_sysreg(val, cnthctl_el2);
}