Hi Christoffer,
On 01/12/2018 12:07 PM, Christoffer Dall wrote:
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@xxxxxxx>
Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
---
arch/arm64/kvm/hyp/switch.c | 2 --
virt/kvm/arm/hyp/timer-sr.c | 44 ++++++++++++++++++++++----------------------
2 files changed, 22 insertions(+), 24 deletions(-)
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 9aadef6966bf..6175fcb33ed2 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -354,7 +354,6 @@ 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
@@ -373,7 +372,6 @@ 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);
diff --git a/virt/kvm/arm/hyp/timer-sr.c b/virt/kvm/arm/hyp/timer-sr.c
index f24404b3c8df..77754a62eb0c 100644
--- a/virt/kvm/arm/hyp/timer-sr.c
+++ b/virt/kvm/arm/hyp/timer-sr.c
@@ -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)
Would it be worth to suffix the function with nvhe? So it would be clear
that it should not be called for VHE system?
{
- /*
- * 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)
Same here.
{
- 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);
}
Cheers,
--
Julien Grall
