diff options
| author | Christoffer Dall <cdall@linaro.org> | 2017-01-04 18:10:28 +0300 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2017-11-06 18:23:13 +0300 |
| commit | 688c50aa72f64ca21767486e5eef876ec23e418c (patch) | |
| tree | e5e2b86ee875d005308f7540692d5373eba7605f /arch/arm64/include/asm/kvm_hyp.h | |
| parent | f2a2129e0ac8d8fa79c3f85425c36f6e3368f022 (diff) | |
| download | linux-688c50aa72f64ca21767486e5eef876ec23e418c.tar.xz | |
KVM: arm/arm64: Move timer save/restore out of the hyp code
As we are about to be lazy with saving and restoring the timer
registers, we prepare by moving all possible timer configuration logic
out of the hyp code. All virtual timer registers can be programmed from
EL1 and since the arch timer is always a level triggered interrupt we
can safely do this with interrupts disabled in the host kernel on the
way to the guest without taking vtimer interrupts in the host kernel
(yet).
The downside is that the cntvoff register can only be programmed from
hyp mode, so we jump into hyp mode and back to program it. This is also
safe, because the host kernel doesn't use the virtual timer in the KVM
code. It may add a little performance performance penalty, but only
until following commits where we move this operation to vcpu load/put.
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/kvm_hyp.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_hyp.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index 4572a9b560fa..08d3bb66c8b7 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -129,8 +129,8 @@ void __vgic_v3_save_state(struct kvm_vcpu *vcpu); void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu); -void __timer_save_state(struct kvm_vcpu *vcpu); -void __timer_restore_state(struct kvm_vcpu *vcpu); +void __timer_enable_traps(struct kvm_vcpu *vcpu); +void __timer_disable_traps(struct kvm_vcpu *vcpu); void __sysreg_save_host_state(struct kvm_cpu_context *ctxt); void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt); |