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KVM: arm/arm64: Add kvm_vcpu_load_sysregs and kvm_vcpu_put_sysregs

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As we are about to move a bunch of save/restore logic for VHE kernels to
the load and put functions, we need some infrastructure to do this.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.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 2017-10-10 10:21:18 +02:00 committed by Marc Zyngier
parent 3df59d8dd3
commit bc192ceec3
4 changed files with 38 additions and 0 deletions
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3
arch/arm/include/asm/kvm_host.h
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@ -312,4 +312,7 @@ static inline bool kvm_arm_harden_branch_predictor(void)
return false;
}
static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
#endif /* __ARM_KVM_HOST_H__ */

3
arch/arm64/include/asm/kvm_host.h
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@ -435,4 +435,7 @@ static inline bool kvm_arm_harden_branch_predictor(void)
return cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR);
}
void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu);
void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu);
#endif /* __ARM64_KVM_HOST_H__ */

30
arch/arm64/kvm/hyp/sysreg-sr.c
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@ -190,6 +190,36 @@ void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
}
/**
* kvm_vcpu_load_sysregs - Load guest system registers to the physical CPU
*
* @vcpu: The VCPU pointer
*
* Load system registers that do not affect the host's execution, for
* example EL1 system registers on a VHE system where the host kernel
* runs at EL2. This function is called from KVM's vcpu_load() function
* and loading system register state early avoids having to load them on
* every entry to the VM.
*/
void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu)
{
}
/**
* kvm_vcpu_put_sysregs - Restore host system registers to the physical CPU
*
* @vcpu: The VCPU pointer
*
* Save guest system registers that do not affect the host's execution, for
* example EL1 system registers on a VHE system where the host kernel
* runs at EL2. This function is called from KVM's vcpu_put() function
* and deferring saving system register state until we're no longer running the
* VCPU avoids having to save them on every exit from the VM.
*/
void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu)
{
}
void __hyp_text __kvm_set_tpidr_el2(u64 tpidr_el2)
{
asm("msr tpidr_el2, %0": : "r" (tpidr_el2));

2
virt/kvm/arm/arm.c
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@ -362,10 +362,12 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
kvm_arm_set_running_vcpu(vcpu);
kvm_vgic_load(vcpu);
kvm_timer_vcpu_load(vcpu);
kvm_vcpu_load_sysregs(vcpu);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
kvm_vcpu_put_sysregs(vcpu);
kvm_timer_vcpu_put(vcpu);
kvm_vgic_put(vcpu);