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KVM: arm64: Introduce separate VHE/non-VHE sysreg save/restore functions

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As we are about to handle system registers quite differently between VHE
and non-VHE systems.  In preparation for that, we need to split some of
the handling functions between VHE and non-VHE functionality.

For now, we simply copy the non-VHE functions, but we do change the use
of static keys for VHE and non-VHE functionality now that we have
separate functions.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-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 22:19:31 +02:00 committed by Marc Zyngier
parent 2b88104467
commit f837453d0e
3 changed files with 50 additions and 22 deletions
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12
arch/arm64/include/asm/kvm_hyp.h
View File

@ -131,10 +131,14 @@ int __vgic_v3_perform_cpuif_access(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);
void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
void __sysreg_save_host_state_nvhe(struct kvm_cpu_context *ctxt);
void __sysreg_restore_host_state_nvhe(struct kvm_cpu_context *ctxt);
void __sysreg_save_guest_state_nvhe(struct kvm_cpu_context *ctxt);
void __sysreg_restore_guest_state_nvhe(struct kvm_cpu_context *ctxt);
void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
void __sysreg32_save_state(struct kvm_vcpu *vcpu);
void __sysreg32_restore_state(struct kvm_vcpu *vcpu);

20
arch/arm64/kvm/hyp/switch.c
View File

@ -373,7 +373,7 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
host_ctxt->__hyp_running_vcpu = vcpu;
guest_ctxt = &vcpu->arch.ctxt;
__sysreg_save_host_state(host_ctxt);
sysreg_save_host_state_vhe(host_ctxt);
__activate_traps(vcpu);
__activate_vm(vcpu->kvm);
@ -385,7 +385,7 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
* to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72).
*/
__sysreg32_restore_state(vcpu);
__sysreg_restore_guest_state(guest_ctxt);
sysreg_restore_guest_state_vhe(guest_ctxt);
__debug_switch_to_guest(vcpu);
do {
@ -397,13 +397,13 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
fp_enabled = __fpsimd_enabled();
__sysreg_save_guest_state(guest_ctxt);
sysreg_save_guest_state_vhe(guest_ctxt);
__sysreg32_save_state(vcpu);
__vgic_save_state(vcpu);
__deactivate_traps(vcpu);
__sysreg_restore_host_state(host_ctxt);
sysreg_restore_host_state_vhe(host_ctxt);
if (fp_enabled) {
__fpsimd_save_state(&guest_ctxt->gp_regs.fp_regs);
@ -433,7 +433,7 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
host_ctxt->__hyp_running_vcpu = vcpu;
guest_ctxt = &vcpu->arch.ctxt;
__sysreg_save_host_state(host_ctxt);
__sysreg_save_host_state_nvhe(host_ctxt);
__activate_traps(vcpu);
__activate_vm(kern_hyp_va(vcpu->kvm));
@ -446,7 +446,7 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
* to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72).
*/
__sysreg32_restore_state(vcpu);
__sysreg_restore_guest_state(guest_ctxt);
__sysreg_restore_guest_state_nvhe(guest_ctxt);
__debug_switch_to_guest(vcpu);
do {
@ -468,7 +468,7 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
fp_enabled = __fpsimd_enabled();
__sysreg_save_guest_state(guest_ctxt);
__sysreg_save_guest_state_nvhe(guest_ctxt);
__sysreg32_save_state(vcpu);
__timer_disable_traps(vcpu);
__vgic_save_state(vcpu);
@ -476,7 +476,7 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
__deactivate_traps(vcpu);
__deactivate_vm(vcpu);
__sysreg_restore_host_state(host_ctxt);
__sysreg_restore_host_state_nvhe(host_ctxt);
if (fp_enabled) {
__fpsimd_save_state(&guest_ctxt->gp_regs.fp_regs);
@ -506,7 +506,7 @@ static void __hyp_text __hyp_call_panic_nvhe(u64 spsr, u64 elr, u64 par,
__timer_disable_traps(vcpu);
__deactivate_traps(vcpu);
__deactivate_vm(vcpu);
__sysreg_restore_host_state(__host_ctxt);
__sysreg_restore_host_state_nvhe(__host_ctxt);
}
/*
@ -529,7 +529,7 @@ static void __hyp_call_panic_vhe(u64 spsr, u64 elr, u64 par,
vcpu = host_ctxt->__hyp_running_vcpu;
__deactivate_traps(vcpu);
__sysreg_restore_host_state(host_ctxt);
sysreg_restore_host_state_vhe(host_ctxt);
panic(__hyp_panic_string,
spsr, elr,

40
arch/arm64/kvm/hyp/sysreg-sr.c
View File

@ -78,15 +78,27 @@ static void __hyp_text __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
ctxt->sys_regs[DISR_EL1] = read_sysreg_s(SYS_VDISR_EL2);
}
void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt)
void __hyp_text __sysreg_save_host_state_nvhe(struct kvm_cpu_context *ctxt)
{
if (!has_vhe())
__sysreg_save_el1_state(ctxt);
__sysreg_save_el1_state(ctxt);
__sysreg_save_common_state(ctxt);
__sysreg_save_user_state(ctxt);
}
void __hyp_text __sysreg_save_guest_state(struct kvm_cpu_context *ctxt)
void __hyp_text __sysreg_save_guest_state_nvhe(struct kvm_cpu_context *ctxt)
{
__sysreg_save_el1_state(ctxt);
__sysreg_save_common_state(ctxt);
__sysreg_save_user_state(ctxt);
}
void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt)
{
__sysreg_save_common_state(ctxt);
__sysreg_save_user_state(ctxt);
}
void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt)
{
__sysreg_save_el1_state(ctxt);
__sysreg_save_common_state(ctxt);
@ -142,15 +154,27 @@ static void __hyp_text __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
write_sysreg_s(ctxt->sys_regs[DISR_EL1], SYS_VDISR_EL2);
}
void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt)
void __hyp_text __sysreg_restore_host_state_nvhe(struct kvm_cpu_context *ctxt)
{
if (!has_vhe())
__sysreg_restore_el1_state(ctxt);
__sysreg_restore_el1_state(ctxt);
__sysreg_restore_common_state(ctxt);
__sysreg_restore_user_state(ctxt);
}
void __hyp_text __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt)
void __hyp_text __sysreg_restore_guest_state_nvhe(struct kvm_cpu_context *ctxt)
{
__sysreg_restore_el1_state(ctxt);
__sysreg_restore_common_state(ctxt);
__sysreg_restore_user_state(ctxt);
}
void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt)
{
__sysreg_restore_common_state(ctxt);
__sysreg_restore_user_state(ctxt);
}
void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt)
{
__sysreg_restore_el1_state(ctxt);
__sysreg_restore_common_state(ctxt);