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KVM: arm64: Add {get,put}_pkvm_hyp_vm() helpers

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In preparation for accessing pkvm_hyp_vm structures at EL2 in a context
where we can't always expect a vCPU to be loaded (e.g. MMU notifiers),
introduce get/put helpers to get temporary references to hyp VMs from
any context.

Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20241218194059.3670226-9-qperret@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Quentin Perret
2024-12-18 19:40:49 +00:00
committed by Marc Zyngier
parent c77e5181fe
commit 99996d575e
2 changed files with 23 additions and 0 deletions
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3
arch/arm64/kvm/hyp/include/nvhe/pkvm.h
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@@ -70,4 +70,7 @@ struct pkvm_hyp_vcpu *pkvm_load_hyp_vcpu(pkvm_handle_t handle,
unsigned int vcpu_idx);
void pkvm_put_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu);
struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle);
void put_pkvm_hyp_vm(struct pkvm_hyp_vm *hyp_vm);
#endif /* __ARM64_KVM_NVHE_PKVM_H__ */

20
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@@ -327,6 +327,26 @@ void pkvm_put_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
hyp_spin_unlock(&vm_table_lock);
}
struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle)
{
struct pkvm_hyp_vm *hyp_vm;
hyp_spin_lock(&vm_table_lock);
hyp_vm = get_vm_by_handle(handle);
if (hyp_vm)
hyp_page_ref_inc(hyp_virt_to_page(hyp_vm));
hyp_spin_unlock(&vm_table_lock);
return hyp_vm;
}
void put_pkvm_hyp_vm(struct pkvm_hyp_vm *hyp_vm)
{
hyp_spin_lock(&vm_table_lock);
hyp_page_ref_dec(hyp_virt_to_page(hyp_vm));
hyp_spin_unlock(&vm_table_lock);
}
static void pkvm_init_features_from_host(struct pkvm_hyp_vm *hyp_vm, const struct kvm *host_kvm)
{
struct kvm *kvm = &hyp_vm->kvm;