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ANDROID: KVM: arm64: Allow trap handling from pKVM modules

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Introduce a new default trap handler for the host that can be set
from modules.

Bug: 244543039
Bug: 245034629
Change-Id: Iaabfa44f5f2c41af51f36ed4eec8762e7c951c01
Signed-off-by: Quentin Perret <qperret@google.com>
This commit is contained in:
Quentin Perret 2022-12-07 14:54:43 +00:00
parent 2829c60588
commit 00fca26bd7
4 changed files with 10 additions and 1 deletions
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1
arch/arm64/include/asm/kvm_pkvm_module.h
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@ -27,6 +27,7 @@ struct pkvm_module_ops {
int (*register_host_perm_fault_handler)(int (*cb)(struct kvm_cpu_context *ctxt, u64 esr, u64 addr));
int (*protect_host_page)(u64 pfn, enum kvm_pgtable_prot prot);
int (*register_host_smc_handler)(bool (*cb)(struct kvm_cpu_context *));
int (*register_default_trap_handler)(bool (*cb)(struct kvm_cpu_context *));
int (*register_illegal_abt_notifier)(void (*cb)(struct kvm_cpu_context *));
int (*register_psci_notifier)(void (*cb)(enum pkvm_psci_notification, struct kvm_cpu_context *));
};

1
arch/arm64/kvm/hyp/include/nvhe/modules.h
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@ -4,6 +4,7 @@
#define HCALL_UNHANDLED -1
int __pkvm_register_host_smc_handler(bool (*cb)(struct kvm_cpu_context *));
int __pkvm_register_default_trap_handler(bool (*cb)(struct kvm_cpu_context *));
int __pkvm_register_illegal_abt_notifier(void (*cb)(struct kvm_cpu_context *));
enum pkvm_psci_notification;

8
arch/arm64/kvm/hyp/nvhe/hyp-main.c
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@ -41,12 +41,18 @@ DEFINE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
void __kvm_hyp_host_forward_smc(struct kvm_cpu_context *host_ctxt);
static bool (*default_host_smc_handler)(struct kvm_cpu_context *host_ctxt);
static bool (*default_trap_handler)(struct kvm_cpu_context *host_ctxt);
int __pkvm_register_host_smc_handler(bool (*cb)(struct kvm_cpu_context *))
{
return cmpxchg(&default_host_smc_handler, NULL, cb) ? -EBUSY : 0;
}
int __pkvm_register_default_trap_handler(bool (*cb)(struct kvm_cpu_context *))
{
return cmpxchg(&default_trap_handler, NULL, cb) ? -EBUSY : 0;
}
static int pkvm_refill_memcache(struct pkvm_hyp_vcpu *hyp_vcpu)
{
struct pkvm_hyp_vm *hyp_vm = pkvm_hyp_vcpu_to_hyp_vm(hyp_vcpu);
@ -1326,6 +1332,6 @@ void handle_trap(struct kvm_cpu_context *host_ctxt)
handle_host_mem_abort(host_ctxt);
break;
default:
BUG();
BUG_ON(!READ_ONCE(default_trap_handler) || !default_trap_handler(host_ctxt));
}
}

1
arch/arm64/kvm/hyp/nvhe/modules.c
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@ -64,6 +64,7 @@ const struct pkvm_module_ops module_ops = {
.register_host_perm_fault_handler = hyp_register_host_perm_fault_handler,
.protect_host_page = hyp_protect_host_page,
.register_host_smc_handler = __pkvm_register_host_smc_handler,
.register_default_trap_handler = __pkvm_register_default_trap_handler,
.register_illegal_abt_notifier = __pkvm_register_illegal_abt_notifier,
.register_psci_notifier = __pkvm_register_psci_notifier,
};