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KVM: arm64: Return early from trace helpers when KVM isn't available

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When Linux is booted at EL1, host_data_ptr() resolves to the nVHE
hypervisor's copy of host data. When hyp mode isn't available for
KVM the nVHE percpu bases remain uninitialized. Consequently, any usage
of host_data_ptr() will result in a NULL dereference which has been
observed in KVM's trace filtering helpers.

Add an early return to the trace filtering helpers if KVM isn't
initialized, avoiding the NULL dereference. Take this opportunity
to move the TRBE-skipping checks to a common helper.

Fixes: 054b88391b ("KVM: arm64: Support trace filtering for guests")
Signed-off-by: Yingchao Deng <yingchao.deng@oss.qualcomm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
[maz: repainted the helpers to be readable, and the commit message
 with Oliver's suggestion]
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Yingchao Deng
2025-09-02 11:48:25 +08:00
committed by Marc Zyngier
parent 2ba972bf71
commit 27d2b47eef
1 changed files with 11 additions and 11 deletions
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arch/arm64/kvm/debug.c
+11 -11
View File
@@ -230,29 +230,29 @@ void kvm_debug_handle_oslar(struct kvm_vcpu *vcpu, u64 val)
preempt_enable();
}
static bool skip_trbe_access(bool skip_condition)
{
return (WARN_ON_ONCE(preemptible()) || skip_condition ||
is_protected_kvm_enabled() || !is_kvm_arm_initialised());
}
void kvm_enable_trbe(void)
{
if (has_vhe() || is_protected_kvm_enabled() ||
WARN_ON_ONCE(preemptible()))
return;
host_data_set_flag(TRBE_ENABLED);
if (!skip_trbe_access(has_vhe()))
host_data_set_flag(TRBE_ENABLED);
}
EXPORT_SYMBOL_GPL(kvm_enable_trbe);
void kvm_disable_trbe(void)
{
if (has_vhe() || is_protected_kvm_enabled() ||
WARN_ON_ONCE(preemptible()))
return;
host_data_clear_flag(TRBE_ENABLED);
if (!skip_trbe_access(has_vhe()))
host_data_clear_flag(TRBE_ENABLED);
}
EXPORT_SYMBOL_GPL(kvm_disable_trbe);
void kvm_tracing_set_el1_configuration(u64 trfcr_while_in_guest)
{
if (is_protected_kvm_enabled() || WARN_ON_ONCE(preemptible()))
if (skip_trbe_access(false))
return;
if (has_vhe()) {