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KVM: arm64: Add helper to identify a nested context

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A common idiom in the KVM code is to check if we are currently
dealing with a "nested" context, defined as having NV enabled,
but being in the EL1&0 translation regime.

This is usually expressed as:

	if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu) ... )

which is a mouthful and a bit hard to read, specially when followed
by additional conditions.

Introduce a new helper that encapsulate these two terms, allowing
the above to be written as

	if (is_nested_context(vcpu) ... )

which is both shorter and easier to read, and makes more obvious
the potential for simplification on some code paths.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250708172532.1699409-4-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier
2025-07-08 10:25:08 -07:00
committed by Oliver Upton
parent e3fd66620f
commit 1d6fea7663
8 changed files with 22 additions and 28 deletions
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9
arch/arm64/kvm/emulate-nested.c
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@@ -2592,13 +2592,8 @@ inject:
static bool __forward_traps(struct kvm_vcpu *vcpu, unsigned int reg, u64 control_bit)
{
bool control_bit_set;
if (!vcpu_has_nv(vcpu))
return false;
control_bit_set = __vcpu_sys_reg(vcpu, reg) & control_bit;
if (!is_hyp_ctxt(vcpu) && control_bit_set) {
if (is_nested_ctxt(vcpu) &&
(__vcpu_sys_reg(vcpu, reg) & control_bit)) {
kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu));
return true;
}