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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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2
arch/arm64/kvm/arch_timer.c
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@@ -830,7 +830,7 @@ static void timer_set_traps(struct kvm_vcpu *vcpu, struct timer_map *map)
* by the guest (either FEAT_VHE or FEAT_E2H0 is implemented, but
* not both). This simplifies the handling of the EL1NV* bits.
*/
if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu)) {
if (is_nested_ctxt(vcpu)) {
u64 val = __vcpu_sys_reg(vcpu, CNTHCTL_EL2);
/* Use the VHE format for mental sanity */