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KVM: arm64: Convert HCR_EL2.RW to AS_RES1

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Now that we have the AS_RES1 constraint, it becomes trivial to express
the HCR_EL2.RW behaviour.

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-10-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-02-02 18:43:18 +00:00
parent c27b8b7aab
commit fb86207bdc
1 changed files with 1 additions and 14 deletions
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15
arch/arm64/kvm/config.c
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@ -389,19 +389,6 @@ static bool feat_vmid16(struct kvm *kvm)
return kvm_has_feat_enum(kvm, ID_AA64MMFR1_EL1, VMIDBits, 16);
}
static bool compute_hcr_rw(struct kvm *kvm, u64 *bits)
{
/* This is purely academic: AArch32 and NV are mutually exclusive */
if (bits) {
if (kvm_has_feat(kvm, FEAT_AA32EL1))
*bits &= ~HCR_EL2_RW;
else
*bits |= HCR_EL2_RW;
}
return true;
}
static bool compute_hcr_e2h(struct kvm *kvm, u64 *bits)
{
if (bits) {
@ -967,7 +954,7 @@ static const DECLARE_FEAT_MAP(hcrx_desc, __HCRX_EL2,
static const struct reg_bits_to_feat_map hcr_feat_map[] = {
NEEDS_FEAT(HCR_EL2_TID0, FEAT_AA32EL0),
NEEDS_FEAT_FIXED(HCR_EL2_RW, compute_hcr_rw),
NEEDS_FEAT_FLAG(HCR_EL2_RW, AS_RES1, FEAT_AA32EL1),
NEEDS_FEAT(HCR_EL2_HCD, not_feat_aa64el3),
NEEDS_FEAT(HCR_EL2_AMO |
HCR_EL2_BSU |