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KVM: arm64: Simplify handling of HCR_EL2.E2H RESx

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Now that we can link the RESx behaviour with the value of HCR_EL2.E2H,
we can trivially express the tautological constraint that makes E2H
a reserved value at all times.

Fun, isn't it?

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-15-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-02-02 18:43:23 +00:00
parent d2f629aa75
commit f01e3429cf
1 changed files with 1 additions and 11 deletions
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12
arch/arm64/kvm/config.c
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@ -388,16 +388,6 @@ static bool feat_vmid16(struct kvm *kvm)
return kvm_has_feat_enum(kvm, ID_AA64MMFR1_EL1, VMIDBits, 16);
}
static bool compute_hcr_e2h(struct kvm *kvm, struct resx *bits)
{
if (kvm_has_feat(kvm, FEAT_E2H0))
bits->res0 |= HCR_EL2_E2H;
else
bits->res1 |= HCR_EL2_E2H;
return true;
}
static const struct reg_bits_to_feat_map hfgrtr_feat_map[] = {
NEEDS_FEAT(HFGRTR_EL2_nAMAIR2_EL1 |
HFGRTR_EL2_nMAIR2_EL1,
@ -1017,7 +1007,7 @@ static const struct reg_bits_to_feat_map hcr_feat_map[] = {
NEEDS_FEAT(HCR_EL2_TWEDEL |
HCR_EL2_TWEDEn,
FEAT_TWED),
NEEDS_FEAT_FIXED(HCR_EL2_E2H, compute_hcr_e2h),
NEEDS_FEAT_FLAG(HCR_EL2_E2H, RES1_WHEN_E2H1 | FORCE_RESx),
FORCE_RES0(HCR_EL2_RES0),
FORCE_RES1(HCR_EL2_RES1),
};