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KVM: arm64: Route SEAs to the SError vector when EASE is set

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One of the finest additions of FEAT_DoubleFault2 is the ability for
software to request *synchronous* external aborts be taken to the
SError vector, which of coure are *asynchronous* in nature.

Opinions be damned, implement the architecture and send SEAs to the
SError vector if EASE is set for the target context.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250708172532.1699409-18-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton
2025-07-08 10:25:22 -07:00
parent 178ec0ae35
commit fff97df2a0
3 changed files with 46 additions and 2 deletions
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4
arch/arm64/kvm/emulate-nested.c
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@@ -2834,6 +2834,10 @@ int kvm_inject_nested_sea(struct kvm_vcpu *vcpu, bool iabt, u64 addr)
esr |= ESR_ELx_FSC_EXTABT | ESR_ELx_IL;
vcpu_write_sys_reg(vcpu, FAR_EL2, addr);
if (__vcpu_sys_reg(vcpu, SCTLR2_EL2) & SCTLR2_EL1_EASE)
return kvm_inject_nested(vcpu, esr, except_type_serror);
return kvm_inject_nested_sync(vcpu, esr);
}