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KVM: arm64: Reject 32bit user PSTATE on asymmetric systems
KVM does not support AArch32 EL0 on asymmetric systems. To that end, prevent userspace from configuring a vCPU in such a state through setting PSTATE. It is already ABI that KVM rejects such a write on a system where AArch32 EL0 is unsupported. Though the kernel's definition of a 32bit system changed in commit2122a83331
("arm64: Allow mismatched 32-bit EL0 support"), KVM's did not. Fixes:2122a83331
("arm64: Allow mismatched 32-bit EL0 support") Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220816192554.1455559-3-oliver.upton@linux.dev
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@ -242,7 +242,7 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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u64 mode = (*(u64 *)valp) & PSR_AA32_MODE_MASK;
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switch (mode) {
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case PSR_AA32_MODE_USR:
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if (!system_supports_32bit_el0())
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if (!kvm_supports_32bit_el0())
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return -EINVAL;
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break;
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case PSR_AA32_MODE_FIQ:
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