Re: [PATCH] KVM: arm64: selftests: Check ID regs are immutable after a failed run

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On Tue, Aug 04, 2026 at 10:24:21AM +0100, Fuad Tabba wrote:
> Add a set_id_regs case covering ID register immutability when a vCPU's
> first KVM_RUN fails after finalization but before
> KVM_ARCH_FLAG_HAS_RAN_ONCE is set. The test provokes such a failure with
> a PMUv3-enabled vCPU whose PMU is left uninitialized, then checks that
> KVM_SET_ONE_REG on an ID register and KVM_CREATE_DEVICE for a vGIC are
> both rejected with -EBUSY.

> +	for (int i = 0; i < ARRAY_SIZE(test_regs) && !found; i++) {
> +		const struct reg_ftr_bits *ftr_bits = test_regs[i].ftr_bits;
> +
> +		reg = KVM_ARM64_SYS_REG(test_regs[i].reg);
> +		val = vcpu_get_reg(vcpu, reg);

If we're doing a focused test for the specific issue there's the VM ID
registers as well as the general ID registers and adding an irqchip.

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