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d72543ac72
HVCs are taken within the VM when EL2 is in use. Ensure tests use the SMC instruction when running at EL2 to interact with the host. Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Check that nobody has tampered with KVM's UID
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#include <errno.h>
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#include <linux/arm-smccc.h>
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#include <asm/kvm.h>
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#include <kvm_util.h>
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#include "processor.h"
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/*
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* Do NOT redefine these constants, or try to replace them with some
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* "common" version. They are hardcoded here to detect any potential
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* breakage happening in the rest of the kernel.
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*
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* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74
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*/
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#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U
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#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU
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#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U
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#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU
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static void guest_code(void)
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{
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struct arm_smccc_res res = {};
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do_smccc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, 0, 0, 0, 0, 0, 0, 0, &res);
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__GUEST_ASSERT(res.a0 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 &&
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res.a1 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 &&
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res.a2 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 &&
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res.a3 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3,
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"Unexpected KVM-specific UID %lx %lx %lx %lx\n", res.a0, res.a1, res.a2, res.a3);
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GUEST_DONE();
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}
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int main (int argc, char *argv[])
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vm *vm;
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struct ucall uc;
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bool guest_done = false;
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vm = vm_create_with_one_vcpu(&vcpu, guest_code);
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while (!guest_done) {
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vcpu_run(vcpu);
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switch (get_ucall(vcpu, &uc)) {
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case UCALL_SYNC:
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break;
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case UCALL_DONE:
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guest_done = true;
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break;
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case UCALL_ABORT:
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REPORT_GUEST_ASSERT(uc);
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break;
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case UCALL_PRINTF:
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printf("%s", uc.buffer);
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break;
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default:
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TEST_FAIL("Unexpected guest exit");
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}
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}
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kvm_vm_free(vm);
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return 0;
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}
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