Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2
3// Check that nobody has tampered with KVM's UID
4
5#include <errno.h>
6#include <linux/arm-smccc.h>
7#include <asm/kvm.h>
8#include <kvm_util.h>
9
10#include "processor.h"
11
12/*
13 * Do NOT redefine these constants, or try to replace them with some
14 * "common" version. They are hardcoded here to detect any potential
15 * breakage happening in the rest of the kernel.
16 *
17 * KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74
18 */
19#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U
20#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU
21#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U
22#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU
23
24static void guest_code(void)
25{
26 struct arm_smccc_res res = {};
27
28 do_smccc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, 0, 0, 0, 0, 0, 0, 0, &res);
29
30 __GUEST_ASSERT(res.a0 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 &&
31 res.a1 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 &&
32 res.a2 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 &&
33 res.a3 == ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3,
34 "Unexpected KVM-specific UID %lx %lx %lx %lx\n", res.a0, res.a1, res.a2, res.a3);
35 GUEST_DONE();
36}
37
38int main (int argc, char *argv[])
39{
40 struct kvm_vcpu *vcpu;
41 struct kvm_vm *vm;
42 struct ucall uc;
43 bool guest_done = false;
44
45 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
46
47 while (!guest_done) {
48 vcpu_run(vcpu);
49
50 switch (get_ucall(vcpu, &uc)) {
51 case UCALL_SYNC:
52 break;
53 case UCALL_DONE:
54 guest_done = true;
55 break;
56 case UCALL_ABORT:
57 REPORT_GUEST_ASSERT(uc);
58 break;
59 case UCALL_PRINTF:
60 printf("%s", uc.buffer);
61 break;
62 default:
63 TEST_FAIL("Unexpected guest exit");
64 }
65 }
66
67 kvm_vm_free(vm);
68
69 return 0;
70}