xref: /linux/tools/testing/selftests/kvm/x86/hyperv_cpuid.c (revision 67730e6c53d70fb31618230f81c4acee9f72eaa3)
1*67730e6cSSean Christopherson // SPDX-License-Identifier: GPL-2.0
2*67730e6cSSean Christopherson /*
3*67730e6cSSean Christopherson  * Test for x86 KVM_CAP_HYPERV_CPUID
4*67730e6cSSean Christopherson  *
5*67730e6cSSean Christopherson  * Copyright (C) 2018, Red Hat, Inc.
6*67730e6cSSean Christopherson  *
7*67730e6cSSean Christopherson  * This work is licensed under the terms of the GNU GPL, version 2.
8*67730e6cSSean Christopherson  *
9*67730e6cSSean Christopherson  */
10*67730e6cSSean Christopherson #include <fcntl.h>
11*67730e6cSSean Christopherson #include <stdio.h>
12*67730e6cSSean Christopherson #include <stdlib.h>
13*67730e6cSSean Christopherson #include <string.h>
14*67730e6cSSean Christopherson #include <sys/ioctl.h>
15*67730e6cSSean Christopherson 
16*67730e6cSSean Christopherson #include "test_util.h"
17*67730e6cSSean Christopherson #include "kvm_util.h"
18*67730e6cSSean Christopherson #include "processor.h"
19*67730e6cSSean Christopherson #include "vmx.h"
20*67730e6cSSean Christopherson 
21*67730e6cSSean Christopherson static void guest_code(void)
22*67730e6cSSean Christopherson {
23*67730e6cSSean Christopherson }
24*67730e6cSSean Christopherson 
25*67730e6cSSean Christopherson static bool smt_possible(void)
26*67730e6cSSean Christopherson {
27*67730e6cSSean Christopherson 	char buf[16];
28*67730e6cSSean Christopherson 	FILE *f;
29*67730e6cSSean Christopherson 	bool res = true;
30*67730e6cSSean Christopherson 
31*67730e6cSSean Christopherson 	f = fopen("/sys/devices/system/cpu/smt/control", "r");
32*67730e6cSSean Christopherson 	if (f) {
33*67730e6cSSean Christopherson 		if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) {
34*67730e6cSSean Christopherson 			if (!strncmp(buf, "forceoff", 8) ||
35*67730e6cSSean Christopherson 			    !strncmp(buf, "notsupported", 12))
36*67730e6cSSean Christopherson 				res = false;
37*67730e6cSSean Christopherson 		}
38*67730e6cSSean Christopherson 		fclose(f);
39*67730e6cSSean Christopherson 	}
40*67730e6cSSean Christopherson 
41*67730e6cSSean Christopherson 	return res;
42*67730e6cSSean Christopherson }
43*67730e6cSSean Christopherson 
44*67730e6cSSean Christopherson static void test_hv_cpuid(const struct kvm_cpuid2 *hv_cpuid_entries,
45*67730e6cSSean Christopherson 			  bool evmcs_expected)
46*67730e6cSSean Christopherson {
47*67730e6cSSean Christopherson 	int i;
48*67730e6cSSean Christopherson 	int nent_expected = 10;
49*67730e6cSSean Christopherson 	u32 test_val;
50*67730e6cSSean Christopherson 
51*67730e6cSSean Christopherson 	TEST_ASSERT(hv_cpuid_entries->nent == nent_expected,
52*67730e6cSSean Christopherson 		    "KVM_GET_SUPPORTED_HV_CPUID should return %d entries"
53*67730e6cSSean Christopherson 		    " (returned %d)",
54*67730e6cSSean Christopherson 		    nent_expected, hv_cpuid_entries->nent);
55*67730e6cSSean Christopherson 
56*67730e6cSSean Christopherson 	for (i = 0; i < hv_cpuid_entries->nent; i++) {
57*67730e6cSSean Christopherson 		const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
58*67730e6cSSean Christopherson 
59*67730e6cSSean Christopherson 		TEST_ASSERT((entry->function >= 0x40000000) &&
60*67730e6cSSean Christopherson 			    (entry->function <= 0x40000082),
61*67730e6cSSean Christopherson 			    "function %x is our of supported range",
62*67730e6cSSean Christopherson 			    entry->function);
63*67730e6cSSean Christopherson 
64*67730e6cSSean Christopherson 		TEST_ASSERT(entry->index == 0,
65*67730e6cSSean Christopherson 			    ".index field should be zero");
66*67730e6cSSean Christopherson 
67*67730e6cSSean Christopherson 		TEST_ASSERT(entry->flags == 0,
68*67730e6cSSean Christopherson 			    ".flags field should be zero");
69*67730e6cSSean Christopherson 
70*67730e6cSSean Christopherson 		TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
71*67730e6cSSean Christopherson 			    !entry->padding[2], "padding should be zero");
72*67730e6cSSean Christopherson 
73*67730e6cSSean Christopherson 		switch (entry->function) {
74*67730e6cSSean Christopherson 		case 0x40000000:
75*67730e6cSSean Christopherson 			test_val = 0x40000082;
76*67730e6cSSean Christopherson 
77*67730e6cSSean Christopherson 			TEST_ASSERT(entry->eax == test_val,
78*67730e6cSSean Christopherson 				    "Wrong max leaf report in 0x40000000.EAX: %x"
79*67730e6cSSean Christopherson 				    " (evmcs=%d)",
80*67730e6cSSean Christopherson 				    entry->eax, evmcs_expected
81*67730e6cSSean Christopherson 				);
82*67730e6cSSean Christopherson 			break;
83*67730e6cSSean Christopherson 		case 0x40000004:
84*67730e6cSSean Christopherson 			test_val = entry->eax & (1UL << 18);
85*67730e6cSSean Christopherson 
86*67730e6cSSean Christopherson 			TEST_ASSERT(!!test_val == !smt_possible(),
87*67730e6cSSean Christopherson 				    "NoNonArchitecturalCoreSharing bit"
88*67730e6cSSean Christopherson 				    " doesn't reflect SMT setting");
89*67730e6cSSean Christopherson 			break;
90*67730e6cSSean Christopherson 		case 0x4000000A:
91*67730e6cSSean Christopherson 			TEST_ASSERT(entry->eax & (1UL << 19),
92*67730e6cSSean Christopherson 				    "Enlightened MSR-Bitmap should always be supported"
93*67730e6cSSean Christopherson 				    " 0x40000000.EAX: %x", entry->eax);
94*67730e6cSSean Christopherson 			if (evmcs_expected)
95*67730e6cSSean Christopherson 				TEST_ASSERT((entry->eax & 0xffff) == 0x101,
96*67730e6cSSean Christopherson 				    "Supported Enlightened VMCS version range is supposed to be 1:1"
97*67730e6cSSean Christopherson 				    " 0x40000000.EAX: %x", entry->eax);
98*67730e6cSSean Christopherson 
99*67730e6cSSean Christopherson 			break;
100*67730e6cSSean Christopherson 		default:
101*67730e6cSSean Christopherson 			break;
102*67730e6cSSean Christopherson 
103*67730e6cSSean Christopherson 		}
104*67730e6cSSean Christopherson 		/*
105*67730e6cSSean Christopherson 		 * If needed for debug:
106*67730e6cSSean Christopherson 		 * fprintf(stdout,
107*67730e6cSSean Christopherson 		 *	"CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
108*67730e6cSSean Christopherson 		 *	entry->function, entry->eax, entry->ebx, entry->ecx,
109*67730e6cSSean Christopherson 		 *	entry->edx);
110*67730e6cSSean Christopherson 		 */
111*67730e6cSSean Christopherson 	}
112*67730e6cSSean Christopherson }
113*67730e6cSSean Christopherson 
114*67730e6cSSean Christopherson void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
115*67730e6cSSean Christopherson {
116*67730e6cSSean Christopherson 	static struct kvm_cpuid2 cpuid = {.nent = 0};
117*67730e6cSSean Christopherson 	int ret;
118*67730e6cSSean Christopherson 
119*67730e6cSSean Christopherson 	if (vcpu)
120*67730e6cSSean Christopherson 		ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
121*67730e6cSSean Christopherson 	else
122*67730e6cSSean Christopherson 		ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
123*67730e6cSSean Christopherson 
124*67730e6cSSean Christopherson 	TEST_ASSERT(ret == -1 && errno == E2BIG,
125*67730e6cSSean Christopherson 		    "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"
126*67730e6cSSean Christopherson 		    " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno);
127*67730e6cSSean Christopherson }
128*67730e6cSSean Christopherson 
129*67730e6cSSean Christopherson int main(int argc, char *argv[])
130*67730e6cSSean Christopherson {
131*67730e6cSSean Christopherson 	struct kvm_vm *vm;
132*67730e6cSSean Christopherson 	const struct kvm_cpuid2 *hv_cpuid_entries;
133*67730e6cSSean Christopherson 	struct kvm_vcpu *vcpu;
134*67730e6cSSean Christopherson 
135*67730e6cSSean Christopherson 	TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID));
136*67730e6cSSean Christopherson 
137*67730e6cSSean Christopherson 	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
138*67730e6cSSean Christopherson 
139*67730e6cSSean Christopherson 	/* Test vCPU ioctl version */
140*67730e6cSSean Christopherson 	test_hv_cpuid_e2big(vm, vcpu);
141*67730e6cSSean Christopherson 
142*67730e6cSSean Christopherson 	hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu);
143*67730e6cSSean Christopherson 	test_hv_cpuid(hv_cpuid_entries, false);
144*67730e6cSSean Christopherson 	free((void *)hv_cpuid_entries);
145*67730e6cSSean Christopherson 
146*67730e6cSSean Christopherson 	if (!kvm_cpu_has(X86_FEATURE_VMX) ||
147*67730e6cSSean Christopherson 	    !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
148*67730e6cSSean Christopherson 		print_skip("Enlightened VMCS is unsupported");
149*67730e6cSSean Christopherson 		goto do_sys;
150*67730e6cSSean Christopherson 	}
151*67730e6cSSean Christopherson 	vcpu_enable_evmcs(vcpu);
152*67730e6cSSean Christopherson 	hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu);
153*67730e6cSSean Christopherson 	test_hv_cpuid(hv_cpuid_entries, true);
154*67730e6cSSean Christopherson 	free((void *)hv_cpuid_entries);
155*67730e6cSSean Christopherson 
156*67730e6cSSean Christopherson do_sys:
157*67730e6cSSean Christopherson 	/* Test system ioctl version */
158*67730e6cSSean Christopherson 	if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID)) {
159*67730e6cSSean Christopherson 		print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported");
160*67730e6cSSean Christopherson 		goto out;
161*67730e6cSSean Christopherson 	}
162*67730e6cSSean Christopherson 
163*67730e6cSSean Christopherson 	test_hv_cpuid_e2big(vm, NULL);
164*67730e6cSSean Christopherson 
165*67730e6cSSean Christopherson 	hv_cpuid_entries = kvm_get_supported_hv_cpuid();
166*67730e6cSSean Christopherson 	test_hv_cpuid(hv_cpuid_entries, kvm_cpu_has(X86_FEATURE_VMX));
167*67730e6cSSean Christopherson 
168*67730e6cSSean Christopherson out:
169*67730e6cSSean Christopherson 	kvm_vm_free(vm);
170*67730e6cSSean Christopherson 
171*67730e6cSSean Christopherson 	return 0;
172*67730e6cSSean Christopherson }
173