1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright © 2020 Amazon.com, Inc. or its affiliates.
7 * Userspace hypercall testing
10 #include "test_util.h"
12 #include "processor.h"
16 #define HCALL_REGION_GPA 0xc0000000ULL
17 #define HCALL_REGION_SLOT 10
18 #define PAGE_SIZE 4096
20 static struct kvm_vm *vm;
23 #define ARGVALUE(x) (0xdeadbeef5a5a0000UL + x)
24 #define RETVALUE 0xcafef00dfbfbffffUL
26 #define XEN_HYPERCALL_MSR 0x40000200
27 #define HV_GUEST_OS_ID_MSR 0x40000000
28 #define HV_HYPERCALL_MSR 0x40000001
30 #define HVCALL_SIGNAL_EVENT 0x005d
31 #define HV_STATUS_INVALID_ALIGNMENT 4
33 static void guest_code(void)
35 unsigned long rax = INPUTVALUE;
36 unsigned long rdi = ARGVALUE(1);
37 unsigned long rsi = ARGVALUE(2);
38 unsigned long rdx = ARGVALUE(3);
40 register unsigned long r10 __asm__("r10") = ARGVALUE(4);
41 register unsigned long r8 __asm__("r8") = ARGVALUE(5);
42 register unsigned long r9 __asm__("r9") = ARGVALUE(6);
44 /* First a direct invocation of 'vmcall' */
45 __asm__ __volatile__("vmcall" :
47 "a"(rax), "D"(rdi), "S"(rsi), "d"(rdx),
48 "r"(r10), "r"(r8), "r"(r9));
49 GUEST_ASSERT(rax == RETVALUE);
51 /* Fill in the Xen hypercall page */
52 __asm__ __volatile__("wrmsr" : : "c" (XEN_HYPERCALL_MSR),
53 "a" (HCALL_REGION_GPA & 0xffffffff),
54 "d" (HCALL_REGION_GPA >> 32));
56 /* Set Hyper-V Guest OS ID */
57 __asm__ __volatile__("wrmsr" : : "c" (HV_GUEST_OS_ID_MSR),
60 /* Hyper-V hypercall page */
61 u64 msrval = HCALL_REGION_GPA + PAGE_SIZE + 1;
62 __asm__ __volatile__("wrmsr" : : "c" (HV_HYPERCALL_MSR),
63 "a" (msrval & 0xffffffff),
66 /* Invoke a Xen hypercall */
67 __asm__ __volatile__("call *%1" : "=a"(rax) :
68 "r"(HCALL_REGION_GPA + INPUTVALUE * 32),
69 "a"(rax), "D"(rdi), "S"(rsi), "d"(rdx),
70 "r"(r10), "r"(r8), "r"(r9));
71 GUEST_ASSERT(rax == RETVALUE);
73 /* Invoke a Hyper-V hypercall */
75 rcx = HVCALL_SIGNAL_EVENT; /* code */
76 rdx = 0x5a5a5a5a; /* ingpa (badly aligned) */
77 __asm__ __volatile__("call *%1" : "=a"(rax) :
78 "r"(HCALL_REGION_GPA + PAGE_SIZE),
79 "a"(rax), "c"(rcx), "d"(rdx),
81 GUEST_ASSERT(rax == HV_STATUS_INVALID_ALIGNMENT);
86 int main(int argc, char *argv[])
88 if (!(kvm_check_cap(KVM_CAP_XEN_HVM) &
89 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL) ) {
90 print_skip("KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL not available");
94 vm = vm_create_default(VCPU_ID, 0, (void *) guest_code);
95 vcpu_set_hv_cpuid(vm, VCPU_ID);
97 struct kvm_xen_hvm_config hvmc = {
98 .flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL,
99 .msr = XEN_HYPERCALL_MSR,
101 vm_ioctl(vm, KVM_XEN_HVM_CONFIG, &hvmc);
103 /* Map a region for the hypercall pages */
104 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
105 HCALL_REGION_GPA, HCALL_REGION_SLOT, 2, 0);
106 virt_map(vm, HCALL_REGION_GPA, HCALL_REGION_GPA, 2);
109 volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
112 vcpu_run(vm, VCPU_ID);
114 if (run->exit_reason == KVM_EXIT_XEN) {
115 ASSERT_EQ(run->xen.type, KVM_EXIT_XEN_HCALL);
116 ASSERT_EQ(run->xen.u.hcall.cpl, 0);
117 ASSERT_EQ(run->xen.u.hcall.longmode, 1);
118 ASSERT_EQ(run->xen.u.hcall.input, INPUTVALUE);
119 ASSERT_EQ(run->xen.u.hcall.params[0], ARGVALUE(1));
120 ASSERT_EQ(run->xen.u.hcall.params[1], ARGVALUE(2));
121 ASSERT_EQ(run->xen.u.hcall.params[2], ARGVALUE(3));
122 ASSERT_EQ(run->xen.u.hcall.params[3], ARGVALUE(4));
123 ASSERT_EQ(run->xen.u.hcall.params[4], ARGVALUE(5));
124 ASSERT_EQ(run->xen.u.hcall.params[5], ARGVALUE(6));
125 run->xen.u.hcall.result = RETVALUE;
129 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
130 "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
132 exit_reason_str(run->exit_reason));
134 switch (get_ucall(vm, VCPU_ID, &uc)) {
136 TEST_FAIL("%s", (const char *)uc.args[0]);
143 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);