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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | // SPDX-License-Identifier: GPL-2.0-only /* * xen_vmcall_test * * Copyright © 2020 Amazon.com, Inc. or its affiliates. * * Userspace hypercall testing */ #include "test_util.h" #include "kvm_util.h" #include "processor.h" #define HCALL_REGION_GPA 0xc0000000ULL #define HCALL_REGION_SLOT 10 #define INPUTVALUE 17 #define ARGVALUE(x) (0xdeadbeef5a5a0000UL + x) #define RETVALUE 0xcafef00dfbfbffffUL #define XEN_HYPERCALL_MSR 0x40000200 #define HV_GUEST_OS_ID_MSR 0x40000000 #define HV_HYPERCALL_MSR 0x40000001 #define HVCALL_SIGNAL_EVENT 0x005d #define HV_STATUS_INVALID_ALIGNMENT 4 static void guest_code(void) { unsigned long rax = INPUTVALUE; unsigned long rdi = ARGVALUE(1); unsigned long rsi = ARGVALUE(2); unsigned long rdx = ARGVALUE(3); unsigned long rcx; register unsigned long r10 __asm__("r10") = ARGVALUE(4); register unsigned long r8 __asm__("r8") = ARGVALUE(5); register unsigned long r9 __asm__("r9") = ARGVALUE(6); /* First a direct invocation of 'vmcall' */ __asm__ __volatile__("vmcall" : "=a"(rax) : "a"(rax), "D"(rdi), "S"(rsi), "d"(rdx), "r"(r10), "r"(r8), "r"(r9)); GUEST_ASSERT(rax == RETVALUE); /* Fill in the Xen hypercall page */ __asm__ __volatile__("wrmsr" : : "c" (XEN_HYPERCALL_MSR), "a" (HCALL_REGION_GPA & 0xffffffff), "d" (HCALL_REGION_GPA >> 32)); /* Set Hyper-V Guest OS ID */ __asm__ __volatile__("wrmsr" : : "c" (HV_GUEST_OS_ID_MSR), "a" (0x5a), "d" (0)); /* Hyper-V hypercall page */ u64 msrval = HCALL_REGION_GPA + PAGE_SIZE + 1; __asm__ __volatile__("wrmsr" : : "c" (HV_HYPERCALL_MSR), "a" (msrval & 0xffffffff), "d" (msrval >> 32)); /* Invoke a Xen hypercall */ __asm__ __volatile__("call *%1" : "=a"(rax) : "r"(HCALL_REGION_GPA + INPUTVALUE * 32), "a"(rax), "D"(rdi), "S"(rsi), "d"(rdx), "r"(r10), "r"(r8), "r"(r9)); GUEST_ASSERT(rax == RETVALUE); /* Invoke a Hyper-V hypercall */ rax = 0; rcx = HVCALL_SIGNAL_EVENT; /* code */ rdx = 0x5a5a5a5a; /* ingpa (badly aligned) */ __asm__ __volatile__("call *%1" : "=a"(rax) : "r"(HCALL_REGION_GPA + PAGE_SIZE), "a"(rax), "c"(rcx), "d"(rdx), "r"(r8)); GUEST_ASSERT(rax == HV_STATUS_INVALID_ALIGNMENT); GUEST_DONE(); } int main(int argc, char *argv[]) { unsigned int xen_caps; struct kvm_vcpu *vcpu; struct kvm_vm *vm; xen_caps = kvm_check_cap(KVM_CAP_XEN_HVM); TEST_REQUIRE(xen_caps & KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL); vm = vm_create_with_one_vcpu(&vcpu, guest_code); vcpu_set_hv_cpuid(vcpu); struct kvm_xen_hvm_config hvmc = { .flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL, .msr = XEN_HYPERCALL_MSR, }; vm_ioctl(vm, KVM_XEN_HVM_CONFIG, &hvmc); /* Map a region for the hypercall pages */ vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, HCALL_REGION_GPA, HCALL_REGION_SLOT, 2, 0); virt_map(vm, HCALL_REGION_GPA, HCALL_REGION_GPA, 2); for (;;) { volatile struct kvm_run *run = vcpu->run; struct ucall uc; vcpu_run(vcpu); if (run->exit_reason == KVM_EXIT_XEN) { TEST_ASSERT_EQ(run->xen.type, KVM_EXIT_XEN_HCALL); TEST_ASSERT_EQ(run->xen.u.hcall.cpl, 0); TEST_ASSERT_EQ(run->xen.u.hcall.longmode, 1); TEST_ASSERT_EQ(run->xen.u.hcall.input, INPUTVALUE); TEST_ASSERT_EQ(run->xen.u.hcall.params[0], ARGVALUE(1)); TEST_ASSERT_EQ(run->xen.u.hcall.params[1], ARGVALUE(2)); TEST_ASSERT_EQ(run->xen.u.hcall.params[2], ARGVALUE(3)); TEST_ASSERT_EQ(run->xen.u.hcall.params[3], ARGVALUE(4)); TEST_ASSERT_EQ(run->xen.u.hcall.params[4], ARGVALUE(5)); TEST_ASSERT_EQ(run->xen.u.hcall.params[5], ARGVALUE(6)); run->xen.u.hcall.result = RETVALUE; continue; } TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); switch (get_ucall(vcpu, &uc)) { case UCALL_ABORT: REPORT_GUEST_ASSERT(uc); /* NOT REACHED */ case UCALL_SYNC: break; case UCALL_DONE: goto done; default: TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd); } } done: kvm_vm_free(vm); return 0; } |