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
|
// SPDX-License-Identifier: GPL-2.0-only
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "vmx.h"
#include <string.h>
#include <sys/ioctl.h>
#include "kselftest.h"
#define ARBITRARY_IO_PORT 0x2000
/* The virtual machine object. */
static struct kvm_vm *vm;
static void l2_guest_code(void)
{
asm volatile("inb %%dx, %%al"
: : [port] "d" (ARBITRARY_IO_PORT) : "rax");
}
void l1_guest_code(struct vmx_pages *vmx)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
GUEST_ASSERT(vmx->vmcs_gpa);
GUEST_ASSERT(prepare_for_vmx_operation(vmx));
GUEST_ASSERT(load_vmcs(vmx));
prepare_vmcs(vmx, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
GUEST_ASSERT(!vmlaunch());
/* L2 should triple fault after a triple fault event injected. */
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_TRIPLE_FAULT);
GUEST_DONE();
}
int main(void)
{
struct kvm_vcpu *vcpu;
struct kvm_run *run;
struct kvm_vcpu_events events;
vm_vaddr_t vmx_pages_gva;
struct ucall uc;
if (!nested_vmx_supported()) {
print_skip("Nested VMX not supported");
exit(KSFT_SKIP);
}
if (!kvm_has_cap(KVM_CAP_X86_TRIPLE_FAULT_EVENT)) {
print_skip("KVM_CAP_X86_TRIPLE_FAULT_EVENT not supported");
exit(KSFT_SKIP);
}
vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
vm_enable_cap(vm, KVM_CAP_X86_TRIPLE_FAULT_EVENT, 1);
run = vcpu->run;
vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vcpu, 1, vmx_pages_gva);
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Expected KVM_EXIT_IO, got: %u (%s)\n",
run->exit_reason, exit_reason_str(run->exit_reason));
TEST_ASSERT(run->io.port == ARBITRARY_IO_PORT,
"Expected IN from port %d from L2, got port %d",
ARBITRARY_IO_PORT, run->io.port);
vcpu_events_get(vcpu, &events);
events.flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT;
events.triple_fault.pending = true;
vcpu_events_set(vcpu, &events);
run->immediate_exit = true;
vcpu_run_complete_io(vcpu);
vcpu_events_get(vcpu, &events);
TEST_ASSERT(events.flags & KVM_VCPUEVENT_VALID_TRIPLE_FAULT,
"Triple fault event invalid");
TEST_ASSERT(events.triple_fault.pending,
"No triple fault pending");
vcpu_run(vcpu);
switch (get_ucall(vcpu, &uc)) {
case UCALL_DONE:
break;
case UCALL_ABORT:
TEST_FAIL("%s", (const char *)uc.args[0]);
default:
TEST_FAIL("Unexpected ucall: %lu", uc.cmd);
}
}
|
