tools: rename bitmap_alloc() to bitmap_zalloc()
[linux-2.6-microblaze.git] / tools / testing / selftests / kvm / x86_64 / vmx_dirty_log_test.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * KVM dirty page logging test
4  *
5  * Copyright (C) 2018, Red Hat, Inc.
6  */
7
8 #define _GNU_SOURCE /* for program_invocation_name */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <linux/bitmap.h>
13 #include <linux/bitops.h>
14
15 #include "test_util.h"
16 #include "kvm_util.h"
17 #include "processor.h"
18 #include "vmx.h"
19
20 #define VCPU_ID                         1
21
22 /* The memory slot index to track dirty pages */
23 #define TEST_MEM_SLOT_INDEX             1
24 #define TEST_MEM_PAGES                  3
25
26 /* L1 guest test virtual memory offset */
27 #define GUEST_TEST_MEM                  0xc0000000
28
29 /* L2 guest test virtual memory offset */
30 #define NESTED_TEST_MEM1                0xc0001000
31 #define NESTED_TEST_MEM2                0xc0002000
32
33 static void l2_guest_code(void)
34 {
35         *(volatile uint64_t *)NESTED_TEST_MEM1;
36         *(volatile uint64_t *)NESTED_TEST_MEM1 = 1;
37         GUEST_SYNC(true);
38         GUEST_SYNC(false);
39
40         *(volatile uint64_t *)NESTED_TEST_MEM2 = 1;
41         GUEST_SYNC(true);
42         *(volatile uint64_t *)NESTED_TEST_MEM2 = 1;
43         GUEST_SYNC(true);
44         GUEST_SYNC(false);
45
46         /* Exit to L1 and never come back.  */
47         vmcall();
48 }
49
50 void l1_guest_code(struct vmx_pages *vmx)
51 {
52 #define L2_GUEST_STACK_SIZE 64
53         unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
54
55         GUEST_ASSERT(vmx->vmcs_gpa);
56         GUEST_ASSERT(prepare_for_vmx_operation(vmx));
57         GUEST_ASSERT(load_vmcs(vmx));
58
59         prepare_vmcs(vmx, l2_guest_code,
60                      &l2_guest_stack[L2_GUEST_STACK_SIZE]);
61
62         GUEST_SYNC(false);
63         GUEST_ASSERT(!vmlaunch());
64         GUEST_SYNC(false);
65         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
66         GUEST_DONE();
67 }
68
69 int main(int argc, char *argv[])
70 {
71         vm_vaddr_t vmx_pages_gva = 0;
72         struct vmx_pages *vmx;
73         unsigned long *bmap;
74         uint64_t *host_test_mem;
75
76         struct kvm_vm *vm;
77         struct kvm_run *run;
78         struct ucall uc;
79         bool done = false;
80
81         nested_vmx_check_supported();
82
83         /* Create VM */
84         vm = vm_create_default(VCPU_ID, 0, l1_guest_code);
85         vmx = vcpu_alloc_vmx(vm, &vmx_pages_gva);
86         vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
87         run = vcpu_state(vm, VCPU_ID);
88
89         /* Add an extra memory slot for testing dirty logging */
90         vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
91                                     GUEST_TEST_MEM,
92                                     TEST_MEM_SLOT_INDEX,
93                                     TEST_MEM_PAGES,
94                                     KVM_MEM_LOG_DIRTY_PAGES);
95
96         /*
97          * Add an identity map for GVA range [0xc0000000, 0xc0002000).  This
98          * affects both L1 and L2.  However...
99          */
100         virt_map(vm, GUEST_TEST_MEM, GUEST_TEST_MEM, TEST_MEM_PAGES);
101
102         /*
103          * ... pages in the L2 GPA range [0xc0001000, 0xc0003000) will map to
104          * 0xc0000000.
105          *
106          * Note that prepare_eptp should be called only L1's GPA map is done,
107          * meaning after the last call to virt_map.
108          */
109         prepare_eptp(vmx, vm, 0);
110         nested_map_memslot(vmx, vm, 0);
111         nested_map(vmx, vm, NESTED_TEST_MEM1, GUEST_TEST_MEM, 4096);
112         nested_map(vmx, vm, NESTED_TEST_MEM2, GUEST_TEST_MEM, 4096);
113
114         bmap = bitmap_zalloc(TEST_MEM_PAGES);
115         host_test_mem = addr_gpa2hva(vm, GUEST_TEST_MEM);
116
117         while (!done) {
118                 memset(host_test_mem, 0xaa, TEST_MEM_PAGES * 4096);
119                 _vcpu_run(vm, VCPU_ID);
120                 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
121                             "Unexpected exit reason: %u (%s),\n",
122                             run->exit_reason,
123                             exit_reason_str(run->exit_reason));
124
125                 switch (get_ucall(vm, VCPU_ID, &uc)) {
126                 case UCALL_ABORT:
127                         TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
128                                   __FILE__, uc.args[1]);
129                         /* NOT REACHED */
130                 case UCALL_SYNC:
131                         /*
132                          * The nested guest wrote at offset 0x1000 in the memslot, but the
133                          * dirty bitmap must be filled in according to L1 GPA, not L2.
134                          */
135                         kvm_vm_get_dirty_log(vm, TEST_MEM_SLOT_INDEX, bmap);
136                         if (uc.args[1]) {
137                                 TEST_ASSERT(test_bit(0, bmap), "Page 0 incorrectly reported clean\n");
138                                 TEST_ASSERT(host_test_mem[0] == 1, "Page 0 not written by guest\n");
139                         } else {
140                                 TEST_ASSERT(!test_bit(0, bmap), "Page 0 incorrectly reported dirty\n");
141                                 TEST_ASSERT(host_test_mem[0] == 0xaaaaaaaaaaaaaaaaULL, "Page 0 written by guest\n");
142                         }
143
144                         TEST_ASSERT(!test_bit(1, bmap), "Page 1 incorrectly reported dirty\n");
145                         TEST_ASSERT(host_test_mem[4096 / 8] == 0xaaaaaaaaaaaaaaaaULL, "Page 1 written by guest\n");
146                         TEST_ASSERT(!test_bit(2, bmap), "Page 2 incorrectly reported dirty\n");
147                         TEST_ASSERT(host_test_mem[8192 / 8] == 0xaaaaaaaaaaaaaaaaULL, "Page 2 written by guest\n");
148                         break;
149                 case UCALL_DONE:
150                         done = true;
151                         break;
152                 default:
153                         TEST_FAIL("Unknown ucall %lu", uc.cmd);
154                 }
155         }
156 }