1
2
3
4
5
6
7
8
9
10#include "test_util.h"
11#include "kvm_util.h"
12#include "../kvm_util_internal.h"
13#include "processor.h"
14#include "svm_util.h"
15
16struct gpr64_regs guest_regs;
17u64 rflags;
18
19
20
21
22
23
24
25
26
27
28
29
30struct svm_test_data *
31vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva)
32{
33 vm_vaddr_t svm_gva = vm_vaddr_alloc(vm, getpagesize(),
34 0x10000, 0, 0);
35 struct svm_test_data *svm = addr_gva2hva(vm, svm_gva);
36
37 svm->vmcb = (void *)vm_vaddr_alloc(vm, getpagesize(),
38 0x10000, 0, 0);
39 svm->vmcb_hva = addr_gva2hva(vm, (uintptr_t)svm->vmcb);
40 svm->vmcb_gpa = addr_gva2gpa(vm, (uintptr_t)svm->vmcb);
41
42 svm->save_area = (void *)vm_vaddr_alloc(vm, getpagesize(),
43 0x10000, 0, 0);
44 svm->save_area_hva = addr_gva2hva(vm, (uintptr_t)svm->save_area);
45 svm->save_area_gpa = addr_gva2gpa(vm, (uintptr_t)svm->save_area);
46
47 *p_svm_gva = svm_gva;
48 return svm;
49}
50
51static void vmcb_set_seg(struct vmcb_seg *seg, u16 selector,
52 u64 base, u32 limit, u32 attr)
53{
54 seg->selector = selector;
55 seg->attrib = attr;
56 seg->limit = limit;
57 seg->base = base;
58}
59
60void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp)
61{
62 struct vmcb *vmcb = svm->vmcb;
63 uint64_t vmcb_gpa = svm->vmcb_gpa;
64 struct vmcb_save_area *save = &vmcb->save;
65 struct vmcb_control_area *ctrl = &vmcb->control;
66 u32 data_seg_attr = 3 | SVM_SELECTOR_S_MASK | SVM_SELECTOR_P_MASK
67 | SVM_SELECTOR_DB_MASK | SVM_SELECTOR_G_MASK;
68 u32 code_seg_attr = 9 | SVM_SELECTOR_S_MASK | SVM_SELECTOR_P_MASK
69 | SVM_SELECTOR_L_MASK | SVM_SELECTOR_G_MASK;
70 uint64_t efer;
71
72 efer = rdmsr(MSR_EFER);
73 wrmsr(MSR_EFER, efer | EFER_SVME);
74 wrmsr(MSR_VM_HSAVE_PA, svm->save_area_gpa);
75
76 memset(vmcb, 0, sizeof(*vmcb));
77 asm volatile ("vmsave\n\t" : : "a" (vmcb_gpa) : "memory");
78 vmcb_set_seg(&save->es, get_es(), 0, -1U, data_seg_attr);
79 vmcb_set_seg(&save->cs, get_cs(), 0, -1U, code_seg_attr);
80 vmcb_set_seg(&save->ss, get_ss(), 0, -1U, data_seg_attr);
81 vmcb_set_seg(&save->ds, get_ds(), 0, -1U, data_seg_attr);
82 vmcb_set_seg(&save->gdtr, 0, get_gdt().address, get_gdt().size, 0);
83 vmcb_set_seg(&save->idtr, 0, get_idt().address, get_idt().size, 0);
84
85 ctrl->asid = 1;
86 save->cpl = 0;
87 save->efer = rdmsr(MSR_EFER);
88 asm volatile ("mov %%cr4, %0" : "=r"(save->cr4) : : "memory");
89 asm volatile ("mov %%cr3, %0" : "=r"(save->cr3) : : "memory");
90 asm volatile ("mov %%cr0, %0" : "=r"(save->cr0) : : "memory");
91 asm volatile ("mov %%dr7, %0" : "=r"(save->dr7) : : "memory");
92 asm volatile ("mov %%dr6, %0" : "=r"(save->dr6) : : "memory");
93 asm volatile ("mov %%cr2, %0" : "=r"(save->cr2) : : "memory");
94 save->g_pat = rdmsr(MSR_IA32_CR_PAT);
95 save->dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
96 ctrl->intercept = (1ULL << INTERCEPT_VMRUN) |
97 (1ULL << INTERCEPT_VMMCALL);
98
99 vmcb->save.rip = (u64)guest_rip;
100 vmcb->save.rsp = (u64)guest_rsp;
101 guest_regs.rdi = (u64)svm;
102}
103
104
105
106
107
108#define SAVE_GPR_C \
109 "xchg %%rbx, guest_regs+0x20\n\t" \
110 "xchg %%rcx, guest_regs+0x10\n\t" \
111 "xchg %%rdx, guest_regs+0x18\n\t" \
112 "xchg %%rbp, guest_regs+0x30\n\t" \
113 "xchg %%rsi, guest_regs+0x38\n\t" \
114 "xchg %%rdi, guest_regs+0x40\n\t" \
115 "xchg %%r8, guest_regs+0x48\n\t" \
116 "xchg %%r9, guest_regs+0x50\n\t" \
117 "xchg %%r10, guest_regs+0x58\n\t" \
118 "xchg %%r11, guest_regs+0x60\n\t" \
119 "xchg %%r12, guest_regs+0x68\n\t" \
120 "xchg %%r13, guest_regs+0x70\n\t" \
121 "xchg %%r14, guest_regs+0x78\n\t" \
122 "xchg %%r15, guest_regs+0x80\n\t"
123
124#define LOAD_GPR_C SAVE_GPR_C
125
126
127
128
129
130
131void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa)
132{
133 asm volatile (
134 "vmload\n\t"
135 "mov rflags, %%r15\n\t"
136 "mov %%r15, 0x170(%[vmcb])\n\t"
137 "mov guest_regs, %%r15\n\t"
138 "mov %%r15, 0x1f8(%[vmcb])\n\t"
139 LOAD_GPR_C
140 "vmrun\n\t"
141 SAVE_GPR_C
142 "mov 0x170(%[vmcb]), %%r15\n\t"
143 "mov %%r15, rflags\n\t"
144 "mov 0x1f8(%[vmcb]), %%r15\n\t"
145 "mov %%r15, guest_regs\n\t"
146 "vmsave\n\t"
147 : : [vmcb] "r" (vmcb), [vmcb_gpa] "a" (vmcb_gpa)
148 : "r15", "memory");
149}
150
151bool nested_svm_supported(void)
152{
153 struct kvm_cpuid_entry2 *entry =
154 kvm_get_supported_cpuid_entry(0x80000001);
155
156 return entry->ecx & CPUID_SVM;
157}
158
159void nested_svm_check_supported(void)
160{
161 if (!nested_svm_supported()) {
162 print_skip("nested SVM not enabled");
163 exit(KSFT_SKIP);
164 }
165}
166