1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * tools/testing/selftests/kvm/include/x86_64/svm_utils.h
4 * Header for nested SVM testing
5 *
6 * Copyright (C) 2020, Red Hat, Inc.
7 */
8
9 #ifndef SELFTEST_KVM_SVM_UTILS_H
10 #define SELFTEST_KVM_SVM_UTILS_H
11
12 #include <asm/svm.h>
13
14 #include <stdint.h>
15 #include "svm.h"
16 #include "processor.h"
17
18 struct svm_test_data {
19 /* VMCB */
20 struct vmcb *vmcb; /* gva */
21 void *vmcb_hva;
22 uint64_t vmcb_gpa;
23
24 /* host state-save area */
25 struct vmcb_save_area *save_area; /* gva */
26 void *save_area_hva;
27 uint64_t save_area_gpa;
28
29 /* MSR-Bitmap */
30 void *msr; /* gva */
31 void *msr_hva;
32 uint64_t msr_gpa;
33 };
34
vmmcall(void)35 static inline void vmmcall(void)
36 {
37 /*
38 * Stuff RAX and RCX with "safe" values to make sure L0 doesn't handle
39 * it as a valid hypercall (e.g. Hyper-V L2 TLB flush) as the intended
40 * use of this function is to exit to L1 from L2. Clobber all other
41 * GPRs as L1 doesn't correctly preserve them during vmexits.
42 */
43 __asm__ __volatile__("push %%rbp; vmmcall; pop %%rbp"
44 : : "a"(0xdeadbeef), "c"(0xbeefdead)
45 : "rbx", "rdx", "rsi", "rdi", "r8", "r9",
46 "r10", "r11", "r12", "r13", "r14", "r15");
47 }
48
49 #define stgi() \
50 __asm__ __volatile__( \
51 "stgi\n" \
52 )
53
54 #define clgi() \
55 __asm__ __volatile__( \
56 "clgi\n" \
57 )
58
59 struct svm_test_data *vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva);
60 void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp);
61 void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa);
62
63 int open_sev_dev_path_or_exit(void);
64
65 #endif /* SELFTEST_KVM_SVM_UTILS_H */
66