svm_util.h

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