tools/testing/selftests/kvm/include/x86/svm_util.h

Source file repositories/reference/linux-study-clean/tools/testing/selftests/kvm/include/x86/svm_util.h

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/kvm/include/x86/svm_util.h
Extension
.h
Size
1614 bytes
Lines
72
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct svm_test_data {
	/* VMCB */
	struct vmcb *vmcb; /* gva */
	void *vmcb_hva;
	u64 vmcb_gpa;

	/* host state-save area */
	struct vmcb_save_area *save_area; /* gva */
	void *save_area_hva;
	u64 save_area_gpa;

	/* MSR-Bitmap */
	void *msr; /* gva */
	void *msr_hva;
	u64 msr_gpa;

	/* NPT */
	u64 ncr3_gpa;
};

static inline void vmmcall(void)
{
	/*
	 * Stuff RAX and RCX with "safe" values to make sure L0 doesn't handle
	 * it as a valid hypercall (e.g. Hyper-V L2 TLB flush) as the intended
	 * use of this function is to exit to L1 from L2.  Clobber all other
	 * GPRs as L1 doesn't correctly preserve them during vmexits.
	 */
	__asm__ __volatile__("push %%rbp; vmmcall; pop %%rbp"
			     : : "a"(0xdeadbeef), "c"(0xbeefdead)
			     : "rbx", "rdx", "rsi", "rdi", "r8", "r9",
			       "r10", "r11", "r12", "r13", "r14", "r15");
}

#define stgi()			\
	__asm__ __volatile__(	\
		"stgi\n"	\
		)

#define clgi()			\
	__asm__ __volatile__(	\
		"clgi\n"	\
		)

struct svm_test_data *vcpu_alloc_svm(struct kvm_vm *vm, gva_t *p_svm_gva);
void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp);
void run_guest(struct vmcb *vmcb, u64 vmcb_gpa);

static inline bool kvm_cpu_has_npt(void)
{
	return kvm_cpu_has(X86_FEATURE_NPT);
}
void vm_enable_npt(struct kvm_vm *vm);

int open_sev_dev_path_or_exit(void);

#endif /* SELFTEST_KVM_SVM_UTILS_H */

Annotation

Implementation Notes