arch/x86/kvm/vmx/hyperv_evmcs.h

Source file repositories/reference/linux-study-clean/arch/x86/kvm/vmx/hyperv_evmcs.h

File Facts

System
Linux kernel
Corpus path
arch/x86/kvm/vmx/hyperv_evmcs.h
Extension
.h
Size
5249 bytes
Lines
168
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct evmcs_field {
	u16 offset;
	u16 clean_field;
};

extern const struct evmcs_field vmcs_field_to_evmcs_1[];
extern const unsigned int nr_evmcs_1_fields;

static __always_inline int evmcs_field_offset(unsigned long field,
					      u16 *clean_field)
{
	const struct evmcs_field *evmcs_field;
	unsigned int index = ENC_TO_VMCS12_IDX(field);

	if (unlikely(index >= nr_evmcs_1_fields))
		return -ENOENT;

	evmcs_field = &vmcs_field_to_evmcs_1[index];

	/*
	 * Use offset=0 to detect holes in eVMCS. This offset belongs to
	 * 'revision_id' but this field has no encoding and is supposed to
	 * be accessed directly.
	 */
	if (unlikely(!evmcs_field->offset))
		return -ENOENT;

	if (clean_field)
		*clean_field = evmcs_field->clean_field;

	return evmcs_field->offset;
}

static inline u64 evmcs_read_any(struct hv_enlightened_vmcs *evmcs,
				 unsigned long field, u16 offset)
{
	/*
	 * vmcs12_read_any() doesn't care whether the supplied structure
	 * is 'struct vmcs12' or 'struct hv_enlightened_vmcs' as it takes
	 * the exact offset of the required field, use it for convenience
	 * here.
	 */
	return vmcs12_read_any((void *)evmcs, field, offset);
}

#endif /* __KVM_X86_VMX_HYPERV_H */

Annotation

Implementation Notes