tools/testing/selftests/kvm/lib/x86/hyperv.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/kvm/lib/x86/hyperv.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/kvm/lib/x86/hyperv.c
Extension
.c
Size
3098 bytes
Lines
114
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

if (!cpuid_full) {
			perror("malloc");
			abort();
		}

		/* Need to skip KVM CPUID leaves 0x400000xx */
		for (i = 0; i < cpuid_sys->nent; i++) {
			if (cpuid_sys->entries[i].function >= 0x40000000 &&
			    cpuid_sys->entries[i].function < 0x40000100)
				continue;
			cpuid_full->entries[nent] = cpuid_sys->entries[i];
			nent++;
		}

		memcpy(&cpuid_full->entries[nent], cpuid_hv->entries,
		       cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2));
		cpuid_full->nent = nent + cpuid_hv->nent;
	}

	vcpu_init_cpuid(vcpu, cpuid_full);
}

const struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vcpu *vcpu)
{
	struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);

	vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, cpuid);

	return cpuid;
}

bool kvm_hv_cpu_has(struct kvm_x86_cpu_feature feature)
{
	if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID))
		return false;

	return kvm_cpuid_has(kvm_get_supported_hv_cpuid(), feature);
}

struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm,
						       gva_t *p_hv_pages_gva)
{
	gva_t hv_pages_gva = vm_alloc_page(vm);
	struct hyperv_test_pages *hv = addr_gva2hva(vm, hv_pages_gva);

	/* Setup of a region of guest memory for the VP Assist page. */
	hv->vp_assist = (void *)vm_alloc_page(vm);
	hv->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->vp_assist);
	hv->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->vp_assist);

	/* Setup of a region of guest memory for the partition assist page. */
	hv->partition_assist = (void *)vm_alloc_page(vm);
	hv->partition_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->partition_assist);
	hv->partition_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->partition_assist);

	/* Setup of a region of guest memory for the enlightened VMCS. */
	hv->enlightened_vmcs = (void *)vm_alloc_page(vm);
	hv->enlightened_vmcs_hva = addr_gva2hva(vm, (uintptr_t)hv->enlightened_vmcs);
	hv->enlightened_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)hv->enlightened_vmcs);

	*p_hv_pages_gva = hv_pages_gva;
	return hv;
}

int enable_vp_assist(u64 vp_assist_pa, void *vp_assist)
{
	u64 val = (vp_assist_pa & HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK) |
		HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;

	wrmsr(HV_X64_MSR_VP_ASSIST_PAGE, val);

	current_vp_assist = vp_assist;

	return 0;
}

Annotation

Implementation Notes