1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * KVM L1 hypervisor optimizations on Hyper-V for SVM.
 4 */
 5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 6
 7#include <linux/kvm_host.h>
 8
 9#include <asm/mshyperv.h>
10
11#include "svm.h"
12#include "svm_ops.h"
13
14#include "hyperv.h"
15#include "kvm_onhyperv.h"
16#include "svm_onhyperv.h"
17
18int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu)
19{
20	struct hv_vmcb_enlightenments *hve;
21	hpa_t partition_assist_page = hv_get_partition_assist_page(vcpu);
22
23	if (partition_assist_page == INVALID_PAGE)
24		return -ENOMEM;
25
26	hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
27
28	hve->partition_assist_page = partition_assist_page;
29	hve->hv_vm_id = (unsigned long)vcpu->kvm;
30	if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
31		hve->hv_enlightenments_control.nested_flush_hypercall = 1;
32		vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
33	}
34
35	return 0;
36}
37