svm_onhyperv.c

 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
18static int 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
38__init void svm_hv_hardware_setup(void)
39{
40	if (npt_enabled &&
41	    ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
42		pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");
43		svm_x86_ops.flush_remote_tlbs = hv_flush_remote_tlbs;
44		svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_range;
45	}
46
47	if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
48		int cpu;
49
50		pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n");
51		for_each_online_cpu(cpu) {
52			struct hv_vp_assist_page *vp_ap =
53				hv_get_vp_assist_page(cpu);
54
55			if (!vp_ap)
56				continue;
57
58			vp_ap->nested_control.features.directhypercall = 1;
59		}
60		svm_x86_ops.enable_l2_tlb_flush =
61				svm_hv_enable_l2_tlb_flush;
62	}
63}