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// SPDX-License-Identifier: GPL-2.0-only
/*
* KVM L1 hypervisor optimizations on Hyper-V for SVM.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kvm_host.h>
#include <asm/mshyperv.h>
#include "svm.h"
#include "svm_ops.h"
#include "hyperv.h"
#include "kvm_onhyperv.h"
#include "svm_onhyperv.h"
static int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu)
{
struct hv_vmcb_enlightenments *hve;
hpa_t partition_assist_page = hv_get_partition_assist_page(vcpu);
if (partition_assist_page == INVALID_PAGE)
return -ENOMEM;
hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
hve->partition_assist_page = partition_assist_page;
hve->hv_vm_id = (unsigned long)vcpu->kvm;
if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
hve->hv_enlightenments_control.nested_flush_hypercall = 1;
vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
}
return 0;
}
__init void svm_hv_hardware_setup(void)
{
if (npt_enabled &&
ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");
svm_x86_ops.flush_remote_tlbs = hv_flush_remote_tlbs;
svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_range;
}
if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
int cpu;
pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n");
for_each_online_cpu(cpu) {
struct hv_vp_assist_page *vp_ap =
hv_get_vp_assist_page(cpu);
if (!vp_ap)
continue;
vp_ap->nested_control.features.directhypercall = 1;
}
svm_x86_ops.enable_l2_tlb_flush =
svm_hv_enable_l2_tlb_flush;
}
}
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