cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

svm_onhyperv.c (933B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * KVM L1 hypervisor optimizations on Hyper-V for SVM.
      4 */
      5
      6#include <linux/kvm_host.h>
      7
      8#include <asm/mshyperv.h>
      9
     10#include "svm.h"
     11#include "svm_ops.h"
     12
     13#include "hyperv.h"
     14#include "kvm_onhyperv.h"
     15#include "svm_onhyperv.h"
     16
     17int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu)
     18{
     19	struct hv_enlightenments *hve;
     20	struct hv_partition_assist_pg **p_hv_pa_pg =
     21			&to_kvm_hv(vcpu->kvm)->hv_pa_pg;
     22
     23	if (!*p_hv_pa_pg)
     24		*p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL);
     25
     26	if (!*p_hv_pa_pg)
     27		return -ENOMEM;
     28
     29	hve = (struct hv_enlightenments *)to_svm(vcpu)->vmcb->control.reserved_sw;
     30
     31	hve->partition_assist_page = __pa(*p_hv_pa_pg);
     32	hve->hv_vm_id = (unsigned long)vcpu->kvm;
     33	if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
     34		hve->hv_enlightenments_control.nested_flush_hypercall = 1;
     35		vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
     36	}
     37
     38	return 0;
     39}
     40