1183646a67
From Hyper-V TLFS:
"The hypervisor exposes hypercalls (HvFlushVirtualAddressSpace,
HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressList, and
HvFlushVirtualAddressListEx) that allow operating systems to more
efficiently manage the virtual TLB. The L1 hypervisor can choose to
allow its guest to use those hypercalls and delegate the responsibility
to handle them to the L0 hypervisor. This requires the use of a
partition assist page."
Add the Direct Virtual Flush support for SVM.
Related VMX changes:
commit 6f6a657c9998 ("KVM/Hyper-V/VMX: Add direct tlb flush support")
Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
Message-Id: <fc8d24d8eb7017266bb961e39a171b0caf298d7f.1622730232.git.viremana@linux.microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
42 lines
961 B
C
42 lines
961 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* KVM L1 hypervisor optimizations on Hyper-V for SVM.
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*/
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#include <linux/kvm_host.h>
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#include "kvm_cache_regs.h"
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#include <asm/mshyperv.h>
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#include "svm.h"
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#include "svm_ops.h"
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#include "hyperv.h"
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#include "kvm_onhyperv.h"
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#include "svm_onhyperv.h"
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int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu)
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{
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struct hv_enlightenments *hve;
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struct hv_partition_assist_pg **p_hv_pa_pg =
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&to_kvm_hv(vcpu->kvm)->hv_pa_pg;
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if (!*p_hv_pa_pg)
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*p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL);
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if (!*p_hv_pa_pg)
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return -ENOMEM;
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hve = (struct hv_enlightenments *)to_svm(vcpu)->vmcb->control.reserved_sw;
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hve->partition_assist_page = __pa(*p_hv_pa_pg);
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hve->hv_vm_id = (unsigned long)vcpu->kvm;
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if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
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hve->hv_enlightenments_control.nested_flush_hypercall = 1;
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vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
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}
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return 0;
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}
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