3f4a812edf
Implement Hyper-V L2 TLB flush for nSVM. The feature needs to be enabled both in extended 'nested controls' in VMCB and VP assist page. According to Hyper-V TLFS, synthetic vmexit to L1 is performed with - HV_SVM_EXITCODE_ENL exit_code. - HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH exit_info_1. Note: VP assist page is cached in 'struct kvm_vcpu_hv' so recalc_intercepts() doesn't need to read from guest's memory. KVM needs to update the case upon each VMRUN and after svm_set_nested_state (svm_get_nested_state_pages()) to handle the case when the guest got migrated while L2 was running. Reviewed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20221101145426.251680-29-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
19 lines
514 B
C
19 lines
514 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AMD SVM specific code for Hyper-V on KVM.
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*
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* Copyright 2022 Red Hat, Inc. and/or its affiliates.
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*/
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#include "hyperv.h"
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void svm_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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svm->vmcb->control.exit_code = HV_SVM_EXITCODE_ENL;
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svm->vmcb->control.exit_code_hi = 0;
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svm->vmcb->control.exit_info_1 = HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH;
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svm->vmcb->control.exit_info_2 = 0;
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nested_svm_vmexit(svm);
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}
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