KVM: nSVM: hyper-v: Enable L2 TLB flush

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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>

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This commit is contained in:

Vitaly Kuznetsov 2022-11-01 15:54:06 +01:00 • committed by Paolo Bonzini

parent b415d8d417

commit 3f4a812edf

5 changed files with 70 additions and 2 deletions

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4

arch/x86/include/asm/hyperv-tlfs.h

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arch/x86/kvm/hyperv.h

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arch/x86/kvm/svm/hyperv.c

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arch/x86/kvm/svm/hyperv.h

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arch/x86/kvm/svm/nested.c

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