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

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Enable L2 TLB flush feature on nVMX when:
- Enlightened VMCS is in use.
- The feature flag is enabled in eVMCS.
- The feature flag is enabled in partition assist page.

Perform synthetic vmexit to L1 after processing TLB flush call upon
request (HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH).

Note: nested_evmcs_l2_tlb_flush_enabled() uses cached VP assist page copy
which gets updated from nested_vmx_handle_enlightened_vmptrld(). This is
also guaranteed to happen post migration with eVMCS backed L2 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: <20221101145426.251680-27-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 15:54:04 +01:00 • committed by Paolo Bonzini

parent 046f5756c4

commit c30e9bc8b6

4 changed files with 47 additions and 0 deletions

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9

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

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17

arch/x86/kvm/vmx/hyperv.c

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1

arch/x86/kvm/vmx/hyperv.h

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20

arch/x86/kvm/vmx/nested.c

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